In this article, the effects of plastic anisotropy and damage on ductile crack initiation (ductile failure) are studied in a thermodynamically consistent framework. First, isotropic and anisotropic continuum damage models of Lemaitre are modified to incorporate anisotropic plasticity. In the next stage, a subroutine is developed to add the damage formulation to Abaqus finite element package. A highly ductile material with anisotropic plastic behavior, API 5L X100 pipeline steel, is selected for this study. Finite element analyses are done to simulate isotropic/anisotropic plasticity coupled with isotropic/anisotropic damage. Finite element results are compared with the result of tests on smooth and notched specimens, and the effects of anisotropic plasticity, anisotropic damage, geometry changes, triaxiality in stress and their mutual effects and interactions on post yield behavior and crack initiation are studied.
Abu Al-RubRKVoyiadjisG (2003) On the coupling of anisotropic damage and plasticity models for ductile materials. International Journal of Solids and Structures40: 2611–2643.
2.
AyadiWLaiarinandrasanaLSaïK (2018) Anisotropic (continuum damage mechanics)-based multi-mechanism model for semi-crystalline polymer. International Journal of Damage Mechanics27(3): 357–386.
3.
BadreddineHSaanouniK (2017) On the full coupling of plastic anisotropy and anisotropic ductile damage under finite strains. International Journal of Damage Mechanics26(7): 1080–1123.
BonoraN (1997) A nonlinear CDM model for ductile failure. Engineering Fracture Mechanics58: 11–28.
6.
BonoraNGentileDPirondiAet al.(2005) Ductile damage evolution under triaxialstate of stress: Theory and experiments. International Journal of Plasticity21: 981–1007.
7.
BonoraNMilellaP (2001) Constitutive modeling for ductile materials behavior incorporating strain rate, temprature and damage mechanics. International Journal of Impact Engineering26: 53–64.
8.
Bonora N, Ruggiero A, De Meo S, et al. (2008) A revised approach to damage measurement based on stiffness loss. In: Proceedings of PVP2008, ASME pressure vessels and piping division conference, 27–31 July 2008, Chicago, IL, USA.
9.
BonoraNRuggieroAEspositoLet al.(2006) CDM modeling of ductile failure in ferritic steels: Assessment of the geometry transferability of model parameters. International Journal of Plasticity22: 2015–2047.
10.
Bonora N, Ruggiero A, Esposito L, et al. (2009) Damage developement in high purity copper under varying dynamic conditions and microstructural state using continuum damage mechanics. In: Proceedings of 2009 APS SCCM conference, 28 June–3 July, Nashville, USA.
11.
BrünigM (2016) A thermodynamically consistent continuum damage model taking into account the ideas of CL Chow. International Journal of Damage Mechanics25(8): 1130–1141.
12.
GanjianiM (2018) A thermodynamic consistent rate-dependent elastoplastic-damage model. International Journal of Damage Mechanics27(3): 333–356.
13.
GhajarRMironeGKeshavarzA (2013a) Sensitivity analysis on triaxiality factor and Lode angle in ductile Fracture. Journal of Mechanics29: 177–184.
14.
GhajarRMironeGKeshavarzA (2013b) Ductile failure of X100 pipeline steel – Experiments and fractography. Materials and Design Journal43: 513–525.
15.
HambliR (2001) Comparison between Lemaitre and Gurson damage model in crack growth simulation during blanking process. International Journal of Mechanical Sciences43: 2769–2790.
16.
HillR (1950) The Mathematical Theory of Plasticity, Oxford: Clarendon Press.
17.
InalaKMishrabRKCazacuO (2010) Forming simulation of aluminum sheets using an anisotropic yield function coupled with crystal plasticity theory. International Journal of Solids and Structures47: 2223–2233.
18.
KeshavarzAGhajarRMironeG (2014) A new experimental model based on triaxiality factor and Lode ange for X100 pipeline steel. International Journal of Mechanical Sciences80: 175–182.
LiYLuoMGerlachJet al.(2013) Prediction of shear-induced fracture in sheet metal forming. Journal of Materials Processing Technology210: 1858–1869.
27.
LouYHuhH (2013) Prediction of ductile fracture for advanced high strength steel with a new criterion: Experiments and simulation. Journal of Materials Processing Technology210: 1284–1302.
28.
MashayekhiMZiaei RadS (2006) Identification and validation of a ductile damage model for A533 steel. Journal of Materials Processing Technology177: 291–295.
29.
MashayekhiMZiaei RadSParvizianJet al.(2007) Ductile crack growth based on damage criterion: Experimental and numerical studies. Mechanics of Materials39: 623–636.
30.
PardoenTHutchinsonJ (2000) An extended model for void growth and coalescence. Journal of the Mechanics and Physics of Solids48: 2467–512.
TanguyBLuTPerrinGet al.(2008) Plastic and damage behaviour of a high strength X100 pipeline steel: Experiments and modeling. International Journal of Pressure Vessels and Piping85: 322–335.
33.
TengX (2008) Numerical prediction of slant fracture with continuum damage mechanics. Engineering Fracture Mechanics75: 2020–2041.
34.
YanYSunQChenJet al.(2013) The initiation and propagation of edge cracks of silicon steel during tandem cold rolling process based on the Gurson–Tvergaard–Needleman damage model. Journal of Materials Processing Technology213: 598–605.
35.
ZhaoSDXuFGuoJHet al.(2014) Experimental and numerical research for the failure behavior of the clinched joint using modified Rousselier model. Journal of Materials Processing Technology214: 2134–2145.
