Abstract
Polyethylene pipes have become to be used widely as water or gas pipes since The Great Hanshin-Awaji Earthquake. Recently, it is examined to be used polyethylene pipes as large size pipes whose diameter is about one meter. However, the value of elastic modulus of polyethylene is so small that the thickness of the pipe need to be thick in order to obtain desired stiffness of the pipe. In this result, the problem that the inner diameter of the pipe is very small is occurred. To avoid this problem, polyethylene composite pipes is made up from three layers, the material of inner-outer layer of the pipe is polyethylene and the material of layer between them is polyethylene elongated sheet which has high value of elastic modulus about thirty three times that of polyethylene. In this study, the analysis of creep behavior of this composite pipe which subjected to pressure interior of the pipe will be performed, and the velocity of total strain of the pipe are derived by using constitutive equations of creep under triaxial stress fields which obtained from the theorem of Mises-Mises type. The change in the total strain of the pipe with time is numerical calculated by incremental approach, and the effect of the volume fraction of polyethylene elongated sheet on the total strain of the pipe will be investigated.
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