Shear-driven damage of ductile metals induced by indentation load

被引:5
作者
Zhang, Chunyu [1 ]
Xiao, Wenkang [1 ]
机构
[1] Sun Yat Sen Univ, Sino French Inst Nucl Engn & Technol, Zhuhai 519082, Guangdong, Peoples R China
基金
高等学校博士学科点专项科研基金; 中国国家自然科学基金;
关键词
damage; indentation; shear; nucleation; ductility; fracture; LOW-STRESS TRIAXIALITY; FRACTURE-TOUGHNESS; INSTRUMENTED INDENTATION; GURSON MODEL; NUCLEATION; MECHANICS; RUPTURE;
D O I
10.1080/09500839.2015.1081299
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Although indentation does not induce apparent cracking in ductile materials, degradation of elastic stiffness of ductile metals has been found in micro-/macro- indentation tests. After comparing the predicted degradation by extended damaged-plasticity models with that measured by experimental testing, it is found that the softening caused by distortion of existing voids is inadequate to cause the notable degradation of elasticity. It is suggested that an independent damage-nucleation mechanism arising from shear deformation may exist. Although attractive in practical applications for its non-destructive nature, the damage-based indentation technique for estimating the fracture properties of ductile materials needs further investigation.
引用
收藏
页码:401 / 407
页数:7
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