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HyperPhysics - Bulk Elastic Properties

HyperPhysics - Young's Modulus

University of Winnipeg - Deformation of Solids
General definitions of stress and strain.

University of Winnipeg - Changes in Length (one dimensional)
Summary of tensile stress, tensile strain and Young's modulus.

University of Winnipeg - Changes in Shape
Summary of shear stress, shear strain, and shear modulus.

University of Winnipeg - Changes in Volume
Summary of volume stress, volume strain, and bulk modulus.

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Special points of emphasis

Simple Harmonic Motion

Elastic Properties of Solids

A spring constant tells how difficult a spring is to stretch or compress, now many Newtons of force are required per meter of deformation. The higher the spring constant the stronger the spring.

In the discipline of elasticity, or 'mechanical properties', a quantity called the elastic modulus is central to the discussion. The elastic modulus tells you how much stress is required to produce a given strain (tensile, sheer, or bulk).

The elastic modulus provides the same kind of information about a solid body for a variety of different kinds of deformations that a spring constant provides about a spring. For the one dimensional deformation of a spring, the spring constant tells how much force (stress) is required to produce a certain amount of displacement on the spring (strain).

In fact, the more general elastic modulus relationship itself can be simply referred to as Hooke's Law. Hooke's Law for springs is a simple, model case of the more general relationship that Hooke expressed in the 17th century, 'As the extension, so the force.'

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