SEDL / STP / STP515-EB / STP34688S

Fatigue Life Predicton for Weldments with Internal Cavities

van der Zanden, AM
Present and former research assistants, and professor, University of Waterloo, Waterloo, Ontario

Robins, DB
Present and former research assistants, and professor, University of Waterloo, Waterloo, Ontario

Topper, TH
Present and former research assistants, and professor, University of Waterloo, Waterloo, Ontario

Pages: 17    Published: Jan 1972

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Abstract

A method evolved for determining the local stress-strain response of notched members is extended to predict fatigue resistance of weldments with internal cavities. It is applied to both stress-relieved samples and as-received weldments. Test results from stress-relieved samples show good agreement with life predictions based on prestrained fully reversed strain controlled smooth specimen tests.

A calculation of inelastic deformations induced in the weld metal of as-received samples indicates that localized stresses will be of yield stress magnitude on the first load application. A fatigue parameter then incorporates ensuing mean stress effects. Good life predictions obtained in this application, where the local stress history is complex, demonstrate the adequacy of this method of analysis.