本文采用声发射能量技术研究低强度、高塑性材料α-Ti的形变、断裂特征。发现声发射总能量ΣE与长程应力场σ-σs间存在lgΣE-lg(σ-σs)的线性关系,曲线的拐点即为开裂点。因而有可能利用这种方法较精确地测定出低强度、高塑性材料的开裂点,为这类材料的断裂力学测试解决了一个难题。 α-Ti的形变、断裂过程中存在两种声发射源:位错运动引起的滑移和裂纹的徽开裂和长大。
Using the technique of acoustic emission energy, the deformation and fracture in low strength and high plastic α-Ti has been studied. The logarithm of total acoustic emission energy is proportional to the logarithm of long range stress, and its turning point corresponds to the point of cracking. Therefore, it seems to be available to determine accurately the state of the cracking tip of these low strength and high plastic alloys by the method.Two kinds of acoustic emission sources were found during the plastic deformation and fracture process of α-Ti: the dislocation movement and the microcracking and growth of a crack.
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