Abstract
AbstractAn evacuated tube collector is composed of a vacuum glass tube forged to a metal tube creating an interface which undergoes thermomechanical cyclic loading. To numerically model such a thermomechanical and geometrically non‐coherent interface, a decohesion element with mixed‐mode capability, based on a normal‐shear decomposition of the displacement discontinuity vector is used, exploiting exponential traction‐separation laws. In addition to the classical strategies, interfacial elements are allowed to have an in‐plane stretch resistance by assuming a thermohyperelastic interface Helmholtz energy, a function of the rank‐deficient interface deformation gradient $\overline{\bf F}$ and temperature $\overline{\Theta}$ , as an extension of the surface/interface elasticity theory. The nonlinear governing equations are given and solved using the finite element method. The results are illustrated through a series of numerical examples for different material parameters. (© 2014 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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