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基于统一强度理论计算应力强度因子的研究

发表时间:2009-03-15  浏览量:1644  下载量:820
全部作者: 张志刚,翟振东
作者单位: 长安大学理学院;长安大学建筑工程学院
摘 要: 应用统一强度理论,研究受双向拉伸及切应力共同作用下的Ⅰ-Ⅱ复合型裂纹问题。假设考虑Ⅰ-Ⅱ复合型裂纹尖端附近应力场裂纹尖端延长线上的非奇异项应力的影响,给出了包含反应材料拉压性能差异的参数α及反应中间主应力效应的参数b的统一强度公式。通过等效应力αeq,τeq,推导出复合型裂纹应力强度因子KⅠ,KⅡ的数学表达式。采用裂纹尖端应力场渐进逼近求得KⅠ,KⅡ. 结果表明:此方法与解析法所求结果一致。
关 键 词: 工程力学;统一强度理论;复合型裂纹;应力强度因子;等效应力
Title: Calculation research of the stress intensity factor based on the unified strength theory
Author: ZHANG Zhigang, ZHAI Zhendong
Organization: College of Science, Chang’an University;School of Civil Engineering, Chang’an University
Abstract: The Ⅰ-Ⅱ complex crack problems under the joint action of two-way stretch and shear stress are studied by using twin shear unified strength theory. Taking the impact of non-singularity of the stress on the crack-tip extended line of stress field near the tip of Ⅰ-Ⅱ complex crack into account, the unified strength formula containing parameters of difference in tensile and compressive properties and the intermediate principal stress effect is given. The mathematical expressions of the stress intensity factor KⅠ, KⅡ of the Ⅰ-Ⅱ complex crack are deduced through the equivalent stress αeq, τeq. KⅠ, KⅡ are gained through the gradual approach of crack-tip stress field. The results are in accordance with the results from analytic method.
Key words: engineering mechanics; unified strength theory; complex crack; stress intensity factor; equivalent stress
发表期数: 2009年3月第5期
引用格式: 张志刚,翟振东. 基于统一强度理论计算应力强度因子的研究[J]. 中国科技论文在线精品论文,2009,2(5):471-476.
 
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