FEA Terms and Definitions



FEA Terms and Definitions

• [w] Derived from Wilde FEA Ltd (wildefea.co.uk)

• [ist] Derived from Integrated System Technologies ()

• [eud] Derived from KoralSoft Company ()

• [sa] Derived from SA Dictionary ()

• [bas] Derived from BAS Dictionary (BULGARIAN ACADEMY OF SCIENCES, 1966)

• [ans] Derived from Anwers Corp. Dictionary ()

W

WAVE PROPAGATION

[w] The dynamic calculation involving the prediction of the history of stress and pressure

waves in solids and fluids.

WAVEFRONT (FRONT)

[w] The wavefront of a symmetric matrix is the maximum number of active nodes at any time

during a frontal solution process. It is a measure of the time required to factorise the

equations in a frontal solution. It is minimized be element renumbering.

WEIGHTED RESIDUALS

[w] A technique for transforming a set of partial differential equations to a set of simultaneous

equations so that the solution to the simultaneous equations satisfy the partial differential

equations in a mean sense. The form used in the finite element method is the Galerkin

process. This leads to identical equations to those from virtual work arguments.

WHIRLING STABILITY

[w] The stability of rotating systems where centrifugal and Coriolis are also present.

WHITE NOISE

[w] White noise has a constant spectral density for all frequencies.

WILSON THETA METHOD

[w] An implicit solution method for integrating second order equations of motion. It can be

made unconditionally stable.

WORD LENGTH

[w] Within a digital computer a number is only held to a finite number of significant figures. A

32bit (single precision) word has about 7 significant figures. A 64bit (double precision)

word has about 13 significant figures. All finite element calculations should be conducted

in double precision

X

Y

YOUNGS MODULUS

[w] The material property relating a uniaxial stress to the corresponding strain.

Z

ZERO ENERGY MODES, ZERO STIFFNESS MODES

[w] Non-zero patterns of displacements that have no energy associated with them. No forces

are required to generate such modes, Rigid body motions are zero energy modes.

Buckling modes at their buckling loads are zero energy modes. If the elements are not

fully integrated they will have zero energy displacement modes. If a structure has one or

more zero energy modes then the matrix is singular.

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