Abstract Prior research has observed that the presence of secondary phases in metal alloys influence the failure behaviour of the bulk material, a response which varies based on secondary phase morphology and adhesion to the matrix material. Particle-reinforced polymer composites offer a material system in which variations in adhesion between the sub-phase and polymer matrix can be manipulated with relative ease. In the present study, we investigate the influence of both the particle morphology and matrix-particle interface adhesion on the spall strength of particle-reinforced polymer composites. Adhesion control was achieved using a adhesion-impeding silane treatment of the surface of micron-sized alumina particles. The composites were characterized based on their dynamic tensile (spall) failure strengths. The results showed that while particle morphology effects were minimal, the loss of surface adhesion resulted in a drastic reduction in spall strength. Fractography performed on the fracture surface of the recovered samples showed evidence of poor wetting in the silane-treated composites, confirming the role of particle adhesion in moderating this failure mode.

中文翻译：

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颗粒表面对颗粒增强聚合物基复合材料剥落强度的影响

摘要 先前的研究已经观察到，金属合金中第二相的存在会影响大块材料的失效行为，这种响应会根据第二相形态和与基体材料的附着力而变化。粒子增强聚合物复合材料提供了一种材料系统，在该系统中，子相和聚合物基体之间的粘附力变化可以相对容易地控制。在本研究中，我们研究了颗粒形态和基体-颗粒界面粘附对颗粒增强聚合物复合材料的剥落强度的影响。使用对微米级氧化铝颗粒表面进行粘附阻止硅烷处理来实现粘附控制。复合材料的特征在于它们的动态拉伸（剥落）破坏强度。结果表明，虽然颗粒形态影响很小，但表面附着力的丧失导致剥落强度的急剧下降。在回收样品的断裂表面上进行的断口分析表明，硅烷处理的复合材料润湿性较差，证实了颗粒粘附在缓和这种失效模式中的作用。