Fatigue damage spectrum (FDS) calculations
Vibin Jacob
18y exp in R&D Product Dev.,Thermal System(HVAC and Powertrain cooling), NVH, Vehicle Development,Testing & EV thermal.
The "k-factor" was developed by?W?hler?to easily relate the load (ie, stress) to the life (number of cycles to failure).
The Miner's linear damage rule states that the damage fraction at a given stress level is equal to the cycle ratio. The cycle ratio is defined as the ratio of the?number of cycles at a given stress level, n, to the fatigue life in cycles at that stress level, N.
Knowing frequency response functions FRF or the power response factors (PRF) of vehicle model the calculation of vehicle response in frequency domain can be done.
The Power Spectral Density (PSD) of the road profile can be used as input value for the calculation of Power Spectral Density of the response.