Temperature and thermal stress fields during the pulse train of long-pulse laser irradiating aluminium alloy plate

Wei Zhang; Guangyong Jin; Xiu-ying Gu

doi:10.1117/12.2072857

18 December 2014 Temperature and thermal stress fields during the pulse train of long-pulse laser irradiating aluminium alloy plate

Wei Zhang, Guangyong Jin, Xiu-ying Gu

Author Affiliations +

Proceedings Volume 9295, International Symposium on Optoelectronic Technology and Application 2014: Laser Materials Processing; and Micro/Nano Technologies; 92950K (2014) https://doi.org/10.1117/12.2072857
Event: International Symposium on Optoelectronic Technology and Application 2014, 2014, Beijing, China

Abstract

Based on Von Mises yield criterion and elasto-plastic constitutive equations, an axisymmetric finite element model of a Gaussian laser beam irradiating a metal substrate was established. In the model of finite element, the finite difference hybrid algorithm is used to solve the problem of transient temperature field and stress field. Taking nonlinear thermal and mechanical properties into account, transient distributions of temperature field and stress fields generated by the pulse train of long-pulse laser in a piece of aluminium alloy plate were computed by the model. Moreover,distributions as well as histories of temperature and stress fields were obtained. Finite element analysis software COMSOL is used to simulate the Temperature and thermal stress fields during the pulse train of long-pulse laser irradiating 7A04 aluminium alloy plate. By the analysis of the results, it is found that Mises equivalent stress on the target surface distribute within the scope of the center of a certain radius. However, the stress is becoming smaller where far away from the center. Futhermore, the Mises equivalent stress almost does not effect on stress damage while the Mises equivalent stress is far less than the yield strength of aluminum alloy targets. Because of the good thermal conductivity of 7A04 aluminum alloy, thermal diffusion is extremely quick after laser irradiate. As a result, for the multi-pulsed laser, 7A04 aluminum alloy will not produce obvious temperature accumulation when the laser frequency is less than or equal to 10 Hz. The result of this paper provides theoretical foundation not only for research of theories of 7A04 aluminium alloy and its numerical simulation under laser radiation but also for long-pulse laser technology and widening its application scope.

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Wei Zhang, Guangyong Jin, and Xiu-ying Gu "Temperature and thermal stress fields during the pulse train of long-pulse laser irradiating aluminium alloy plate", Proc. SPIE 9295, International Symposium on Optoelectronic Technology and Application 2014: Laser Materials Processing; and Micro/Nano Technologies, 92950K (18 December 2014); https://doi.org/10.1117/12.2072857

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KEYWORDS

Aluminum

Pulsed laser operation

Laser applications

Laser irradiation

Finite element methods

Laser energy

Absorption

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