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首页> 外文会议>International Conference on High Performance Structures and Materials >Characteristic behaviors of CFRP and GFRP at cryogenic temperature under static and cyclic loadings
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Characteristic behaviors of CFRP and GFRP at cryogenic temperature under static and cyclic loadings

机译：静态和循环载荷下冷冻温度下CFRP和GFRP的特征性行为

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Characteristic behaviors of plain-woven Carbon Fiber Reinforced Plastics (CFRP) at cryogenic temperature were investigated under static and cyclic loading. The test results were compared with those of Glass Fiber Reinforced Plastics (GFRP). Tensile behaviors of monofilaments were also evaluated. The test results showed that two knee-points appeared in the stress-strain curve of GFRP under static load, while that of CFRP was almost linear. Both strength and failure strain of the CFRP at cryogenic temperature were lower than those of CFRP at room temperature, because the epoxy resin was brittle at cryogenic temperature. At cryogenic temperature, the knee-point was also shown in the S-N curve of GFRP of the fatigue test but that was not shown in the S-N curve of CFRP. The elastic modulus of CFRP at cryogenic temperature suddenly decreased in the final stage of fatigue, while such change was not observed at room temperature. The thermal fatigue test where no cyclic loads were applied to the specimen was also conducted in order to investigate the damage progression due to temperature change. After the thermal fatigue test, the residual strength of the CFRP and GFRP were measured at room temperature. The change in residual strength was explained by the difference of the coefficient of thermal expansion. This paper also mentioned that, at cryogenic temperature, the stiffness reduction under cyclic loading was related to the local thermal stress by thermal cyclic fatigue. It should be said that the carbon fiber was failed with accompanying critical crack propagation of the matrix due to the brittle of resin at cryogenic temperature.
机译：在静态和环状载荷下研究了低温温度下仿纤维碳纤维增强塑料（CFRP）的特征性能。将测试结果与玻璃纤维增​​强塑料（GFRP）进行比较。还评估了单丝的拉伸行为。测试结果表明，在静电负载下GFRP的应力 - 应变曲线中出现了两个膝关节点，而CFRP几乎是线性的。 CFRP在低温温度下的强度和失效应变低于室温下的CFRP，因为环氧树脂在低温温度下脆。在低温温度下，还在疲劳试验GFRP的S-N曲线中显示膝关节点，但在CFRP的S-N曲线中未显示。 CFRP在低温温度下的弹性模量在疲劳的最终阶段突然下降，而在室温下未观察到这种变化。还进行了在没有循环载荷对样本施加循环载荷的热疲劳试验，以便研究由于温度变化引起的损坏进展。在热疲劳试验后，在室温下测量CFRP和GFRP的残余强度。通过热膨胀系数的差异解释了残余强度的变化。本文还提到，在低温温度下，环状负载下的刚度降低与热环疲劳的局部热应力有关。应该说碳纤维由于在低温温度下的树脂脆性而伴随着基质的临界裂纹传播。

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