含V型缺口钛合金圆棒拉伸过程声发射特性研究  

Study on acoustic emission characteristics of titanium alloy round bar with V-notch during tensile process

作　　者：钟斌 杨会 强轩轩 于正洋 赵升吨[2] Zhong Bin;Yang Hui;Qiang Xuanxuan;Yu Zhengyang;Zhao Shengdun(College of Mechanical Engineering,Xi'an University of Science and Technology,Xi'an 710054,China;College of Mechanical Engineering,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]西安科技大学机械工程学院,陕西西安710054 [2]西安交通大学机械工程学院,陕西西安710049

出　　处：《锻压技术》2024年第2期247-254,共8页Forging & Stamping Technology

基　　金：国家自然科学基金资助项目(51705416)。

摘　　要：采用声发射无损检测技术对含环状V型缺口TC4钛合金试样的匀速拉伸过程进行监测,探讨了含不同V型缺口的TC4钛合金试样在拉伸过程中不同变形阶段对钛合金声发射特征参数的影响。结果表明:声发射信号的分布情况与拉伸过程中的每个阶段相对应。在整个拉伸断裂过程中,不同V型缺口试样的幅值信号主要分布在40~70 dB之间,整个塑性变形过程中仅出现少量高幅值信号,而试样在断裂瞬间均出现100 dB的高幅值信号。声发射累积计数和累积能量随着损伤的累积而增加。此外,不同V型缺口的TC4钛合金试样从弹性变形到断裂各阶段的声发射的累积能量和累积计数曲线均有明显的阶段性特征,曲线斜率大小相似,累积计数和累积能量数值大小接近。The uniform tensile process of TC4 titanium alloy samples with circular V-notch was monitored by the acoustic emission non-de-structive testing technology,and the influences of different deformation stages on the acoustic emission characteristic parameters of TC4 tita-nium alloy sample with different V-notches during the tensile process were explored.The results show that the distribution of acoustic emis-sion signals corresponds to each stage of the tensile process.During the entire tensile fracture process,the amplitude signals of samples with different V-notches are mainly distributed between 40-70 dB,only a small amount of high-amplitude signals appear during the entire plastic deformation process,and the high amplitude signals of 100 dB appear at the moment of fracture for all samples.The accumulated count and accumulated energy of acoustic emission increase with the accumulation of damage.In addition,TC4 titanium alloy samples with different V-notches exhibit obvious stage characteristics in the accumulated energy and accumulated count curves of acoustic emission from elastic deform-ation stage to fracture stage,the slopes of the curves are similar,and the values of accumulated count and accumulated energy are similar.

关 键 词：V型缺口 TC4钛合金 拉伸 声发射 特征参数 

分 类 号：TH142.2[一般工业技术—材料科学与工程]