Measurement and Analysis on Mechanical Property of Heel Pad

• Main Authors: Ke-yue Chen, 陳克岳
• Other Authors: 周傳心
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/08969469526313109089

碩士 === 臺灣大學 === 應用力學研究所 === 95 === This research is to develop a set of mechanical model which can simulate heel pad effectively, and perform the stress relaxation experiment to get the coefficients of constitutive law using the optimization method. Then we get the EDR (energy dissipation ratio) of heel pad by mechanical model, and compare to the experiment result of the non-invasive measurement by the ultrasound . The experiment subjects are two young and non-diabetes men .First we perform the stress relaxation and EDR measurements on them, then compare the hysteresis curves and energy dissipation ratio which are simulated by the mechanical property models to EDR experiment results. The comparison results are 31.05% of experiment value and 29.37% of simulation value for subject A , and 46.27% of experiment value and 38.36%of simulation value for subject B. Finally we build a set of mechanical model which is a series of a nonlinear spring and a nonlinear vogit model to simulate the viscoelastic property of heel pad effectively. As a result, we do not need to perform the non-invasive measurement by the ultrasound to decrease cost and conform to economic benefits. The result shows that when the damping coefficients are smaller, the stress rate decreases faster and EDR becomes higher, and vice verse. When the spring coefficients are smaller, the stress rate decreases faster and the slope of hysteresis curve becomes smaller, and vice verse.