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A platform for research: civil engineering, architecture and urbanism
Numerical and experimental investigations of laser shock hydraulic microforming for thin-walled foils
Abstract This paper proposes a novel laser shock hydraulic microforming technology which employs laser-induced shock wave pressure to deform thin-walled metal foils into the large-area three-dimensional micro arrays with the liquid as the pressure transmission medium. Both numerical simulation and experimental methods were used to investigate the laser shock hydraulic microforming of pure copper foils. A finite element model was built and a method of discrete spatiotemporal Gaussian distribution laser shock wave pressure was applied in the simulation, and the experimental measurements were well consistent with the simulation results, which verifies the accuracy of the model. The dynamic forming process, as well as the deformation behaviors, including the velocity variation and strain distribution, were studied through the model. The pressure distribution equalization and the spring back during the forming process were found and discussed. In addition, the influence of the laser energy and foil thickness on the formability of thin-walled copper foils were studied. The numerical and experimental investigations have shown that this technology has a good pressure equalizing effect and can suppress or even prevent the springback of copper foils, which is suitable for the forming of large-area array micro-features.
Highlights Spring back first occurs in the central region and then affects the surroundings. Liquid can prolong the action time and equalize the shock wave pressure. Higher laser energy ensures better forming accuracy of thin-walled foils in a certain range. Thin foils have higher forming quality than thick ones under the same laser energy. The significant strain gradient occurs at the entrance of the mould cavity.
Numerical and experimental investigations of laser shock hydraulic microforming for thin-walled foils
Abstract This paper proposes a novel laser shock hydraulic microforming technology which employs laser-induced shock wave pressure to deform thin-walled metal foils into the large-area three-dimensional micro arrays with the liquid as the pressure transmission medium. Both numerical simulation and experimental methods were used to investigate the laser shock hydraulic microforming of pure copper foils. A finite element model was built and a method of discrete spatiotemporal Gaussian distribution laser shock wave pressure was applied in the simulation, and the experimental measurements were well consistent with the simulation results, which verifies the accuracy of the model. The dynamic forming process, as well as the deformation behaviors, including the velocity variation and strain distribution, were studied through the model. The pressure distribution equalization and the spring back during the forming process were found and discussed. In addition, the influence of the laser energy and foil thickness on the formability of thin-walled copper foils were studied. The numerical and experimental investigations have shown that this technology has a good pressure equalizing effect and can suppress or even prevent the springback of copper foils, which is suitable for the forming of large-area array micro-features.
Highlights Spring back first occurs in the central region and then affects the surroundings. Liquid can prolong the action time and equalize the shock wave pressure. Higher laser energy ensures better forming accuracy of thin-walled foils in a certain range. Thin foils have higher forming quality than thick ones under the same laser energy. The significant strain gradient occurs at the entrance of the mould cavity.
Numerical and experimental investigations of laser shock hydraulic microforming for thin-walled foils
Liu, Huixia (author) / Jiang, Chenkun (author) / Liu, Fei (author) / Ma, Youjuan (author) / Wang, Xiao (author)
Thin-Walled Structures ; 143
2019-05-29
Article (Journal)
Electronic Resource
English
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