Degradation in compressive strength of silica/phenolic composites subjected to thermal and mechanical loading
Degradation in compressive strength of silica/phenolic composites subjected to thermal and mechanical loading
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DOI：
10.1177/0731684415624769
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发表时间：
2016-01
影响因子：
3.1
通讯作者：
S. Shi;Jun Liang;Liangxian Gu;Chun-lin Gong;L. Wen;Yifan Wang
中科院分区：
文献类型：
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作者：
S. Shi;Jun Liang;Liangxian Gu;Chun-lin Gong;L. Wen;Yifan Wang
当材料暴露于辐射热通量和压缩载荷时，纤维增强聚合物复合材料的机械性能会降低。建立了石英纤维增强酚醛树脂复合材料的热力学模型，预测了复合材料的压缩强度和破坏时间。该模型考虑了热质耦合传递过程、热解气体的生成及其扩散过程。在模型的制定中还考虑了基体材料的热软化、热分解和增强纤维的相变，这些都会降低材料的强度。利用该模型对酚醛树脂的热解动力学、相组分的体积分数、温度分布、抗压强度和二氧化硅/酚醛复合材料的失效时间进行了预测。将计算得到的强度随温度变化曲线与高温压缩试验实测结果进行了比较，两者吻合较好。对硅酚醛复合材料试样进行高温压缩试验后的材料断口形貌进行了分析。
Reduction to the mechanical properties of fiber-reinforced polymer composites occurs when the material is exposed to radiant heat flux and compressive loading. A thermo-mechanical model was developed to predict the compressive strength and the failure time of silica fiber-reinforced phenolic composites. The coupling heat and mass transfer processes, generation of pyrolysis gases, and their subsequent diffusion process were considered in the model. The thermal softening, thermal decomposition of the matrix material, and phase transition of the reinforced fibers, which reduce the strength of the material, were also taken into account in the formulation of the model. Pyrolysis kinetics of phenolic resin, volume fraction of phase component, temperature profile, compressive strength, and time-to-failure of silica/phenolic composites were predicted using the developed model. The calculated temperature-dependent strength curve was compared with the experimental results measured by a high-temperature compression testing, and the agreement is good. The material fracture morphology was analyzed for silica-phenolic composite specimen after high-temperature compression testing.