Abstract Tubular components are indispensable in manufacturing industry, but when its size decreases to micro level, the formability of micro tube will become undesirable. To improve the formability of micro tube, this study suggested a novel laser shock hydroforming method. This method used laser-induced shock wave as energy source and liquid as medium to transmit pressure wave. It was the pressure wave that forced the material of micro tube to flow into the die cavity and replicated the shape of that. The dynamic forming process of micro tube was first studied by numerical means, and the numerical results agreed with experimental ones. Then, the middle section thickness of formed micro tube was researched experimentally. The results shown that the uniformity of thickness distribution was improved compared to that in quasi-static condition, and the improvement of that was analyzed by numerical means. In addition, the reason for the increase of formability was investigated in the aspect of contact stress, and numerical results confirmed that the impact of the material of micro tube on the die caused the increase in compressive stress, a phenomenon beneficial to the formability enhancement. Finally, the paper compared the deformation behaviors—deformation velocity and strain rate—with and without a die, proving that the die was one factor that contributed to the formability improvement.

中文翻译：

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新型激光冲击液压成形微管胀形的研究

摘要 管状部件在制造业中是必不可少的，但当其尺寸减小到微观水平时，微管的成型性就会变得不理想。为了提高微管的成形性，本研究提出了一种新型的激光冲击液压成形方法。该方法以激光激波为能源，以液体为介质传输压力波。正是压力波迫使微管材料流入模腔并复制其形状。首次采用数值方法研究了微管的动态成形过程，数值结果与实验结果一致。然后，对成形微管的中段厚度进行了实验研究。结果表明，与准静态条件相比，厚度分布的均匀性有所提高，并通过数值方法分析其改进。此外，从接触应力方面研究了成形性增加的原因，数值结果证实微管材料对模具的影响导致压应力增加，这种现象有利于成形性的提高。最后，该论文比较了使用和不使用模具时的变形行为——变形速度和应变率，证明模具是促进可成形性改进的一个因素。一种有利于提高成形性的现象。最后，该论文比较了使用和不使用模具时的变形行为——变形速度和应变率，证明模具是促进可成形性改进的一个因素。一种有利于提高成形性的现象。最后，该论文比较了使用和不使用模具时的变形行为——变形速度和应变率，证明模具是促进可成形性改进的一个因素。