Abstract
In this study, a two-layer model is developed for simulating the homogenized elastic-viscoplastic behavior of plate-fin structures. This model consists of plate and fin layers. which are individually ruled by macroscopic constitutive models. An anisotropic, compressible power-law equation that was derived in a recent study by the present authors is used to describe the homogenized viscoplastic behavior of fin layers. On the other hand, an isotropic. incompressible power-law equation is used as the macroscopic constitutive equation of plate layers. The two-layer model developed is applied to an ultra-fine plate-fin structure made of Hastelloy X at 900℃. It is thus shown that the two-layer model is more successful especially under combined loading than the corresponding one-layer model in which plates and fins are non-separately modeled.
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