Abstract
In this study, the strengthening effects of different lamination conditions on carbon fiber reinforced polymers (CFRPs) for thin-walled storage tanks (TSTs) subjected to internal pressure under dynamic loads were experimentally investigated. A total of three small-scale models of TSTs were used for the investigation, including non-strengthened specimens, specimens strengthened with 0° CFRP layers, and specimens strengthened with 0°/90° CFRP layers. There were two types of tests for every specimen: the static and dynamic tests. A new experimental method using small steel balls was applied to create internal pressure in the TSTs. The results show that small steel balls could be used to increase the internal pressure compared to a normal liquid. Furthermore, the similarity rules for small-scale TSTs with small steel balls inside were also studied to consider the applicability of the models. The experimental results indicated that the CFRP layer could effectively restrain both static and dynamic hoop strains in the TSTs. Moreover, the CFRP layer could also remarkably reduce the impact of sloshing on the TST shells. The 0° CFRP layer proved to have better effects than the 0°/90° CFRP layers on the strengthening of the TSTs against dynamic loads.
Highlights
Thin-walled storage tanks have been widely used in many fields as fluid tanks for chemical, electrical power, and food engineering, among others
Nhut and Matsumoto [32] numerically studied the strengthening effects of carbon fiber reinforced polymers (CFRPs) in various types of steel cylindrical storage tanks subjected to internal pressure under a bending shear load
The carbon fiber sheets were bonded with the shells of thin-walled storage tanks (TSTs) using E810LS epoxy via the vacuum-assisted resin transfer molding (VaRTM) method [34]
Summary
Thin-walled storage tanks have been widely used in many fields as fluid tanks for chemical, electrical power, and food engineering, among others. Bhetwal and Yamada [30] presented a novel method of strengthening thin-walled steel cylindrical shells against buckling during axial compression by coating CFRPs on both sides They discussed the effects of reinforcement and the angle of fiber orientation on the buckling strength and buckling modes of thin-walled shells using three kinds of analytical procedures: the conventional linear eigenvalue buckling analysis, the reduced stiffness buckling analysis, and the fully nonlinear numerical experiments. Nhut and Matsumoto [32] numerically studied the strengthening effects of CFRP in various types of steel cylindrical storage tanks subjected to internal pressure under a bending shear load. The strengthening effects of CFRP on TSTs impacted by sloshing were considered using two height levels of steel balls
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