Failure Models For Plastics - Material Characterization .
Failure models for plastics - material characterizationfor *MAT ADD EROSION (DIEM)A. Fertschej, B. Hirschmann, P. Reithofer, M. Rollant11th European LS-DYNA Conference9th – 11th May 2017, Salzburg, Austria4a engineering GmbHIndustriepark 1A-8772 Trabochfertschej@4a.co.at 43 (0) 664 80106 619http://impetus.4a.co.at/en 4a engineering GmbH, all rights reservedSeite: 1 / 23Autor: Artur Fertschej, Peter ReithoferDatum: 170509Titel: rep 17050901 afer pr gga FailureModelsForPlastics.ppt
Content Introduction Failure models Measurement possibilities using 4a impetus Material modeling Validation Summary 4a engineering GmbH, all rights reservedSeite: 2 / 23Autor: Artur Fertschej, Peter ReithoferDatum: 170509Titel: rep 17050901 afer pr gga FailureModelsForPlastics.ppt
Introduction Plastics in automotive pedestrian protection show different deformationand fracture behavior Energy absorption Failure is a function of load type, time, temperature, processing, [1][1] H. Staack, D. Seibert, H. Baier - Application oriented failure modeling and characterization for polymers inautomotive pedestrian protection, COMPLAS 2015, BarcelonaSeite: 3 / 23Autor: Artur Fertschej, Peter ReithoferDatum: 170509Titel: rep 17050901 afer pr gga FailureModelsForPlastics.ppt 4a engineering GmbH, all rights reserved
Failure Models in LS-Dynaconstant plastic strainStandard – simplePlastic strain as function of strain rateNone standard - simpleconstant plastic strain damage evolutionNone standard - simpleFailure as function of triaxiality and strain rate[2] M. Basaran, S. Wölkerling,F. Neukamm, M. Feucht, D.Weichert – An extension ofthe GISSMO damage modelbased on Lode angledependence, LS-DynaDeveloper Forum 2010,BambergAdvanced[2] 4a engineering GmbH, all rights reservedSeite: 4 / 23Autor: Artur Fertschej, Peter ReithoferDatum: 170509Titel: rep 17050901 afer pr gga FailureModelsForPlastics.ppt
Failure Models for Metals Many well known failure criteria for ductile materials [3] Tresca or maximum shear stress criterion von Mises yield criterion Gurson yield criterion for pressuredependent metals Hosford yield criterion Hill yield criteria various criteria based on the invariants ofthe Cauchy stress tensor[3] https://en.wikipedia.org/wiki/Material failure theory[4][4] F. Neukamm, M. Feucht, A. Haufe, P. DuBois – GISSMO – Material modeling with a sophisticated failurecriteria, LS-Dyna Developer Forum 2011, StuttgartSeite: 5 / 23Autor: Artur Fertschej, Peter ReithoferDatum: 170509Titel: rep 17050901 afer pr gga FailureModelsForPlastics.ppt[2] 4a engineering GmbH, all rights reserved
Failure Models for PlasticsDIEM-Model Failure surface in dependence of triaxiality and strain rate[1][1] H. Staack, D. Seibert, H. Baier - Application oriented failure modeling andcharacterization for polymers in automotive pedestrian protection, COMPLAS 2015,Barcelona 4a engineering GmbH, all rights reservedSeite: 6 / 23Autor: Artur Fertschej, Peter ReithoferDatum: 170509Titel: rep 17050901 afer pr gga FailureModelsForPlastics.ppt
4a impetusReverse engineering[5][5] aecompanion-print.htmlSeite: 7 / 23Autor: Artur Fertschej, Peter ReithoferDatum: 170509Titel: rep 17050901 afer pr gga FailureModelsForPlastics.ppt 4a engineering GmbH, all rights reserved
(Failure) Measurement Possibilities using 4a impetusTest specimens, test setup3-point bending 0.1 mm/s - 4.5 m/sClamped bending - 4.5 m/sT-specimen (rib) 0.1 mm/s - 4.5 m/s Puncture test 0.1 mm/s - 4.5 m/s 4a engineering GmbH, all rights reservedSeite: 8 / 23Autor: Artur Fertschej, Peter ReithoferDatum: 170509Titel: rep 17050901 afer pr gga FailureModelsForPlastics.ppt
Simulation Possibilities using 4a impetusTest specimens, test setup3-point bending 0.1 mm/s - 4.5 m/sClamped bending - 4.5 m/sT-specimen (rib) 0.1 mm/s - 4.5 m/s Puncture test 0.1 mm/s - 4.5 m/s 4a engineering GmbH, all rights reservedSeite: 9 / 23Autor: Artur Fertschej, Peter ReithoferDatum: 170509Titel: rep 17050901 afer pr gga FailureModelsForPlastics.ppt
Measurement Possibilities using 4a impetusHigh-speed camera Visualization of dynamic failure behavior of the material duringtest (crack initiation and propagation) Easy view, different angles possible Trigger signal from 4a impetus synchronizing 4a engineering GmbH, all rights reservedSeite: 10 / 23Autor: Artur Fertschej, Peter ReithoferDatum: 170509Titel: rep 17050901 afer pr gga FailureModelsForPlastics.ppt
Material Modeling for PlasticsComplex yield surface failureLoad casesstatic,dynamic (2x)PlasticityComplex yield surfaceFailureClassical approachShould be done with DIC(difficult at high strains !)[6]staticTypical no failure forplasticsstaticTypical failure undertensionstatic (2x),dynamic (3x)Strain rate dependencyOnly brittle materials, nofailure for ductile materials4a impetusapproach4a impetusapproachreverse engineeringreverse engineeringdynamicstatic,dynamicstatic,dynamic 4a engineering GmbH, all rights reservedSeite: 11 / 23Autor: Artur Fertschej, Peter ReithoferDatum: 170509Titel: rep 17050901 afer pr gga FailureModelsForPlastics.ppt
Material Modeling – Plasticity HardeningWorkflow for *MAT SAMP-1Reverse engineering process with 4a impetus [7]3 point bending--- lw 50 mm / 1 mm/snormalized forcenormalized force0.1 mm/s1 m/s2.5 m/s4 m/s simulation··· mean value curve of the tests simulation··· mean value curve of the tests3-point-bendingnormalized displacementnormalized displacementdynamic behavior – strain ratestatic behavior - yield--- clamped bending 4 m/snormalized forcenormalized forceClamped bending 4 m/s3-point-bending clamped simulation··· mean value curve of the testsnormalized displacementfit compression/tension behavior simulation··· mean value curve of the testsnormalized displacementcheck compression/tension behavior 4a engineering GmbH, all rights reservedSeite: 12 / 23Autor: Artur Fertschej, Peter ReithoferDatum: 170509Titel: rep 17050901 afer pr gga FailureModelsForPlastics.ppt
Material Modeling – ValidationValidation for *MAT SAMP-1Validation on further tests (*MAT SAMP-1) [7]normalized forceTensile test staticT-specimen 2 m/sClamped bending 4 m/s simulation··· mean value test curvesnormalized displacement 4a engineering GmbH, all rights reservedSeite: 13 / 23Autor: Artur Fertschej, Peter ReithoferDatum: 170509Titel: rep 17050901 afer pr gga FailureModelsForPlastics.ppt
Failure Models for PlasticsDIEM-Model DIEM: Damage Initiation and Evolution Model [6] Base: Standard material model (e.g. *MAT SAMP-1) 3 individual criteria can be used: Ductile criterion:Shear criterion:Instability criterion: D P D P ( , p ) D D ( , )P DPPp Pd P0 DP D P min orP D ( , p ) majorP P D max P DAfter initiation the damage evolution occurs: (1 D)C ep : [6] LS-DYNA KEYWORD USER'S MANUAL - VOLUME II - Material ModelsSeite: 14 / 23Autor: Artur Fertschej, Peter ReithoferDatum: 170509Titel: rep 17050901 afer pr gga FailureModelsForPlastics.ppt 4a engineering GmbH, all rights reserved
4a impetusTest data for *MAT ADD EROSION (DIEM) Evaluation of the failure strains 4a engineering GmbH, all rights reservedSeite: 15 / 23Autor: Artur Fertschej, Peter ReithoferDatum: 170509Titel: rep 17050901 afer pr gga FailureModelsForPlastics.ppt
4a impetusFailure models GUI – different possibilities to setup failure modelsTriaxialityStrain ratedependencyPost failure 4a engineering GmbH, all rights reservedSeite: 16 / 23Autor: Artur Fertschej, Peter ReithoferDatum: 170509Titel: rep 17050901 afer pr gga FailureModelsForPlastics.ppt
4a impetusFailure models GUI – different possibilities to setup failure modelsTriaxialityStrain ratedependencyPost failure 4a engineering GmbH, all rights reservedSeite: 16 / 23Autor: Artur Fertschej, Peter ReithoferDatum: 170509Titel: rep 17050901 afer pr gga FailureModelsForPlastics.ppt
Failure Modeling - Validation*MAT SAMP-1 with *MAT ADD EROSION 3-point-bending, 4 m/s, unfiltered curvesThe test curves are matched very well [7]normalized forceColored: Test curvesBlack: Simulationnormalized displacement 4a engineering GmbH, all rights reservedSeite: 17 / 23Autor: Artur Fertschej, Peter ReithoferDatum: 170509Titel: rep 17050901 afer pr gga FailureModelsForPlastics.ppt
Failure Modeling - Validation*MAT SAMP-1 with *MAT ADD EROSION Dynamic puncture test, 6.3 m/sThe test curves are matched very well [7]normalized forceColored: Test curvesBlack: Simulationnormalized displacement 4a engineering GmbH, all rights reservedSeite: 18 / 23Autor: Artur Fertschej, Peter ReithoferDatum: 170509Titel: rep 17050901 afer pr gga FailureModelsForPlastics.ppt
Failure Modeling - Validation*MAT SAMP-1 with *MAT ADD EROSION Dynamic puncture test with the part, 4.3 m/sThe test curves are matched very well [7]1,500Kraft [N] DSP06Kraft [N] DSP07normalized force1,200Kraft [N] DSP08Kraft [N] DSP09Kraft [N] DSP10900Kraft [N]Simulation60030000.000Simulation0.0010.0020.003 displacement0.0040.005normalized0.0060.007[7] A. Fertschej, P. Reithofer, M. Rollant - Failure of thermoplastics - PART 2, Material modeling and simulation, LSZeit [s]DYNA Konferenz 2015, WürzburgSeite: 19 / 23Autor: Artur Fertschej, Peter ReithoferDatum: 170509Titel: rep 17050901 afer pr gga FailureModelsForPlastics.ppt 4a engineering GmbH, all rights reserved
Failure Modeling - ValidationStatistical evaluation in 4a impetus200PPT20PC/ABS180Mean value orce [N]13500Meanvalue 02000150010005000Displacement [mm]1Example: 30 measurements for both materials (30 users) 4a engineering GmbH, all rights reservedSeite: 20 / 23Autor: Artur Fertschej, Peter ReithoferDatum: 170509Titel: rep 17050901 afer pr gga FailureModelsForPlastics.ppt
Failure Modeling - ValidationStatistical evaluation in 4a impetusForce [N]PPT2020%80%Displacement [mm]Failure probability: 20% and 80% 4a engineering GmbH, all rights reservedSeite: 21 / 23Autor: Artur Fertschej, Peter ReithoferDatum: 170509Titel: rep 17050901 afer pr gga FailureModelsForPlastics.ppt
Summary Material behavior of plastics depends on load type, time, temperature,processing, Easy evaluation of failure at high strain rates Clamped 3-point-bendingtests and puncture tests on 4a impetus *MAT SAMP-1 *MAT ADD EROSION material can be reproducedbest possible and close to reality The reverse engineering process to determine the material parametersusing 4a impetus works properly The latest software release of 4a impetus includes up to date failuremodeling accurate material modeling 4a engineering GmbH, all rights reservedSeite: 22 / 23Autor: Artur Fertschej, Peter ReithoferDatum: 170509Titel: rep 17050901 afer pr gga FailureModelsForPlastics.ppt
Thank you for your attention!Wednesday, 8:30: Workshop: MPIP – Material Parameter Identification Processwith 4a impetusThursday, 8:55:*MAT 4A MICROMEC – Theory and Application NotesThursday, 11:30:Biotex BigBag Simulation – LS-Dyna Airbag Tool – UnusualApplication15th28th February – 1st March 2018in Schladming, Austria„Plastics – Testing and Simulation”further information: http://technologietag.4a.co.at/ 4a engineering GmbH, all rights reservedSeite: 23 / 23Autor: Artur Fertschej, Peter ReithoferDatum: 170509Titel: rep 17050901 afer pr gga FailureModelsForPlastics.ppt
Failure models for plastics - material characterization for *MAT_ADD_EROSION (DIEM) A. Fertschej, B. Hirschmann, P. Reithofer, M. Rollant Seite: 1 / 23 . Typical no failure for plastics static Typical failure under tension static (2x), dynamic (3x) Strain rate dependency Only brittle materials, no
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Mapping of global plastics value chain and plastics losses to the environment onment 2 Table of contents Table of contents List of Acronyms 4 Types of plastics 5 Executive summary 6 Technical summary 9 1 oduction Intr 17 1.1. Objective 19 1.2. General methodology 19 1.3. Report structure 21 2 Global plastics value chain 23
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FRP - Fiber Reinforced Plastics. FRP has been used alternatively to mean fiberglass reinforced plastics, fiber reinforced plastics and many other reinforced plastics. In this guide, it means plastics reinforced with fibers or strands of some other material. Ganged Woven Ravings - An FRP laminate consisting of adjacent layers of woven rovings .
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