工业纯钛TA2非概率失效评定曲线研究

基于中心复合实验设计方法,对材料性能、裂纹尺寸、操作压力等不确定参数对失效评定曲线的影响水平作了定性分析;同时利用参数敏感性分析方法,对上述不确定性参数对失效评定曲线的影响进行了定量分析。结果表明,定性和定量分析具有一致性。基于EPRI工程计算方法,利用概率理论建立了TA2材料的概率失效评定曲线(Probabilistic Failure Assessment Curve,PFAC);利用区间分析理论,建立了TA2材料的非概率失效评定曲线(Non-probabilistic Failure Assessment Curve,NPFAC),对比PFAC和NPFAC发现利用NPFAC进行缺陷失效评定是有效可行的。

Non-probabilistic Failure Assessment Curve for Commercially Pure Titanium TA2

Based on the central composite experimental design method, the impact levels of uncertain parameters to failure assessment curve were qualitatively analyzed, such as material properties, defect dimension and operating pressure. With the sensitivity method, the impact levels of uncertain parameters to failure assessment curve were quantitatively analyzed. It is demonstrated that the qualitative results and quantitative results are consistent. Based on EPRI method, probabilistic failure assessment curves (PFAC) of commercially pure titanium TA2 were established with the probabilistic method, and non-probabilistic failure assessment curves (NPFAC) were established based on interval analysis method. Compared NPFAC with PFAC, it could be found that NPFAC for structural defect assessment is feasible and effective