Strain rate sensitivity of homopolymer polypropylenes and micrometric wollastonite-filled polypropylene composites

被引：45

作者：

Dasari, A ^{[1
]}

Sarang, S ^{[1
]}

Misra, RDK ^{[1
]}

机构：

[1] Univ Louisiana Lafayette, Dept Chem Engn, Mat Sci & Engn Grp, Lafayette, LA 70504 USA

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2004年 / 368卷 / 1-2期

关键词：

polypropylene; strain rate sensitivity; microstructure; deformation;

D O I：

10.1016/j.msea.2003.10.299

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The strain rate sensitivity of neat polypropylene (PP) and wollastonite-mineral filled polypropylene (PP-W) and concurrent microstructural evolution is investigated. Both the materials are strain rate sensitive and the change in strain rate sensitivity index parameter with strain reflects the change in micromechanisms of deformation and modes of fracture. Deformation processes in neat polypropylene involved craze-tearing and brittle mode of fracture, while wollastonite-filled polypropylene composite was predominantly characterized by wedge, ridge-tearing, fibrillation and brittle fracture. The dependence of yield stress of neat polypropylene (PP) and wollastonite-filled polypropylene (PP-W) with strain rate follows Eyring's equation and yield similar activation volume implying similarity in the onset of plastic deformation. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：191 / 204

页数：14

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