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通过无限大板直线裂纹Ⅰ型加载下小范围屈服条件及裂纹在复合型加载下其前缘塑性区的讨论,得到了复合型裂纹的小范围屈服条件。在此基础上再通过提升机主轴应力强度因子,讨论了2.5M提升机主轴用线弹性断裂力学加以分析时应满足的具体条件。计算结果表明,在卡罐时的非常加载情况下,用线弹性断裂力学分析主轴有应力集中的表面裂纹时,将产生较大误差,即不适于按线弹性断裂力学加以分析;而在主轴其它部位,以及主轴在正常加载情况下的裂纹问题,则可以得到较高精度的结果,即满足小范围屈服的条件。
Through the discussion of the small-scale yielding conditions and the plastic zone in the leading edge of the crack under the linear loading of the infinite plate, the small-scale yielding conditions of the composite crack are obtained. On this basis, through the stress intensity factor of the main shaft of the hoist, the specific conditions that should be satisfied when the 2.5M hoist spindle is analyzed by the elastic fracture mechanics are discussed. The calculation results show that when the tank is under very load, the linear elastic fracture mechanics analysis of the surface stress stress concentrated surface cracks will have a greater error, that is not suitable for linear elastic fracture mechanics to be analyzed; the spindle other Parts, and the crack of the spindle under normal loading conditions, the result of higher accuracy can be obtained, that is, the condition of yielding in a small area can be satisfied.