| The methods of FEM simulation and experiment were used to investigate thestatic bore distortion of cylinder liner. The initial deformation of block upper belt ismeasured, and finite element models of cylinder block, cylinder liner, bolts and othercomponents were established with different bolt preload, were used to measure thebore distortion distribution of cylinder liner. The3-D contours of cylinder liner boredistortion were plotted. According to the belt bore distortion with a single block, thefem assembly containing cylinder block, cylinder head, gasket, cylinder liner, boltsand other parts were established. Based on the finite element simulation results, thebolt preload load distribution ratio between cylinder liner and block was obtained andthe3-D contours of cylinder liner bore distortion were plotted. The Initial deformationof block influence on cylinder liner bore distortion was investigated. Results show thatthe block initial deformation influences the liner bore distortion simulation resultsignificantly, and the block initial deformation must be considered when establishingthe FE model.Based on static experimental data, finite element model was calibrated. Thedifferent tolerances between block and cylinder liner influence on cylinder liner boredistortion was investigated. The results show that: the tolerances of the belt have aninfluence on the liner bore distortion, taking into account the two factors of expansionand contraction of the cylinder liner, there is an optimum fit tolerance band.In order to simulate the state of the liner with bolt preload and the gas pressureload, fatigue test fixture was designed and processed, and an axial alternating load wasapplied on assemblies by the high-frequency fatigue testing machine. The reliability ofthe test fixture was verified by test and cylinder liner fatigue life and fatigue safetyfactor were predicted. |
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