Effect of CFRP/ Steel Lap Type on Performance of Lap Joint

doi:10.3969/j.issn.1008-0198.2022.06.016

Abstract

Abstract: In order to understand the influence of fiber laying direction on the properties of steel structures strengthened by CFRP, steel/steel, 0°/steel, 90°/steel, 90°/0°, 90°/90° and 0°/0° joint specimens were made, and there were 5 joint specimens of each type. Tensile shear test was carried out after 7 days of curing at room temperature and constant humidity. The failure mode, ultimate bearing capacity and load displacement curve of the specimen were investigated to explore the effect of the joint type on the performance of CFRP/ steel lap joint. The results show that the failure mode of the specimens containing 90° fibers is CFRP/ steel interface failure. The failure mode of 0°/steel specimen is CFRP/ rigid interface failure. The failure mode of 0°/0° specimens is CFRP interlayer failure. For the specimens containing 90° fiber, the shape of load-displacement curves of the same group of specimens differs greatly, and the load and displacement change nonlinearly. For the specimens containing 0° fiber, the shape of the load displacement curve of the same group of specimens is basically the same, showing a linear change. The shear strength of 0°/0° specimens is the largest, and that of 90°/90° specimens is the smallest. When sticking CFRP for reinforcement, the layering method should be chosen reasonably.

Key words: CFRP, single lap joint, interlaminar performance, impregnation adhesive, layup method

CLC Number:

TM75
TB333

GAO Youwei, LI Chuanxi, SITU Yinghu. Effect of CFRP/ Steel Lap Type on Performance of Lap Joint[J]. Hunan Electric Power, 2022, 42(6): 94-98.

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