Benchmark solutions
======================

Calculation method
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The reference solution is calculated with Code_Aster using the "classical" Newton-Raphson algorithm.


Reference quantities and results
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The reference result is the force-displacement curve obtained with the iterative Newton-Raphson method. Force values are compared at different loading levels.


Uncertainty about the solution
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Comparison of two solutions obtained with Code_Aster. Since method IMPLEX is by definition approximate, we will have a deviation from the Newton solution (but which must remain small).


Bibliographical references
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1. J. OLIVER, A.E. HUESPE and J.C. CANTE "An implicit/explicit scheme to increase computability of non-linear material and contact/friction problems", Computer Methods in Applied Mechanics and Engineering, vol. 197 and engineering, vol. 197, 2008.