SEDL / STP / STP813-EB / STP31825S

A Residual Strength Degradation Model for Competing Failure Modes

Whitney, JM
Materials research engineer, Nonmetallic Materials Division, Materials Laboratory, Air Force Wright Aeronautical Laboratories, Wright-Patterson Air Force Base, OH

Pages: 21    Published: Jan 1983

Download this paper for $25 PDF (248K)          View License Agreement
Abstract

A residual strength degradation model is presented which deals with both tensile and compressive strength degradation as competing failure modes. Static strength distributions are assumed to follow a two-parameter lognormal distribution, whereas the residual strength degradation equations are based on a three-parameter power law model. A procedure is outlined for determining the parameters in the model. Comparisons are made between theory and experiment for constant amplitude tension-tension and tension-compression fatigue data. Both residual tensile and residual compressive data obtained under these two load histories are considered.