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최성렬,권용수,채영석 대한기계학회 1995 대한기계학회논문집 Vol.19 No.1
A parallel crack in bonded dissimilar orthotropic planes under out-of-plane loading is analyzed. The problem is formulated by Fourier integral transforms, and reduced to a pair of dual integral equations. By solving the integral equations, the asymptotic stress and displacement fields near the crack tip are determined in closed form, from which the stress intensity factor and energy release rate are obtained. Discontinuity in the stress intensity factor as the distance ratio h/a of the parallel crack approaches zero is found, while the energy releas rate is shown to be continuous at h/a = 0. This information can immediately be used to generate the stress intensity factor for the parallel crack near the interface. By employing "the maximum energy release rate criterion", it could be shown in the case of no existing crack initially that the parallel crack is formed far from the interface for the more compliant material, while it is formed close to the interface for the stiffer material. material.
최성렬,이삼동,신재균 한국섬유공학회 2004 한국섬유공학회지 Vol.41 No.4
The return spring which is one of main elements in a dobby system is often fractured during working. The failure mechanism is investigated experimentally and analytically, and the type of failure is proved as fatigue fracture by repeated loads. The fracture angle of the spring is in good agreement with the result obtained by theoretical analysis. The closed form solution related to the deflection and maximum stress is also derived, which can be applied directly to the design of the return spring.