塑料材料破碎的新普适性分类
New universality class for the fragmentation of plastic materials
摘要：
我们提出了一个实验和理论研究的碎片的聚合物材料的球形聚丙烯颗粒的冲击对硬壁。实验表明，碎片的质量分布呈幂律，指数接近1.2，这与三维散装材料的已知指数有很大不同。介绍了一种三维离散元模型，该模型再现了聚合物在冲击过程中的大的永久变形，以及质量分布指数的新值。我们表明，剪切的裂纹形成和材料的塑性响应的主导地位是产生的新的普遍性类的破碎现象的出现的关键特征。
英文摘要：
We present an experimental and theoretical study of the fragmentation of polymeric materials by impacting polypropylene particles of spherical shape against a hard wall. Experiments reveal a power law mass distribution of fragments with an exponent close to 1.2, which is significantly different from the known exponents of three-dimensional bulk materials. A 3D discrete element model is introduced which reproduces both the large permanent deformation of the polymer during impact, and the novel value of the mass distribution exponent. We demonstrate that the dominance of shear in the crack formation and the plastic response of the material are the key features which give rise to the emergence of the novel universality class of fragmentation phenomena.
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