Joining by die-less hydroforming with outer pressurization

Joining by die-less hydroforming with outer pressurization
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通过无模液压成形和外部加压进行连接

DOI:
10.1016/j.jajp.2020.100014
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Tekkaya
Tekkaya
中科院分区:
--
文献类型:
--
作者:
Tekkaya

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通过液压膨胀连接是一种经过充分研究的工艺,用于创建力配合和形状配合接头。为了扩大该技术的应用范围,开发了外加压无模液压成形连接工艺。在该过程中,压配合是由外部连接伙伴的弹塑性压缩引起的内部连接伙伴的弹性回弹限制的结果。所选择的材料上建立一个力配合连接的影响进行了研究,数值和实验。在本文中,引入了最大弹性应变的比值λ。当λ接近1时,干涉压力是硬化梯度差的结果,而不是有限弹性回弹的结果。当λ值接近0时,干涉压力是有限弹性回弹的结果。所获得的数值数据进行了验证与铝合金EN AW-2007与EN AW-6060和EN AW-6060 O,分别管到管连接的实验结果。
Joining by hydraulic expansion is a well-investigated process to create force- and form-fit joints. In order to extend the application possibilities of this technology, the process of joining by die-less hydroforming with outer pressurization is developed. In this process, the force-fit is a result of an elastic springback restriction of the inner joining partner, caused by an elastic-plastic compression of the outer joining partner. The influence of the chosen materials on the establishment of a force-fit connection is investigated both numerically and experimentally. In this context, the ratio of the maximum elastic strains λ is introduced. For values of λ close to 1, the interference pressure is rather a result of the difference in the hardening gradient than of a restricted elastic springback. For values of λ close to 0 in turn, the interference pressure is a result of a restricted elastic springback. The obtained numerical data is validated with the experimental results for tube-to-tube connections of the aluminum alloys EN AW-2007 with EN AW-6060 and EN AW-6060 O, respectively.
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