$$$$ CRITLOC NOTICE CHAT 11/09/12 21:15:40 7124 DATE 11/09/12 Procedure CRITLOC Voir aussi : ------------------ TAB1 = CRITLOC TAB2 ; TAB2.'TNONL' .'OBJMO' .'RICE' .'RICE' .'EPSILON' .'SIGMA' .'ALPHA' .'BETA' .'EPSC' .'LAMBDA' .'SIG0' .'SIGC .'WEIBULL' .'V0' . 'M' .'TEMPER'. 'SIGU' 'TEREF' .'XMULT' .'IC' .'N' Description : _____________ The CRITLOC procedure enables the user to apply one of the following local criteria for rupture analysis : - Weibull criterion for clivage rupture - Rice criterion for ductile rupture Description of input and output data : ______________________________________ 1) When using new objects MMODEL and MCHAML TAB2 (table type) : _________________ TAB2.'TNONL' : table resulting from the nonlinear calculation (PASAPAS procedure results) TAB2.'OBJMO' : model object corresponding to the geometric region where the criterion is expected to be applied in the case of Rice criterion, complete model object in the case of Weibull criterion If Rice criterion for ductile rupture is requested : TAB2.'RICE' : VRAI (true) TAB2.'EPSILON' : VRAI if strain-controlled cohesion rupture TAB2.'SIGMA' : VRAI if stress-controlled cohesion rupture If TAB2.'EPSILON' is VRAI (true), the criterion parameter data must be supplied : TAB2.'ALPHA' : model parameters TAB2.'BETA' TAB2.'EPSC' : strain required with the creation of cavities IF TAB2.'SIGMA' is VRAI (true) the criterion parameters must be supplied : TAB2.'ALPHA' : model parameters TAB2.'BETA' TAB2.'LAMBDA' : depends on the inclusion shape ratio and on the sampling direction TAB2.'SIG0' : material elastic limit TAB2.'SIGC' : stress required with the creation of cavities If Weibull criterion for clivage rupture is requested : TAB2.'WEIBULL' : VRAI (true) TAB2.'V0' : constant connected with the size of the material microstructure TAB2.'M' : Weibull parameter TAB2.'TEMPER' : equals 1 when the clivage stress (named also material constant measuring its resistance to clivage) varies with the temperature equals 0 otherwise TAB2.'SIGU' : evolution object (type EVOL) representing the variation of sigu with the temperature if temper = 1 or value of sigu (type constant) if temper = 0 TAB2.'XMULT' : used for plastified volume calculation and equals : 1 if the whole structure is modeled 2 if there is one symmetry 4 if there are two symmetries TAB2.'IC' : equals 1 or 0 depending on whether the plastic strain effect on the clivage is wished to be taken into account For PLANE cases the following must also be provided TAB2.'EPAI' : thickness of the structure If TAB2.'TEMPER' equals 1, the following must also be provided : TAB2.'TEREF' : temperature of reference: the Weibull stress is calculated at this temperature (SIGW depends on SIGU(TEREF) ) If TAB2.'IC' equals 1, the following must also be provided : TAB2.'N' : equals 2 or 4 in most cases TAB1 (table type) : _________________ If Rice criterion for ductile rupture is requested : the procedure supplies the values averaged by an element of : TAB1.'TAUX' : growth rate R/R0 (MCHAML type) TAB1.'RAPPORT' : triaxiality rate Sm/Seq (MCHAML type) TAB1.'SIGEQ' : Von Mises stress (MCHAML type) TAB1.'EPSEQ' : accumulated plast. strain (MCHAML type) and (if SIGMA option) TAB1.'CONTDECO': local stress (MCHAML type) TAB1.'CPRINMAX': maximum principal stress (MCHAML type) If Weibull criterion for clivage rupture is requested : TAB1.'SIGW' : Weibull stress (FLOTTANT type) when SIGU is an evolution object, SIGW depends on SIGU(TE TAB1.'PROB' : probability of rupture (FLOTTANT type) when SIGU is a constant, PROBA = 1 - EXP ( - (SIGW/SIGU)** when SIGU is an evolution object, PROBA = 1 - EXP ( - (SIG TAB1.'VPLAS' : plastic volume (FLOTTANT type) TAB1.'SIGPMAX' : maximum pincipal stress (FLOTTANT type) TAB1.'ELEMENT' : element associated with SIGPMAX (MAILLAGE type) TAB1.'EPSEQ' : plastic strain associated with SIGPMAX (FLOTTANT type) Note : ________ The CRITLOC procedure works as a pre-processor for elastoplastic calculations; as a result, the input datum TAB2.'TNONL' is a TABLE type object constructed by means of the PASAPAS procedure. The criterion parameters must be supplied, as well as the model object corresponding to the geometric region where the criterion is expected to be applied. The output datum is a table containing several tables in which the probability of rupture for Weibull criterion and the growth rate of the cavities for each element of the geometric region considered for Rice criterion are stored. This is true for each elastoplastic calculation step. Intermediate calculation results such as Weibull stress or the triaxiality rate are also supplied. IMPORTANT : this procedure works only with solid elements. ---------
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