材料科学
复合材料
压缩(物理)
软化
模数
硬化(计算)
应变硬化指数
压力(语言学)
产量(工程)
泊松比
应力-应变曲线
法律工程学
泊松分布
数学
变形(气象学)
统计
语言学
哲学
图层(电子)
工程类
作者
Michael Jerabek,Zoltán Major,Reinhold W. Lang
出处
期刊:Polymer Testing
[Elsevier BV]
日期:2010-05-01
卷期号:29 (3): 302-309
被引量:63
标识
DOI:10.1016/j.polymertesting.2009.12.003
摘要
Two methods for uniaxial compression testing were investigated and compared using polypropylene as a model material. An overview of various parameters affecting compression test results is provided with particular emphasis on friction between the specimen and the compression plate. A procedure for the determination of the compressive modulus is introduced and results are shown. To enable the detection of instability associated with friction and barreling and to calculate true stress-true strain curves, the measurement of transverse expansion of the specimen at large strains is necessary. Nominal and true Poisson's ratio values in the pre- and post-yield regime are presented and the resulting true stress-true strain curves are compared and discussed. While in the post-yield regime nominal stress values misleadingly result in strain hardening, significant strain softening was observed using true stress values representing the intrinsic material behavior.
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