Cylinder head residual stresses
The consideration of residual stresses resulting from the manufacturing process is now part of the development work.
The residual stresses arising during stress relief annealing and subsequent quenching are strongly dependent on the heat transfer that occurs. Thus, the determination of the location- and position-dependent heat transfer coefficients is of decisive importance.
With the help of the coupled simulations, significant differences regarding water quenching or air cooling could be determined.
The three pictures show the different models that were used, starting from the overall model down to a submodel of the cylinder head. For reasons of confidentiality, no results of the analyses can be shown.