3 Int. Conference On Buckling And Postbuckling Behaviour Of Composite .
3rd Int. Conference onBuckling and PostbucklingBehaviour of CompositeLaminated Shell StructureswithDESICOS1 Workshop25-27 March 2015Organiser:Conference Place:DLR (German Aerospace Center),Institute of Composite Structures andAdaptive Systems, Braunschweig, GermanyTechnical University of Braunschweig,Pockelsstrasse 4, Braunschweig, Germanywww.desicos.eu1 DESICOS is a running EU project and stands for:New Robust DESIgn Guideline for ImperfectionSensitive COmposite Launcher StructuresINICOPINstitute for InternationalCO-oPeration e.V.
-2-Table of ContentsKeynote speakers3Aim of the conference and workshop4EU project DESICOS5Committee, publications6List of presentations7Conference programme - overview sessions10Conference programme11Conference dinner, 25 March 2015 – Agenda16DESICOS workshop - 26 March 2015 – Exhibitors17DLR – Technical visiting tour, 26 March 2015 – Agenda21List of abstracts22Map - Braunschweig (location conference, hotels, dinner, DLR)67Map - University68Conference building - room plan69Conference sponsors70
-3-Keynote speakers1) Prof. Hansjörg Dittus (DLR, Member of executive board, responsible for space)Reusability – DLR s new R&D-programme for launch technologies2) Prof. JN Reddy (Texas AM University)Refined theories and finite element models for the analysis of laminated compositestructures: An overview3) Dr. Mark Hilburger (NASA, Senior researcher)Recent Developments in the Analysis and Testing of Large-Scale Buckling-CriticalCylinders4) Dr. Jochen Albus (Airbus, Senior expert)Parametric Instability of Pressurized Propellant Tanks5) Dr. Peter Linde (Airbus)Structural Modelling and Simulation of Aircraft Composite Structures; State of theIndustry6) Prof. Andreas Rittweger (DLR, Head of the Institute of Space Systems)Pre-Dimensioning of Launch Vehicles due to Booster Load Introduction based onSemi-Analytical Methods7) Prof. Jan Blachut (University of Liverpool)Composite spheroidal shells under external pressure8) Prof. Brian Falzon (Royal Academy of Engineering - Bombardier Chair inAerospace Composites, Queen’s University Belfast)Modelling damage in thin-walled composite structures9) Prof. Christian Hühne (DLR, Institute of Composite Structures and AdaptiveSystems, Head of department Composite Design)Single perturbation load approach – From the initial idea until today10) Dr. habil. Christian Mittelstedt (SOGETI High Tech GmbH, Hamburg)Recent developments in the rapid and efficient closed-form analytical modeling ofbuckling problems in composite lightweight engineering11) Dr. Tobias Wille (DLR, Institute of Composite Structures and Adaptive Systems,Head of department Structural Mechanics)Challenges in Structural Mechanics of Composite Structures12) Prof. Ralf Cuntze (retired)Reliable strength design verification - Fundamentals, requirements and some hints13) Dr. John Hart-Smith (retired)The use of simple strain-energy concepts to debunk the classical thin-shell bucklinganalyses for once and for all
-4-Aim of the conference and workshopConference and workshop are primarily organised as the final events of the running EUproject DESICOS demonstrating its results. The scientific community and industry ingeneral are invited to attend. Both events aim to promote discussion and exchange ofinformation between scientists and engineers in the field of buckling, postbuckling andcollapse behaviour of composite structures.The conference aims at presenting scientific achievements from the DESICOS project. Inaddition, papers with recent results on the same topic but from outside the project are aswell accepted.Within the workshop new software related to improved simulation of composites,improved design tools or test structures developed within DESICOS but also outside theproject, are presented and demonstrated.HistoryThe present conference follows the two conferences from the past:1st Int. Conference on Buckling and Postbuckling Behaviour of Composite LaminatedShell Structures Eilat, Israel, 1-2 March 2004, demonstrating results from the EU projectPOSICOSS, www.cocomat.de.2nd Int. Conference on Buckling and Postbuckling Behaviour of Composite LaminatedShell Structures Braunschweig, Germany, 5-7 September 2008, demonstrating resultsfrom the EU project COCOMAT, www.cocomat.de.TopicsNew achievements in the following topics of buckling, postbuckling and collapsebehaviour of composite laminated shell structures are presented: Influence of imperfectionsExperimental methods and resultsDesign guidelinesAdvanced finite element tools for certificationFast design toolsDegradation modelsFailure criteriaStructural optimisationAll topics shall focus on various Composite Laminated Shell Structures under differentstates of loading.
-5-EU project DESICOSThe running EU project DESICOS (New Robust DESIgn Guideline for ImperfectionSensitive COmposite Launcher Structures) is a Level 1 Project within the 7th FrameworkProgramme. It started February 2012 and will be finished in July 2015.DESICOS aims to exploit considerable reserves in the capacities of imperfection sensitivecomposite launcher structures by applying the Single Perturbation Load Approach(SPLA), which assumes that a large enough disturbing load leads to the worst realisticgeometric imperfection, combined with a Specific Stochastic Approach to take intoaccount load imperfection, thick-ness imperfection, etc. Currently, imperfection sensitiveshell structures prone to buckling are designed according to the NASA SP 8007 guidelineusing the conservative lower bound curve. The guideline dates from 1968, and thestructural behaviour of composite material is not considered appropriately, in particularsince the imperfection sensitivity and the buckling load of shells made from suchmaterials depend on the lay-up design. NASA SP 8007 design guidelines allows designingonly so called "black metal" structures. Therefore there is a high need for a new preciseand fast design and testing approach.The project results comprise an experimental data base, new design approaches forimperfection sensitive structures and new design recommendations.More details can be found at www.desicos.eu.Current design scenario:(NASA SP 8007)Future design scenario:Single Perturbation LoadApproach (SPLA) StochasticApproachDESICOS25line (a)FN0 0Pperfectline (b)BucklingBucklingF N (kN)Bucklingload load[F]load20line urbation loadload(F)(N)810Pdesign Pperfect * ρ1 * ρ2Pdesign Pperfect * ρNASAρNASA Knock down factor NASA SP-80072ρ 1 Knock down factor SPLAρ 2 Knock down factor Stochastic Approach Depends only on radius and thickness Potential of composite material can not beconsidered appropriately Approach applicable to any material Potential of composites fully exploited
-6-CommitteesChairmanProf. Richard Degenhardt, DLR, Braunschweig, D and PFH Göttingen, DE-mail: richard.degenhardt@dlr.deMobile phone: 49 162 269 2474Conference SecretariatE-mail: desicos@dlr.deTechnical and Scientific CommitteeMrs. Paula Mota Alves, EC, Brussels, BProf. Richard Degenhardt, DLR, Braunschweig, DProf. Klaus Rohwer, DLR, Braunschweig, DProf. Andreas Rittweger, DLR, DDr Rolf Zimmermann, DLR, Braunschweig, DProf. Zafer Gürdal, Skoltech, RussiaProf. Mostafa M. Abdalla, TU-Delft, NLDr Martin Ruess, TU-Delft, NLProf. Eelco Jansen, Leibniz University, Hannover, DProf. Raimund Rolfes, Leibniz University, Hannover, DProf. Murray Scott, CRC-ACS, Melbourne, AUSProf. Ganga Prusty, CRC-ACS, Melbourne, AUSDr Rodney Thomson, CRC-ACS, Melbourne, AUSProf. Chiara Bisagni, TU-Delft, Delft, NLDr Kaspars Kalnins, RTU, Riga, LatviaProf. Hans-G. Reimerdes, RWTH, Aachen, DProf. Haim Abramovich, TECHNION, Haifa, ILMr. Patrice Blanchard, ASTRIUM-F, FMr. Jesus Gomez, ASTRIUM-D, DDr. Jochen Albus, ASTRIUM-D, DMr. Avi Wieder, GRIPHUS, Haifa, ILPublicationsConference handout:Will contain all short abstracts giving an overviewConference CD:Will contain all extended abstractsSpecial issueSelected presentations of high quality will be published in a specialissue of the Int. Journal of Structural Stability and Dynamics.
ESICOS partnersKeynote speakersList of GermanyHansjörg Dittus (DLR, Member of executiveboard, responsible for space)Ralf CuntzeA03USAMark Hilburger (NASA, Senior researcher)A04GermanyA05GermanyA06USAAndreas Rittweger (DLR, Head of Institute ofSpace Systems)Christian Hühne (DLR, Head of departmentComposite Design)JN Reddy (Texas AM University, USA)A07GermanyPeter Linde (Airbus)A08AustraliaJohn Hart-SmithA09GermanyA10GermanyTobias Wille (DLR, Head of departmentStructural mechanics)Christian Mittelstedt (Sogeti)A11A12A13UKGermanyUKReusability – DLR s new R&D-programme for launchtechnologiesReliable strength design verification - Fundamentals,requirements and some hintsSubscale and Full-Scale Testing of Buckling-CriticalLaunch Vehicle StructuresPre-Dimensioning of Launch Vehicles due to BoosterLoad Introduction based on Semi-Analytical MethodsSingle perturbation load approach – From the initial ideauntil todayRefined theories and finite element models for theanalysis of laminated composite structures: An overviewStructural Modelling and Simulation of AircraftComposite Structures; State of the IndustryThe use of simple strain-energy concepts to debunk theclassical thin-shell buckling analyses for once and for allChallenges in Structural Mechanics of CompositeStructuresRecent developments in the rapid and efficient closedform analytical modeling of buckling problems incomposite lightweight engineeringComposite spheroidal shells under external pressureParametric Instability of Pressurized Propellant TanksModelling damage in thin-walled composite structuresB01GermanyB02GermanyR. Khakimova, R. Degenhardt (DLR)B03GermanyR. Wagner, C. Hühne (DLR)B04GermanyD. Degenhardt, M. Hilburger, S. Castro, R.Khakimova, R. Degenhardt (DLR, NASA,Embraer, PFH)B05GermanyC. Wolff, D.Wilckens (DLR)B06GermanyD. Wilckens, F. Odermann (DLR)B07GermanyS. Freund, A. Sauerbrei, R. Zimmermann(DLR)B08GermanyF. Odermann, M. Geier (DLR)B09GermanyF. da Cunha, T. Wille, R. Degenhardt, M.Sinapius (DLR)B10GermanyR. Degenhardt (DLR, PFH)Jan Blachut (University of Liverpool)Jochen Albus (Airbus, Senior expert)Brian Falzon (Royal Academy of Engineering Bombardier Chair in Aerospace Composites,Queen’s University Belfast)R. Khakimova, S. Castro, R. Degenhardt, D.Wilckens, M. Kepke, B. Hildebrandt, F.Odermann (DLR, PFH)Buckling experiments on imperfection sensitive thinwalled structures using additional perturbation loadsAssessment of the Single Perturbation Load Approach oncomposite conical shellsNumerical investigation on experimental buckling loadsof unstiffened cylindrical composite shells with varyingratio of radius/wall thicknessBuckling studies under non-uniform loadingTesting and Modelling of impact damaged orthotropicstiffened CFRP-PanelsBuckling and Post Buckling of Stiffened CFRP Panelsunder Compression and ShearMultilevel Skin Buckling Analysis using HierarchicalMetamodelsBuckling tests of unstiffened cylindrical composite shellsunder dynamic axial pulse loadingStructural Robustness Assessment of Thin-WalledComposite Structures in the Postbuckling RegimeNew Robust Design Guideline for Imperfection SensitiveComposite Launcher Structures - The DESICOS projectB11AustraliaB12GermanyB13FranceJ. Kepple, M. Herath, G. Pearce, G. Prusty, R.Thomson (CRC-ACS, University of NewSouth Wales, Advanced Composite StructuresAustralia)S. Castro, R. Khakimova , G. Ziegmann, D.Degenhardt, R. Degenhardt, Mark Hilburger(PFH, DLR, TU Clausthal, Sogeti, NASA)P. Blanchard (Airbus)B14ItalyC. Bisagni (Politecnico di Milano)Overview of FP7 Project DAEDALOS - Dynamics inAircraft Engineering Design and Analysis for LightOptimized StructuresB15NetherlandsK. Liang, M. Ruess (TU-Delft)New robust knock-down factors for the stiffened cylinderStochastic analysis of imperfection sensitive compositecylinders using realistic imperfection modelsSimulation of geometric imperfections and uneven edgesin thin-walled cylindersWP 5 Contribution to improved design guidelines
Other speakersDESICOS partners-8-NoCountryAuthorsTitleB16NetherlandsM. Ruess (TU-Delft)WP 3 Development of new design methodsB17GermanyB18GermanyE.L. Jansen, T. Rahman, R. Rolfes (Uni.Hannover, TNO DIANA BV)A. Meurer, M. Dannert, R. Rolfes (LeibnizUniversity Hannover)B19GermanyE. Jansen, H. Abramovich, R. Rolfes (LeibnizUniversity Hannover, TECHNION)B20GermanyS. G. P. Castro, C. Mittelstedt, F. A. C .Monteiro,M. A. Arbelo , R. Degenhardt, G. Ziegmann(PFH, DLR, TU Clausthal. Sogeti)Towards mode selection criteria for multi-mode initialpostbuckling analysis of composite cylindrical shellsNew Design Approach for Axially Compressed CompositeCylindrical Shells combining the Single Perturbation LoadApproach and Probabilistic AnalysesImproving the vibration correlation technique for shells usinganalysis toolsA semi-analytical approach for linear and non-linear analysisof unstiffened laminated composite cylinders and conesunder axial, torsion and pressure loads (PFH, DLR, TUClausthal, Sogeti)B21GermanyB22GermanyB23BrazilM. Arbelo,K. Kalnins,O. Ozoliņš,S. Castro,R.Degenhardt (ITA, RTU, DLR)B24ItalyC. Bisagni (Politecnico di Milano)B25ItalyM. Alfano, C. Bisagni (Politecnico di Milano)B26B27LatviaK. Kalnins (Riga Technical University)B28LatviaK. Kalnins, E. Skukis, O. Ozolins, M. A. Arbelo(RTU, C02GreeceC03GermanyC. Schillo, D. Krause (TU Hamburg Harburg)C04GermanyT.Ungwattanapanit, H. Baier (TU Munich)C05RussiaC06UKC07IranH. Assaee (Shiraz University of Technology)C08GermanyT. A. Schmid Fuertes, H.-G. Reimerdes (Airbus,RWTH Aachen)C09FranceP. Le Grognec, K. Sad Saoud (Mines Douai)C10USA,ItalyE. J. Barbero, A. Madeo, G. Zagari, R. Zinno, G.Zucco (West Virginia University, University ofCalabria)C11DenmarkS. R. Henrichsen, E. Lindgaard, E. Lund(Aalborg University)C12GermanyA. Köllner, C. Völlmecke (TU-Berlin)S. G. P. Castro, R. Zimmermann, C. Mittelstedt,M. A. Arbelo , R. Khakimova, M. W. Hilburger,R. Degenhardt (PFH, Embraer, DLR, NASA)S. G. P. Castro, M. A. Arbelo , R. Degenhardt, G.Ziegmann (PFH, DLR, TU Clausthal. Sogeti)L. Friedrich, A. Dafnis, H. Reimerdes, K.Schröder (RWTH Aachen)L. Friedrich, H. Reimerdes, K. Schröder (RWTHAachen)H. Abramovich, D. Govich and A. Grunwald(TECHNION)H. Abramovich (Technion)M. A. Castillo-Acero, C. Cuerno-Rejado, M. A.Gómez-Tierno (Aernnova, UPM)V. K. Mantzaroudis, D.G. Stamatelos (HellenicAir Force Academy)T. Le-Manh, Z. Gurdal, M. Abdalla (Skoltech,TU-Delft)A. Al-Azzawi, J. McCrory, L.F. Kawashita, C.A.Featherston, R. Pullin and K. M. Holford (Cardiffuniversity)Non-linear buckling response of unstiffened laminatedcomposite cylinders using different geometric imperfectionsSingle perturbation load approach: new definition for P1 andexplaining the constancy of the buckling loadBuckling of imperfection sensitive shell structures:experimental characterization of the knock-down factor usingthe Multiple Perturbation Load ApproachWP 2 - Material characterization and design of structures forbuckling testsReliability assessment of buckling response of axiallycompressed sandwich composite shells with and without cutoutsWP 1 BenchmarkingExperimental determination of the buckling load ofcomposite cylindrical shells using Vibration CorrelationTechniqueInfluence of load application on the collapse load ofimperfection sensitive shell structuresAdvanced sizing strategies for preliminary design oforthotropic grid stiffened shell structuresCurved panels buckling prediction using the VibrationCorrelation TechniqueWP 4 - Manufacturing and buckling testsHighly Orthotropic Panels Structural Stability, Farrar andBloch Waves TheoryClosed-form local skin buckling solution for orthotropic andanisotropic stiffened panels braced with omega stringersExperimental and numerical study regarding the influence oftraditional and non-traditional imperfections on the bucklingload of unstiffened cylindrical CFRP shellsWeight optimization using equivalent static loads ofpostbuckled, stiffened panels made by steered-fiber laminatesNonlinear buckling of tapered composite plates inisogeometric analysis frameworkBuckling and postbuckling behaviour of glare laminatescontaining splices and doublers: experimental and numericalinvestigationsApplication of different versions of finite strip Method asfast tools for buckling analysis of Composite stiffened shellsBuckling and post-buckling analyses of circular compositecylinders under axial compression using a semi-analyticalapproachAnalytical and numerical analysis of the elastic/plastic local/global buckling and postbuckling of composite structuresImperfection sensitivity analysis of composite cylindricalshells using Koiter’s methodDiscrete material buckling optimization of laminatedcomposite structures considering “worst” shapeimperfectionsBuckling and post-buckling behaviour of delaminatedcomposite struts
Other speakers-9-NoCountryAuthorsC13USAM. Schultz, L. Oremont, M. Hilburger (NASA)C14UK, ChinaJ. Croll, M. Wang (Uni. College London, ChinaUni. of Petroleum)C15PolandL. Czechowski (Lodz University of Technology)C16PolandT. Kubiak (Lodz University of IndiaC28SwitzerlandC29SloveniaC30PolandR. J. Mania (Lodz University of Technology)C31ChinaZhang Guofan, Sun Xiasheng (ASRI)C32GermanyT. Kühn, H. Pasternak, C. Mittelstedt (EADSEFW, TU Cottbus, Sogeti)C33GermanyA. Baucke, C. Mittelstedt (HAW, Sogeti)C34PolandC35PolandC36AustriaB. Goller, H. Haller (INTALES)C37IndiaAditi Sharma (Rajalakshmi Engineering College)C38SwitzerlandL. Thomas, S. Merazzi (SMR)C39JapanA.Takano (Kanagawa University)C40GermanyM. Klein (GOM)A. Gliszczynski, T. Kubiak (Lodz University ofTechnology)K.C. Gopalakrishnan, R. Ramesh Kumar(Government Engineering College, CET andGEC Barton Hill, Thriruvananthpuram)A. Watson, B. Wang, S. Wang, C. Harvey(Loughborough University)M.J. Weber, P. Middendorf (Airbus, TUStuttgart)P. Weaver (University of Bristol)J.P. Delsemme, M. Bruyneel, Ph. Jetteur, B.Magneville, T. Naito, Y. Urushiyama(SAMTECH, Honda)V.M.Trach, N.P.Semenyuk, A.V.Podvornyi,N.B.Zhukova (National University of WaterManagement and Nature Resources Use,Timoshenko Institute)John-Hart SmithZia R. Tahir, P. Mandal (University ofManchester)M. Brojan, D. Terwagne, R. Lagrange, P. Reis(Uni. of Ljubljana, ULB, MIT)T. Rajanna, Sauvik Banerjee, Yogesh M. Desai,D.L. Prabhakara (Indian Institute of Technology)Sahyadri College of Engineering)F. Runkel, A. F. Arrieta, P. Ermanni (ETHZurich)B. Brank, A. Stanić, B. Hudobivnik (Universityof Ljubljana)A. Muc, P.D. Pastuszak (Cracow University ofTechnology)A. Muc, P. Kędziora (Cracow University ofTechnology)TitleExperimental and analytical characterization of fluted-coresandwich composite structuresLower Bound Buckling Loads for Design of LaminateComposite CylindersAnalysis of dynamic buckling of FGM plate under pulse ofheat flux and compression forceNumerical model of postbuckling behaviour of GFRPbeams subjected to pure bendingLoad-carrying capacity of thin-walled composite beamssubjected to pure bendingDelamination of secondary bonding around cuts in acompressively loaded CFRP skinned sandwich structureCouple Instabilities of Stiffened Panels with MultipleStiffener SizesSemi-analytical global and panel buckling of compositegrid-stiffened cylindrical shellsImperfection-insensitive shells using variable stiffnesscompositesProgressive damage modeling in composite: from aerospaceto automotive industryOn the method of calculation of buckling and postbucklingbehavior of laminated shells with small arbitraryimperfectionsA necessary correction of the classical analyses for bucklingof circular arches, rings, and tubesEffect of Asymmetric Meshing on the Buckling Behaviourof Composite Cylindrical Shells under Axial CompressionWrinkling of thin spherical shells on elastic substratesStability behaviour of composite laminates with and withoutcut-out under non-uniform edge loadsStructural Tailoring for Enhanced Bending-Twist Couplingthrough Elastic InstabilitySimulations of surface wrinkling of bi-layer compositeBuckling and post-buckling of FML compressed open crosssection profilesA fast approach on postbuckling analysis of compositestiffened structuresClosed-form local buckling analysis of shear-deformablecomposite laminated beam structuresInfluence of bending-twisting-coupling on the bucklingbehaviour of composite laminated plates – a new look at anold problemRemarks on buckling analysis of composite plates and shellsBuckling enhancement of laminated structures withpiezoelectric actuatorsIndustrial Branching analysis and assessment of thestructural load carrying behaviour of composites in the postbuckling regimeDesign, fabrication and testing of hybrid nano compositestructuresFinite element buckling analysis of skin-stiffener anisogridfuselage structuresDiscussion for statistical methods on buckling knockdownfactorHow Optical 3D Metrology supports Component Designand the Optimization of Numerical Simulations
3rd Int. Conference on Buckling and Postbuckling Behaviour of CompositeLaminated Shell StructuresConference Venue:Technical University of Braunschweig,Pockelsstrasse 4 (Altgebäude),Braunschweig, Germanywith DESICOS Workshop25-27 March 2015, Braunschweig, Germany, www.desicos.eu25th March (Day 1)8.30- 10 -Registration9.45R. Degenhardt - Welcome10.00 12.00Keynote lectures13.00 14.40DESICOS - Workpackage summariesthth26 March (Day 2)27 March (Day 3)8.00Registration8.00Registration8.30 10.00Keynote lectures8.30 10.00Keynote lectures10.30 12.30Improvedtheories /concepts10.30 12.10ExperimentsDesign andanalysis13.00 14.20New conceptsDesign andanalysis15.00 16.30Keynote lectures16.30R. Degenhardt - Closing remarks16.35End of Conference12.10 15.00DamagedstructuresDesign andanalysisDESICOS Workshop(Demonstration of improved tools,designs, testing)Online-session: access via www.ifarlink.aero15.10 17.30DESICOS - Achievements of the PhDstudents - New design concepts15.00 17.30Semianalyticalconcepts18.00Transfer to Dinner18.00Transfer to DLR18.30 22.30Conference Dinner (at Dornse)18.30 20.30DLR visiting lab tour1) Welcome by Mrs. Annegret Ihbe(Mayoress of the City)20.45Transfer to hotels2) Dinner speech: Prof. Joachim Block(ROSETTA Lander - a challenging mission tothe origins of the solar system)22.45Transfer to hotelsExperimentsDesign andanalysis
25th March 2015 (Day 1)9.00Registration9.45R. Degenhardt (DLR, PFH)10.0010.3011.0011.30- 11 -WelcomeKeynote lecturesChair: Martin Wiedemann (DLR)Hansjörg Dittus (DLR, Member of executive board, responsible for space)Reusability – DLR s new R&D-programme for launch technologiesMark Hilburger (NASA, Senior researcher)Subscale and Full-Scale Testing of Buckling-Critical Launch Vehicle StructuresAndreas Rittweger (DLR, Head of Institute of Space Systems)Pre-Dimensioning of Launch Vehicles due to Booster Load Introduction based on Semi-Analytical MethodsPeter Linde (Airbus)Structural Modelling and Simulation of Aircraft Composite Structures; State of the Industry12.00 Buffet lunch13.0013.2513.4013.5514.1014.25DESICOS - Workpackage summariesChair: Eelco Jansen (Leibniz University Hanover)R. Degenhardt (DLR, PFH)DESICOS - New Robust Design Guideline for Imperfection Sensitive Composite Launcher StructuresK. Kalnins (Riga Technical University)WP 1 - BenchmarkingC. Bisagni (Politecnico di Milano, TU-Delft)WP 2 - Material characterization and design of structures for buckling testsM. Ruess (TU-Delft)WP 3 - Development & application of improved design approachesH. Abramovich (Technion)WP 4 - Manufacturing and buckling testsP. Blanchard (Airbus)WP 5 - Contribution to improved design guidelines14.40 Coffee c websession, Register for free at http://goo.gl/6cWRwRDESICOS - Achievements of the PhD students: New design conceptsChair: Chiara Bisagni (TU-Delft)R. Degenhardt (DLR, PFH), Chiara Bisagni (TU-Delft)WelcomeK. Liang, M. Ruess (TU-Delft)New robust knock-down factors for the stiffened cylinderA. Meurer, M. Dannert, R. Rolfes (Leibniz University Hannover)New Design Approach for Axially Compressed Composite Cylindrical Shells combining the Single PerturbationLoad Approach and Probabilistic AnalysesS. G. P. Castro, C. Mittelstedt, F. A. C .Monteiro, M. A. Arbelo , R. Degenhardt, G. Ziegmann (PFH, DLR, TUClausthal. Sogeti)A semi-analytical approach for linear and non-linear analysis of unstiffened laminated composite cylinders andcones under axial, torsion and pressure loadsM. Alfano, C. Bisagni (Politecnico di Milano, TU-Delft)Reliability assessment of buckling response of axially compressed sandwich composite shells with andwithout cut-outsL. Friedrich, H. Reimerdes, K. Schröder (RWTH Aachen)Advanced sizing strategies for preliminary design of orthotropic grid stiffened shell structuresR. Khakimova, R. Degenhardt (DLR)Assessment of the Single Perturbation Load Approach on composite conical shellsJ. Kepple, M. Herath, G. Pearce, G. Prusty, R. Thomson (CRC-ACS, University of New South Wales,Stochastic analysis of imperfection sensitive composite cylinders using realistic imperfection modelsDiscussionEndTransfer to dinner17.4017.5018.0018.30 - Conference Dinner (Dornse)Agenda: see page 1622.30 1) Welcome by Mrs. Annegret Ihbe (Mayoress of the City of Braunschweig)2) Dinner speech: Prof. Joachim Block (ROSETTA Lander - a challenging mission to the origins of thesolar system)22.45 Transfer to hotels
26th March 2015 (Day 2)Keynote lecturesChair: Saullo Castro (Embraer)8.30Christian Hühne (DLR, Head of department Composite Design)Single perturbation load approach – From the initial idea until today9.00JN Reddy (Texas AM University, USA)Refined theories and finite element models for the analysis of laminated composite structures: An overview9.30John Hart-SmithThe use of simple strain-energy concepts to debunk the classical thin-shell buckling analyses for once and for all10.00Coffee breakRoom 1Semi-analytical conceptsChair: David Gao (AustralianNational University)10.30 V. K. Mantzaroudis, D.G. StamatelosC02Room 2Damaged structures / Bucklingwith piezos / FGMRoom 3Chair: Marc Schultz (NASA)Chair: Kaspars Kaknins (RTU)Design and AnalysisA. Köllner, C. Völlmecke (TU-Berlin)C12B. Goller, H. Haller (INTALES)(Hellenic Air Force Academy)Closed-form local skin bucklingsolution for orthotropic and anisotropicstiffened panels braced with omegastringers10.50 T. Kühn, H. Pasternak, C. MittelstedtBuckling and post-buckling behaviourof delaminated composite strutsC32(EADS EFW, TU Cottbus, Sogeti)Closed-form local buckling analysis ofshear-deformable compositelaminated beam structures11.10 M. A. Castillo-Acero, C. Cuerno-J.P. Delsemme, M. Bruyneel, Ph.Jetteur, B. Magneville, T. Naito, Y.Urushiyama (SAMTECH, Honda)Highly Orthotropic Panels StructuralStability, Farrar and Bloch WavesTheoryProgressive damage modeling incomposite: from aerospace toautomotive industryC01C07Technology)Application of different versions offinite strip Method as fast tools forbuckling analysis of Compositestiffened shells11.50 T. A. Schmid Fuertes, H.-G.Buckling and post-buckling analysesof circular composite cylinders underaxial compression using a semianalytical approachC22Analysis of dynamic buckling of FGMplate under pulse of heat flux andcompression forceDESICOS WorkshopT. Kubiak (Lodz University ofTechnology)Numerical model of postbucklingbehaviour of GFRP beams subjectedto pure bendingA. Muc, P. Kędziora (CracowUniversity of Technology)L. Czechowski (Lodz University ofTechnology)T. Rajanna, Sauvik Banerjee, YogeshM. Desai, D.L. Prabhakara (IndianInstitute of Technology) SahyadriCollege of Engineering)Stability behaviour of compositelaminates with and without cutoutunder non-uniform edge loadsC35Buckling enhancement of laminatedstructures with piezoelectric actuatorsC08Reimerdes (Airbus, RWTH Aachen)C18Delamination of secondary bondingaround cuts in a compressively loadedCFRP skinned sandwich structureRejado, M. A. Gómez-Tierno(Aernnova, UPM)11.30 H. Assaee (Shiraz University of12.1015.00K.C. Gopalakrishnan, R. RameshKumar (Government EngineeringCollege, CET and GEC Barton Hill,Thriruvananthpuram)Industrial Branching analysis andassessment of the structural loadcarrying behaviour of composites inthe post buckling regimeB. Brank, A. Stanić, B. Hudobivnik(University of Ljubljana)Simulations of surface wrinkling of bilayer compositeC15A. Watson, B. Wang, S. Wang, C.Harvey (Loughborough University)Couple Instabilities of StiffenedPanels with Multiple Stiffener Sizessee page 17(Demonstration of improved tools, designs, testing)(Buffet lunch coffee in parallel)
26th March 2015 (Day 2)Room 1Room 2Room 3Improved theories / conceptsExperimentsDesign and AnalysisChair: Theodor-Andres SchmidFuertes (Airbus)Chair: J. Gomez (Airbus Defence &Space)Chair: T. Rajanna (Indian Instituteof Technology Bombay)15.00 J. Croll, M. Wang (Uni. CollegeLondon, China Uni. of Petroleum)C14M. Brojan, D. Terwagne, R. Lagrange,P. Reis (Uni. of Ljubljana, ULB, MIT)C26E. J. Barbero, A. Madeo, G. Zagari,R. Zinno, G. Zucco (West VirginiaUniversity, University of Calabria)Wrinkling of thin spherical shells onelastic substratesLower Bound Buckling Loads forDesign of Laminate CompositeCylinders15.20 E.L. Jansen, T. Rahman, R. Rolfes(Uni. Hannover, TNO DIANA BV)Towards mode selection criteria formulti-mode initial postbucklinganalysis of composite cylindricalshellsImperfection sensitivity analysis ofcomposite cylindrical shellsusing Koiter’s methodB17C13M. Schultz, L. Oremont, M. HilburgerA. Muc, P.D. Pastuszak (Cracow(NASA)University of Technology)Experimental and analyticalRemarks on buckling analysis ofcharacterization of fluted-corecomposite plates and shells15.40 S. G. P. Castro, M. A. Arbelo , R.Degenhardt (PFH, DLR)B22H. Abramovic
2nd Int. Conference on Buckling and Postbuckling Behaviour of Composite Laminated Shell Structures Braunschweig, Germany, 5-7 September 2008, demonstrating results from the EU project COCOMAT, www.cocomat.de. Topics New achievements in the following topics of buckling, postbuckling and collapse
DIC is used to capture buckling and post-buckling behavior of large composite panel subjected to compressive loads DIC is ideal for capturing buckling modes & resulting out-of-plane displacements Provides very useful insight in the transition regime from local skin buckling to global buckling of panel
numerical post-buckling critical load is more conservative than that obtained in physical tests [4,5,6].Typical load-shorting of stiffened structure undergoing buckling and post-buckling response are shown in Figure 3 where corresponding simplifications have been overlaid indicating the k1 pre-buckling, k2 post-buckling, k3 collapse
post-buckling conditions. The results without considering any kind of imperfection, are closed and in good agreement with the tests in terms of buckling and post-buckling stiffness, as well as of collapse loads. Jiang et al. [13] studied the buckling of panels subjected to compressive stress using the differential quardrature element method.
Understanding Buckling Behavior and Using FE in Design of Steel Bridges STEVE RHODES AND TERRY CAKEBREAD, LUSAS, New York, NY IBC-13-05 KEYWORDS: Elastic Buckling, Eigenvalue Buckling, Nonlinear Buckling
The aim of this work is to present and discuss the results of an ongoing numerical investigation on the buckling, post-buckling, collapse and DSM design of two-span lipped channel beams.The numerical results presented were obtained through (i) GBT buckling analyses and (ii) elastic and elastic-plastic shell finite element (SFE) post-
formed steel C and Z sections is complicated by yielding and the potential for local, distortional, and lateral-torsional buckling of the section, as shown in Fig. 1. Local buckling is particularly prevalent and is characterized by the relatively short-wavelength buckling of individual plate
A “short” column fails by compression yield Fig 1: “short” vs “long” columns A “long” column fails by predominant buckling Version II 6-2. INTRODUCTION TO COLUMN BUCKLING 2.0 ELASTIC BUCKLING OF AN IDEAL COLUMN OR STRUT WITH PINNED END
Ch.1 Basics of Black Holes 8 To Index or with the energy-momentun tensor decreasing as O(Ω) at infinity, ˆΩhasto satisfy the condition ( ˆΩ)2 2Λ n(n 1) (1.1.13) This implies that
