CRACK PROPAGATION IN MODEL POLYETHYLENES.

B. Crist*, K. Leong-LaCava, Stephen Howard Carr

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

Abstract

Crack propagation was investigated in polyethylenes varying in molecular weight and short chain branching. Thin, single-edge notched specimens were examined under macroscopic strains in the range e equals 0 to e equals 0. 3. A definite correlation was found between the amount of plastic deformation at the crack tip, which leads to crack advance and fracture, and the strain hardening rate of the polymer as determined by tensile testing. Polyethylenes with large strain hardening rates resist both crack blunting and crack advance; strain hardening is seen to stabilize the crack. Experiments have shown that this important strain hardening parameter is enhanced in polyethylenes having high molecular weight and low crystallinity.

Original languageEnglish (US)
Pages242-248
Number of pages7
StatePublished - Dec 1 1985

ASJC Scopus subject areas

  • Engineering(all)

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