TC4钛合金板数字图像相关的受力成形破坏研究  

Study on Digital Image Correlation Forming Failure of TC4 Titanium Alloy Plate

作　　者：马时凯 王立忠 付白强 张振 MA Shi-kai;WANG Li-zhong;FU Bai-qiang;ZHANG Zhen(School of Mechanical Engineering,Xinjiang University,Xinjiang Urumqi 830046,China)

机构地区：[1]新疆大学机械工程学院,新疆乌鲁木齐830046

出　　处：《机械设计与制造》2024年第6期234-238,共5页Machinery Design & Manufacture

基　　金：国家自然科学基金资助项目(51865057)。

摘　　要：为了探究TC4钛合金板成形过程中因受尖顶力作用产生的应力集中导致板材破裂的问题。分别在常温(20℃)和100℃下,采用尖顶顶头对0.5mm厚宽120mm和宽70mm的TC4钛合金试件分别进行成形-破坏试验,利用数字图像相关法(DIC)对钛合金板材的整个成形-破坏过程进行图像采集,通过匹配计算获取钛合金板材在整个过程中的全场位移和应变云图以及相关数据,并对获取的数据进行对比分析。实验结果显示:TC4钛合金在破裂前一刻位移Y的变化趋势在垂直方向上呈现出明显的非对称性,而位移X、位移Z,位移则呈现出近似同心圆的形状;通过对获取的数据进行分析,证明温度会影响试件的应变分布;常温下破裂前一刻应变云图近似对称分布,而100℃下应变云图沿中心垂直方向呈现非对称分布。该实验为后续对TC4钛合金板材的受力分析,位移应变研究提供了有效参考。In order to explore the fracture problem of TC4 titanium alloy sheet caused by stress concentration caused by tip force in the forming process.At room temperature(20℃)and 100℃,the forming-failure tests of TC4 titanium alloy specimens with thickness of 0.5mm and width of 120mm and 70mm were carried out by using the tip head.The digital image correlation(DIC)method was used to collect the image of the whole forming-failure process of titanium alloy sheet.The full-field displacement and strain cloud images and related data of titanium alloy sheet in the whole process were obtained by matching calculation,and the obtained data were com-pared and analyzed.The experimental results show that the change trend of displacement Y of TC4 titanium alloy at the moment be-fore fracture presents obvious asymmetry in the vertical direction,while the displacement X,displacement Z and displacement present the shape of approximately concentric circle.Through the analysis of the obtained data,it is proved that the temperature will affect the strain distribution of the specimen.At room temperature,the strain nephogram was approximately symmetrically distributed at the moment before the fracture,while at 100℃,the strain nephogram was asymmetrically distributed along the vertical direction of the center.This experiment provides an effective reference for the subsequent stress analysis and displacement strain research of TC4 titani-um alloy plate.

关 键 词：TC4钛合金板材位移测量 温度 数字图像相关法 成形破坏实验 

分 类 号：TH16[机械工程—机械制造及自动化] TP394.1[自动化与计算机技术—计算机应用技术] TH74[自动化与计算机技术—计算机科学与技术]