Explicit solutions for multi-layered wide plates and beams with perfect and imperfect bonding and delaminations under thermo-mechanical loading

TL;DR

This paper derives explicit, efficient solutions for the thermo-mechanical response of multi-layered plates and beams with various bonding conditions, applicable to complex, thick, and anisotropic structures with potential delaminations.

Contribution

It introduces a multiscale homogenized model providing explicit expressions for displacements and stresses in multi-layered plates with imperfect interfaces, surpassing traditional discrete-layer methods.

Findings

Accurate prediction of complex stress and displacement fields in layered plates.

Model applicability to plates with arbitrary layers and imperfect interfaces.

Validation against exact 2D thermo-elastic solutions confirms accuracy.

Abstract

Explicit expressions, for efficient application in engineering practice, are derived for generalized displacements and stresses in simply supported multi-layered wide plates and beams subjected to steady-state thermal and mechanical loading. The expressions are general and apply to plates composed of an arbitrary number of layers, of arbitrary thickness and elastic/thermal properties, and where the interfaces between the layers may be imperfect and allow relative sliding. The closed-form solutions are obtained using a multiscale homogenized model which depends on only three displacement variables and overcomes limitations of current approaches based on computationally expensive discrete-layer models. The accuracy of the expressions in predicting the highly complex and discontinuous fields, which characterize the response of thick and highly anisotropic plates with interlayer damage and delaminations, is verified using exact 2D thermo-elasticity solutions. The asymptotic limits of the model/solution correspond to the problems of an intact and a multiply delaminated plate. They are derived using a perturbation technique, which also explains the multiscale dependence of the model on the parameters.