Development of a Methodology for a Hysteretic Nonlinear Simulation of a Cylinder Head Gasket Joint, 03-9349

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Principal Investigator
Fernand A. Thomassy

Inclusive Dates: 09/01/02 - 01/23/03

Background - Advanced simulation techniques continue to evolve, and new techniques are being applied to all aspects of the engine design and analysis process. Complex nonlinear procedures exist to simulate the cylinder head gasket joint; however, these are rarely used because the labor and time required to generate useful results are often overwhelming. However, the cylinder head gasket remains the most frequently failed component in most engines. Advances in the formulation of finite elements have recently provided engineers with the ability to capture the hysteretic behavior of gasket material in a compact and efficient simulation. This project developed protocols to integrate gasket simulation techniques into the analysis process.

Approach - This project accomplished three tasks. First, a gasket material model was developed and implemented based on test data available from literature. This model was verified to correctly follow the hysteretic behavior of both combustion ring and gasket body materials. A detailed protocol has been established to implement and verify new material profiles for simulation. Second, the verified material models were incorporated into a comprehensive finite element model of a cylinder head assembly. Detailed protocols were established for incorporating gasket materials and for applying load and boundary conditions. Finally, the application of this new material model is verified by comparing simulations that apply the newly implemented technology with current engineering practice.

Accomplishments - This research project successfully developed procedures for the simulation and application of a nonlinear hysteretic material model for cylinder head gaskets. It was demonstrated that the hysteretic gasket model provides a more robust and efficient simulation methodology than can be achieved through the use of linear material assumptions.

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