STRETCH BENDING OF ALUMINUM EXTRUSIONS: EFFECT OF TENSILE SEQUENCE
STRETCH BENDING OF ALUMINUM EXTRUSIONS: EFFECT OF TENSILE SEQUENCE
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DOI：
10.1061/(asce)0733-9399(1999)125:5(521
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发表时间：
1999-05
期刊：
影响因子：
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通讯作者：
A. Clausen;O. Hopperstad;M. Langseth
中科院分区：
文献类型：
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作者：
A. Clausen;O. Hopperstad;M. Langseth
本文介绍了一种拉弯实验研究。在专用拉伸弯曲试验机上对2 m长的矩形空心截面铝合金试件进行了29次试验。在不同的拉力组合或拉伸顺序下进行测试，以研究力对某些响应参数的影响。拉弯是一种重要的工业成形工艺，模具力、下垂和回弹被认为是最相关的响应参数。试验结果表明，弯曲度对施加的拉伸顺序非常敏感。此外，还观察到下垂发展与应变演化之间的密切相关性。回弹由卸载前的拉力水平控制。最后，使用不同的恒定拉力水平进行的两次测试之间的响应差异不显著。
An experimental stretch bending study is presented in this paper. A total of 29 tests on 2 m long rectangular hollow section aluminum specimens were performed in a purpose-built stretch bending rig. The tests were carried out under different tensile force combinations, or tensile sequences, in order to investigate the influence of the force on certain response parameters. Stretch bending is an important industrial forming process, and die force, sagging, and springback are thus considered the most relevant response parameters. The tests show that the sagging is very sensitive to the applied tensile sequence. Furthermore, a close correlation between sagging development and strain evolution is observed. The springback is controlled by the tensile force level immediately before unloading. Finally, the difference in response between two tests performed with different constant, tensile force levels is insignificant.