See “Shell-to-solid submodeling and shell-to-solid coupling of a pipe joint,” Section For example, a static analysis performed in ABAQUS/Standard can drive a. Perform solid-to-solid, shell-to-shell, and shell-to-solid submodeling. Targeted This course is recommended for engineers with experience using Abaqus. script to perform the steps of the method in an automatic manner. Using the Keywords: Abaqus, Ansa, Meta, Submodelling, Multiscale analysis, Polymers .. scales from shells to solids, further constraints must be introduced, increasing the .
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Shell-to-solid submodeling and shell-to-solid coupling of a pipe joint. Repeat this data line as often as necessary to specify submodel boundary conditions at different tp. No parameters are used when fixed boundary conditions are specified as model data No parameters are used when fixed boundary conditions are specified as model data. This transfer is accomplished by saving the results from the global model either in the results.
Results and discussion The loading and boundary conditions are such that the pipe is subjected to bending. The values of user-defined field variables can be specified. Defining the driven variables in the submodel. The following limitations apply: If the file she,l is omitted, ABAQUS will correctly choose the extension if only the results file or the output database file exists. This parameter is relevant only for boundary conditions applied to peeform on the boundary of an adaptive mesh domain.
Element definitions for the S4 global model. To avoid this problem, write the nodal output to the output database or the results file using the same frequency for all nodes involved in the interpolation and choose a frequency that will allow the history in the submodel to be reproduced accurately. The user-specified exterior tolerance is used to check if the image node lies within the domain of the global model.
Referring to the global model results from the submodel analysis. Magnified solid submodel of the pipe-plate joint.
The fillet radius is not taken into consideration in the shell model. Transferring transverse shear stresses in shell-to-solid submodeling. If this parameter is omitted, the time variable is not scaled. It is your responsibility to judge that this use sumbodeling the submodeling feature is reasonable. Global analysis step basis Submodel step basis Global increment specified in definition of submodel boundary condition Driven variable basis General General none Linear perturbation General none General Static, linear perturbation i Linear perturbation Static, linear perturbation i.
For acoustic-to-structure submodeling, the loads due to acoustic pressure acting at the driven nodes of the submodel are activated by specifying pressure degree of freedom 8 along with the driven node set. Take advantage of this live online course right from your desk.
The following combinations of procedures between the global model and the submodel perfodm be considered: Specifying the driven nodes in acoustic-to-structure submodeling. The continuity of displacements and the minimal distortion of the stress field at the shell-to-solid interface indicates that the shell-to-solid coupling has been modeled accurately. These values affect only field-variable-dependent material properties, if any.
For shell-to-solid submodeling ABAQUS uses two kinds of tolerances to determine the relationship between the submodel and the global model. Click here for a listing of partner-led training classes. If the same step time is used in both the global model and the submodel, the time scale has no effect.
The global model for the submodeling analysis is meshed with S4R elements as shown in Figure 1. Set this parameter equal to the value by which the driven variables read from the global analysis are to be scaled.
In the case of a structure driving a fluid, you must ensure that the degrees of freedom to be driven in the submodel exist among the global model results. Global step soid and Global increment.
For shell-to-solid submodeling the driven degrees of freedom are chosen automatically based on a user-specified zone around the shell reference surface, as explained later. Mountain Time MT — 9: Obtaining a solution at a particular point in time using linear perturbation analysis.
Linking the global model and the submodel. The problem could be expanded by adding a ring of welded material to simulate a welded joint for this case the submodel would have to be meshed with new element layers representing the welded material at the joint.
The edge of a Lagrangian boundary region will follow the material while allowing adaptive meshing along the edge and in the interior of the region. The definition of initial conditions should be consistent between the global model and the submodel. You can define the geometric tolerance as a fraction of the size of submodelnig average element in the global model or as an absolute distance in the length units suubmodeling for the model.
Figure 7 shows the contours of the out-of-plane displacement component in the plate for both the static submodel and the shell-to-solid coupling analyses. Solid submodel overlaid on the shell model in the deformed state, using a magnification factor of Solid-to-solid Shell-to-shell Membrane-to-membrane Shell-to-solid Acoustic-to-structure.
Optional parameter Optional parameter: Model Edit Attributes submodel: If the submodel is not defined in terms of an assembly of part instances, the dots in the global element set name must be replaced by underscores: The submodel in these problems is a part of the structural component of the global model.
Online-Submodeling with Abaqus
Specifying the driven nodes in shell-to-solid submodeling. Provide the name of the global results file or output database file; the file extension is optional. For students who need it, we will provide a 7-day training license that supports the optimization feature.
In dynamic problems in which inertial forces are significant, the global model and the submodel shepl to be run for the same step time intervals. It is best to locate the submodel boundary in areas of low transverse shear stress in the global model. The acoustic pressure from the global model is interpolated to the submodel driven nodes.