Compressive behavior of notched and unnotched carbon woven-ply PPS thermoplastic laminates at different temperatures
Compressive behavior of notched and unnotched carbon woven-ply PPS thermoplastic laminates at different temperatures
复制标题
不同温度下有缺口和无缺口碳编织层 PPS 热塑性层压材料的压缩行为
DOI：
10.1016/j.compositesb.2017.09.027
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发表时间：
2018-01
期刊：
影响因子：
--
通讯作者：
王时玉
中科院分区：
文献类型：
--
作者：
王玥;张继鹏;张嘉振;周振功;方国栋;王时玉
有缺口和无缺口样品压缩性能的温度依赖关系对于碳织物/聚苯硫醚层压板的结构设计和应用至关重要。通过DMA和DSC分析研究了CF/PPS复合材料的热性能。在不同温度（25°C、95°C和125°C）下对缺口和未缺口试件进行压缩实验。在200°C下，也考虑了缺口试件的压缩试验。采用扫描电镜和体视显微镜观察其失效模式。结果表明，随着温度的升高，无缺口试样的抗压强度因基体软化而明显下降，模量因冷结晶而先减小后增大。缺口试件强度较未缺口试件略有下降，这可能与应力集中调节机制有关。随着温度的升高，无缺口试样出现了从刷毛到扭结带的过渡破坏模式，这与基体状态和织构特征密切相关。但缺口试件的破坏模式更为复杂，尤其是在95℃时。检测到两种不同的失效模式，可识别为临界过渡状态。
The temperature dependence of compressive behavior for notched and unnotched specimens is essential for structural design and applications of woven carbon fabric/polyphenylene sulfide (CF/PPS) laminates. Thermal properties of CF/PPS composite were studied by DMA and DSC analysis. Compressive experiments of notched and unnotched specimens at different temperatures (25 °C, 95 °C, and 125 °C) were conducted. Compressive tests for notched specimens at 200 °C were also taken into account. Failure modes were examined by scanning electron microscope (SEM) and stereomicroscope. It was found for unnotched specimens that with the increase of temperature the compressive strength exhibited an obvious decline due to the softening of matrix, while the modulus decreased initially and then increased because of the cold crystallization. For the notched specimens, the strength decreased slightly compared with that of unnotched specimens, which could be attributed to the stress concertation accommodation mechanism. There was a transition failure mode from brooming to kink band for the unnotched specimens with the increase of temperature, which were closely associated with the matrix state and weave architecture characteristics. But the notched specimens appeared more complex failure modes, especially at 95 °C. Two different failure modes were detected, which could be recognized as a critical transition state.
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