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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part B. Journal of engineering manufacture >Further assessment of the plastic instability of thin-walled tubes in double-sided hydro-bulging process with verification experiments
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Further assessment of the plastic instability of thin-walled tubes in double-sided hydro-bulging process with verification experiments

机译：进一步评估双面水谐波过程中薄壁管的塑料不稳定性，验证实验

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摘要

An interesting process of double-sided tube hydro-bulging was proposed to provide a beneficial three-dimensional stress state in the deformation zone of the tube, so as to delay the occurrence of bursting on the tube. Previously proposed forming limit theory models with consideration of through-thickness normal stress found that the external pressure could lead to a deferred occurrence of plastic instability, but it has not been confirmed experimentally. In this article, the tensile plastic instability of tubes under double-sided pressures is further assessed based on the classical plastic instability theory. However, it is seen that the occurrence of plastic instability has not found delay when high external pressure was exerted on the outside surface of tube simultaneously, which is opposite to the previous forming limit models. In addition, an experiment investigation about double-sided tube hydro-bulging is conducted to verify the theoretical results, and the experimental results show that the external pressure has hardly any influence on forming limit strain of the 2A12 aluminum alloy tube before the occurrence of necking. Moreover, the contradiction between our results and the previously proposed forming limit theory models is that the previous models ignored the thickness item in the equilibrium equation.
机译：提出了一种双面管氢凸起的有趣过程，在管的变形区中提供有益的三维应力状态，以延迟在管上爆裂的发生。以前提出的形成极限理论模型考虑到贯穿厚度正常应力，发现外部压力可能导致延迟发生塑料不稳定，但它尚未通过实验证实。在本文中，基于经典塑料不稳定理论，进一步评估了双面压力下管的拉伸塑料不稳定性。然而，可以看出，当同时在管的外表面上施加高外部压力时，塑料不稳定性的发生延迟未发现延迟，这与先前的形成限制模型相反。此外，进行了关于双面管氢膨胀的实验研究以验证理论结果，实验结果表明，实验结果表明，外部压力几乎没有对颈缩发生前2A12铝合金管的形成限位应变的影响。此外，我们的结果与先前提出的形成限制理论模型之间的矛盾是之前的模型忽略了平衡方程中的厚度项目。

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