Measurement of Loss Factor and Young's Modulus of ABS and PP Specimens by Using a Speaker

It is essential to control noise and vibration in various industrial fields. In the automobile industry, various plastics have been developed and replaced metallic materials in order to reduce mass and vibration effectively. In this study, we measured and analyzed the Young’s moduli and the loss factors of Acrylonitrile butadiene styrene(ABS) and Polypropylene(PP). In order to solve the fundamental error to determine the two quantities, a loudspeaker was used instead of conventional electromagnetic devices to generate bending motion to the specimens and a laser vibrometer was also used in detection of vibration signal of the specimen. The measured Young’s moduli and loss factors of the ABS specimen were nearly constant as the temperature(-10~60 °C) was increased. The loss factor of PP specimen showed peak value at 20 °C and it means that there is glass transition for the PP specimen. Young’s modulus of PP specimen was linearly decreased as the temperature was increased.