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On-axis and off-axis compressive behavior of pultruded GFRP composites at elevated temperatures

机译：升温温度下拉挤GFRP复合材料的轴和轴外压缩行为

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摘要

In this study, the on-axis and off-axis compressive behavior of pultruded unidirectional glass fiber reinforced polymer (GFRP) coupons at elevated temperatures were investigated. The coupons with fiber orientations of 0 degrees, 30 degrees, 60 degrees and 90 degrees to the compressive loading axis were tested from 20 degrees C to 180 degrees C. The specimens under on-axis compression clearly exhibited a kinking failure mode at elevated temperatures, while the in-plain shear failure occurred in the specimens of 30 degrees and 60 degrees off-axis compression, and the out-of-plain shear failure occurred in 90 degrees off-axis specimens. The failure modes were hardly affected by the temperatures except that the GFRP skin wrinkling captured in off-axis compression specimens above 60 degrees C. As expected, the compressive strength and elastic modulus were significantly reduced with the increase in temperature. Moreover, the compressive strength of on-axis and off-axis specimens exhibited similar retention rate at each targeted temperature, while the elastic modulus of on-axis specimens showed a higher retention rate than those of off-axis specimens. The analytical studies showed that the degradation of modulus and strength of all specimens generally followed the inverse rule of mixture. In addition, the off-axis strength and elastic modulus were estimated by the Hankinson's formula.
机译：在该研究中，研究了覆盖的温度下覆盖的单向玻璃纤维增​​强聚合物（GFRP）试样的轴上和偏离轴压缩性能。用0度为0度，30度，60度和90度的纤维取向的优惠券从20摄氏度测试到180℃。在轴上压缩下的样品在升高的温度下清楚地表现出扭结的失效模式，虽然在30度和60度的轴外压缩的标本中发生平原剪切失败，但在90度的轴外标本中发生了外剪剪切失效。除了在60℃以上的轴外压缩样本中捕获的GFRP皮屑皱纹之外，失效模式几乎不会受到温度的影响。随着预期的，随着温度的增加，压缩强度和弹性模量显着降低。此外，轴上和轴外试样的抗压强度在每个靶向温度下表现出类似的保持率，而轴上标本的弹性模量显示出比偏离轴标本的保持率较高。分析研究表明，所有标本的模量和强度的降解通常遵循混合物的倒数规则。此外，汉南森的公式估计了偏离轴强度和弹性模量。

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