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Fatigue analysis of unidirectional GFRP composites under combined bending and torsional loads

机译：GFRP复合材料在弯曲和扭转载荷作用下的疲劳分析

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Fatigue behavior of unidirectional glass fiber reinforced polyester (GFRP) composites at room temperature under in-phase combined torsion/bending loading was investigated. All fatigue tests were carried out on constant-deflection fatigue machine with frequency of 25 Hz. A 30% reduction from the initial applied moments was taken as a failure criterion in the combined torsion/bending fatigue tests of the composite materials. A series of pure torsional fatigue tests were conducted to construct the failure contour of GFRP composites using different failure theories. The obtained S-N curves from combined torsion/bending tests were compared with both, pure torsion fatigue test results and published results of pure bending fatigue tests of GFRP rods. Pictures by scanning electron microscope were used to closely examine the failure mode of the tested specimens under combined torsion/bending loading. The results showed that, the unidirectional glass fiber reinforced polyester composites have poor torsional fatigue strength compared with the published results of pure bending fatigue strength. Endurance limit value (calculated from S-N equation at N = 10~7 cycles) of GFRP specimens tested under combined torsion/bending loading equals 8.5 times the endurance limit of pure torsion fatigue. On the other hand the endurance limit of combined torsion/bending fatigue strength approximately half the fatigue limit of pure bending fatigue strength. The predicted values of combined torsion/bending fatigue strength at different number of cycles, using the published failure theory are in good agreement with the experimental data. For the investigated range of fiber volume fractions (V_f) it was found that higher stress levels are needed to produce fatigue failure after the same number of cycles as V_f increases.
机译：研究了单向玻璃纤维增​​强聚酯（GFRP）复合材料在室温下在同相扭转/弯曲载荷作用下的疲劳行为。所有疲劳测试均在频率为25 Hz的恒定挠度疲劳机上进行。在复合材料的扭转/弯曲疲劳综合测试中，将初始施加力矩减少30％作为失效准则。进行了一系列纯扭转疲劳试验，以使用不同的破坏理论来构建GFRP复合材料的破坏轮廓。将通过组合扭转/弯曲试验获得的S-N曲线与GFRP杆的纯扭转疲劳试验结果和纯弯曲疲劳试验结果进行了比较。使用扫描电子显微镜的照片来仔细检查在组合扭转/弯曲载荷下测试样品的破坏模式。结果表明，与已发表的纯弯曲疲劳强度结果相比，单向玻璃纤维增​​强聚酯复合材料的扭转疲劳强度较差。在组合扭转/弯曲载荷下测试的GFRP试样的耐久性极限值（在N = 10〜7个循环时根据S-N方程计算）等于纯扭转疲劳耐久性极限的8.5倍。另一方面，组合的扭转/弯曲疲劳强度的耐久性极限约为纯弯曲疲劳强度的疲劳极限的一半。使用公开的失效理论，在不同循环次数下组合的扭转/弯曲疲劳强度的预测值与实验数据非常吻合。对于所研究的纤维体积分数（V_f）范围，发现在与V_f增加相同的循环次数后，需要更高的应力水平才能产生疲劳破坏。

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