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本文研究了PP/EPDM共混体脆韧转变过程中的损伤区域。首次利用计算机图像分析(CIA)来测定银纹及剪切屈服对损伤能量的贡献。并尝试用逾渗模型来处理剪切屈服区随分散相体积分数的转变,结果表明:冲击强度脆韧转变与基体由银纹转变为剪切破坏方式的机理相对应。还得到了银纹能量耗散密度(F_(cz))及剪切能量耗散密度(F_(sh))两个新参数。对于PP/EPDM共混体而言,F_(sh)约为F_(cz)的四倍,表明剪切屈服是能量耗散的有效途径。
In this paper, the damage area of PP / EPDM blends during brittle-to-ductile transition was studied. For the first time, the computer image analysis (CIA) was used to determine the contribution of silver grain and shear yield to the energy of injury. The experimental results show that the brittle-ductile transition of impact strength corresponds to the mechanism of the transition from silver grain to shear failure mode. Two new parameters of energy dissipation density (F_ (cz)) and shear energy dissipation density (F_ (sh)) were also obtained. F sh is about four times higher than F cz for PP / EPDM blends, indicating that shear yielding is an effective way to dissipate energy.