球形压痕的凸起凹陷行为及其对硬度测量的影响

材料研究学报

2009, Vol. 23

Issue (1): 54-58

研究论文

本期目录 | 过刊浏览

球形压痕的凸起凹陷行为及其对硬度测量的影响

崔航; 陈怀宁; 陈静; 黄春玲; 吴昌忠

中国科学院金属研究所沈阳 110016

Behavior of pile-up and sinking-in around spherical indentation and its effect on hardness determination

CUI Hang; CHEN Huaining; CHEN Jing; HUANG Chunling; WU Changzhong

Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110016

引用本文:

崔航陈怀宁陈静黄春玲吴昌忠. 球形压痕的凸起凹陷行为及其对硬度测量的影响[J]. 材料研究学报, 2009, 23(1): 54-58.
, , , , . Behavior of pile-up and sinking-in around spherical indentation and its effect on hardness determination[J]. Chin J Mater Res, 2009, 23(1): 54-58.

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摘要:

采用球形压头的数值模拟表明, 当应变硬化指数n大于0.23时, 不论屈服应变σ_y/E为何值, 在压入过程中所有材料的压痕周围均出现凹陷; 当n小于0.23时, 随着σ_y/E的增大, 材料由凸起向凹陷转变; 当σ_y/E大于0.02时, 不论n为何值材料也都出现凹陷; 当σ_y/E小于0.02时, 材料出现凸起向凹陷的转变. 当比值残余压痕深度/最大压入深度(h_f /h_max)小于0.76时, 材料出现凹陷, n值越大凹陷越严重; 当(h_f /h_max)}>0.76, 若n<0.23材料出现由凸起向凹陷转变, 若n>0.23材料均发生凹陷. 还得到了反映凸起凹陷的表观参量c₂与接触面积A_m之间的函数关系, 分析了c₂对压痕硬度误差的影响规律.

关键词 ：材料科学基础学科, 有限元法, 压痕的凸起凹陷, 球形压痕, 屈服应变, 硬化指数

Abstract：

By the numerical simulation of spherical indenter, it was observed that for the material with strain hardening exponent n >0.23, sinking-in will happen for all values of yield strain σy/E, but when n <0.23, both pile-up and sinking-in depend on the changing of σy/E. For the material with σ_y/E >0.02, sinking-in was observed for all values of n during indenting, but when σ_y/E <0.02, both pile-up and sinkin depend on the changing of n. For the ratio of residual indentation depth and maximum indentation depth (h_f /h_max)<0.76, the material shows sinking-in behavior, and the higher strain hardening exponent is, the greater sinking-in is. For h_f /h_max>0.76, pile-up changes to sinking-in when n <0.23 and totally sinking-in when n >0.23. The relation between the feature of pile-up or sinking-in c2 and contact area was obtained, and the effect of c2 on error of hardness was analyzed.

Key words： foundational discipline in materials science finite element analysis pile-up and sinking-in spherical indentation yield strain strain hardening exponent

收稿日期: 2008-06-25

ZTFLH:

TG115

基金资助:

中俄政府间科技合作资助项目20070634.

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