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镍基双晶体晶界断裂特性研究
引用本文:万建松,岳珠峰,吴德强. 镍基双晶体晶界断裂特性研究[J]. 实验力学, 2001, 16(2): 135-141
作者姓名:万建松  岳珠峰  吴德强
作者单位:西北工业大学工程力学系,
基金项目:国家自然科学基金(59501009)和航空基础研究基金资助
摘    要:对单晶体以及晶界平行晶粒裂纹和晶界垂直晶粒裂纹的双晶体的断韧性进行了实验研究,设计了三种三点弯曲试件,得到了单晶体和晶界的断裂韧性值,在晶界垂直晶粒裂纹的双晶体试验中,揭示了晶界对晶粒断裂的屏蔽效应;当裂纹距晶界某一特定长度时,断裂韧性值最大,理论分析和晶体滑移有限元数值分析揭示了这种屏蔽效应的机理,双晶晶界处的变表相容性导致了理解纹尖端应国和场的重新分布,并由此产生了晶界屏蔽效应。

关 键 词:双晶 断裂韧性 晶界 屏蔽效应 镍基
文章编号:1001-4888(2001)02-0135-07
修稿时间:2001-01-15

The Grain Boundary fracture Behavior in Ni-base Bicrystals
WAN Jian song,YUE Zhu feng,WU De qiang. The Grain Boundary fracture Behavior in Ni-base Bicrystals[J]. Journal of Experimental Mechanics, 2001, 16(2): 135-141
Authors:WAN Jian song  YUE Zhu feng  WU De qiang
Abstract:The fracture behavior for Ni base bicrystals was studied by experiments. The fracture toughness for single and bicrystals of the metal was measured by three point bending test. The shielding effect from grain boundary was found in the test for grain cracked bicrystals with the crack normal to the grain boundary. It was also found that the fracture toughness exhibited a maximum value when the distance of crack tip from grain boundary reached a certain value. Based on theoretical analysis and with the help of numerical calculation, the mechanism for the grain boundary shielding effect was revealed.
Keywords:bicrystals  fracture toughness  grain boundary  shielding effect
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