聚合物基复合材料在不同温度下的拉伸断裂强度一直是人们关注的焦点，颗粒作为一种常见增强相可以显著提高聚合物基复合材料的拉伸断裂强度。然而随着颗粒体积分数的增加，颗粒将会发生团聚现象，从而影响增强效果。针对颗粒增强聚合物基复合材料，通过计及颗粒团聚的影响，以及材料热物理性能随温度的演化，建立了一个考虑团聚影响的温度相关性拉伸断裂强度理论表征模型。模型得到了实验数据的良好验证。研究成果为定量表征不同颗粒含量、不同温度下复合材料的拉伸断裂强度提供了一种有效途径，加深了对不同温度下团聚现象对复合材料力学性能影响的认识。

The tensile fracture strength of polymer matrix composites at different temperatures have always been an important concern. As a common reinforcement phase, particles can significantly improve the tensile fracture strength of polymer matrix composites. However, with the increase of particle volume fraction, particles tend to agglomerate, which will affect the strengthening effect. For particle-reinforced polymer composites, considering the effects of particle agglomeration, as well as the evolution of the thermo-physical performance with temperature, a temperature-dependent analytical model for prediction of the tensile fracture strength of particle-reinforced polymer composites considering particle agglomeration was developed. The model predictions were in good agreement with the experimental data. The research results provide an effective way to quantitatively characterize the tensile fracture strength of composites with different particle content and temperature, and deepen the understanding of the influence of agglomeration phenomenon on the mechanical properties of composites at different temperatures.

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国家自然科学基金资助项目(12172069,12202086)。