Experimental investigation and numerical modeling for elastoplastic notch-root stress/strain analysis under monotonic loadings  

作　　者：HUANG Jia SHI DuoQi YANG XiaoGuang PAN Bing SHI Hao 

机构地区：[1]School of Energy and Power Engineering, Beihang University [2]Institute of Solid Mechanics, Beihang University

出　　处：《Science China(Technological Sciences)》2014年第7期1411-1424,共14页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.51275023);the Innovation Foundation of BUAA for PhD Graduates(Grant No.YWF-14-YJSY-49)

摘　　要：Experimental investigation and numerical modeling on elasto-plastic notch-root stress/strain distributions under monotonic loadings of both the Ni-based directionally solidified(DS)superalloy and Titanium alloy were carried out simultaneously.For measuring inhomogeneous deformation fields at notch roots,an optical-numerical full-field surface deformation measurement system was developed based on the digital image correlation(DIC)method.The obtained strain distributions were then verified with reasonable accuracy by finite element simulation,where an anisotropic elastic-viscoplastic constitutive model was developed for DS superalloy and a simple isotropic stress-strain relationship was adopted for Titanium alloy.Meanwhile,factors affecting elasto-plastic notch-root stress/strain distributions were systematically investigated numerically,where the emphasis was placed on temperature,loading stress rate,sample shape,anisotropy and notch features.The results show that stress/strain behavior at notch root is significantly affected by the mentioned factors,which are concretely embodied in the distribution of tensile stress/strain,equivalent stress and accumulative equivalent plastic strain.

关 键 词：digital image correlation notch analysis monotonic loading ANISOTROPY STRESS-STRAIN 

分 类 号：TG113[金属学及工艺—物理冶金]