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在对圆杆、圆杆表面多环形槽和螺纹根部表面裂纹应力强度因子(SIF)进行了实验研究的基础上,分析了3种SIF实验解相互间的差异和共性,在3种试件中,表面裂纹SIF值无论在裂纹最深点还是表面点,均以螺纹联接时最高,圆杆表面多环形槽次之,圆杆的值为最低,同时,还讨论了在以上3种情况下其表面裂纹前缘的扩展形态,并相现有的平面板在拉伸、弯曲疲劳载荷作用下,其表面裂纹的扩展前缘进行了比较,指出:它们虽然都是椭圆曲线的一部分,有相同的裂纹形状比a/C随裂纹深度比a/R增大而减小的变化规律,但圆杆与拉抻板的断口形态接近,而圆杆表面多环形槽和螺纹根部的断口形态则处于板的拉伸与弯曲之间。
Based on the experimental study of the stress intensity factor (SIF) on the surface of the multi-ring groove on the rod surface and the root of the rod, the differences and similarities between the three SIF experimental solutions were analyzed. Among the three specimens , The surface crack SIF value is the highest at both the deepest point and the surface point of the crack, and is the highest when the thread is connected. The surface of the round rod is more followed by multiple annular grooves, and the value of the round rod is the lowest. Meanwhile, Crack front edge of the extended form, and the existing flat panel in the tensile and bending fatigue loads, the expansion of the surface front of the crack were compared, pointed out that: Although they are part of the elliptic curve, the same crack Shape ratio a / C as the crack depth ratio a / R increases and decreases, but the shape of the broken rod is close to that of the pull tab, while the fracture shape of the multi-ring groove and the root of the rod is on the plate Stretch and bend between.