Fatigue Life Prediction and Correlation of Engine Mount Elastomer Bush using A Crack Growth Approach
2022-01-0924
03/29/2022
- Event
- Content
- Abstract: In passenger car, suspension link bushings, engine and transmission mount bushings and bump-stops are made of elastomer material, to maximize the durability and comfort. Thus, deformation behavior of rubber and its durability is important for product design and development. In virtual engineering, simulating rubber fatigue is a complex exercise, as it needs right modeling strategy and coupon testing based material data. Principal stretch based Ogden model is used to characterize the hyper elastic behavior of rubber. Fatigue crack growth approach used here for the fatigue analysis. Engine torque strut mount is used to control the engine and transmission fore aft motion and it is connected between body and Power Train (PT) system. Powertrain events are predominant for damage contribution of mount failure. So, it is important to predict fatigue life of mount elastomer bush. The objective of this work is to find the fatigue life of the elastomer bush for PT loads. Virtual simulation was carried out to calculate fatigue life of elastomer bush. Static analysis was carried out for PT block cycle load to find deformation mode and then using material cracking energy density (CED) parameter were used to predict the fatigue life of elastomer bush. The estimated fatigue life is then correlated with physical test results. Based on the correlation study, improved design arrived quickly using virtual simulation. Keywords: Suspension, Elastomer, Fatigue, Engine mount, Ogden
- Citation
- Elango, C., Pandi, S., Mahadule, R., and ZARRIN-GHALAMI, T., "Fatigue Life Prediction and Correlation of Engine Mount Elastomer Bush using A Crack Growth Approach," SAE Technical Paper 2022-01-0924, 2022, .