理论上是固定组成分子的硬体的想法。直到我们如何用坚硬的身体运行，因为大多数固体对相对较小的力的功能几乎没有变形。但是，如果力足够大，我们将无法忽略变形。

（i）变形力：如果在身体上施加的力会导致身体分子的正常位置进行修饰，从而导致对象的长度，形状或体积的构型进行修改，则所施加的力在行为中变形。

(ii) Elasticity:The characteristic of a body by virtue of which the body takes its real configuration when external deforming forces are removed is known as elasticity.

（iii）弹性的原因：人体中的颗粒通过行为静电的力相互绑定。当伸长时，由于分子相互作用，键似乎像弹簧。当受到特定距离以外的压缩或小于特定的分子间分离时，分子而不是相互附着，而是由于核力量间的而相互附着。

（iv）原子间力常数（K）：原子质力常数被描述为原子间力与原子间距离的修饰之比。k =杨的模量 *原子间距离

(v) Perfectly Elastic Body:A body which gets its actual configuration immediately and completely after the removal of deforming force from it, is known as perfectly elastic body. Phosphor bronze and quartz are the types of nearly perfectly elastic materials. Liquid glasses an kind of perfectly plastic object.

（vi）完美的塑料身体：在去除变形力时根本无法获得其真实配置的对象，但是变形力可以是一个完美的塑料主体。

（vii）压力：Stress is calculated by the deforming force per unit normal area.

由于力的作用，可以分为三个类别

（a）伸长伸长的拉伸应力是沿着单个方向在身体上工作的力的答案。

(b) Shear stress, which gives "shear or bending" being the result of same and opposite torque about the origin of mass operating on a body.

(c) Volume stress (Bulk Stress) which produces a change in the volume of the body - the resulting strain is known as volume strain (Bulk Strain).

（d）压力单位=f/a = n/m²

(e) Dimension of stress = ML^-1T^-2

(viii) STRAIN:当将变形力施加到身体上时，身体的大小会发生变化。该对象称为紧张或变形。维度与原始维度的修饰之比称为应变。IE。

Strain =Change in dimension/Original dimenstion

Strain being the ratio of two similar values, so it has no units and size. There are three kinds of strain

(九)弹性极限:Elastic limit is the upper limit of deforming force up to which, if deforming force is replaced, the object regains its real form completely and after that limit, if deforming force is increased, the object loses its characteristic of elasticity and gains permanently deformed.

Elastic limit is the property of a body whereas elasticity is the property of the material of a body.

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