StressandStrain - Stress and Strain Up to now we have been...

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Stress and Strain Up to now we have been studying the dynamics of rigid bodies , that is, idealized objects that have a definite size and shape, but one in which the particles making up the object are constrained so that the relative positions of the particles never changes. In other words, the rigid body does not ever stretch, squeeze or twist. However, we know that in reality this does occur, and we need to find a way to describe it. This is done by the concepts of stress , strain and elastic modulus . Stress is a measurement of the strength of a material, strain is a measure of the change in the shape of the object that is undergoing stress and elastic modulus is a measurement of the amount of stress needed to change the shape of the object. There are three main types of stress. If we stretch or compress an object, we are subjecting it to a tensile stress . If an object is subjected to a force along an entire surface, changing its volume, then it is said to be experiencing a bulk stress . Finally, if the force is acting tangentially to the surface, causing it to twist,
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StressandStrain - Stress and Strain Up to now we have been...

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