Fatigue design criteria for pressure vessel steels are developed herein based on analysis of available material data between room temperature and 427 C (800 F). Strain-controlled low-cycle and high-cycle fatigue data for austenitic steels, alloy 800, alloy 600, and alloy 718 were evaluated. The effects of mean stresses were considered and design curves were proposed for use in Sections III and VIII of the ASME Boiler and Pressure Vessel Code.

This paper describes a method for calculating stresses and deflections in perforated plates with a triangular penetration pattern.The method is based partly on theory and partly on experiment.Average ligament stresses are obtained from purely theoretical considerations but effective elastic constants and peak stresses are derived from strain measurements and photoelastic tests. Acceptable limits for pressure stresses and thermal stresses in heat-exchanger tube sheets are also proposed. Journal of Engineering for IndustryAUGUST 1 96 2 / 307 Copyright © 1962 by ASME Downloaded From: http://manufacturingscience.asmedigitalcollection.asme.org/ on 09/16/2013 Terms of Use: http://asme.org/terms Journal of Engineering for Industry AUGUST 1 96 2 / 309 Downloaded From: http://manufacturingscience.asmedigitalcollection.asme.org/ on 09/16/2013 Terms of Use: http://asme.org/terms Journal of Engineering for Industry AUGUST 1 96 2 / 311 Downloaded From: http://manufacturingscience.asmedigitalcollection.asme.org/ on 09/16/2013 Terms of Use: http://asme.org/terms

An exact formulation is presented of the relationship between the effective elastic constants for thick perforated plates (generalized plane strain) and thin perforated plates (plane stress). Extensive numerical results covering a wide range of ligament efficiencies and Poisson’s ratios are given for plates with square and triangular penetration patterns.

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A rigorous method of bounding both the total accumulated strain and the strain ranges due to cyclic operation in the creep regime is presented. These limits can be obtained from the results of purely elastic stress analyses. The basic problem of a cylindrical vessel under internal pressure subjected to cyclic thermal stresses is solved in detail. The results are presented in graphical form suitable for design purposes.