密度是决定初始弹性模量的根本因素，而剪切变形过程中弹性模量则是密度和应力状态共同决定的。
Density is the essential factor to decide the initial elastic modulus, and the elastic modulus in shear process is the result of combined action of stress status and density.
顾名思义，这类材料在力学方向上的弹性模量及切变模量等性质随长度的变化而变化。
As the name suggests, this kind of nature and so on material in mechanics direction elasticity coefficient and shear modulus changes along with the length change.
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