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25 September, 05:59

Define the following terms in your own words: (a) elastic strain, (b) plastic strain, (c) creep strain, (d) tensile viscosity, (e) recovery, and (f) relaxation.

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  1. 25 September, 06:10
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    Detailed Answer is given below,

    Explanation:

    (a) Elastic strain

    Elastic deformation is defined as the limit for the deformation values up to which the object will bounce and return to the original shape when the load is removed.

    When the object is subjected to an external load, it deforms. If the load exceeds the load corresponding to the elastic limit of the object, then, after removing the load, the object cannot return to its original geometric specification.

    (b) Plastic strain

    Plastic Strain is a deformation that cannot be recovered after eliminating the deforming force. In other words, if the applied tension is greater than the elastic limit of the material, there will be a permanent deformation.

    (c) Creep strain

    The deformation of the material at a higher temperature is much more than at the normal temperature known as creep.

    Subsequently, the deformation produced in heated material is called creep deformation. Creep deformation is a function of temperature.

    (d) Tensile viscosity

    Viscosity is a main parameter when measuring flux fluids, such as liquids, semi-solids, gases and even solids. Brookfield deals with liquids and semi-solids. Viscosity measurements are made together with the quality and efficiency of the product. Any person involved in the characterization of the flow, in research or development, quality control or transfer of fluids, at one time or another is involved with some kind of viscosity measurement.

    (e) Recovery

    Recovery is a process whereby deformed grains can reduce their stored energy by eliminating or reorganizing defects in their crystalline structure. These defects, mainly dislocations, are introduced by plastic deformation of the material and act to increase the elastic limit of a material.

    (f) Relaxation

    Stress relaxation occurs in polymers when they remain tense for long periods of time.

    These alloys have very good resistance to stress relaxation and, therefore, are used as spring materials.

    Stress relaxation is a gradual reduction of stress over time in constant tension.
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