人角膜的生物力学特性

BIOMECHANICAL PROPERTIES OF HUMAN CORNEA

以人角膜为研究对象，通过建立一套规范、系统的实验方法，揭示人角膜的生物力学特性。对人角膜标本进行了单轴拉伸实验，测定了其极限强度、应力最大时的变形能及其变形能密度；循环加载实验表明应力－应变的滞后环随加载次数的增加而逐渐减小，应力－应变曲线在应力为０．１５ＭＰａ以上时能用幂指数拟合；应力松弛实验测定了应力松弛谱各参数；

The purpose of this study is to develop a careful and systematical method to investigate the biomechanical properties of human cornea. Specimens of human cornea were tested in uniaxial tension experiment. It's ultimate strength, maximum distortion energy and its density are determined. Their cyclic tensile test shows that the hysteresis decreases with each cycle. Stress-strain data was found closely fit exponential power function when stress is bigger than 0.15MPa. In the relaxation test, The parameters of relaxation spectrum were determined; the creep test shows that the generalized creep test data versus the logarithm of time presents linear relationship.