What are the different types of stiffness?

Rotational stiffness

• shear stiffness – the ratio of applied shear force to shear deformation.
• torsional stiffness – the ratio of applied torsion moment to the angle of twist.

What is meant by stiffness of a spring and write an expression for it?

If a spring is compressed, then a force with magnitude proportional to the decrease in length from the equilibrium length is pushing each end away from the other. F = -kx. The proportional constant k is called the spring constant. It is a measure of the spring’s stiffness.

What is difference between hardness and stiffness?

Stiffness is how a component resists elastic deformation when a load is applied. Hardness is resistance to localized surface deformation.

What is stiff material?

A stiff material has a high Young’s modulus and changes its shape only slightly under elastic loads (e.g. diamond). A stiff material requires high loads to elastically deform it – not to be confused with a strong material, which requires high loads to permanently deform (or break) it.

What is stiffness in elasticity?

The ability of a material or an object to resume its normal size and shape after being stretched or compressed is called elasticity. The extent to which an object resists deformation in response to an applied force is called stiffness.

What is stiffness of a material?

A material’s stiffness indicates its ability to return to its original shape or form after an applied load is removed. When a material is subjected to a load — its own unsupported weight, an external applied load, or both — it experiences stress and strain.

What is the difference between stiffness and extension?

Extension of a coil spring, δ, caused by an axial force, F. Stiffness is the extent to which an object resists deformation in response to an applied force. The complementary concept is flexibility or pliability: the more flexible an object is, the less stiff it is.

What is the difference between axial stiffness and bending stiffness?

Axial stiffness is a measure of the force to produce unit axial deformation(shortening due to compression or elongation due to tension) and depends on Area of cross section and Elastic modulus. Bending stiffnes is a measure of the force to produce unit rotation and depends on Moment of Inertia of the cross section and the elastic modulus.

What is the definition of bent stiffnes?

Bending stiffnes is a measure of the force to produce unit rotation and depends on Moment of Inertia of the cross section and the elastic modulus. Deliver better patient care with this online program.