自增强残余应力计算模型的研究  

Investigation on the theoretical model of autofrettage residual stress.

作　　者：薛青利[1] 

机构地区：[1]福建炼油化工有限公司

出　　处：《石油机械》2002年第3期13-15,2,共3页China Petroleum Machinery

基　　金：原中石化总公司科技开发项目"超高压厚壁圆筒的自增强理论与实践研究"部分内容

摘　　要：针对当前自增强设备设计中所依据的理想弹塑性模型误差较大的情况 ,从材料实际拉压性能出发 ,构建自增强残余应力计算模型。分析了超应变度、Bauschinger效应和材料强化对自增强压力和反向屈服的影响 ,得到了基于材料双线性理论模型的自增强残余应力、临界径比、自增强压力和Bauschinger效应系数计算式 ;通过材料性能试验、自增强处理试验和残余应力检测 ,对比分析了基于双线性理论模型和弹塑性理论模型的自增强残余应力计算式的精度。结果表明 ,双线性模型的计算精度比理想弹塑性模型高 2倍以上 ,其最大计算误差仅为 7 5 7%。As the autofrettage residual stresses computed by the idea elastic-plastic model have large errors, this article aims to establish a theoretical model of autofrettage residual stress on the basis of the actual tension-compression properties of materials. The influence of overstrain, Bauschinger effect and material strengthening on the autofrettage pressure and reverse yielding is analyzed, and the formulas for calculating the autofrettage residual stress and pressure and Bauschinger effect coefficient are obtained based on bilinear model of material. The accuracy of the calculating formulas based on the bilinear model and elastic-plastic model respectively is compared. The result shows that the accuracy of the solution based on the bilinear model is 2 times higher than that calculated by the ideal elastic-plastic model, and its maximal error is only 7.57%.

关 键 词：自增强残余应力 计算模型 研究 材料 试验 

分 类 号：TB301[一般工业技术—材料科学与工程]