Numerical simulation of residual stress field induced by laser shock processing with square spot |
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| Authors: | CAO Zi-wen CHE Zhi-gang ZOU Shi-kun FEI Qun-xing |
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| Institution: | National Key Laboratory of Science and Technology on Power Beam Processes, Beijing Aeronautical Manufacturing technology Research Institute, Beijing 100024, P. R. China |
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| Abstract: | Laser shock processing (LSP), also known as laser peening, is a novel surface treatment technique in the past few years. Compressive
residual stresses which imparted by LSP are very important for improving fatigue, corrosion and wear resistance of metals.
Finite element analysis (FEA) simulation using ABAQUS software has been applied to predict residual stresses induced by LSP
on Ti-6Al-4V titanium alloy with laser pulse duration 30 ns and water confined ablation mode. The residual stress field generated
by different shape laser spots was studied, and the square laser spot is shown the most suitability for avoiding stress lack
phenomenon and overlapping LSP. Surface residual stresses and plastically affected depth within single square spot both increased
with the increase of laser intensity and laser shock times. Furthermore, compared with circle and ellipse spot, the residual
stress distribution in overlapping square spots is very uniform only with small overlapping ratio. LSP with square spot can
process advantageous residual stress field, and this technique will be used widely. |
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| Keywords: | laser shock processing square spot Ti-6Al-4V residual stress |
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