Abstract
Polymeric engine mounts have been widely used as vibration isolators in vehicles. In general, understanding ageing-dependent stiffness is important for life cycle design. In this paper, a new experimental procedure is developed to study the ageing mechanisms of service-aged engine mounts using digital image correlation measurements. The present contribution demonstrates that the leading factors for ageing-dependent stiffness are, not only the elastic modulus variation, but also the creep deformation and micro-structural change. The results show that pure thermal effects, such as that used to simulate ageing, leads to a uniform change in the rubber component inside the mount. This is not the same as the service-aged mount behaviour. In addition, the cross-sectional creep deformation dominates the increase in rigidity. Finally, the results suggest that micro-structural change may also lead to the stiffness variation of the mounts with high working mileage.
Highlights
Elastomeric engine mounts have been used for many years as isolators for internal combustion engines
The second part of this study focuses on how the creep deformation and micro-structural change influence the overall stiffness in a service-aged engine mount
No significant correlations between the working mileage and deformation level can be found for the same type of engine mount due to the limited sample range
Summary
Elastomeric engine mounts have been used for many years as isolators for internal combustion engines Their dynamic performance changes with operation time. This variation may not shift the resonance frequencies of the isolator that significantly, their change in performance does lead to more vibration energy being transferred into the vehicle. As a result, this variation is harmful to the overall vehicle and to the ride comfort, and is of interest to the designer. Understanding the factors that influence the elasticity of the engine mount becomes, essential, especially for a service-aged engine mount
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