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Neuber's Rule, which states that the theoretical stress concentration factor is equal to the geometric mean of the actual stress and strain concentration factors, is employed to treat the inelastic behavior of material localized around the spotweld. The stress and strain concentrations estimated by the Rule are compared with published results obtained by the finite-element method. Results show that comparable accuracy of stress-strain estimation can be obtained with Neuber's Rule at a negligible cost and effort. Treating residual stress as a prestressing of the spotweld and using Neuber's Rule to estimate the corresponding stress-strain concentration, fatigue life of a spotweld under constant-amplitude cycling is predicted. The predicted life is in agreement with published results.
fatigue, spotweld, Neuber's Rule, stress-strain concentration, residual stress
Staff Research Scientist, General Motors Research Laboratories, Warren, Mich.