Effect of laser energy on the deformation behavior in microscale laser bulge forming |
| |
Authors: | Chao Zheng Wei Wang |
| |
Institution: | Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (MOE), School of Materials Science and Engineering, Shandong University, 17923 Jingshi Road, Jinan 250061, PR China |
| |
Abstract: | Microscale laser bulge forming is a high strain rate microforming method using high-amplitude shock wave pressure induced by pulsed laser irradiation. The process can serve as a rapidly established and high precision technique to impress microfeatures on thin sheet metals and holds promise of manufacturing complex miniaturized devices. The present paper investigated the forming process using both numerical and experimental methods. The effect of laser energy on microformability of pure copper was discussed in detail. A 3D measuring laser microscope was adopted to measure deformed regions under different laser energy levels. The deformation measurements showed that the experimental and numerical results were in good agreement. With the verified simulation model, the residual stress distribution at different laser energy was predicted and analyzed. The springback was found as a key factor to determine the distribution and magnitude of the compressive residual stress. In addition, the absorbent coating and the surface morphology of the formed samples were observed through the scanning electron microscope. The observation confirmed that the shock forming process was non-thermal attributed to the protection of the absorbent coating. |
| |
Keywords: | Microscale laser bulge forming Laser shock waves Plastic deformation Residual stress distribution Absorbent coating Surface morphology |
本文献已被 ScienceDirect 等数据库收录! |