(+44) 020-36408636 uk@NidaEurope.com

Remember Me

## General Nonlinear Parameters for Analysis

It describes the number of total load cycles for the nonlinear analysis. The number is equal to the total number of load cycles required in the Analysis.

### Maximum Iterations for each Load Cycle

It describes the maximum number of iteration for each load cycle in the analysis. If the equilibrium condition is satisfied before this number is reached or the iteration number is equal to this assigned iteration number, another load step will be imposed until the permitted number of load steps is reached. The tolerance for equilibrium check is 0.1 % by default. That is, when the Euclidean norms of the unbalanced displacements and the unbalanced forces are less than respectively 0.1 % of the total applied forces and the total accumulated displacements, the equilibrium condition is assumed to have been satisfied.

### Number of Iterations for Tangent Stiffness Matrix

It describes the number of iterations for the tangent stiffness matrix to reform during the iterative process. When this number is specified to be very large or simply equal to the “maximum number of iterations for each load cycle” above, the iterative scheme will then become the modified Newton Raphson method. If the number here is specified as "1”, it becomes the Newton Raphson method. If the number is between these two extremes, the method is a mixed Newton-Raphson method. When compared to modified Newton Raphson method, the Newton Raphson method generally requires less number of iterations for convergence, but longer time for each iteration. It is recommended to use the Newton Raphson method.  