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首页> 外文期刊>JSME International Journal. Series A >Toughening Mechanisms of Rubber Toughened PMMA
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Toughening Mechanisms of Rubber Toughened PMMA

机译：橡胶增韧PMMA的增韧机理

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摘要

Toughening mechanisms of three types of rubber toughened poly (methyl methacrylate) (RT-PMMA) were investigated under mode I loading condition by optical and electron microscopies in conjunction with the quantitative evaluation of mode I fracture toughness. Polarizing optical microscopy clearly exhibited damage zone development ahead of a crack-tip in the RT-PMMA's. The three RT-PMMA's revealed different shapes of the damage zone. Transmission electron microscopy exhibited microcrazes generated in the equator of rubber particles within the damage zones. Extensive deformation of rubber particles corresponding to localized shear yielding of the PMMA matrix was also found in a region close to a propagating cracktip. In addition, cavitation of rubber particles was observed in the vicinity of the crack. It is therefore understood that the toughening of the RT-PMMA'S is due to energy dissipation caused by the microdamage formations such as microcrazing, matrix shear deformation and rubber particle cavitation ahead of the crack-tip.
机译：通过光学和电子显微镜，结合I型断裂韧性的定量评估，研究了I型加载条件下三种橡胶增韧型聚甲基丙烯酸甲酯（RT-PMMA）的增韧机理。偏光光学显微镜清楚地显示出在RT-PMMA裂纹尖端之前的损坏区域发展。三个RT-PMMA显示出不同形状的损坏区域。透射电子显微镜显示在损伤区域内的橡胶颗粒的赤道中产生微裂纹。在靠近裂纹尖端的区域也发现了与PMMA基体的局部剪切屈服相对应的橡胶颗粒的广泛变形。另外，在裂纹附近观察到橡胶颗粒的气穴现象。因此，可以理解，RT-PMMA'S的增韧是由于微裂纹形成（例如微裂纹，基体剪切变形和裂纹尖端之前的橡胶颗粒空化）引起的能量耗散。

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