Filler/matrix-debonding and micro-mechanisms of deformation in particulate filled polypropylene composites under tension
Filler/matrix-debonding and micro-mechanisms of deformation in particulate filled polypropylene composites under tension
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DOI：
10.1016/j.polymer.2010.02.033
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发表时间：
2010-04
期刊：
影响因子：
4.6
通讯作者：
M. Jerabek;Z. Major;Károly Renner;J. Móczó;B. Pukánszky;R. Lang
中科院分区：
文献类型：
--
作者：
M. Jerabek;Z. Major;Károly Renner;J. Móczó;B. Pukánszky;R. Lang
对含不同玻璃微珠和滑石粉的颗粒填充聚丙烯（PP）复合材料进行了体积应变测试，以确定其变形的微观机理。虽然在高应变率和室温下，局部空化机制（微空化、裂纹和微裂）和随后的颗粒脱粘是主要的破坏机制，但在低应变率或80°C下，观察到局部剪切屈服的贡献更显著，空化机制的贡献减少。这种主要微观变形机制的变化导致复合材料在拉伸加载期间的体积应变小于相应的整齐基体。此外，还介绍了一种利用体积应变测量来检测脱粘的新方法，该方法考虑了整齐基质聚合物和复合材料的膨胀和偏差行为。在同一试样上同时进行的声发射测量支持了这一结果。
Volume strain measurements of particulate filled polypropylene (PP) composites containing different glass beads and talc as filler were carried out in tension as a function of temperature and strain rate to determine the micro-mechanisms of deformation. While local cavitation mechanisms (micro-voiding, crazing, and micro-cracking) and subsequent debonding of the particles dominated as failure mechanisms at high strain rates and at room temperature, a more significant contribution of local shear yielding was observed with a reduced contribution of cavitational mechanisms at low strain rates or at 80°C. This change in the dominating micro-mechanisms of deformation resulted in smaller volume strains during the tensile loading of the composites than for the respective neat matrix. Moreover, a novel approach is introduced for the detection of debonding using volume strain measurements, which takes into account the dilatational and deviatoric behavior of the neat matrix polymer and the composite. The results are supported by acoustic emission measurements carried out simultaneously on the same specimens.