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一、引言 疲劳裂纹扩展是预测结构疲劳寿命所必需的基本力学性能之一,而要取得有用的裂纹扩展速率数据,必有可靠的裂纹检测分析方法。在常温下,直读、柔度、涡流、超声、电阻及电位等方法均可应用,但在航空及其他动力装置用高温材料的试验研究中,则几乎只有紧拉(CT)试样的电位法可供使用。因此,较全面地分析CT型试样的电位分布,探讨优先的试验方案和给出相应的裂纹电位标定函数是非常必要的。
I. INTRODUCTION Fatigue crack growth is one of the basic mechanical properties necessary to predict the fatigue life of a structure. To obtain useful crack growth rate data, there must be a reliable method of crack detection and analysis. At room temperature, methods such as direct reading, compliance, eddy current, ultrasonic, resistance, and potential are all available. However, in the field of high temperature materials for aerospace and other power plants, there are almost only the potentials Law available. Therefore, it is necessary to analyze the potential distribution of CT samples more comprehensively, discuss the preferential test scheme and give the corresponding calibration function of crack potential.