# stiffness constant

## stiffness constant

[′stif·nəs ‚kän·stənt]
(mechanics)
Any one of the coefficients of the relations in the generalized Hooke's law used to express stress components as linear functions of the strain components. Also known as elastic constant.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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References in periodicals archive ?
Elastic stiffness constant is associated with the different compositions of system stress and strain.
where [E.sub.0] and [E.sub.1] represent the stiffness constant and viscosity coefficient of the string, respectively, and a is a constant which is used to describe the viscosity characteristic.
where [Q'.sub.ij] is the reduced stiffness constant of a unidirectional.
E is modulus of elasticity, according to the material conditions of E = 180 GPa, u = 0.3, [C.sup.1], [C.sup.2], [c.sup.3], [C.sup.4] is the stiffness constant of wire rope.
Bending Stiffness: Increase in foundation thickness, while keeping the spring stiffness constant, also affects the superstructure design.
The parameters for the experimental aeroservoelastic model are: wing chord (C=2b=0.182 m), wing span (L=0.4 m), rotation axis--CE (~ 28%C), mass center of the model--CG (~ 42%C), flap hinge line--S (~ 70%C), model mass (M=1.855 kg), model mass static moment about CE ([S.sub.[alpha]]=0.01729 kg x m), model mass moment of inertia about CE ([I.sub.[alpha]]=2.745 x [10.sup.-3] kg x [m.sup.2]), "plunge"-suspension stiffness constant ([K.sub.w] = 321.6 N/m), "pitch"-suspension stiffness constant ([K.sub.[alpha]]=1.25 Nm/rad), damping coefficients as a fraction of critical damping ([[zeta].sub.w]=0.1, [[zeta].sub.a]=0.1), aerodynamic coefficients of the model measured in wind tunnel [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII].
Divide the reaction forces found in step "b" at the L/3 and 2L/3 points by the corresponding deflections found in step "a" in order to determine the stiffness constant ([k.sub.r]) for the unsupported rail (where stiffness refers to force divided by deflection).
where [[lambda].sup.2] = 3[G.sup.0.sub.xy] ([t.sub.0] + [t.sub.90])[E.sup.0.sub.x]/[t.sup.2.sub.90][t.sub.0][E.sub.11][E.sub.22], and the laminate stiffness constants for shear [G.sup.0.sub.xy] = [G.sub.23]/(1+ [t.sub.0][G.sub.23]/[t.sub.90][G.sub.12]) and Young's modulus [E.sup.0.sub.x] = ([t.sub.0][E.sub.11] + [t.sub.90][E.sub.22])/([t.sub.0] + [t.sub.90]), subject to a global load [[sigma].sub.c].
where F denotes constrained force, k denote stiffness constants, u denotes displacement, and a is a small parameter.
For this mode, the static load and the stiffness constants [C.sub.z1], [C.sub.z2], M, and [b.sub.z] can be identified as
Te relevant parameters such as effective masses of electron, heavy-hole and light-hole, the lattice constant, hydrostatic (a) and shear (b) deformation potentials, and the elastic stiffness constants [C.sub.11] and [C.sub.12] of the ternary material are listed in Table 1 with their corresponding references.
Second, all stiffness constants are determined separately, and requirements from a thermodynamic point of view, such as objectivity are not incorporated when simply applying the anisotropic stiffnesses as finite strain tangent stiffness.

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