NM-JP-3 Numerical Simulation of Void Coalescence for Alpha-Iron in the Presence of Hydrogen

Abstract

V ｛ )ia coalescence is the most common f浙1ure initiation mechanism in du(rtile metals ． Many factors ， influence void coalescence ． In 伽 s work our concern is with regard to hydrogen embrittlement phenomen4 where the presence of hydrogen infiuences void coalescence ． We simulate the void 、 coalescence mode1 wi 止 in a square void array in the presence of hydrogen in order to identify the sigriificar ｝ ce of hydrogen effectS on the deformation localiZation process and ultimate 且 y void coalescence ． by internal necking void coalescence mechanism ． The numerical results for 冖 Alpha 尸 lron dicate that hydrogen accelerates void growth and coalescence and e 証hances the shear ' " io ' calization ， hn ' a Which then Promotes ductile fractUre ． lt is also fc ) und that voids hre elongated in 内 thE d通 d 匠 oh ・ p6rpendicu 韮 ar ， rather than para1 】 e 呈 ， to the tensile axis in 廿le prgs 碍 nce of hydrogen at ． ∴ larrge plasti6 Strain ， which shows good agreement with previous experi 皿 ental studies ． Kay ｝ wordS ： ducn − le ／ iaentre ， ジoid CO αlescence ， hydrogen einbrirtlement ・ void a 卿