A probability finite element method used to construct
the approximate nonlinear relation between random parameters and structure
responds was supposed based on uniform design and BP neural network. Compared
with direct MonteCarlo method, this method reduced
sampled data greatly and was better to apply to the largescale engineering structure probability finite element calculation.
Fatigue failure case of diesel engine cylinder head was carried out by this
method. The fatigue reliability life was calculated and the sensitivity
analysis of 22 loading parameters such as burning pressure, bolts preloading and fuel injector preloading was
performed too. The main influencing parameters which caused cylinder head
structure fatigue failure were determined preliminarily in the end.