ANALYSIS OF LONGITUDINAL CRACKING MECHANISM OF GFRP PRE-TIGHTENED TEETH CONNECTION UNDER TENSILE LOAD
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摘要: 研究发现玻璃纤维复材(GFRP)拉挤管预紧力齿接头拉伸试验中会观察到纵向开裂现象,严重影响接头静态和疲劳性能。通过理论和数值模拟分析过盈量和外部拉伸荷载对接头应力状态的影响,进而解释中间GFRP管纵向开裂的机理。分析结果表明:采用内部铝套筒过盈施加预紧力的方式会导致GFRP管中出现过大的环向拉伸应力,当在GFRP管端部作用拉伸载荷时由于内部铝套筒的约束作用会进一步增大环向拉应力。对于单向纤维增强的GFRP拉挤复合材料管,其环向拉伸性能较差,故在工程中需要严格控制环向拉伸应力大小。Abstract: It was found that longitudinal cracking phenomenon could be observed in tensile fatigue test of GFRP pre-tightened teeth connection (PTTC), which seriously affected the static and fatigue properties of the joint. The mechanism of longitudinal cracking was explained from two aspects by theoretical and numerical analysis. The results showed that: the internal interference fit of aluminum sleeve and the tensile load acting on the end of GFRP tube leaded to excessive hoop tensile stress in GFRP tube. Meanwhile, under tensile load, the helix angle caused torsional shear stress in GFRP tube. For the unidirectional fiber reinforced GFRP pultrusion tube, its tensile property was poor, so the hoop tensile stress should be strictly controlled or avoided in engineering.
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Key words:
- GFRP tube /
- pre-tightened teeth connection (PTTC) /
- tensile /
- longitudinal cracking
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