What is difference between elastic and plastic equilibrium?

Explanation: Plastic Equilibrium: Plastic equilibrium is a state of a permanent change of soil structure when stressed further. But the elastic equilibrium is done when all the elements in a volume stretched at the same time return to normal when the stress force is not there.

What is the plasticity index of soil mean?

The plasticity index is expressed in percent of the dry weight of the soil sample. It shows the size of the range of the moisture contents at which the soil remains plastic. In general, the plasticity index depends only on the amount of clay present.

What is elastic soil?

A soil is said to be elastic when it suffers a reduction in volume (or is changed in shape and bulk) while the load is applied, but recovers its initial volume immediately the load is removed. This elastic behaviour is characteristic of peat (a type of soil). …

What is the reason for elastic deformation?

Elastic deformation can be caused by applying shear forces or tension / compression stress. In contrast, plastic deformation occurs when these stresses are sufficient to permanently deform the metal. In plastic deformation, breaking of bonds is caused by the dislocation of atoms.

What is the meaning of elastic equilibrium?

[i¦las·tik ‚ē·kwə′lib·rē·əm] (mechanics) The condition of an elastic body in which each volume element of the body is in equilibrium under the combined effect of elastic stresses and externally applied body forces.

Is plastic elastic?

The opposite of elasticity is plasticity; when something is stretched, and it stays stretched, the material is said to be plastic. Most materials have an amount of force or pressure for which they deform elastically. If more force or pressure is applied, then they have plastic deformation.

What are the elastic properties of soil?

The elastic modulus of the soil is taken as 2.62 MPa, and Poisson’s ratio is 0.4. The elastic modulus of permafrost is taken as 10.15 MPa, and Poisson’s ratio is 0.38.

What is the purpose of plasticity index?

The difference between liquid and plastic limits is called the plasticity index, and it represents the range of water content over which the soil is plastic. The plasticity index, in combination with water content at liquid limit (wL), indicates how sensitive the soil is to the changes in moisture content.

What is the importance of knowing the soil consistency?

Consistency has importance for the practical use of soils such as soil tillage and compaction by farm machinery.

What is modulus of elasticity in soil?

Modulus of elasticity of soil, commonly referred to as soil Young’s modulus, is a measure of soil stiffness. It is defined as the ratio of stress along an axis (σ a) over the strain along that axis (ϵ a) in the range of soil elastic behavior (Fig. 2).

What is the valid reason for elastic deformation in polymers?

Elastic deformation in polymers is due to Slight adjust of molecular chains.