J-Neub – Fatigue Life Calculation using Local Strain Method

Software for Local Strain Based Fatigue Crack Initiation Analysis

Fatigue failures often initiate at stress concentrations subjected to occasional or repeated local plasticity.

In the 1930’s Haigh explained the difference in performances of high tensile steel and mild steel using concepts of notch strain analysis and self-stresses. In 1961 H. Neuber produced an equation linking local stress-strain behaviour with that of the elastically-applied external conditions. This was followed by much research into local strain-based fatigue in the 1960’s and 1970’s.

Strain-based fatigue analysis tracks the local conditions of stress and strain at a notch root, taking into account the effects of prior loading which can cause residual stresses.

Since the late 1970’s and early 1980’s local strain-based fatigue analysis has become widespread in the aeronautical and automotive industry and has shown to provide excellent correlations with test results. It is applicable in a wide variety of situations but it is particularly useful in the analysis of components subjected to irregular load histories with occasional high tensile or compressive stresses. In these cases, traditional s-N analyses have been shown to produce inaccurate results.

Jesmond Engineering has 18 years of experience in the application of local strain-based fatigue. J-Neub represents the culmination of this experience and provides a simple and user-friendly interface.

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J-Neub software can be supplied off-the-shelf or can be further tailored to a customer’s requirements.