*NEWTONDYN

Data format:

A single line comprising 7 values

ITEMAX PMAXD1 PMAXD2 PMAXD3 PMAXD4 IKRIG IKDIV

Status :

Optional

Purpose :

Newton-Raphson algorithm parameters within a time step of Newmark algorithm : convergence criteria, N-R modified

Details : ITEMAX Maximum iterations number

Parameter	Description
PMAXD1	Convergence is achieved for forces when each component of the unbalanced forces vector is less than PMAXD1 % of the maximal tension.(def = 0.1)
PMAXD2	Convergence is achieved for moments when each component of the unbalanced moments vector is less than PMAXD2 % of the maximal moment.(def = 0.1)
PMAXD3	Convergence is achieved for translations when each component of the incremental translations vector is less than PMAXD3 times the maximal allowed translational displacement.(def = 0.1)
PMAXD4	Convergence is achieved for rotations when each component of the incremental rotations vector is less than PMAXD4 times the maximal rotational displacement. (def = 0.1)
IKRIG	- = -1 complete Newton-Raphson algorithm, stiffness matrix calculated at every iteration - = 0 modified Newton-Raphson algorithm, stiffness matrix kept constant while convergence seems possible (def = -1)
IKDIV	iteration number to start convergence checking (def. = 2)

Note

If IKRIG = -1, the last parameter is useless

Example : *NEWTONDYN

cItemax Pmaxd1 Pmaxd2 Pmaxd3 Pmaxd4 Ikrig

50 0.1 0.1 0.1 0.1 -1