Effect of Temperature and Strain Rate on the Statistical Tensile Fracture Behavior of Metallocene Polyethylene Films

LIAO Tao; ZHANG Yi-huai; MEN Yong-feng

doi:10.14028/j.cnki.1003-3726.2026.26.197

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Effect of Temperature and Strain Rate on the Statistical Tensile Fracture Behavior of Metallocene Polyethylene Films

更新时间：2026-10-10

- Effect of Temperature and Strain Rate on the Statistical Tensile Fracture Behavior of Metallocene Polyethylene Films
- Polymer Bulletin (2026)
- 作者机构：
  
  中国科学院长春应用化学研究所高分子科学与技术全国重点实验室　长春 130022
- 作者简介：
- 基金信息：
- DOI：10.14028/j.cnki.1003-3726.2026.26.197
  CLC：
- Received：17 April 2026，
  
  Accepted：20 May 2026，
- 稿件说明：
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廖涛, 张艺怀, 门永锋. 温度和应变速率对茂金属聚乙烯薄膜拉伸断裂统计行为的影响. 高分子通报, doi: 10.14028/j.cnki.1003-3726.2026.26.197

Liao, T.; Zhang, Y. H.; Men, Y. F. Effect of temperature and strain rate on the statistical tensile fracture behavior of metallocene polyethylene films. Polym. Bull. (in Chinese), doi: 10.14028/j.cnki.1003-3726.2026.26.197
廖涛, 张艺怀, 门永锋. 温度和应变速率对茂金属聚乙烯薄膜拉伸断裂统计行为的影响. 高分子通报, doi: 10.14028/j.cnki.1003-3726.2026.26.197 DOI：

Liao, T.; Zhang, Y. H.; Men, Y. F. Effect of temperature and strain rate on the statistical tensile fracture behavior of metallocene polyethylene films. Polym. Bull. (in Chinese), doi: 10.14028/j.cnki.1003-3726.2026.26.197 DOI：

摘要

本研究探究了茂金属聚乙烯薄膜的断裂统计行为。结果表明，力学参数随拉伸温度增加而更加集中，这是因为高温下的退火作用使得微观结构更加均匀。模量和屈服应力的离散程度随应变速率提高而增大，源于结晶结构的差异在高速率下被放大。然而，高应变速率下分子链无法充分松弛以释放应力，局部的应力集中效应更为明显，使得断裂相关参数的分布更窄。在统计模型适用性方面，力学参数基本符合高斯分布，Weibull分布未必适用于模量和屈服应力，却能有效描述断裂相关的参数。Weibull函数能有效描述韧性断裂行为，暗示韧性断裂在某种程度上亦遵循“最弱连接理论”，即最终断裂由最强缺陷主导。

Abstract

This study investigates the statistical fracture behavior of metallocene polyethylene films. The results indicate that mechanical parameters become more concentrated with increasing stretching temperature

due to enhanced microstructural uniformity from the annealing effect. In contrast

the dispersion of modulus and yield stress widens with increasing strain rate due to amplified crystalline differences at high strain rates. However

at high strain rates

molecular chains cannot fully relax

causing pronounced local stress concentration

which narrows the distribution of fracture-related parameters. Regarding statistical models

mechanical parameters approximately follow a Gaussian distribution. While the Weibull distribution may not suit for modulus and yield stress

it can e

ffectively describe fracture-related parameters. The Weibull function effectively describes ductile fracture behavior

implying that

to some extent

ductile fracture also follows the “weakest-link theory”

i.e.

the final fracture is governed by the most severe defect.

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references

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