Secant Newton Algorithm
This command is used to construct a SecantNewton algorithm object which uses the two-term update to accelerate the convergence of the modified newton method. The command is of the following form:
algorithm SecantNewton < -iterate $tangIter >
< -increment $tangIncr > < -maxDim $maxDim >
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tangent to iterate on, options are current, initial, noTangent. default is current. |
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tangent to increment on, options are current, initial, noTangent. default is current |
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max number of iterations until the tangent is reformed and acceleration restarts (default = 3) |
NOTES:
The default “cut-out” values recommended by Crisfield (R1=3.5, R2=0.3) are used.
REFERENCES:
Crisfield, M.A. “Non-linear Finite Element Analysis of Solids and Structures”, Vol. 1, Wiley, 1991.
Code Developed by: Michael Scott, Oregon State University