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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。
In this paper, the acoustic emission energy technique is used to study the deformation and fracture characteristics of low-strength and high-plasticity α-Ti. It is found that there is a linear relationship between the total energy of acoustic emission ΣE and the long-term stress field σ-σs lgΣE-lg (σ-σs), the inflection point of the curve is the cracking point. It is therefore possible to use this method to more accurately determine the cracking point of low-strength, high-plasticity materials, solving the problem of fracture mechanics testing of such materials. There are two kinds of acoustic emission sources during the deformation and fracture of α-Ti: the slip and the cracked emblem caused by dislocation movement and growth.