(i) Effect of temperature:
(a) In general elasticity decreases as the temperature increases.
(b) Invar is an exception. There is no effect of temperature on elasticity of invar. Invar is a small form of invariable.
(ii) Effect of impurities:
(a) If the impurity is more elastic, the elasticity of the solid objects increases.
(b) If the purity is not more plastic, the elasticity of material decreases.
(iii) On hammering or rolling elasticity increases.
(iv) On annealing i.e. on alternate heating and cooling elasticity decreases.
It is the lack of elastic strength of a substance when subjected to repeated stresses and strain. If the substance is kept undisturbed for some time, the previous properties are restored. Thus elastic fatigue is a temporary phenomenon.
The delay in regaining the original state by a body after the removal of the deforming force is called elastic after effect.
In electrometers and galvanometers, the suspensions made from quartz and phosphor-bronze are used as the elastic after-effect is negligible in wires of these materials.
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