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Numerical Assessment of the Fatigue Strength of Press-Hardened Chassis Members

The fatigue strength of thick press-hardened components is predicted in this paper with a particular focus on the Heavy-Duty Vehicle industry. Transferring fatigue data from fatigue testing to components faces two major challenges: differences both in stress state and in the loaded volume. Both effects are discussed in this paper with a focus on the latter effect. To handle these issues to obtain accurate fatigue life predictions, a model for predicting the fatigue life of press hardened components is outlined and validated with experiments. The modelling consists of two parts. Firstly, the local risk of fatigue is calculated using a local effective stress criterion based on the stresses obtained from FE simulations. In a second step, the component probability of failure is calculated using so-called weakest-link theory which makes the model to account for stress concentrations and loaded volume. The framework provides probabilistic load life curves, i. e. the probability that a component will survive a given number of load cycles at a given load. The weakest-link model shows excellent agreement with component testing data and compares favorably to used comparing the stresses directly in fatigue specimen testing to the stresses in the component.

DOI Number: 10.33313/512/B0503
Product:
2024 CHS2 Conference Proceedings
PR-512-B0503
Erik Olsson, Gustaf Gustafsson
May 27, 2024
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