Abstract

The stress-strain state has been studied for a flange of a semiproduct made of an aluminum–copper bimetal under drawing boxes rectangular in plan. These studies are carried out using a grid method, assuming that the material is isotropic and incompressible; the deformation within each cell is uniform; the deformation occurs monotonically; and the stressed state is plane and the deformed state is bulk, but the elastic deformations are negligible. In order to minimize the measurement errors of coordinate grids and reduce the time required for processing information, a CAD software package is used for simulation The billets are rectangles with explosion-welded A4 aluminum and a M4 copper layers subjected to preliminary heat treatment before the operation of drawing. The rectangular billets have been successively drawn to a height of 10 mm; after drawing, the grid and the thickness of the sample under study are measured. The samples of billets have been photographed at an identical focal length and loaded into the application program. In the program, coordinate points are applied to the grid nodes to measure the distances and coordinates of these points before and after deformation. The measurement results show that the greatest deformation is experienced by the corner zones of the billet, where the compressive stresses exhibit an increase from the angle bisector to the walls. These stresses lead to bimetallic billet delamination, as well as to occurring corrugations throughout the copper layer. The drawing is performed for 20 billets and, in each case, the corrugation on the flange surface is observed. Varying the clamping pressure in the range from 0.25 to 0.5 MPa does not lead to any positive results. The end part of the box flange experiences the greatest strain rate, whereas, when approaching the matrix hole, the strain rate exhibits a 20% decrease. The action of angular shear stresses leads to transition-zone discontinuity, which is characterized by the presence of an intermetallic layer having reduced plastic properties.

中文翻译：

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矩形平面铝铜双金属零件拉应力状态的试验研究

摘要

在平面矩形的画框下，研究了铝-铜双金属制成的半成品法兰的应力应变状态。这些研究是使用网格法进行的，假设材料是各向同性且不可压缩的。每个单元内的变形是均匀的；变形单调发生；应力状态为平面，变形状态为体积，但弹性变形可忽略不计。为了最大程度地减少坐标网格的测量误差并减少处理信息所需的时间，使用了一个CAD软件包进行仿真。这些坯料是矩形，带有爆炸焊接的A4铝和M4铜层，在操作前进行了初步热处理图。矩形钢坯已被连续拉伸至10毫米的高度；绘制后，测量所研究样品的网格和厚度。在相同的焦距下拍摄了钢坯样品，并将其加载到应用程序中。在程序中，将坐标点应用于网格节点以测量变形前后这些点的距离和坐标。测量结果表明，坯料的拐角区域经历了最大的变形，在该区域中，压缩应力从角平分线到壁均呈现出增加的趋势。这些应力导致双金属坯料分层，并导致整个铜层出现波纹。对20个坯料进行拉伸，并在每种情况下观察法兰表面的波纹。在0.25至0的范围内变化夹紧压力。5 MPa不会导致任何正面结果。箱形法兰的端部承受最大的应变率，而当接近基体孔时，应变率下降20％。角剪应力的作用导致过渡区不连续，其特征在于存在具有降低的塑性的金属间层。