Ratio of an applied force or torque to change in position for a mechanical system.

The stiffness of a system with respect to a deformation (e.g., the stiffness of a spring with respect to stretching) is the second derivative of the energy with respect to the corresponding displacement; this measures the curvature of the potential energy surface along a particular direction. Positive stiffness is associated with stability, and a large stiffness can result in a small positional uncertainty in the presence of thermal excitation. Negative stiffnesses correspond to unstable locations on the potential energy surface. Alternative terms for stiffness include force gradient and rigidity.

A quality of paper alluding to its rigidity and resistance to bending and inflexibility.

The ratio of change in load to accompanying change in deformation of a member fabricated of a Hookean material and activated within its elastic limit; the slope of the load-versus-deformation plot beneath the elastic limit.

The property of a conductor that causes it to resist permanent deformation by bending.

A measure of resistance offered to external loads by a specimen or structure as it deforms.

In perforating, the ability of a metal or shape to resist deflection.

the physical property of being inflexible and hard to bend

The ability to resist movement induced by an applied torque. Stiffness is often specified as a torque displacement curve, indicating the amount a motor shaft will rotate upon application of a known external force when stopped.

A material's ability to resist bending; relationship of load to deformation for a particular material.

The property of a fiber, or fabric to resist bending, or to carry a load without deformation. Stop Motion Any device that automatically stops a textile machine's operation on the occurrence of a yarn break, high defect count, etc.

This is a general term which may be applied to materials or structures. When a force is applied to a structure, there is a displacement in the direction of the force; stiffness is the ratio of the force divided by the displacement. High stiffness means that a large force produces a small displacement. When discussing the stiffness of a material, the concept is the same, except that stress substitutes for force, and strain substitutes for displacement; see modulus of elasticity.

The relationship of load to deformation for a particular material.

The spring-like quality of mechanical and hydraulic elements to elasticity deform under load.

The relationship of load and deformation; a term often used when the relationship of stress to strain does not conform to the definition of Young's modulus. See also modulus of elasticity.

The ability of a material to withstand deflection. Based on the ratio of stress to movement.

a material property: A stiff material is difficult to stretch or bend

The ability of a device to resist deviation due to load change.

The ratio of the force required to create a certain deflection or movement of a part expressed as (Force/deflection) lbs/in or grams/cm.

Ability of a fiber or fabric to resist bending.

Resistance to elastic deformation.

The measure or degree of resistance to bending stress of a material.

In process instrumentation, the ratio of change of force (or torque) to the resulting change in deflection of a spring like element. NOTE: Stiffness is the opposite of compliance [S51.1].

condition of rigidity and inflexibility of joints or muscles ( Kaishore Guggulu)

Property of paper and paperboard to resist bending. For the explanation of the test to determine the stiffness of paper, see Chapter 6.

relationship describing motor displacement from a fixed position due to an applied torque of specified value.

Susceptibility to distortion or volume change under load.

The ability of paper to resist bending and/or support its own weight.

A measure of modulus. The relationship of load and deformation. The ratio between the applied stress and resulting strain. A term often used when the relationship of stress to strain does not conform to the definition of Young's modulus.