Steady and Cyclic Thermal Stresses of Diesel Engine Pistons - A Photothermoelastic Study and Calculation 720025
A photothermoelastic analysis was used to investigate the steady thermal stresses of the pistons of 4-cycle, high-speed diesel engines, and the cyclic temperature swing of the piston surface in relation to the cyclic thermal stresses was investigated with a digital computer method.
The investigation revealed that axisymmetric analysis as an approximation was enough to estimate the steady thermal stresses, and that a major cause of the stress was the radial thermal gradient in the top of the pistons.
The cyclic temperature swing and cyclic thermal stress, calculated in connection with time-averaged heat flux, reached considerably higher value than that calculated by usually used equations of instantaneous heat-transfer coefficient.
Citation: Mihara, M., Kokubu, T., and Hirata, K., "Steady and Cyclic Thermal Stresses of Diesel Engine Pistons - A Photothermoelastic Study and Calculation," SAE Technical Paper 720025, 1972, https://doi.org/10.4271/720025. Download Citation
M. Mihara, T. Kokubu, K. Hirata
Nagasaki Technical Institute, Mitsubishi Heavy Industries, Ltd. (Japan)
1972 Automotive Engineering Congress and Exposition