Fatigue Life Prediction of Pultruded E-glass/Polyurethane Composites
Fatigue Life Prediction of Pultruded E-glass/Polyurethane Composites
复制标题
拉挤无碱玻璃/聚氨酯复合材料的疲劳寿命预测
DOI：
10.1177/0021998305055549
复制
发表时间：
2006
期刊：
影响因子：
--
通讯作者：
Mijia Yang
中科院分区：
文献类型：
--
作者：
P. Qiao;Mijia Yang
在本文中，对新开发的拉挤无碱玻璃/聚氨酯复合材料的拉伸疲劳行为进行了表征，并提出了一种改进的疲劳寿命预测模型，其中包括应力比、频率和平均应力作为测试参数的影响。所提出的无量纲分析与现有可用疲劳数据和当前测试数据的预测非常一致。该模型与Goodman线关系一致，具有明确的物理意义。利用该模型对无碱玻璃/聚氨酯复合材料的疲劳试验数据进行了分析，并与其他常见的无碱玻璃纤维增强塑料复合材料进行了比较。这表明无碱玻璃/聚氨酯复合材料对疲劳更加敏感，但其疲劳行为与其他纤维增强塑料复合材料相当。研究并讨论了应力比、频率和平均应力对E-玻璃/聚氨酯复合材料疲劳寿命的影响。为拉挤 E 玻璃/聚氨酯复合材料提供了相应的 S-N 曲线及其基于 95% 置信度的界限。本疲劳模型可作为表征各种参数对纤维增强塑料复合材料疲劳行为影响的有用工具，并为新开发的拉挤无碱玻璃/聚氨酯复合材料提供疲劳寿命预测。
In this article, the tension–tension fatigue behavior of newly developed pultruded E-glass/polyurethane composites is characterized, and an improved model for fatigue life prediction including the effects of stress ratio, frequency, and mean stress as the testing parameters is proposed. The proposed non-dimensional analysis is in good agreement with the predictions of existing available fatigue data and present testing data. The model is consistent with the Goodman line relationship and has a clear physical meaning. The fatigue test data of E-glass/polyurethane composites are analyzed using the proposed model, and they are compared with other common E-glass fiber-reinforced plastic composites. It indicates that the E-glass/polyurethane composites are more fatigue sensitive but comparable to other fiber-reinforced plastic composites in their fatigue behaviors. The effects of stress ratio, frequency, and mean stress on fatigue life of E-glass/polyurethane composites are studied and discussed. The corresponding S–N curve and its bounds based on 95% confidence are provided for the pultruded E-glass/polyurethane composites. The present fatigue model can be used as a useful tool to characterize the effects of various parameters on the fatigue behavior of fiber-reinforced plastic composites, and it provides the fatigue life prediction for newly developed pultruded E-glass/polyurethane composites.