User`s Manual
Contents
1. r e Affect the materials to surfaces by Menu Data Materials Assign and then selecting surfaces 4 2 Mesh GID Menu Mesh e Create Mesh by Menu Mesh Generate Mesh e Check that all materials have been assigned to mesh elements Menu Data Materials Draw all materials MechaRock International Consultants 2014 www mecharock com DISCRAC User s Manual 5 5 Discrac options 1 and 3 Mesh creation for domains containing fractures and bolts After assigning materials to all the lines present in the geometry fractures bolts bars see the Materials Catalogue Boundary material to boundary lines of the domain and Geomline to geometrical lines used for instance to separate to sub domains the domain must be divided in closed sub domains This is done by GID Menu Files Import Batch file LineMesh_GID bch this file is in the project gid folder GID Menu Files Export GID Mesh project_F msh in the project gid folder From Windows Consol launch Discrac 1 project Return back to GID Menu Files Import Batch File project_GID bch this file is in the project gid folder Then closed sub domains are created in the Geometry The following step consists in assigning materials to surfaces bulk materials and mesh only the surfaces and then splitting the nodes to create fracture and bolt elements GID Menu Data Materials assign bulk materials to surfaces GID Menu Mesh lines and surfaces GID Menu Files Export GID M2. Fracture Simulation in Materials FRACSIMA www mecharock com Fracsima October 2014 IDihs CIRAIC User s Manual DISCRAC User s Manual 2 1 Introduction DISCRAC is a pre processor for creating Finite Element meshes for structures containing discontinuities like cracks fractures and bolts DISCRAC DIScretization of CRACked media It is a part of the code Disroc conceived for modeling fractured rocks DIScontinuous ROCks but it is independent of it and can be used for other FEM codes In its actual version Discrac needs to be interfaced with a classical FE mesh generation tool This manual presents Discrac as a the complementary meshing tool for Disroc and interfaced with the Pre and Post Processor GID www gidhome com as the basic mesh generation tool It is supposed that the materials have been defined by Windisroc 2 Command and control interfaces Commands are launched from the Windows Consol 2 1 Windows Consol The Windows Consol is created from the Windows menu Start All Programs Accessories Command Invited The windows console created is positioned initially on the folder C Users User gt C Users User gt Then this consol must be positioned on the folder Disroc This can be down by the command cd change directory in the following waytype the command C Users User gt cd PATH Disroc Instead of typing the complete path to Disroc folder it is possible to fetch it on a
3. in the model again the mesh project_graph msh must be imported to display results corresponding to discontinuities Elsewhere a message error is first generated by GID and then only the results corresponding to surface elements can be displayed 6 Discrac options 5 The list of all existing materials can be seen in gid menu Data materials or by using the option 5 of Discrac Discrac 5 project Creates the file Natelem dat in the folder project gid Exemple File Natelem dat of the project jointseul jointseul gid frac dat jointseul gid mail dat 4 1 2 Fracture Fracture HM 3 1 Boundary 4 0 Geomline 5 2 Fracture Newfrac Materials 6 1 Fracture HM 2 Matrice HM 3 Boundary 4 Geomline 5 Newfrac 6 Matrice2 The command Disrcac 5 project 1 displays the list of the materials on the monitor It creates also the file Natelem dat containing the same information ca Administrateur Invite de commandes i x pexlicerssPouvasDocumente MesdocesCodecnuneriques lt etab b1ehoe 2 2 2 n10si4sdiccrcian c 5 jointseul i E _ Diserac Ui 2 3 Fracsima 15 05 2015 Project File Projects jointseul gid jointseul Reading materials of Projects jointseul gid jointseul Materials 6 Fracture HM Matrice Hh Boundary Geomline Hew rac Matriced END Discrac Option 5 CG Users PouyasDocumentsMesdocs Codesnumeriques Stab DI ROC 2 2 2 618514 gt MechaRock International Consultants
4. windows positioned on the folder Disroc and gliding it on the Consol window after the command cd and then press return figure below mam Guz Documents Mesdocs Codesnumeriques DISROC PL aa Gs Invite de commandes Miohoent Undime Lueksaoc a Partager avec w Grawer Nouveau dossier Copyright c gt 2009 Microse of Favoris Bibliotheque Documents Mire Lt Pui Co Users Pouyarcd U Windows consol positioned on the folder Disroc MechaRock International Consultants 2014 www mecharock com DISCRAC User s Manual 3 B Invite de commandes Microsoft Windows version 6 1 76861 Copyright c gt 2009 Microsoft Corporation Tous droits r serv s Co Users Pouyarcd Co UsersPouya sDocuments Mesdocs Codesnumeriques DISKOC BC Users Pouyas Documents Mesdocs Codesnumeriques DIS ROC m 2 2 GID interface The project geometry mesh and boundary conditions are defined and the materials are assigned to different parts of the domain by the pre processor GID The calculation results are displayed plotted or processed by the post processor GID The pre and post processor GID has to be installed on the computer For its download and installation method see http www gidhome com download official versions win64 It is recommended to download the GID 10 0 08 version see in All Other Released Versions in GID page Project UNNAMED Files View Geometry Utilities D
5. 2014 www mecharock com DISCRAC User s Manual 7 Discrac options 6 and 7 These two options allow transforming the sides of surface elements triangles or quadrilaterals to fractures The fracture into which the sides are to be transformed must be already existing in the list of materials of the project before this operations e Discrac 6 1 Create projet_ND msh which contains all surface and line elements figure 1 a 2 From Dos windows launch Discrac 6 project n where n is the material number of the fracture to which all the elements sides have to be transformed Example Daiscrac 6 jointseul 5 All the sides are transformed to the fracture Newfrac figure 1 b Fracture HM E Fracture HM Matrice HM E Matrice Hm ia Boundary BB ceomiine E Newfrac i E Boundary E Geomline Figure 1 a Figure 1 b Note that the existing lines like Fractures Geomlines or Boundaries are not changed by this operation The procedure Discrac 6 saves the initial project_ND msh in the file project_NDinit msh and put the new mesh with new fractures in project_ND msh Then the command Discrac 3 project lt Has to be launched to split the fractures in the new project_ND msh and create the files project_graph msh and project_cal msh figure 2 a for jointseul_graph msh MechaRock International Consultants 2014 www mecharock com DISCRAC User s Manual 8 Note that in this file the initial Geomline is not
6. ata Mesh Calculate Help SB ASo 85 QunSan0 rq is ee Z S l Command MechaRock International Consultants 2014 www mecharock com DISCRAC User s Manual 4 3 General processing diagram The geometry with fractures and bolts defined as lines are created in GID A preliminary mesh is also created by GID Then Discrac is used to create special elements for fractures and bolts The general syntax of Discrac command from the windows consol is Discrac opt project optl opt2 opt and project are mandatory opt1 and opt2 can be needed in different cases opt is the number to 7 project is the name of the project to be treated The project GID folder mus be placed in the folder Disroc Projects 4 Geometry and initial mesh if no fractures and bolts The geometry mesh and boundary conditions are defined and the materials are affected to elements in GID Run GID Menu File open project gid Menu Data Materials Check that materials defined in Windisroc appear well here Two additional materials Boundary and Geomline will be present in the list 4 1 Geometry GID Menu Geometry e Define the lines Menu Geometry Create Straight line or use on the tools bar the icon 5 Create line gt r a e When all the lines are defined define closed surfaces by Menu Geometry Create NURBS Surface or by using the icon
7. esh project_ND msh in the project gid folder From Windows Consol launch Discrac 3 project This last action creates two mesh files project_graph msh and project_cal msh in the project gid folder The first one is used for graphical purposes and the second for calculation purposes Return back to GID and check that fracture and bolt elements have well been created Menu Files Import GID Mesh project_graph msh erase the existing mesh if any GID Menu Data Materials Draw all materials The fractures are bolts must appear as distinct lines in the mesh Then upload the mesh used for calculation purposes apply to it boundary conditions and created the calculation entry file Menu Files Import GID Mesh project_cal msh this file is in the project gid folder with erasing the previously existing mesh The discontinuities exist in this file but can not be seen graphically If the materials are drawn GID Menu Data Materials Draw all materials Then the name of materials corresponding to fractures and bolts appear in the legend of the figure but the fractures can not be seen on the mesh On this mesh the boundary conditions are defined and the calculations entry file project is created by using the template DISROC_2 bas The calculation is launched as for the cases without discontinuities MechaRock International Consultants 2014 www mecharock com DISCRAC User s Manual 6 Warning At the post processing stage if fractures are present
8. ice2 fA Figure 3a Figure 3b As the previous procedure this procedure Discrac 7 saves the initial project_ND msh in the file project_NDinit msh and put the new mesh with new fractures in project_ND msh Again the command Discrac 3 project lt is necessary to split the fractures in the new project_ND msh and create the files project_graph msh and project_cal msh figure 4a for jointseul_graph msh MechaRock International Consultants 2014 www mecharock com DISCRAC User s Manual 10 Fracture HM B Matrice Hm Newtfrac Matrice Figure 4a Between the commands Discrac 6 projectn or Discrac 7 projectn m and the command Discrac 3 project itis recommended to check in GID if the sides have been correctly transformed to fractures DID menu Files import GID mesh project_ND msh Note If there are several groups of elements and corresponding fractures the operation Discrac 7 projectn m can be repeated several times because each action starts with the result project_ND msh of the previous stage MechaRock International Consultants 2014 www mecharock com
9. transformed to Newfrac To avoid this the initial Geomline in the initial geometry file has to be defined as a fracture line Newfrac the example of figure 2 b Geomlines allow in this procedure to not define fractures on some sides Note If there are both line elements et surface triangular elements present in the model do not use the function Mesh Edit Mesh Split Elements in GID because in this case only triangular elements are splitted and not the line elements in contact with them their sides and this generates errors later in Discrac Fracture HM Fracture HM E Matrice HM E Matrice HM Newfrac a Newtrac Figure 2a Figure 2b e Discrac 7 Discrac 7 allows to transform the sides of only one group of surface elements triangles and quadrilaterals in fractures The group of elements is designated by a material number The command 1s Discrac 7 project n m where n is the fracture number to which the sides are transformed m is the material number of surface elements concerned by this operation Example Discrac 7 jointseul 5 6 MechaRock International Consultants 2014 www mecharock com DISCRAC User s Manual The sides of the elements corresponding to the material 6 Matrice2 are transformed to fractures 5 Newfrac Figures 3a 3b Fracture HM E Matrice Hm Ba Boundary Fracture HM E Matrice Hm ie Gseomline Newtrac Matrice x E Boundary Geomline WD Matt
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