Operands ========= Operand RESULTAT ----------------- ♦ RESULTAT = summary, [result] Refers to the result of the mechanical calculation for which the Beremin quantities (Weibull stress and rupture probability) are calculated. Operand GROUP_MA ----------------- ♦ GROUP_MA = group_ma, [group_ma] Refers to the domain of the model on which the calculation of the Beremin quantities will be carried out. Note that only one group of elements is allowed. Operand DEFORMATION -------------------- .. code-block:: ♦ DEFORMATION =/"PETIT ", [DEFAUT] /"PETIT_REAC ", /"GDEF_LOG ", Define the assumptions for calculating deformations. For more details on deformation formalisms, see paragraph DEFORMATION of [:ref:`U4.51.11 `]. * In small deformations (DEFORMATION = 'PETIT' or DEFORMATION = 'PETIT_REAC'), the calculation is carried out using the Cauchy stress field SIEF_ELGA * In large logarithmic deformations (DEFORMATION = 'GDEF_LOG'), the calculation is carried out from the field of specific constraints :math:`T` close to the Kirchhoff stress defined in logarithmic space [:ref:`R5.03.24 `]. *Note 1: in large multiplicative deformations (DEFORMATION =' SIMO_MIEHE '), the macro command is not available.* *Note 2: to minimize the effects related to incompressibility (volume blocking under pressure in particular) it is now possible to carry out post-treatments of cleavage rupture mechanics with incompressible elements (GRAD_INCO) with POST_BEREMIN.* Operand FILTRE_SIGM -------------------- With 'SIGM_ELGA', the elementary fields of constraints are used in their representations with Gauss points. With 'SIGM_ELMOY', the elementary fields of the constraints are determined from the mean weighted by Gauss weights (as for *POST_ELEM*). Operand LIST_NUME_VARI ----------------------- Enter the indices of the internal variables of equivalent cumulative plastic deformation and plasticity indicators, usually named EPSPEQ and INDIPLAS in code_aster Operand LIST_NUME_SIEF ----------------------- If DEFORMATION =' GDEF_LOG ', fill in the indices of the close :math:`T` logarithmic constraints Kirchhoff constraints defined in logarithmic space [:ref:`R5.03.24 `] taken instead of the Cauchy stress tensor if DEFORMATION =' PETIT 'or' PETIT_REAC '(cf [LO17]) *Note 1: in large multiplicative deformations (DEFORMATION =' SIMO_MIEHE '), the macro command is not available.* *Note 2: to minimize the effects related to incompressibility (volume blocking under pressure in particular) it is possible to carry out post-treatments of cleavage fracture mechanics with the elements incompressible (GRAD_INCO) with POST_BEREMIN. * Operand COEF_MULT ------------------ ◊ COEF_MULT =\ coef., [R] The default value for this coefficient is 1.0. The following table, in which the thickness is noted :math:`e`, indicates typical values of the :math:`C` coefficient as a function of the type of symmetry: * **simple symmetry**: the plane of symmetry of the mesh passes through the plane of the defect and the defect is entirely meshed, * **double symmetry**: the plane of symmetry of the mesh also passes through the plane of the defect but only one half of the defect is meshed. .. csv-table:: "", "**3D** **and** **3D_SI**", "**AXIS** ****and**** AXIS_SI **", "**D_ PLAN **** **and** **D_ PLAN_SI**", "**C_ PLAN**" "SIMPLE ", "2"," :math:`4\mathrm{\pi }` ", "2nd", "2nd" "DOUBLE ", "4", "not applicable", "not applicable", "not applicable" "NON ", "1"," :math:`2\mathrm{\pi }` ", "e", "e" **Table** 3.5-1 **:** ****Values of the symmetry-thickness multiplier ratio** Operand SIGM_MAXI ------------------ Allows you to print a post-processing result file in MED format. This is the maximum of the main constraint where plasticity is active (field SIGW_ELGA).