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一、引言 绝大多数金属材料及其构件的破断,其根源来源于裂纹的开裂及其随后的扩展。在一次断裂及疲劳断裂实验研究中,对于裂纹开裂点的确定,疲劳裂纹扩展的监测,通常使用显微镜表面目测法(MSMM),除此之外,物理监测法也是值得研究的方法。就应用最多的电位法而言,过去广泛使用的是直流电位法(DCPM),近年来所提出的交流电位法(ACPM)由于具有独特的优点而迅速得到发展。 ACP法首先应用于断裂韧性实验研究中,在确定裂纹试样开裂点方面已取得了成
I. INTRODUCTION The rupture of the vast majority of metallic materials and their components originates from the cracking of the crack and its subsequent expansion. In one fracture and fatigue fracture test, the physical monitoring method is also worth studying for the determination of crack initiation point and the monitoring of fatigue crack growth, usually using the microscope surface observation method (MSMM). In the most widely used potentiometric method, the DC potential method (DCPM) has been widely used in the past. The proposed AC potential method has been rapidly developed in recent years due to its unique advantages. ACP method is first applied to the experimental study of fracture toughness, crack initiation point in the determination of the crack has been made into a