Modelling and identification of fatigue load spectra: Application in the automotive industry

This paper is focused on variable amplitude loading spectra applied in the automotive industry, more specifically for chassis system parts with respect to high cycle fatigue design. A first analytical model referred as Heuler’s considered. It of simplest use, one parameter be identified. whole identification process, based road measurement realized carmaker’s proving ground instrumented vehicles, developed and discussed. Once identified, cycles influence damage production also investigated. In light obtained results this model, a second one, noted modified introduced similar first, requires two parameters. again, process applied, lifetime accuracy assessed. new tool presented, enabling visualisation spectrum representation most less damaging cycles. Hence, methodology set legitimize gate implementation when studying spectrum.