Moisture Absorption/Desorption Effects on Flexural Property of Glass-Fiber-Reinforced Polyester Laminates: Three-Point Bending Test and Coupled Hygro-Mechanical Finite Element Analysis
Moisture Absorption/Desorption Effects on Flexural Property of Glass-Fiber-Reinforced Polyester Laminates: Three-Point Bending Test and Coupled Hygro-Mechanical Finite Element Analysis
复制标题
吸湿/解吸对玻璃纤维增强聚酯层压板弯曲性能的影响：三点弯曲试验和耦合湿机械有限元分析
DOI：
10.3390/polym8080290
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发表时间：
2016-08-01
期刊：
影响因子：
5
通讯作者：
Bijlaard, Frans
中科院分区：
文献类型：
--
作者：
Jiang, Xu;Song, Jie;Bijlaard, Frans
研究了热湿老化条件下吸放湿对玻璃纤维增强复合材料（GFRP）层合板弯曲性能的影响。为了表征机械降解，按照ASTM测试标准（ASTM D 790 -10A）进行三点弯曲测试。在20 ° C和40 °C测试温度下，比较了干燥（0%Mt/M∞）、水分不饱和（30%Mt/M∞和50%Mt/M∞）和水分饱和（100%Mt/M∞）试样的弯曲性能。研究了玻璃纤维增强复合材料层合板在吸湿-放湿循环过程中的力学性能退化尺度和由水分扩散引起的永久损伤。实验结果证实，水分和温度的影响的组合真诚恶化的弯曲性能的GFRP层压板，在强度和刚度。此外，弯曲强度的降低百分比远大于弹性模量的降低百分比。在40 °C的测试温度下，经历一个吸湿/脱湿循环过程的GFRP层压板的弹性模量（15.0%）和弯曲强度（16.4%）的不可恢复损失是明显的，但对于20 °C的测试温度的情况则不是。此外，建立了一个湿-力耦合有限元模型，用于表征GFRP层合板在不同吸湿/脱湿阶段的力学行为，并通过弯曲试验结果验证了建模方法的有效性。
Influence of moisture absorption/desorption on the flexural properties of Glass-fibre-reinforced polymer (GFRP) laminates was experimentally investigated under hot/wet aging environments. To characterize mechanical degradation, three-point bending tests were performed following the ASTM test standard (ASTM D790-10A). The flexural properties of dry (0% Mt/M∞), moisture unsaturated (30% Mt/M∞ and 50% Mt/M∞) and moisture saturated (100% Mt/M∞) specimens at both 20 and 40 °C test temperatures were compared. One cycle of moisture absorption-desorption process was considered in this study to investigate the mechanical degradation scale and the permanent damage of GFRP laminates induced by moisture diffusion. Experimental results confirm that the combination of moisture and temperature effects sincerely deteriorates the flexural properties of GFRP laminates, on both strength and stiffness. Furthermore, the reducing percentage of flexural strength is found much larger than that of E-modulus. Unrecoverable losses of E-modulus (15.0%) and flexural strength (16.4%) for the GFRP laminates experiencing one cycle of moisture absorption/desorption process are evident at the test temperature of 40 °C, but not for the case of 20 °C test temperature. Moreover, a coupled hygro-mechanical Finite Element (FE) model was developed to characterize the mechanical behaviors of GFRP laminates at different moisture absorption/desorption stages, and the modeling method was subsequently validated with flexural test results.