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Journal of Materials Science

, Volume 13, Issue 5, pp 1093–1098 | Cite as

Growth criteria for solvent crazes

  • Edward J. Kramer
  • Heider G. Krenz
  • Dieter G. Ast
Papers

Abstract

Single methanol crazes are grown from sharp cracks in polymethylmethacrylate. Double exposure holographic interferometry is used to determine the sequential strain energy release rates G and opening displacement profile of the craze from the initiation of growth to its cessation. The craze stress profile is determined at various points in its growth from the opening displacement profiles using a Fourier transform method. The rapid increase in G observed just before the craze ceases to grow demonstrates that craze growth criteria based on the concept of a constant critical total strain energy release rate cannot be correct. Similarly, the large stress concentration which develops just behind the craze tip at growth cessation is incompatible with the assumption that the craze grows to a length that just eliminates a stress singularity at its tip (Dugdale model). This feature, however, would be expected if sufficient methanol cannot reach the fibrils just behind the tip of the craze to plasticize them fully.

Keywords

Polymethylmethacrylate Stress Singularity Strain Energy Release Strain Energy Release Rate Growth Criterion 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman and Hall Ltd 1978

Authors and Affiliations

  • Edward J. Kramer
    • 1
  • Heider G. Krenz
    • 1
  • Dieter G. Ast
    • 1
  1. 1.Department of Materials Science and Engineering and the Materials Science CenterCornell UniversityIthacaUSA

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