## Elastic modulus

An elastic **modulus** , or **modulus** of elasticity , is the mathematical description of an object or substance's tendency to be deformed elastically (i.e., non-permanently) when a force is applied to it. The elastic **modulus** of an object is defined as the slope of its stress-strain curve in

**wikipedia.org**| 2011/5/15 0:27:43

## Shear modulus

In materials science , shear **modulus** or **modulus** of rigidity , denoted by G , or sometimes S or μ , is defined as the ratio of shear stress to the shear strain : [ 1 ] where = shear stress; F is the force which acts A is the area on which the force acts in engineering, = shear

**wikipedia.org**| 2011/7/19 4:00:11

## Iso-elastic

Instead, an iso-elastic system is employed. The springs used are large, stiff springs with a high **modulus** of elasticity , and they are highly tensioned. A compound pulley system is then used so that the large force exerted by the spring can be divided by a factor of (say) five. The cable

**wikipedia.org**| 2011/5/3 1:16:59

## Young's modulus

Young's **modulus** is a measure of the stiffness of an elastic material and is a quantity used to characterize materials. It is defined as the ratio of the uniaxial stress over the uniaxial strain in the range of stress in which Hooke's Law holds. [ 1 ] In solid mechanics , the slope of

**wikipedia.org**| 2011/8/18 14:08:14

## Elastic energy

The concept of elastic energy is not confined to formal elasticity theory which primarily develops an analytical understanding of the mechanics of solid bodies and materials [ 1 ] :See Ch 1 §1 . The essence of elasticity is reversibility. Forces applied to an elastic material transfer energy

**wikipedia.org**| 2011/6/7 22:18:37

## Strength of materials

ultimate) strength. For example failure in buckling is dependent on material stiffness (Young's **Modulus** ). Contents 1 Types of loadings 2 Definitions 2.1 Stress terms 2.2 Strength terms 2.3 Strain (deformation) terms 3 Stress-strain relations 4 Design terms 4.1 Failure

**wikipedia.org**| 2011/8/19 7:26:53

## Yield (engineering)

, so the stress-strain graph is a straight line, and the gradient will be equal to the elastic **modulus** of the material. Elastic limit (yield strength) Beyond the elastic limit, permanent deformation will occur. The lowest stress at which permanent deformation can be measured. This requires

**wikipedia.org**| 2011/9/2 7:00:31