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以10Ni5CrMoV钢为研究对象,在加载条件与构件使用环境相近条件下,在原板厚大尺寸试样表面引入人工缺口模拟实际构件中存在的类表面裂纹缺陷,采用双轴弯曲疲劳试验方法,开展原板厚大尺寸试样双轴弯曲应力下的表面裂纹疲劳扩展特性试验研究。结果表明,裂纹半长c和裂纹深度a都随循环次数N单调递增,且曲线a-N满足一定的线性关系。建立表面裂纹半长c与深度a之间的定量关系式预测模型,从而定量解决裂纹深度尺寸不好直接测量的难题。
Taking 10Ni5CrMoV steel as the research object, artificial notch was introduced into the surface of the original large plate thickness specimen to simulate the surface crack defects existing in the actual structure under the condition of similar loading conditions and component usage environment. The biaxial bending fatigue test method was used to develop the original plate Experimental Study on Fatigue Crack Growth Characteristics of Thick and Large Size Specimens under Biaxial Bending Stress. The results show that both the crack half-length c and the crack depth a increase monotonically with the number of cycles N, and the curves a-N satisfy a certain linear relationship. The quantitative predictive model between the surface crack half-length c and the depth a is established to quantitatively solve the problem of directly measuring the crack depth in bad dimensions.