论文部分内容阅读
鉴于现行载荷分离理论中存在的量纲不对等问题,依据相似原理提出了无量纲载荷分离法.弹塑性有限元分析结果较好地验证了对应于单边裂纹弯曲(Single Edged Notched Bending,SEB)和紧凑拉伸(CompactTension,CT)试样的无量纲载荷分离的普适性.基于无量纲载荷分离新方法,提出了改进的分离参数Spb法.新方法消除了参考钝裂纹试样及标定点选择的影响,通过同卸载柔度法的对比研究,新方法的可行性得到了验证.采用新方法完成了某输气管道焊接球阀的裂纹尖端张开位移(Crack Tip Opening Displacement,CTOD)评定.
In view of the existing problem of dimensional inequality in the theory of load separation, a dimensionless load separation method is proposed based on the principle of similarity. The results of elasto-plastic finite element analysis (FEM) validate the performance of a single Edged Notched Bending (SEB) And CompactTension (CT) specimens.Based on the new method of dimensionless load separation, an improved separation parameter Spb method is proposed.The new method eliminates the reference blunt crack specimen and the calibration point The feasibility of the new method is verified by comparing with the unloading compliance method.The Crack Tip Opening Displacement (CTOD) assessment of a gas pipeline welded ball valve was completed by a new method.