Fatigue-Strength-Reduction Factors for Welds in Pressure Vessels and Piping

Author:

Jaske Carl E.1

Affiliation:

1. CC Technologies Laboratories, Inc., 6141 Avery Road, Dublin, OH 43016-8761

Abstract

Fatigue-strength-reduction factors (FSRFs) are used in the design of pressure vessels and piping subjected to cyclic loading. This paper reviews the background and basis of FSRFs that are used in the ASME Boiler and Pressure Vessel Code, focusing on weld joints in Class 1 nuclear pressure vessels and piping. The ASME Code definition of FSRF is presented. Use of the stress concentration factor (SCF) and stress indices are discussed. The types of welds used in ASME Code construction are reviewed. The effects of joint configuration, welding process, cyclic plasticity, dissimilar metal joints, residual stress, post-weld heat treatment, the nondestructive inspection performed, and metallurgical factors are discussed. The current status of weld FSRFs, including their development and application, are presented. Typical fatigue data for weldments are presented and compared with the ASME Code fatigue curves and used to illustrate the development of FSRF values from experimental information. Finally, a generic procedure for determining FSRFs is proposed and future work is recommended. The five objectives of this study were as follows: 1) to clarify the current procedures for determining values of fatigue-strength-reduction factors (FSRFs); 2) to collect relevant published data on weld-joint FSRFs; 3) to interpret existing data on weld-joint FSRFs; 4) to facilitate the development of a future database of FSRFs for weld joints; and 5) to facilitate the development of a standard procedure for determining the values of FSRFs for weld joints. The main focus is on weld joints in Class 1 nuclear pressure vessels and piping. [S0094-9930(00)02703-7]

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Safety, Risk, Reliability and Quality

Reference46 articles.

1. Jaske, C. E., 1998, “Report No. 1: Interpretative Review of Weld Fatigue-Strength-Reduction and Stress-Concentration Factors,” Fatigue Strength Reduction and Stress Concentration Factors for Welds in Pressure Vessels and Piping, Bulletin 432, Welding Research Council, Inc., New York, NY.

2. Harvey, J. F., 1991, Theory and Design of Pressure Vessels, 2nd ed., Van Nostrand Reinhold, New York, NY.

3. Iida, K., and Iino, N., 1977, “Effect of Angular Distortion on Fatigue Strength of Transverse Butt Welds in High Strength Steels,” International Institute of Welding Paper XIII, pp. 827–877.

4. Anon., 1989, Standard Welding Terms and Definitions, ANSI/AWS A3.0-89, American Welding Society, Miami, FL.

5. Anon., 1994, Structural Welding Code—Steel, ANSI/AWS D1.1-94, American Welding Society, Miami, FL.

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