In a previous article I discussed using random analysis to predict failure of components in a vibration environment. Random analysis is a quick way of ensuring that statistically the maximum stress due to a vibration loading will not exceed a set level, but the most common mode of failure in such an environment is not due to one single load spike but due to the summation of damage from all the load cycles – known as fatigue failure.
Classically fatigue failure due to a transient load was performed quasi-statically. A known load history was combined with stresses from a unit load in the FEA model to create a stress time history. Rainflow cycle counting was used to evaluate the stress cycles and then damage calculated from these using classical theories like Goodman and summed using Miner’s rule. There were problems with this method though.
Ready to find out more?
Our Sales and Technical staff are available to discuss any requirement regarding our business offering, training, rental systems and support, please contact us on +44 (0) 1993 883555 or through the contact form below.