Analysis On Non-Fourier Effect Of Coating And Substrate Irradiated With Intense Laser

With the ultrashort laser rapid developing in recent years, the heat transfer research in micro-scales become more and more important. Coatings are effective ways to optimize physical properties of the substrate, also coatings are widely used in computer integrated circuit board and aerospace industry. Plenty experiments show that the non-Fourier effect cannot be ignored when super quick heating in a very short time and in micro-scale.This paper based on non-Fourier Cattaneo-Vernotte equation, studies the non-Fourier effect of coatings and substrate irradiating by intense laser. The coating and substrate system is abstracted for a thin layer with a certain thickness and semi-infinite body, in this condition simplified to one-dimensional questions. The thermal and stress analytical results of a thin layer and semi-infinite body is deduced in L space, with the help of Laplace transform methods and numerical accelerating convergence inversion of integral method. The calculation is programmed in MATLAB.The main results are as follows:(1) Consider thin layer and semi-infinite body irradiated by ultra-short laser, when the laser intensity is within the scope of heating, the temperature rise with the passage of time and presents volatility obviously. The distribution of temperature field related to the relaxations time of materials, the width of incident heat flux pulse and so on. As the thermal relaxation time is greater, the non-Fourier effect is more apparent; heat pulse wider, volatility of temperature amplitude larger.(2)Under the effect of sine pulse heat flux, tensile and compressive stress will appear in the thin layer and semi-infinite body. The peak stress is in semi-infinite body at one time thickness deep away from interface, around two times of peak value at interface. By increase the thickness of thin layer, we could reduce the stress peaks in semi-infinite body, but cannot eliminate it.