The science concerned with fluids, either at rest or in motion, and dealing with pressures, velocities, and accelerations in the fluid, including fluid deformation and compression or expansion.


Related Terms

PLASTICOVISCOSITY

Plasticity in which the rate of deformation of a body subjected to stresses greater than the yield stress is a linear function of the stress.

PLASTIC COLLISION

A collision in which one or both of the colliding bodies suffers plastic deformation and mechanical energy is dissipated.

PERMANENT SET

Permanent plastic deformation of a structure or a test piece after removal of the applied load. Also known as set.

MUSKHELISHVILI'S METHOD

A method of solving problems concerning the elastic deformation of a planar body that involves using methods from the theory of functions of a complex variable to calculate analytic functions which determine the plane strain of the body.

MOIRE INTERFEROMETRY

An optical technique that measures the components of deformation of a specimen surface in the plane of the surface by superposing a reference grating and a diffraction grating that is applied to, and deforms with, the surface.

MODULUS OF ELASTICITY IN SHEAR

A measure of a material's resistance to shearing stress, equal to the shearing stress divided by the resultant angle of deformation expressed in radians. Also known as coefficient of rigidity; modulus of rigidity; rigidity modulus; shear modulus.

MAGNETOSTRICTIVE LOUDSPEAKER

[ENG ACOUS] Loudspeaker in which the mechanical forces result from the deformation of a material having magnetostrictive properties.

KELVIN BODY

An ideal body whose shearing (tangential) stress is the sum of a term proportional to its deformation and a term proportional to the rate of change of its deformation with time. Also known as Voigt body.

INELASTIC

Not capable of sustaining a deformation without permanent change in size or shape.

HOOKEAN DEFORMATION

Deformation of a substance which is proportional to the force applied to it.

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