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Fracture of Metals, Polymers, and Glasses

Proceedings of the Fourth Symposium on Fundamental Phenomena in the Materials Sciences

  • L. J. Bonis
  • J. J. Duga
  • J. J. Gilman

Part of the Fundamental Phenomena in the Materials Sciences book series (FPMS, volume 4)

Table of contents

  1. Front Matter
    Pages i-xi
  2. T. L. Johnston
    Pages 1-22
  3. M. L. Williams
    Pages 23-32
  4. G. T. Hahn, A. R. Rosenfield
    Pages 33-43
  5. L. J. Bonis, J. J. Duga, J. J. Gilman
    Pages 107-117
  6. R. E. Mould
    Pages 119-149
  7. R. J. Stokes
    Pages 151-175
  8. C. J. McMahon Jr.
    Pages 247-284
  9. L. J. Bonis, J. J. Duga, J. J. Gilman
    Pages 285-297
  10. Back Matter
    Pages 299-310

About these proceedings

Introduction

Elucidation of the various mechanisms responsible for fracture in different materials was the general subject of the Fourth Annual Symposium on Fundamental Phenomena in the Materials Sciences held January 31 and February 1, 1966, in Boston and sponsored by the Ilikon Corporation of Natick, Massachusetts. In an analysis of the brittle-to-ductile transition in polycrystalline metals, T. L. Johnston (Ford Motor Company) placed major emphasis on factors related to the plastic resistance associated with grain boundaries and the effects of plastic anisotropy. Utilizing a generalized form of the Griffith criterion, he said it can be readily shown that several individual factors may be made reasonably quantitative and that the nature of plastic response can be predicted. Specifically, it can be shown that a critical factor relates to the length of a plastic shear zone which is constrained by an elastically loaded matrix. As this length increases, the Griffith inequality is satisfied and brittle failure occurs; however, the use of decreased grain sizes or the refine­ ment of dislocation or twin distribution can further tend to "homoge­ nize" the plastic flow and to decrease the magnitude of the shear zone. Of considerable importance in the consideration of plastic resistance is the availability of favorably oriented slip systems in aa un sheared crystallite.

Keywords

ceramics crystal distribution fatigue flow fracture glass material materials materials science mechanism metals polymer polymers quality

Editors and affiliations

  • L. J. Bonis
    • 1
  • J. J. Duga
    • 2
  • J. J. Gilman
    • 3
  1. 1.Ilikon CorporationNatickUSA
  2. 2.Battelle Memorial InstituteColumbusUSA
  3. 3.University of IllinoisChampaignUSA

Bibliographic information