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Thermal fatigue on pistons induced by shaped high power laser: Part II: Design of spatial intensity distribution via numerical simulation
Laboratory for Laser Intelligent Manufacturing, Institute of mechanics, Chinese Academy of Sciences.
Laboratory for Laser Intelligent Manufacturing, Institute of mechanics, Chinese Academy of Sciences.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.ORCID iD: 0000-0002-3569-6795
College of Mechanical and Energy Engineering, Zhejiang University.
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2008 (English)In: International Journal of Heat and Mass Transfer, ISSN 0017-9310, E-ISSN 1879-2189, Vol. 51, no 3-4, p. 768-778Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2008. Vol. 51, no 3-4, p. 768-778
National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-4748DOI: 10.1016/j.ijheatmasstransfer.2007.04.034ISI: 000253661600034Scopus ID: 2-s2.0-37649019878Local ID: 2bcfd970-dc83-11db-b67f-000ea68e967bOAI: oai:DiVA.org:ltu-4748DiVA, id: diva2:977622
Note
Validerad; 2008; 20070327 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Kaplan, Alexander

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