Characterizing the buckling behavior of cylindrical hollow and hybrid specimens by experimental upsetting tests
Characterizing the buckling behavior of cylindrical hollow and hybrid specimens by experimental upsetting tests
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通过实验镦粗试验表征圆柱形空心和混合样本的屈曲行为
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
Klaus
中科院分区：
文献类型：
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作者：
B. Behrens;Klaus
在钢铝复合锻造的研究中，大多采用镦粗试验。本文研究了影响单空心圆柱体和钢-铝混合试件镦粗屈曲行为的因素，并用两个参数表征。屈曲比用作径向方向上的零件几何形状的均匀性的测量，并且屈曲距离提供关于轴向方向上的零件几何形状的信息。空心圆筒镦粗的结果表明，镦粗的重复性取决于空心钢圆筒的壁厚。在T = 750 °C的成形温度以上，发生从模式II（双筒轮廓）到模式I（单筒轮廓）的转变。此外，它可以显示，应变速率没有影响的屈曲行为在两个镦粗的空心圆柱体以及镦粗的混合试样。钢铝混合试样镦粗成形的结果表明，随着成形温度的升高，钢壳壁厚s = 1 mm的钢铝混合试样径向成形更加均匀。此外，随着成形温度的升高，结果的分散性减小。
In the research of the compound forging of steel-aluminum parts mostly the upsetting test is used. In this paper the factors influencing the buckling behavior during the upsetting of mono hollow cylinders and hybrid steel-aluminum specimens are examined and characterized by two parameters. The buckle ratio is used as a measurement for the uniformity of the part geometry in radial direction and the buckle distance provides information about the part geometry in axial direction. The results gained by the upsetting of hollow cylinders show that the reproducibility depends on the wall thickness of the hollow steel cylinder. Above a forming temperature of T = 750 °C a transformation from mode II (double barrel profile) to mode I (single barrel profile) occurs. Furthermore, it could be shown, that the strain rate has no influence on the buckling behavior in both the upsetting of hollow cylinders as well as the upsetting of hybrid specimens. The results gained by the upsetting of hybrid steel aluminum specimens show that with increasing forming temperature the hybrid specimens with a wall thickness of the steel casing of s = 1 mm form more homogeneously in radial direction. In addition the scatter of the results decreases with increasing forming temperature.