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Manuscript ID : JSM-2206-1747 (R1) Visit : 146 Page: 225 - 243

10.22034/jsm.2022.1962151.1747

20.1001.1.20083505.2023.15.2.8.7

Article Type: Original Research

Fracture Analysis of Several Interface Cracks in an FG Half-Plane with a Homogeneous Coating under Mixed-Mode Transient Loading

Subject Areas : Mechanics of Solids

R Bagheri 1 (Department of Mechanical Engineering, Karaj Branch, Islamic Azad University, Karaj, Iran)
M Ayatollahi 2 (Faculty of Engineering, University of Zanjan, Zanjan, Iran)
S. M Hosseini 3 (Department of Mechanical Engineering, Karaj Branch, Islamic Azad University, Karaj, Iran)
A Bagheri 4 (Department of Mathematics, Payame Noor University, Ardabil, Iran)

Received: 2023-03-28 Accepted : 2023-05-18 Published : 2023-06-01

Keywords: FGM half-plane, In-plane loading, Homogeneous coating, Several interface cracks, Dislocation Method,

Abstract :

In this paper, the mechanical fracture problem of a half-plane made of functionally graded material (FGM) with a coating of a homogeneous layer containing multiple interface cracks is investigated in order to determine the dynamic stress intensity factors (DSIFs) under transient in-plane loading. According to exponential law, the properties of functionally graded material change continuously along y-direction. Initially, integral transformations and dislocation of the Volterra type of climbing and sliding edges on the interface of a FG half-plane with a homogeneous coating leads to the numerical solution of a system with singular integral equations. These equations which have the Cauchy type-singularity are then obtained using the distributed dislocation technique (DDT). Using the inversion technique in the Laplace domain, the dislocation density on the crack faces is obtained which has led to the determination of the DSIFs. Finally, in order to show the accuracy and validity of this research, the final results in the form of graphs have been compared with other references and a very acceptable conformity has been observed. The influences of the FG parameter, coating thickness, crack length, the variation of time and the interaction between of cracks on the DSIFs are studied.

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