The ability of a material to resist stretching, compressing and shearing forces is called the Modulus.The amount that the material will change under external forces is defined by the modulus.When the forces are removed, the material will return to its original shape.The yield stress point is where the material's ability to return to the initial shape breaks down.The material will not return to its original shape when the external forces are removed.The material will break if the external forces drive the material past the strength point.You can learn how to calculate modulus with these tips.
Step 1: The material stress is caused by the stretching force.
Pulling out a piece of taffy straight out will stretch it.
Step 2: Shear force to the axis of the material causes material strain.
If you push on the middle of a tennis racket, it will bend the string.
Step 3: The measure is called the proportional fractional volume change.
In the stress and strain directions, apply a force to the material.When stress is applied, measure the dSs in the material.When the external force only applies strain, measure the dilation that occurs in the material.
Step 4: The bulk modulus can be calculated.
When external force is applied in the opposite direction, the bulk modulus shows the strength of the material.The force times area over which the force is applied is known as the external pressure p.The bulk modulus K is determined by p divided by dSs.
Step 5: Look at the shear modulus.
Shear modulus shows the strength of the material when external force is applied in the opposite direction.The shear modulus G is a unitless number and the external pressure p is expressed in MPa.The bulk modulus G is determined by p divided by dSn.
Step 6: Determine the Young's Modulus.
Stressing a material will cause strain.The relationship between stress and strain is described by Young's modulus.The relationship is linear up to the yield point.Young's stress is divided by strain.