基于积分法的铝合金厚板深度残余应力分析  

Analysis of measuring residual stress depth profiling in aluminum alloy thick plate using integral method

作　　者：廖凯[1,2] 吴运新[1] 龚海[1] 

机构地区：[1]中南大学机电工程学院,湖南长沙410083 [2]桂林电子科技大学教学实践部,广西桂林541003

出　　处：《中南大学学报（自然科学版）》2010年第1期179-183,共5页Journal of Central South University:Science and Technology

基　　金：国家重点基础研究发展计划项目(2005CB623708)

摘　　要：运用第一类线性积分形式建立剥除层残余应力与试样变形之间的关系;通过变形反求应力,还原厚板内部连续的应力变化,推导应力求解积分形式;进行层削法和裂纹柔度法测试实验,比较这2种方法的测试结果的异同。研究结果表明:运用积分法求解得到的残余应力场能较准确地反映厚板内部应力分布特点;积分中核函数决定力学方法解的特征,采用层削法所得结果反映了厚板剥除层内平均应力,采用裂纹柔度法所得结果则反映裂纹处应力的平均值,这2种方法都能较准确地反映厚板内部应力特征。Relationship between deformation in plate and residual stress in removal layer was established by using the first kind of linear integral, in which deformation inverse determined continuous stress profile through-depth in aluminum alloy thick plate. With removal layer methods and crack compliance method applied in experiment, the difference of the both methods was compared. The results show that the solution of integral method presents distribution character of residual stress in thick plate, and accords with theory analysis. The kernel function of integral controls the feature of experimental methods, i.e., solution of the removal layer method reflects the average stress in removal layers and solution of the crack compliance method reflects the average stress in crack location, therefore, both the methods describing the character of inner stress in plates are comparatively accurate.

关 键 词：积分法 层削法 裂纹柔度法 残余应力 

分 类 号：TG146.2[一般工业技术—材料科学与工程]