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The crack resistance in polybutylene terephthalate (PBT) at crack initiation and during steady crack growth

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Abstract

The resistance to crack initiation and quasi-static crack propagation is investigated for a polybutylene terephthalate (PBT) using annealed and unannealed three-point bend specimens. The resistance to crack initiation (R i) is determined based on the generalized locus method which determines the resistance to crack growth including crack initiation utilizing the locus of characteristic points on the load against load-point displacement curves of specimens which differ only in initial crack length. This generalized locus method also enables us to investigate the invariance of the crack resistance value along the locus line. The steady state crack resistance (R p) during quasi-static crack propagation is determined utilizing the functional relation between total essential energy (U f) for complete fracture and the initial ligament length. The total essential energy is the sum of the blunting energy and the integration of the resistance to crack propagation with respect to the cracking area. The invariance of the crack initiation resistanceR i, and the steady state resistanceR p is discussed based on the experimental results of the annealed and unannealed specimens which show different sizes of crack tip plastic deformation.

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Authors and Affiliations

  1. Mechanical Engineering Department, University of Massachusetts, 01003, Amherst, MA, USA

    C. R. Joe & B. H. Kim

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  1. C. R. Joe
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  2. B. H. Kim
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Joe, C.R., Kim, B.H. The crack resistance in polybutylene terephthalate (PBT) at crack initiation and during steady crack growth. J Mater Sci 25, 1991–1996 (1990). https://doi.org/10.1007/BF01045754

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  • DOI: https://doi.org/10.1007/BF01045754

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