Experimental Investigation into the Fatigue Damage Performance of a GRP Mortar Pipe Culvert
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EXPERIMENTAL INVESTIGATION INTO THE FATIGUE DAMAGE PERFORMANCE OF A GRP MORTAR PIPE CULVERT
H. Shi* and X. Han
Keywords: composites pipe, fatigue damage, residual stiffness, cumulative damage model The fatigue damage evolution in glass-fiber-reinforced (GRP) mortar pipes under cyclic loading were investigated. Based on the results of fatigue tests, a two-stage linear law of stiffness degradation of a glassfiber-reinforced plastic mortar pipe culvert is proposed, and a model for calculating its stiffness degradation is established. By proposing a reasonable residual stiffness calculating equation, this study intends to provide a useful method for an accurate prediction of the fatigue life and a valid long-term safety evaluation of GRP mortar pipes.
1. Introduction Glass-fiber-reinforced plastic (GRP) mortar pipes are a new type of flexible composite pipes that appeared in the 1970s. They have been broadly used in many industrial applications because of their light weight, good corrosion resistance, and high strength and stiffness. The long-term performance of pipelines is one of the focuses of scholars. In 1996, Gargiulo et al. [1] utilized four failure criteria to analyze the strength of composite pipes and concluded that the Tsai–Wu stress criterion reflected their failure situation most closely. Diniz Melo et al. [2] selected a GRP mortar pipe with a 300-mm diameter and 5.7-mm wall thickness tested it for failure under a short-time pressure and used the finite-element analysis (FEA) software to simulate and evaluate its mechanical properties. The wall material of the pipe was considered as an axisymmetric orthotropic material in the finite-element modeling. With the Tsai–Hill and Hoffman failure criteria used, the failure pressure predicted by the FEA was in good agreement with the average hydraulic failure pressure measured in the test. Yoon et al. [3] made a long-term performance prediction for GRP mortar pipes subjected to a continuous School of Civil Engineering, Hebei University of Engineering, Handan, Hebei 056038,China * Corresponding author; tel.: +86 0310 8578718; e-mail: [email protected]
Russian translation published in Mekhanika Kompozitnykh Materialov, Vol. 56, No. 5, pp. 933-944, SeptemberOctober, 2020. Original article submitted August 5, 2019; revision submitted May 18, 2020. 0191-5665/20/5605-0639 © 2020 Springer Science+Business Media, LLC
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internal pressure. Their failure pressure was predicted for 50 years by a linear regression analysis based on the data of internal pressure experiment lasting for several hours. The linear regression model was found to be good in predicting its long-term failure pressure. Rafiee et al. [4] analyzed the failure of a GRP mortar pipe under an internal hydrostatic pressure and presented a progressive damage model considering the influence of a sandwich layer. It was observed that the first-ply failure (FPF) and the function failure (FF) pressure increased linearly with thickness of the sand layer, but the relative difference between the FPF and the FF p
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