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主要研究单晶冷却叶片强度和疲劳寿命的尺寸效应影响,实验试样是从商业冷却叶片上加工的小尺寸试样。实验研究了冷却叶片的强度尺寸效应;结合单晶材料的本构关系及其应力因子模拟了冷却叶片的强度和疲劳寿命;对于两类冷却叶片的强度和寿命进行数值模拟;拉伸试验发现,对于小试样其拉伸极限强度小于标准试样,因此,引入安全系数来评估冷却叶片的强度。对于小尺寸试样和标准尺寸试样的强度和疲劳寿命的实验比较表明,尺寸变化对冷却叶片的强度和疲劳寿命有显著影响。本研究可以为单晶冷却叶片的强度评估和结构设计提供参考。
The main study of single-crystal cooling blade strength and fatigue life of the size effect, the experimental sample is commercial cooling blade processing of small-size samples. The strength and the fatigue life of the cooling blade were simulated by the constitutive relation and the stress factor of the single crystal material. The strength and life of the two kinds of cooling blade were numerically simulated. According to the tensile test, For small specimens, the tensile ultimate strength is less than that of the standard specimens. Therefore, the safety factor is introduced to evaluate the strength of the cooling blades. An experimental comparison of the strength and fatigue life of small and standard size specimens shows that dimensional changes have a significant effect on the strength and fatigue life of the cooling vanes. This study can provide reference for the strength evaluation and structural design of single crystal cooling blade.