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在液压胀形中,为了解决管材流动应力关系构建中胀形参数求解难的现状,实现变形参数的在线、全场、非接触测量,提出了基于数字散斑相关法获取管材胀形参数方法。首先,描述了数字散斑相关法的基本原理及应用。然后,利用三维数字散斑动态应变测量分析系统和自行开发的管材自然胀形装置,分别对304不锈钢和H62黄铜管材进行了多组内压力的液压自然胀形试验,并在线获取了管材在各组内压下的变形参数,该系统变形测量精度为0.001 mm。最后,通过点云生成、三维重构、母线提取,获得各组内压力下的管材胀形轮廓方程。将所得结果与测量求解法结果的比较,相对误差均在10%之内,表明这两种求解方法具有较好的一致性,能满足管材胀形参数求解的要求。
In the hydraulic bulging, in order to solve the difficult situation of bulging parameters in the construction of the flow stress relation and to realize the on-line, full-field and non-contact measurement of deformation parameters, a method of obtaining bulging parameters of tube based on digital speckle correlation method is proposed. First of all, the basic principle and application of digital speckle correlation method are described. Then, using the three-dimensional digital speckle dynamic strain measurement and analysis system and self-developed pipe natural bulging device, a plurality of sets of internal pressure hydrostatic bulging tests were carried out on the 304 stainless steel and the H62 brass pipe respectively, Deformation parameters of each group under the pressure, the system deformation measurement accuracy of 0.001 mm. Finally, through the point cloud generation, 3D reconstruction and bus extraction, the pipe bulging contour equation under each group pressure is obtained. The relative errors between the results obtained and the results of the measurement method are within 10%, which shows that the two methods have good consistency and can meet the requirements of pipe bulging parameters.