JSME international journal. Series A, mechanics and material engineering 

About: JSME international journal. Series A, mechanics and material engineering is an academic journal. The journal publishes majorly in the area(s): Finite element method & Fracture mechanics. It has an ISSN identifier of 1340-8046. It is also open access. Over the lifetime, 305 publications have been published receiving 2040 citations.

Application of Electric Potential Method to Smart Composite Structures for Detecting Delamination

Abstract: CF/epoxy composites have been applied to many kinds of aircraft structures. The composite laminated plate compression properties, however, are easily degraded by delaminations. Thus an approach for detecting the delaminations is widely desired. In this study, an electric potential method was discussed for realtime nondestructive evaluation of delaminations because this method has several advantages in comparison with the embedded optical fiber. In order to obtain the basic properties of the CF/epoxy composites, mode I and II delamination tests were carried out and the relations between the electric resistance change and the delamination crack length were measured. As a result, the electric resistance bridge circuit approach was proven to be excellent for detecting delaminations from the inside surfaces of aircraft structures.

Domain Optimization Analysis in Linear Elastic Problems : Approach Using Traction Method

Abstract: We present a numerical analysis and results using the traction method for optimizing domains in terms of which linear elastic problems are defined. In this paper we consider the application of the traction method, which was proposed as a solution to domain optimization problems in elliptic boundary value problems. The minimization of the mean compliance is considered. Using the Lagrange multiplier method, we obtain the shape gradient functions for these domain optimization problems from the optimality criteria. In this process we consider variations in the surface force acting on the boundary and variations in the stiffness function and the body force distributed in the domain. We obtain solutions for an infinite plate with a hole and a rectangular plate clamped at both ends.

Mechanisms of fretting fatigue

Abstract: Fretting fatigue is one of the most important phenomena for inducing a dramatic reduction of fatigue strength and consequently, of unexpected failure accidents. There are numerous works on fretting fatigue. The objective of the present review is to clarify fretting fatigue mechanisms based on the vast amount of research work. A fretting fatigue crack is initiated at the highest point of tangential force on a contact surface in the very early stage of fatigue life. The tangential force is the dominant factor in enhancing crack initiation and propagation and hence, in reducing fatigue strength. Further studies on short crack and mixed-mode crack growth behavior in fretting fatigue are needed.

The Stresses and Strains in a Thick-Walled Tube for Functionally Graded Material under Uniform Thermal Loading

Abstract: The combination of materials consists of aluminium and silicon carbide particles, and the distribution profiles are assumed to be the same as the expression for the plaster/corundum model FGM material

Optimization of Material Composition to Minimize Thermal Stresses in Nonhomogeneous Plate Subjected to Unsteady Heat Supply

Abstract: For a nonhomogeneous medium, both the heat conduction equation and the governing equations of an associated thermoelastic field are nonlinear in general. Therefore, theoretical treatment of these nonlinear equations is very difficult and an exact solution is almost impossible to obtain. By introducing a laminated composite model, we derived a one dimensional temperature solution for a nonhomogeneous plate in a transient state in our previous work. In the present work, making use of this temperature solution, we describe the optimization of material composition to minimize the transient thermal stress. As a numerical example, two nonhomogeneous plates, one composed of zirconium oxide/titanium alloy and the others of alumina/ aluminum alloy, are considered. Then the optimum material composition is determined by calculation. Furthermore, the temperaturedependence of material properties is discussed.