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In material science, resilience is the ability of a material to absorb energy when it is deformed elastically, and release that energy upon unloading. Proof resilience is defined as the maximum energy that can be absorbed within the elastic limit, without creating a permanent distortion. The modulus of resilience is defined as the maximum energy that can be absorbed per unit volume without creating a permanent distortion. It can be calculated by integrating the stress-strain curve from zero to the elastic limit. In uniaxial tension, : where ''Ur'' is the modulus of resilience, ''σy'' is the yield strength, and ''E'' is the Young's modulus. ==Unit of resilience== Resilience (''U''r) is measured in a unit of joule per cubic metre (J·m−3) in the SI system, ''i.e.'' elastical deformation energy per volume of test specimen (merely for gage-length part). Like the unit of tensile toughness (''U''T), the unit of resilience can be easily calculated by using area underneath the stress–strain (''σ''–''ε'') curve, which gives resilience value, as given below: ''U''r = Area underneath the stress–strain (''σ''–''ε'') curve = ''1/2' 'x''σ'' x ''ε'' ''U''r = MPa × % = (N·m−2·106)·(m·m−1·10−2) ''U''r = N·m·m−3·104 ''U''r = J·m−3·104 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Resilience (materials science)」の詳細全文を読む スポンサード リンク
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