Experimental Investigation on Dynamic Properties of Materials
Author(s):
Yogesh B. Jadhav, Ganesh V. Bhujbal
Keywords:
dynamic stiffness; damping factor; FRF function; FFT analyzer; FEA modeling; crash testing.
Abstract
The dynamic properties of materials are important in various applications such as FEA modeling in crash testing of automotive vehicles. Properties of human liver in crash test can be finding out by natural frequency of silicone rubber as silicone rubber having nearly same properties of human liver. The natural frequencies of any system can be determined experimentally by FRF method using impact hammer. Further, these natural frequencies and FRF function can be utilized to obtain the dynamic stiffness and damping factor of the material. This methodology can be utilized to find out dynamic material properties of soft tissues such as liver, kidney etc. In the field of biomedical engineering it necessary to investigate human organ injury due to high speed impact or collision such as car accident. Smooth sil-910 having dynamic properties closely equal to human liver. So, the properties of human liver can be determined by finding dynamic properties of silicon rubber. Different samples of silicon material are prepared by keeping diameter constant and varying length and keeping length constant and varying diameter. The study of frequency as a function of length and diameter was carried out by using FFT analyzer. Frequency vs Area Ratio and frequency vs length graphs were plotted. As area ratio of specimen increases the frequency of specimen also increases and at certain point although area ratio increases frequency remains constant. Hence, in this case we find minimum area ratio for constant frequency. In second case as the length of specimen increases the frequency decreases and at threshold length it become constant. We can find optimum length for maximum frequency.
Article Details
Unique Paper ID: 166170

Publication Volume & Issue: Volume 11, Issue 2

Page(s): 238 - 244
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