CFRP方管单钉连接结构强度试验与数值模拟

STRENGTH TEST AND NUMERICAL SIMULATION OF CFRP SQUARE TUBE SINGLE-NAIL CONNECTION STRUCTURE

对四种螺栓直径不同的碳纤维层压成型方管单钉连接结构进行压缩试验,得到了连接结构的压缩极限破坏载荷和载荷-位移曲线,分别建立了基于能量演化的复合材料方管螺栓连接结构渐进损伤分析模型,模拟复合材料方管螺栓连接结构压缩载荷下的失效过程和失效模式,分析了不同螺栓直径下CFRP层合方管的孔边应力分布和损伤扩展情况。基于验证过的有限元模型,深入分析了铺层角度的变化对CFRP方管极限压缩载荷的影响。

The compression test of four kinds of carbon fiber laminated square tube single-nail connection structures with different bolt diameters was carried out, and the compressive ultimate failure load and load-displacement curve of the joint structure were obtained. The energy evolution-based composite square tube bolt connection structure was established respectively. The progressive damage analysis model simulates the failure process and failure mode of the composite square pipe joint structure under compressive load. The stress distribution and damage propagation of the CFRP laminated square tube under different bolt diameters are analyzed. Based on the verified finite element model, the influence of the change of the ply angle on the ultimate compressive load of the CFRP square tube is analyzed.