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Tensile Creep Behavior of Quasi-Unidirectional E-Glass Fabric Reinforced Polypropylene Composite

机译:准单向电子玻璃纤维增​​强聚丙烯复合材料的拉伸蠕变行为

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摘要

The present work addressed the creep behavior of quasi-unidirectional E-glass fabric reinforced polypropylene composites under off-axis tensile loading. A series of creep tests were performed on the composite at three different loading stress levels. The creep response of off-axis samples of quasi-unidirectional composites under a constant loading level can be clearly observed. A phenomenological viscoplasticity model was built for describing the creep behavior of the composite. To improve the accuracy of prediction, cyclic loading-unloading tests were adopted to determine the material constants in the model. The predicted results in terms of the strains after a load over a period of time were found to be satisfactory, compared with the experimental results. In addition, same failure mechanism was found in off-axis samples under quasi-static and creep loading cases.
机译:目前的工作解决了准单向电子玻璃纤维增​​强聚丙烯复合材料在轴外拉伸载荷下的蠕变行为。在三种不同的加载应力水平下,对复合材料进行了一系列蠕变测试。可以清楚地观察到在恒定载荷水平下准单向复合材料离轴样品的蠕变响应。建立了现象学的粘塑性模型来描述复合材料的蠕变行为。为了提高预测的准确性,采用了循环装卸试验来确定模型中的材料常数。与实验结果相比,发现在一段时间内的载荷后的应变方面的预测结果令人满意。此外,在准静态和蠕变载荷情况下,偏轴样品也发现了相同的失效机理。

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