Thermal fatigue on pistons induced by shaped high power laser: Part II: Design of spatial intensity distribution via numerical simulation

Song, Hong-WeiLaboratory for Laser Intelligent Manufacturing, Institute of mechanics, Chinese Academy of Sciences (författare)

Thermal fatigue on pistons induced by shaped high power laser : Part II: Design of spatial intensity distribution via numerical simulation

Validerad; 2008; 20070327 (cira)
In the laser induced thermal fatigue simulation test on pistons, the high power laser was transformed from the incident Gaussian beam into a concentric multi-circular pattern with specific intensity ratio. The spatial intensity distribution of the shaped beam, which determines the temperature field in the piston, must be designed before a diffractive optical element (DOE) can be manufactured. In this paper, a reverse method based on finite element model (FEM) was proposed to design the intensity distribution in order to simulate the thermal loadings on pistons. Temperature fields were obtained by solving a transient three-dimensional heat conduction equation with convective boundary conditions at the surfaces of the piston workpiece. The numerical model then was validated by approaching the computational results to the experimental data. During the process, some important parameters including laser absorptivity, convective heat transfer coefficient, thermal conductivity and Biot number were also validated. Then, optimization procedure was processed to find favorable spatial intensity distribution for the shaped beam, with the aid of the validated FEM. The analysis shows that the reverse method incorporated with numerical simulation can reduce design cycle and design expense efficiently. This method can serve as a kind of virtual experimental vehicle as well, which makes the thermal fatigue simulation test more controllable and predictable.

Yu, GangLaboratory for Laser Intelligent Manufacturing, Institute of mechanics, Chinese Academy of Sciences (författare)
Kaplan, AlexanderLuleå tekniska universitet,Produkt- och produktionsutveckling(Swepub:ltu)alka (författare)
Tan, Jian-SongCollege of Mechanical and Energy Engineering, Zhejiang University (författare)
Yu, Xiao-LiCollege of Mechanical and Energy Engineering, Zhejiang University (författare)
Laboratory for Laser Intelligent Manufacturing, Institute of mechanics, Chinese Academy of SciencesProdukt- och produktionsutveckling (creator_code:org_t)

Ingår i:International Journal of Heat and Mass Transfer: Elsevier BV51:3-4, s. 768-7780017-93101879-2189

Av författaren/redakt...: Song, Hong-Wei; Yu, Gang; Kaplan, Alexande ...; Tan, Jian-Song; Yu, Xiao-Li

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