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机构地区:[1]长江大学机械结构强度与振动研究所 [2]长江大学工程技术学院
出 处:《石油机械》2015年第7期75-79,共5页China Petroleum Machinery
基 金:国家自然科学基金项目"超高压压裂泵自增强残余应力变化规律研究"(51374041);"十二五"国家油气重大专项"泵头体自增强技术研究"(2011ZX05048-07HZ)
摘 要:针对裂纹对厚壁筒自增强处理效果影响的问题,采用有限元软件分析了2种径比不同裂纹的厚壁筒自增强处理后的残余应力分布规律,并通过节点位移外推法计算了裂纹尖端处的应力强度因子。研究结果表明,不同径比时自增强压力的变化决定了含裂纹厚壁筒在裂纹尖端残余压应力的分布,以及裂纹尖端应力强度因子的变化率;尖端前缘自由表面存在残余压应力区域,促进了裂纹的闭合;随着自增强压力的增大及裂纹长度的减小,扩大了裂纹尖端沿裂纹扩展方向的残余压应力区域范围。The finite element software is used to address the issue of influence of cracks on the effectiveness of self-reinforcing treatment of thick-wall cylinder. The distribution rule of residual stress following self-reinforcing treatment of thick-wall cylinders with cracks and of 2 different diameter ratios is analyzed. The stress intensity factor at the crack tip is calculated using the node displacement extrapolation method. The results show that the distribu- tion of residual compressive stress as well as the change rate of the stress intensity factor at the crack tip in crack- containing thick-wall cylinders of different diameter ratios is subject to the variation of self-reinforcing pressure. The closing of cracks is promoted in those areas of the tip' s front-edge free surface where residual compressive stress is present. As the self-reinforcing pressure increases and the crack length decreases, the area covered by residual compressive stress on the crack's tip along the expanding direction of the crack is enlarged.
关 键 词:厚壁筒 自增强 残余压应力 裂纹 径比 应力强度因子
分 类 号:TU279.748[建筑科学—建筑设计及理论]
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