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Beyond Elastic Behavior

  • S. I. Krishnamachari
Chapter
  • 156 Downloads

Abstract

Polymers are normally ductile in nature and have the capability to yield under high enough stress. Yielding, without which the material would break in a brittle manner, is helpful in structures to smooth out peak stresses and convert them into strain concentrations. Also, yielding allows sizing of a part to be done on the basis of strength of materials formulas without worrying about stress concentrations, at least initially. In plastics the distinction between yield and ultimate strength was considered unnecessary. However, the trend has changed, especially after the thermo-forming process became commercially viable. Hence, there is a clear need to understand the stress-strain relationship while yielding is in progress. In this chapter, we discuss the phenomenological aspects of yielding and another similar mode of failure called “crazing”.

Keywords

Principal Stress Stress Component Deviatoric Stress Elastic Behavior Hoop Stress 
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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References

  1. 1.
    DuPont Delrin Acetal Resin, Design Handbook, E. I. DuPont de Nemours and Co., Wilmington, DE.Google Scholar
  2. 2.
    Zytel Nylon Resin,Design Handbook, E. I. DuPont de Nemours and Co., Wilmington, DE.Google Scholar
  3. 3.
    Young, W. C., Roark’s Formulas for Stress and Strain, 6th Ed. 1989, McGraw Hill Publishing Company, New York, NY.Google Scholar
  4. 4.
    Sternstein, S. S., and Ongching, L., American Chemical Society, Polymer Preprints, 10, 1117, 1969.Google Scholar

Copyright information

© Springer Science+Business Media New York 1993

Authors and Affiliations

  • S. I. Krishnamachari
    • 1
  1. 1.L.J. Broutman & Associates, Ltd.ChicagoUSA

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