Journal of Materials Science

, Volume 26, Issue 3, pp 621–630 | Cite as

Single and multi-specimenR-curve methods forJ IC determination of toughened nylons

  • S. Hashemi
  • J. G. Williams
Papers

Abstract

For characterization of the fracture resistance of materials used in the upper shelf toughness regime,J-R curves are widely considered the most promising candidates. However, there still remain problems concerning both the generation and measurement ofJ-R curves as material characterizing parameters and their application in ductile fracture analyses for failure prediction in polymeric materials. This paper reports the results of investigations conducted on two rubbertoughened nylons at room temperature. Two different methods ofJ-R curve determination are covered, namely multi-specimen and single specimen test methods. The resultingJ-R curves have also been evaluated to obtain values of the initiation toughness,J IC, following the extrapolation and interpolation schemes prescribed by ASTM E813-81 and ASTM E813-87 test procedures, respectively. The results show that the multiple specimen unloading method and the single specimen partial unloading compliance method can be used to generate comparable crack growth resistanceJ-R curves of the toughened nylons. The value ofJ IC for the crystalline rubber-toughened nylon was approximately twice the value obtained for the amorphous rubber-toughened nylon. The former material also exhibited a greater resistance to ductile crack growth.

Keywords

Crack Extension Resistance Curve Plane Strain Fracture Toughness Initiation Toughness Multiple Specimen 

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Copyright information

© Chapman and Hall Ltd. 1991

Authors and Affiliations

  • S. Hashemi
    • 1
  • J. G. Williams
    • 1
  1. 1.Mechanical Engineering DepartmentImperial College of Science, Technology and MedicineLondonUK

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