Investigation in the audible Frequency Range of magneto-sensitive Rubber

摘要

An experimental study is conducted where the prestrain dependence of magneto-sensitive rubber in the audible frequency range is studied along with the dependence of the dynamic strain amplitude, frequency and magnetic field strength. The material is natural rubber with a 33% volume particle fraction of irregularly shaped iron metal particles. The results show that with an increase in prestrain up to 1, the magnitude of the dynamic shear modulus decreases. As the prestrain further increases the rate of decrease of the magnitude subsides, indicating that the material is starting to stiffen. Furthermore, an attenuation of the magneto-sensitivity with increased prestrain is noted. As the frequency and magnetic field strengths are increased, the material stiffens. However, it softens with increased dynamic strain amplitude. The results presented here indicate that the pre-strain is an important parameter to consider when describing magneto-sensitive materials.