Dynamic fracture characteristics of brass foil subjected to laser shock loading

Chao Zheng; Zhong Ji; Jie Fu; Yunhu Zhu; Libin Song; Jianhua Zhang

doi:10.1117/12.2069720

6 August 2014 Dynamic fracture characteristics of brass foil subjected to laser shock loading

Chao Zheng, Zhong Ji, Jie Fu, Yunhu Zhu, Libin Song, Jianhua Zhang

Proceedings Volume 9281, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies; 928110 (2014) https://doi.org/10.1117/12.2069720
Event: 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2014), 2014, Harbin, China

Abstract

Micro scale laser shock punching is a high strain rate micro forming method which uses the high-amplitude shock wave pressure induced by pulsed laser irradiation. The process can serve as a rapidly established and high precision technique to impress micro features on thin sheet metals. The response of brass foil under different ratio of laser beam diameter (d) to die hole diameter (D) in micro scale laser shock punching was investigated. The typical fracture surface morphologies were observed using scanning electron microscope. The influence of the ratio d/D on dynamic deformation and fracture of the brass foil was characterized. The results show that the dynamic fracture behavior of the brass foil is sensitive to the ratio d/D. According to the general mechanical analysis, the specimen fails in a shear fracture mode at d/D=1.75 due to the existence of shear stresses, while the fracture occurs in a tensile fracture mode at d/D=0.47 under the effect of bidirectional tensile stresses. In the case of d/D=0.70, the specimen fails in a mixed fracture mode under the co-action of tensile and shear stresses.

Citation Download Citation

Chao Zheng, Zhong Ji, Jie Fu, Yunhu Zhu, Libin Song, and Jianhua Zhang "Dynamic fracture characteristics of brass foil subjected to laser shock loading", Proc. SPIE 9281, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 928110 (6 August 2014); https://doi.org/10.1117/12.2069720

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