Cubic Stiffness Block
Cubic Stiffness blocks store a set of coefficients that determine two cubic
polynomials defining a force verses deflection curve. If the Direction block selects
the cubic stiffness formulation for TY direction, then the property file, for
example, must contain a [CUBIC_STIFFNESS_TY]
block.
The following table describes the parameters stored in a Cubic Stiffness block. Abbreviations are: [F] = force, [L] = length.
Parameter | Type | Dimension FX, FY, FZ | Dimension TX, TY, TZ |
---|---|---|---|
EN | real | [L] | Angle |
ENS | real | [F][L-1] | [F][L]/Angle |
RN | real | [L] | Angle |
RNF | real | [F] | [F][L] |
OS | real | [F][L-1] | [F][L]/Angle |
OF | real | [F] | [F][L] |
O | real | [L] | Angle |
RP | real | [L] | Angle |
RPF | real | [F] | [F][L] |
EP | real | [L] | Angle |
EPS | real | [F][L-1] | [F][L]/Angle |
In a property file, a cubic stiffness block has this form:
[CUBIC_STIFFNESS_TY]
EN = -0.20
ENS = 200000.0
RN = -0.10
RNF = -30000.0
O = 0.0
OF = 0.0
OS = 20000.0
RP = 0.10
RPF = 30000.0
EP = 0.20
EPS = 200000.0