Homogenised elastic–viscoplastic simulation of plate–fin structures using duplex model

摘要

In this study, a duplex model is developed as a constitutive model for the homogenised elastic–nviscoplastic behaviour of plate–fin structures. This model consists of plate and fin layers, whichnare individually ruled by different macroscopic constitutive models. An anisotropic, compressiblenpower law equation that was derived in a recent study by the present authors is used to describenthe homogenised viscoplastic behaviour of the fin layer. On the other hand, an isotropic,nincompressible power law equation is used as the macroscopic viscoplastic constitutive equationnof the plate layer. The duplex model developed is applied to an ultrafine plate–fin structure madenof Hastelloy X. It is thus shown that the duplex model is more successful in simulating thenhomogenised viscoplastic behaviour under multiaxial loading than the corresponding simplexnmodel in which plates and fins are non-separately homogenised.