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Crack branching and arrest in environmental cracking of polyethylene

Journal Article


Abstract


  • At intermediate K values a region where the crack speed is constant, that is, independent of K, is observed in detergent cracking of low density polyethylene. This region is terminated at high K by one of two processes: in thin specimens the crack arrests, and in thick specimens it branches. The mechanism of crack branching involves the crack front twisting and then the initiation of a new crack at the centre of the specimen. A model has been proposed to explain this mechanism and also the fact that crack arrest or branching occur at approximately the same K value. After branching the cracks continue to propagate at constant speed along paths where K| ≈ 0 and if the specimen is wide enough, can branch again. © 1986 Chapman and Hall Ltd.

UOW Authors


  •   Brown, Hugh (external author)

Publication Date


  • 1986

Citation


  • Belcher, J. L., & Brown, H. R. (1986). Crack branching and arrest in environmental cracking of polyethylene. Journal of Materials Science, 21(2), 717-724. doi:10.1007/BF01145546

Scopus Eid


  • 2-s2.0-0022659775

Web Of Science Accession Number


Start Page


  • 717

End Page


  • 724

Volume


  • 21

Issue


  • 2

Abstract


  • At intermediate K values a region where the crack speed is constant, that is, independent of K, is observed in detergent cracking of low density polyethylene. This region is terminated at high K by one of two processes: in thin specimens the crack arrests, and in thick specimens it branches. The mechanism of crack branching involves the crack front twisting and then the initiation of a new crack at the centre of the specimen. A model has been proposed to explain this mechanism and also the fact that crack arrest or branching occur at approximately the same K value. After branching the cracks continue to propagate at constant speed along paths where K| ≈ 0 and if the specimen is wide enough, can branch again. © 1986 Chapman and Hall Ltd.

UOW Authors


  •   Brown, Hugh (external author)

Publication Date


  • 1986

Citation


  • Belcher, J. L., & Brown, H. R. (1986). Crack branching and arrest in environmental cracking of polyethylene. Journal of Materials Science, 21(2), 717-724. doi:10.1007/BF01145546

Scopus Eid


  • 2-s2.0-0022659775

Web Of Science Accession Number


Start Page


  • 717

End Page


  • 724

Volume


  • 21

Issue


  • 2