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碳纤维增强PEEK树脂基复合材料的单轴时相关循环特性实验研究

, PP. 28-34

Keywords: 树脂基复合材料,PEEK,碳纤维,棘轮行为,时相关

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Abstract:

通过对碳纤维/PEEK复合材料(纤维体积分数30%)的单调拉伸、应力控制循环、应变控制循环实验,对该材料的应力、应变循环特性以及棘轮行为的率相关、时相关特性进行了系统的研究。研究表明:与PEEK树脂基体材料相比,加入碳纤维使材料的抗蠕变性能有所提高。在应变控制循环实验中,响应应力幅值与应变加载速率和应变加载幅值密切相关;在应力松弛效应的影响下,响应应力幅值随着应变峰值保持时间的增加而减小。室温下,碳纤维/PEEK复合材料在非对称应力循环中产生明显的棘轮应变,并且对加载应力幅值和平均应力具有明显的依赖性,此外,当在较低的加载速率和具有一定峰值保持时间情况下,棘轮应变显著增强。

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