Measurements and Predictions of Steady-State and Transient Stress Distributions in a Diesel Engine Cylinder Head 1999-01-0973
A combined experimental and analytical approach was followed in this work to study stress distributions and causes of failure in diesel cylinder heads under steady-state and transient operation. Experimental studies were conducted first to measure temperatures, heat fluxes and stresses under a series of steady-state operating conditions. Furthermore, by placing high temperature strain gages within the thermal penetration depth of the cylinder head, the effect of thermal shock loading under rapid transients was studied. A comparison of our steady-state and transient measurements suggests that the steady-state temperature gradients and the level of temperatures are the primary causes of thermal fatigue in cast-iron cylinder heads. Subsequently, a finite element analysis was conducted to predict the detailed steady-state temperature and stress distributions within the cylinder head. A comparison of the predicted steady-state temperatures and stresses compared well with our measurements. Furthermore, the predicted location of the crack initiation point correlated well with experimental observations. This suggests that a validated steady-state FEM stress analysis can play a very effective role in the rapid prototyping of cast-iron cylinder heads.
Citation: Lee, K., Assanis, D., Lee, J., and Chun, K., "Measurements and Predictions of Steady-State and Transient Stress Distributions in a Diesel Engine Cylinder Head," SAE Technical Paper 1999-01-0973, 1999, https://doi.org/10.4271/1999-01-0973. Download Citation
Kyo Seung Lee, Dennis N. Assanis, Jinho Lee, Kwang Min Chun
The University of Michigan, Yonsei Univ.
International Congress & Exposition
SAE 1999 Transactions - Journal of Engines-V108-3