夹杂物形状对夹杂/基体界面应力应变分布的影响

材料导报

2019, Vol. 33

Issue (z1): 436-439

金属与金属基复合材料

夹杂物形状对夹杂/基体界面应力应变分布的影响

刘新灵^1,2,3, 陶春虎^1,2,3, 王天宇^1,2,3

1 中国航发北京航空材料研究院, 北京100095
2 材料检测与评价航空科技重点实验室, 北京100095
3 航空材料检测与评价北京市重点实验室, 北京100095

Influence of Inclusion Shape on the Stress and Strain Distribution at the Interface of Inclusion and Matrix

LIU Xinling^1,2,3, TAO Chunhu^1,2,3 , WANG Tianyu^1,2,3

1 AVIC Failure Analysis Center, Beijing Institute of Aeronautical Materials, Beijing 100095
2 Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation, Beijing 100095
3 Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation, Beijing 100095

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摘要夹杂物形状对粉末高温合金裂纹萌生具有明显影响,利用有限元模拟和弹性理论复变函数方法,研究了同一尺寸、位置下,不同夹杂物形状对应力应变分布的影响,结果表明,当夹杂物为椭圆形时,随着平行于加载方向椭圆半轴增加、垂直于加载方向椭圆半轴减小,夹杂物/基体界面处的正应力明显增大,最大塑性应变位置向加载方向转移,最大塑性应变值也增大;当夹杂物为存在几何角点的非椭圆形状时,在几何角点处存在应力奇异性,此时需要用应力强度系数表征角点附近的应力场强。

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关键词: 粉末高温合金夹杂物形状界面应力应变

Abstract: The shape of inclusion has obvious influence on the crack initiation of powder superalloy. The influence of inclusion shape on stress & strain distribution was researched for inclusions with the same size and same position by Function of Complex Variables of elastic theory. The results show that the variation of inclusion shapes has clearly effect on the stress & strain distribution. When inclusion shape is ellipse, the normal stress of inclusion-matrix interface, the angular θ, and the maximum plastic strain may increase with the increase of the elliptic half axis parallel to the loading direction, the elliptic half axis perpendicular to the loading direction decrease. When inclusion shape is not the ellipse but the polygon, there are stress singularities at the corner joint of polygon. At this time, stress intensity factor was used to represent the stress field of polygon corner joint.

Key words: powder metallurgy superalloy inclusion shape interface stress and strain distribution

出版日期: 2019-05-25 发布日期: 2019-07-05

ZTFLH:

TJ430.4

基金资助: 国家高技术研究发展计划(“863”计划)(2015AA034401)

作者简介: 刘新灵,博士,研究员。获省部级奖3项,发表文章40余篇,著作3部,负责973、国家863、国防技术基础等多项科研项目。主要从事失效分析与预防、寿命预测与安全评估、疲劳断口定量分析、失效分析专家系统和先进高温合金材料损伤行为研究。liuxinling119@163.com

引用本文:

刘新灵, 陶春虎, 王天宇. 夹杂物形状对夹杂/基体界面应力应变分布的影响[J]. 材料导报, 2019, 33(z1): 436-439.
LIU Xinling, TAO Chunhu , WANG Tianyu. Influence of Inclusion Shape on the Stress and Strain Distribution at the Interface of Inclusion and Matrix. Materials Reports, 2019, 33(z1): 436-439.

链接本文:

http://www.mater-rep.com/CN/ 或 http://www.mater-rep.com/CN/Y2019/V33/Iz1/436

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