Fatigue Analysis in Pressure Vessel Design by Local Strain Approach: Methods and Software Requirements

[+] Author and Article Information
Arturs Kalnins

 Lehigh University, Bethlehem, PA 18015-3085ak01@Lehigh.edu

Jürgen Rudolph of the University of Dortmund, Germany, performed the calculations for this figure using ANSYS KINH linear kinematic hardening model.

This strain range was introduced by Dowling (3) who called it the effective strain range

Professor Masao Sakane of Ritsumeikan University, Shiga, Japan, pointed this out to the author.

J. Pressure Vessel Technol 128(1), 2-7 (Oct 10, 2005) (6 pages) doi:10.1115/1.2137770 History: Received August 08, 2005; Revised October 10, 2005

The purpose, methods for the analysis, software requirements, and meaning of the results of the local strain approach are discussed for fatigue evaluation of a pressure vessel or its component designed for cyclic service. Three methods that are consistent with the approach are evaluated: the cycle-by-cycle method and two half-cycle methods, twice-yield and Seeger’s. For the cycle-by-cycle method, the linear kinematic hardening model is identified as the cyclic plasticity model that produces results consistent with the local strain approach. A total equivalent strain range, which is entered on a material strain-life curve to read cycles, is defined for multiaxial stress situations

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Cycles to reach 0.5mm crack in plate and specimen by test

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Figure 2

Cycles to reach failure in plate and specimen by test

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Figure 3

Monotonic (lines only) and cyclic (markers) curves for SA-516 Grade 70 steel. L denotes longitudinal and T denotes transverse orientation of specimens machined from a plate. (Reprinted from Fig. 2 of (6), Copyright 1984, with permission from Elsevier.)

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Figure 4

Cyclic curve and calculated ranges

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Figure 5

Stabilized hysteresis loop

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Figure 6

Stabilized cycle using linear isotropic hardening model

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Figure 7

Stabilized cycle using linear kinematic hardening model

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Figure 8

Cyclic curve and calculated ranges using NLK model

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Figure 9

Calculated cycle using NLK model



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