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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Vikash Raj Shrivastava posted an Question
January 19, 2021 • 01:00 am
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30 points
30 points
- CSIR NET
- Physical Sciences
Elastic energy density in cubic crystals
ELASTIC ENERGY DENSITY IN CUBIC CRYSTALS sir derivation samjhne me problm ho rahi h
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Rohit kumar gupta![best-answer]()
Elastic energy is the mechanical potential energy stored in the configuration of a material or physical system as it is subjected to elastic deformation by work performed upon it. Elastic energy occurs when objects are impermanently compressed, stretched or generally deformed in any manner.Solids include complex crystalline materials with sometimes complicated behavior. By contrast, the behavior of compressible fluids, and especially gases, demonstrates the essence of elastic energy with negligible complication. The simple thermodynamic formula: dU=-PdV where dU is an infinitesimal change in recoverable internal energy U, P is the uniform pressure (a force per unit area) applied to the material sample of interest, and dV is the infinitesimal change in volume that corresponds to the change in internal energy. The minus sign appears because dV is negative under compression by a positive applied pressure which also increases the internal energy.