The Effects of Cylinder Head Deformation and Asymmetry on Exhaust Valve Thermo-Mechanical Stresses

Paper #:
  • 981034

Published:
  • 1998-02-23
Citation:
Meyer, T. and White, R., "The Effects of Cylinder Head Deformation and Asymmetry on Exhaust Valve Thermo-Mechanical Stresses," SAE Technical Paper 981034, 1998, https://doi.org/10.4271/981034.
Pages:
11
Abstract:
A geometrically accurate, three-dimensional finite element model of a Diesel engine exhaust valve and cylinder head assembly has been developed to analyze the effect of cylinder head interactions on exhaust valve stresses. Results indicate that a multi-lobed stress pattern occurs around the exhaust valve head due to cylinder head deformation, stiffness variations, and thermal asymmetry. Consequently, peak valve bending and hoop stresses from the three-dimensional model are 48% and 40% higher, respectively, than for the two-dimensional, axisymmetric model. These results indicate the degree of model complexity required for more accurate analyses of exhaust valve operating stresses.
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