MULTI-OBJECTIVE OPTIMUM DESIGN FOR STRENGTH AND HEAT INSULATION OF METAL FOAM WITH DUAL-SIZE CELLULAR STRUCTURE
KOU Dongpeng; YU Jilin
CAS Key Laboratory of Mechanical Behavior and Design of Materials; University of Science and Technology of China; Hefei 230027
Cite this article:
KOU Dongpeng YU Jilin. MULTI-OBJECTIVE OPTIMUM DESIGN FOR STRENGTH AND HEAT INSULATION OF METAL FOAM WITH DUAL-SIZE CELLULAR STRUCTURE. Acta Metall Sin, 2010, 46(1): 104-110.
Finite element simulations are performed to study the steady state heat conduction of dual--size metal foams. Simulation results reveal that for a given density, the thermal conductivity of dual-size foams is higher than that of uniform cell size foam. However, the effective thermal conductivity decreases while increasing the cell radius ratio r/R in dual-size foams. A multi-objective optimum design model considering structure strength, heat insulation and light mass requirement is developed, where the objective function is obtained through polynomial fitting of the numerical results. The model is solved by the constraint method< and the optimum cell radius ratio, density and thickness of metal foam are obtained for dual-size metal foams. A comparison of the heat insulation capacity of the dual-size metal foam to the single-size metal foam having the same mass and yield strength shows that the heat insulation capacity of the former is much higher than that of the latter. Hence the dual-size foam structure is superior to that of the uniform cell foam when both load--bearing and heat insulation capacities are required.
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