ABSTRACT
The experimental investigations of the carbonblack filled SBR rubber are focused on the predeformation-and frequency-dependent material behaviour. Since the strain amplitudes are sufficient small the amplitude-dependence is not investigated. Considering the basic-stress response, which is an important part of the predeformationdependence, some quasi-static experiments are done in uniaxial tension-, compression-, and pureshear-mode. To avoid the so-called Mullins-effect (Mullins 1948, Mullins 1969), the specimen are preconditioned at first. After a relaxation period of three days they are stepwise loaded and unloaded at constant strain-amplitudes with holding times of one hour todetermine the basic stress response. Since the material is not completely relaxed after a
1 INTRODUCTION
The use of viscoelastic material in damping applications is straight forward and wide spread. In this case the ability to describe the predeformationand frequency-dependent material behaviour of filled rubber under dynamic deformations is very important, espicially for the application of engine mounts in modern car industry. Having a closer look at the mechanical load case of such engine mounts, they are loaded by a constant static predeformation caused by the mass of the engine. If the engine is running at different rpm, the constant static predeformation will be superimposed by harmonic vibrations of small amplitudes typically in a frequency range of about 10−2 Hz up to 105 Hz. Since car industry is focused on high driving comfort, it is very important to reduce the generated vibrations and prevent them from being transfered inside the car, so that the driver will not notice any vibrations of the running engine as well as any generated noise. Since the ability to simulate the material behaviour under the mentioned loading
holding time of one hour, the basic stress response is determined by calculating the tangent vectors of loading and unloading paths which belong to the same deformation. The intersection of both tangents is assumed to be the basic stress response. Figure 1 shows the experimental results for the three deformation modes uniaxial tension, compression and pure-shear.
