Homogenized elastic-viscoplastic behavior of plate-fin structures at high temperatures
M. Tsuda1, T. Asada1, N. Ohno1,2, T. Igari3
The International Conference on Computational & Experimental Engineering and Sciences, Vol.10, No.3, pp. 2-2, 2009, DOI:10.3970/icces.2009.010.097
Abstract In this study, homogenized elastic-viscoplastic behavior of plate-fin structures fabricated for compact heat exchangers is investigated. First, the homogenized behavior is numerically analyzed using a fully implicit mathematical homogenization scheme of periodic elastic-inelastic solids. A power-law creep equation is assumed to represent the viscoplasticity of base metals at high temperatures. The plate-fin structures are thus shown to exhibit significant anisotropy as well as compressibility in both the elastic and viscoplastic ranges of the homogenized behavior. Second, a non-linear rate-dependent macroscopic constitutive model is developed by utilizing the quadratic yield function proposed for anisotropic compressible plasticity. More >
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