Adaptation of the Newton-Raphson and Potra-Pták methods for the solution of nonlinear systems
DOI:
https://doi.org/10.5433/1679-0375.2021v42n1p63Keywords:
Potra-Pták, Space trusses, Nonlinear analysis, Algorithm, Positional formulationAbstract
In this paper we adapt the Newton-Raphson and Potra-Pták algorithms by combining them with the modified Newton-Raphson method by inserting a condition. Problems of systems of sparse nonlinear equations are solved the algorithms implemented in Matlab® environment. In addition, the methods are adapted and applied to space trusses problems with geometric nonlinear behavior. Structures are discretized by the Finite Element Positional Method, and nonlinear responses are obtained in an incremental and iterative process using the Linear Arc-Length path-following technique. For the studied problems, the proposed algorithms had good computational performance reaching the solution with shorter processing time and fewer iterations until convergence to a given tolerance, when compared to the standard algorithms of the Newton-Raphson and Potra-Pták methods.Downloads
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