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任何构件(包含超静定结构系统)都是通过变形协调来平衡外载;光滑与钝缺口构件的疲劳破坏,一般起源于局部高塑性区萌生短/小裂纹及扩展;服役工程结构的强度评价,一般通过检测局部应变(史)来实现。这说明,局部应变法才是合理的疲劳设计分析技术。而且,工程结构的强度设计分析愈来愈多地采用有限元技术,也为局部应变法的推广应用奠定了良好基础。然而,现有(名义)应力法,常把本属于局部参量的有限元应力一应变计算结果当成名义值来处
All components (including the system of statically indeterminate structure) are balanced by deformation to balance the external load; smooth and blunt notched component fatigue damage, usually originated in the local plastic zone short / small crack initiation and extension; service engineering structure strength evaluation , Usually through the detection of local strain (history) to achieve. This shows that the local strain method is a reasonable fatigue design and analysis techniques. Moreover, the strength of structural engineering design analysis more and more use of finite element technology, but also for the promotion and application of local strain method laid a good foundation. However, the existing (nominal) stress method, often belonging to the local parameters of the finite element stress-strain calculation results as a nominal value