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Analysis of Proportional and Nonproportional Loading for Low Cycle Fatigue Design

[+] Author Affiliations
Takamoto Itoh

University of Fukui, Fukui, Japan

Masao Sakane

Ritsumeikan University, Kusatsu-shi, Shiga, Japan

Paper No. PVP2004-2273, pp. 19-26; 8 pages
  • ASME/JSME 2004 Pressure Vessels and Piping Conference
  • High Pressure Technology: Innovations and Advances in High Pressure Technology; 12th Annual ASME/PVPD 2004 Student Paper Competition
  • San Diego, California, USA, July 25–29, 2004
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4668-7
  • Copyright © 2004 by ASME


This paper proposes a simple method for defining uniaxial and multiaxial strain and stress states by using principal strains and stresses. It also proposes a simple method for determining the principal and shear strain/stress ranges in proportional and nonproportional loading, introducing an angle rotation of the maximum principal strain and stress. The comparison of the proposed methods and that used in the pressure vessel code in Japan was discussed. The suitability of strain and stress parameters for predicting proportional and nonproportional low fatigue lives was also discussed.

Copyright © 2004 by ASME



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