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Scratch damage mecahnisms in model polymers

机译:模型聚合物中的刮擦损伤机制

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Fundamental scratch damage behavior in polymers was studied through investigation of a series of polycarbonate and polystyrene samples with different molecular weights. The constant load scratch test, based on a spherical indenter, was employed. Scanning electron microscopy and transmitted optical microscopy were performed to examine surface and subsurface damage during scratch. The plastic flow scratch pattern and the fracture scratch pattern are the two typical scratch patterns found in polymers. It is shown that shear yielding is the main mechanism for the plastic flow scratch pattern, while tensile-tear induced fracture on the surface and shear-induced fracture on the subsurface are the main damage mechanisms found in the fracture scratch pattern. The relationship between scratch resistance and material property relationship in polymers is discussed.
机译:通过研究具有不同分子量的一系列聚碳酸酯和聚苯乙烯样品,研究了聚合物中的基本划痕损伤行为。采用基于球形压痕的恒定负荷刮擦试验。进行扫描电子显微镜和透射光学显微镜,以检查划痕期间的表面和地下损伤。塑料流动划痕图案和断裂划痕图案是聚合物中的两个典型的划痕图案。结果表明,剪切屈服是塑料流动划痕图案的主要机理,而抗拉撕裂诱导的表面上的裂缝和剪切诱导的地下骨折是在裂缝划痕模式中发现的主要损伤机构。讨论了聚合物中耐刮擦性和材料性质关系的关系。

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