Abstract

A method was established for predicting the thermal mechanical fatigue strength of a cylinder head without the need for verification by engine tests. The accuracy of thermal analysis was enhanced by revising the turbulent model and physical property values used in CFD calculations to calculate the thermal boundary conditions. Thermal mechanical fatigue analysis used a material model that takes into account the kinematic hardening rule and hardness overaging, which is dependent on temperature. The analysis accuracy was also increased by changing the bolt connection model from FEM node merging to multi-point constraint connection. Engine durability tests using an actual engine were performed to verify the accuracy of this CAE prediction technology, and the results confirmed that cracks occurred at the durability test cycle predicted by CAE. This research helped eliminate the former need for verification with measured temperatures, and enabled model-based prediction of thermal mechanical fatigue strength in the design phase.

References

1. (1) Udoguchi, T.: Thermal Cycle Fatigue, Journal of the Japan Welding Society, Vol. 37, No. 6, p. 573-585, (1968) (in Japanese)
2. (2) Toda, H., Kobayashi, M.: Thermal fatigue fracture of materials, Journal of Japan Institute of Light Metals, Vol. 59, No. 6, p. 312-319, (2009) (in Japanese)
3. (3) https://turbmodels.larc.nasa.gov/backstep_val.html
4. (4) Lee, C. Y., Park, S. H., Cho, S., Lee, I.: Delayed-Detached Eddy Simulation for Optical Path Control on Backward-Facing Step Flow, Seventh International Conference on Computational Fluid Dynamics, ICCFD7-2701, (2012)
5. (5) Shih, T-H., Liou, W. W., Shabbir, A., Yang, Z., Zhu, J.: A New k-ϵ Eddy Viscosity Model for High Reynolds Number Turbulent Flows – Model Development and Validation, Computers & Fluids, Vol. 24, Issue 3, p. 227-238, (1995)
6. (6) Lee, M. G., Kim, D., Chung, K., Youn, J. R., Kang, T. J.: Combined Isotropic-Kinematic Hardening Laws with Anisotropic Back-stress Evolution for Orthotropic Fiber-Reinforced Composites, Polymers & Polymer Composites, Vol.12, No.3, (2004)
7. (7) Toda, H., Fukunaga, T., Kobayashi, M., Uesugi, K., Kobayashi, T., Yamada, T., Ooba, Y., Kakizaki, M.: Thermo-mechanical fatigue property of a surface-hardened AC4CH cast aluminum alloy, Journal of Japan Institute of Light Metals, Vol. 58, No. 6, p. 236-241, (2008) (in Japanese)
8. (8) Moizumi, K., Tezuka, H., Sato, T.: Influence of precipitation hardening and eutectic Si microstructures on thermal fatigue life of Al-Si-Mg-Cu based cast alloys, Journal of Japan Institute of Light Metals, Vol. 54, No. 6, p. 205-210, (2004) (in Japanese)
9. (9) White, C. S.: A Combined Isotropic-Kinematic Hardening Model for Large Deformation Metal Plasticity, Final Report, MTL TR 88-46, U.S. Army Material Technology Laboratory, (1988)

Author (organization or company)

• Shunsuke TAKEUCHI（Automobile Center）
• Yutaka SHIRAI（Automobile Center）
• Yoshihiro YAMAGUCHI（Automobile Center）
• Tomoaki YONENAGA（Automobile Center）
• Hidetoshi ARAI（Automobile Center）
• Tsuyoshi ITO（Automobile Center）
• Yoshiyuki SATO（Automobile Center）
• Yoshimi ISHII（Automobile Center）
• Tetsuya MIYASHITA（SOLIZE Engineering Corporation）

Publication Information

Article of Honda R&D Technical Review Vol.31 No.2 (56 - 63)

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