Abstract
In this study, the stress that generated when the first or second root of a corrugated pipe is defective is analyzed. The model is analyzed using F.E.M. code. The boundary conditions of deflection or torsion on the opposite side of the defect in the corrugated pipe are changed. The effect of the defect is evaluated using the change of the stress magnitude and the stress concentration factor(K) according to those conditions. As a result of comparing the stress magnitude, K around the flaw at the secondary root is larger than K around the flaw at the first root. Based on the position of the defect, the stress difference in the 1st root increases depending on the boundary condition of bending deflection. However, when the 2nd root is defective, the stress magnitude is similar in both cases regardless of the bending deflection. The magnitude of the stress generated in the corrugated pipe is the highest when the second root is defective. And the stress magnitude is the lowest when there is no defect. In the absence of defects, the stress gradually increases after the stress reaches the minimum value as the amount of deformation increases. However, if there is a defect, stress continues to increase, and when it passes through the plastic zone, the stress gradually increases.
Highlights
The effect of defects on machine parts or structures under load is not negligible
A lattice spring model was studied for S.I.F. of a crack tip through a machined hole [5]
Main crack created by the dynamic breakdown of the material generally do not penetrate directly, but propagate the area near the defect
Summary
The effect of defects on machine parts or structures under load is not negligible. As the evolving crack propagates near the defect, the crack path is directed toward the direction of the defect. The failure of the material follows a process in which cracking begins, propagates and fracture under external loads. Defects such as holes and cracks will affect the material's failure. Failure mechanism of defective material with varying load is very complex and it is great interest [2]. If there are crack and defects, the continuous cracks directly penetrate the defects [6]. Main crack created by the dynamic breakdown of the material generally do not penetrate directly, but propagate the area near the defect
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