Details
| Original language | English |
|---|---|
| Pages (from-to) | 261-279 |
| Number of pages | 19 |
| Journal | Computer Methods in Applied Mechanics and Engineering |
| Volume | 59 |
| Issue number | 3 |
| Publication status | Published - Dec 1986 |
Abstract
This paper is focussed on path following methods which are derived from consistent linearizations. The linearization procedure leads to some well-known constraint equations-like the constant arc length in the load-displacement space-and to different formulations than those given in the literature. A full Newton scheme for the unknown quantities (displacements and load parameter) can be formulated. A comparison of the derived algorithms with other path following methods is included to show advantages and limits of the methods. Using the linearization technique together with scaling a family of path following methods is introduced. Here, the scaling bypasses physical inconsistencies associated with mixed quantities like displacements and rotations in the global vector of the unknowns. Several possible scaling procedures are derived from a unified formulation. A discussion of these methods by means of numerical examples shows that up to now the choice of the scaling procedure is problem-dependent. If the arc-length methods are combined with a modified Newton method, an enhancement of the algorithms is achieved by line search techniques. Here, a simple but efficient line search was implemented and compared with a numerical relaxation technique. Both methods improve the convergence rate considerably.
ASJC Scopus subject areas
- Engineering(all)
- Computational Mechanics
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
- Physics and Astronomy(all)
- General Physics and Astronomy
- Computer Science(all)
- Computer Science Applications
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In: Computer Methods in Applied Mechanics and Engineering, Vol. 59, No. 3, 12.1986, p. 261-279.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Consistent linearization for path following methods in nonlinear fe analysis
AU - Schweizerhof, K. H.
AU - Wriggers, Peter
N1 - Funding information: authors gratefully acknowledget he support of the Deutsche Forschungsgemeinschaft and want to thank Professor E. Ramm for encouragementsa nd valuable discussions.
PY - 1986/12
Y1 - 1986/12
N2 - This paper is focussed on path following methods which are derived from consistent linearizations. The linearization procedure leads to some well-known constraint equations-like the constant arc length in the load-displacement space-and to different formulations than those given in the literature. A full Newton scheme for the unknown quantities (displacements and load parameter) can be formulated. A comparison of the derived algorithms with other path following methods is included to show advantages and limits of the methods. Using the linearization technique together with scaling a family of path following methods is introduced. Here, the scaling bypasses physical inconsistencies associated with mixed quantities like displacements and rotations in the global vector of the unknowns. Several possible scaling procedures are derived from a unified formulation. A discussion of these methods by means of numerical examples shows that up to now the choice of the scaling procedure is problem-dependent. If the arc-length methods are combined with a modified Newton method, an enhancement of the algorithms is achieved by line search techniques. Here, a simple but efficient line search was implemented and compared with a numerical relaxation technique. Both methods improve the convergence rate considerably.
AB - This paper is focussed on path following methods which are derived from consistent linearizations. The linearization procedure leads to some well-known constraint equations-like the constant arc length in the load-displacement space-and to different formulations than those given in the literature. A full Newton scheme for the unknown quantities (displacements and load parameter) can be formulated. A comparison of the derived algorithms with other path following methods is included to show advantages and limits of the methods. Using the linearization technique together with scaling a family of path following methods is introduced. Here, the scaling bypasses physical inconsistencies associated with mixed quantities like displacements and rotations in the global vector of the unknowns. Several possible scaling procedures are derived from a unified formulation. A discussion of these methods by means of numerical examples shows that up to now the choice of the scaling procedure is problem-dependent. If the arc-length methods are combined with a modified Newton method, an enhancement of the algorithms is achieved by line search techniques. Here, a simple but efficient line search was implemented and compared with a numerical relaxation technique. Both methods improve the convergence rate considerably.
UR - http://www.scopus.com/inward/record.url?scp=0022866967&partnerID=8YFLogxK
U2 - 10.1016/0045-7825(86)90001-0
DO - 10.1016/0045-7825(86)90001-0
M3 - Article
AN - SCOPUS:0022866967
VL - 59
SP - 261
EP - 279
JO - Computer Methods in Applied Mechanics and Engineering
JF - Computer Methods in Applied Mechanics and Engineering
SN - 0045-7825
IS - 3
ER -