Transient response of a finite thickness strip with thermoelectric effects loaded by an electrode. (9th February 2023)

• Record Type: Journal Article
• Authors: Tian, Xiaojuan; Zhou, Yueting; Zhang, Chuanzeng
• Is Part Of: Mechanics of materials. Volume 177(2023)
• Publication Date: 2023-02-09
• Subjects: Thermoelectric materials -- Transient contact -- Finite thickness strip -- Transient heat conduction -- Laplace transform and Fourier transform; Strength of materials -- Periodicals; Mechanics, Applied -- Periodicals; Résistance des matériaux -- Périodiques; Mécanique appliquée -- Périodiques; Mechanics, Applied; Strength of materials; Periodicals; Electronic journals; 620.11
• DOI: 10.1016/j.mechmat.2023.104556
• Languages: English
• ISSNs: 0167-6636

Abstract

Abstract: Thermoelectric (TE) materials exhibiting energy converting and storing capabilities connected with an electrode are increasingly applied in engineering sciences. The contact interfaces of the TE devices are prone to gradual degradation or even failure under thermal shock loading. The investigation of the dynamic contact problem of the TE materials loaded by an electrode is significant for designing reliable TE devices. The transient frictionless contact model of the TE materials with a finite thickness indented by a rigid flat punch is proposed and investigated in this paper. The considered thermal-mechanical coupling problem is converted into the corresponding singular integral equations by the Laplace transform and the Fourier transform techniques, which are solved numerically by a collocation method. Then, the numerical inverse Laplace transform is employed to obtain the time-domain solutions. The time-dependent and thickness-dependent surface normal energy flux and surface normal contact stress, which are significant for the transient contact behavior, are computed and analyzed. The magnitudes of the transient normal energy flux and normal contact stress differ from that in the steady-state. Specifically, the normal contact stress in the transient state is higher than that in the steady-state. Graphical abstract: The three-dimensional (a) and two-dimensional (b) transient frictionless contact models of the thermoelectric (TE) strip with a finite thickness indented by a rigid flat punch. The time histories of the normalized surface energy flux (c) and the normalized surface normal contact stress (d) versus the dimensionless time for different layer thicknesses and different total energy flux loading. Image 1 Highlights: The transient contact model of the TE layer indented by an electrode is proposed. Integral transform methods translate the contact issue into integral equations. The time- and thickness-dependent surface energy flux and contact stress is computed. The contact stress in the transient state is higher than that in the steady-state. The contact stress reduces by raising Young's modulus or lowering Poisson's ratio.