期刊名称：International Journal of Energy and Environment
印刷版ISSN：2076-2895
电子版ISSN：2076-2909
出版年度：2018
卷号：9
期号：1
页码：95-102
出版社：International Energy and Environment Foundation (IEEF)
摘要：This research investigates the effect of cracks into a simply supported pipe conveying fluid on the frequency and the response of the pipe. A plastic pipe with modulus of elasticity 800 N/mm2 and dimensions of 1m length, 2cm internal diameter and 3cm external diameter used as models. A laminar flow established according to Reynold's number calculation between 500 to 1500 with a flow velocity 1 m/sec. to achieve the objectives, two techniques are used I- Analytically using the derived equation of motion for the pipe conveying fluid and the crack model is included in the stiffness of the pipe. Matlab R2016 language, a computer program has been used to solve the derived equations to predict the vibration response and to embrace the theoretical work. II-Numerical investigation is employed using the finite element method (FEM) adopting COMSOL 5.2 program to verify the analytical results. The research conveys the variation of depth and the crack positions (0.25L, 0.375L and 0.5L) where L is the pope length. It was found that the value of frequency of the pipe transmitted fluid with crack is decreased more and more when increasing the size of crack with a maximum discrepancy of (5.53%). Also, it was found that the frequency value becomes smaller when the crack position gets closer to the middle section.
