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本文导出一种用光弹性等色条纹图确定混合型应力强度因子的方法。按此法,采集在等色线条纹的非线性区域之外的数据,并通过逐步逼近至裂纹尖端来确定K_Ⅰ和K_Ⅱ。因此,不必特别注意试件的制备。实验证明,此法具有一定精度。现以40曲轴平面模型作为一个应用实例。通过沿连杆轴颈到主轴颈最小截面方向的不同深度人工裂纹进行应力分析,给出了裂纹扩展应力强度因子的规律性,为估计曲轴的疲劳寿命提供实验数据。光弹性已成为求解断裂力学问题的一个有力工具。
In this paper, a method for determining the mixed stress intensity factor by photoelastic color bar graph is derived. According to this method, data outside the non-linear region of the isochromatic line stripes were collected and K_I and K_II were determined by gradually approaching the crack tip. Therefore, it is not necessary to pay special attention to the preparation of test pieces. Experiments show that this method has a certain accuracy. Now 40 crankshaft plane model as an application example. The stress analysis of the artificial crack along the direction of the connecting rod journal to the minimum cross section of the main journal gives the regularity of the stress intensity factor of crack propagation and provides experimental data for estimating the fatigue life of the crankshaft. Photoelasticity has become a powerful tool for solving fracture mechanics.