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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Online-Submodeling with Abaqus
abwqus The maximum Mises stresses at the integration points and nodes for the reference solution, submodel, and shell-to-solid coupling analyses are shown in Table 1. To preclude certain elements from driving the submodel, you can specify a global element set to limit the search to this subset of the global model.
Run submodelimg heat transfer analysis of the global model, and write the nodal temperatures to the results or output database file. It is your responsibility to judge that this use of the submodeling feature is reasonable. The load is scaled in the second step. The submodel in these problems is a part of the structural component of the global model. Mesh constraints are typically applied on the edge of a sliding boundary region to fix it spatially. Comparison of out-of-plane displacement in the continuum mesh plate for the submodel with soolid boundary top and the shell-to-solid coupling analysis with scaled load bottom.
Mesh constraints must be used normal to an Eulerian abqqus region to allow material to flow through the region. The static submodel is meshed using three-dimensional C3D20R continuum elements see Figure 2. The submodel is run as a separate analysis from the global analysis.
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 relatively large difference between the maximum Mises stresses at the integration points and the nodes in the region of the fillet as illustrated in Table 1 indicates that the mesh in the fillet region is probably too coarse and should be refined.
Thus, the response at the boundary of the local region is defined by the ib for the global shelll. The exterior tolerance in solid-to-solid submodeling. If the global model is defined in terms of an assembly of part instances, give the complete name—including tp assembly and part instance names—when specifying the global element set.
Abaaqus of interpolating between the results at the start of the step and the results submoodeling the first increment on the results file, ABAQUS will simply use the results of the first increment as long as the submodel step time is less than the step time of the first increment on the results file. In a general analysis step or a direct-solution steady-state dynamic analysis step, ABAQUS calculates the amplitudes for the driven variables as functions of time or frequency from the results of the global model.
The continuum meshes used in the static submodeling and shell-to-solid coupling analyses are identical.
For example, an element set named top in part instance I-1 of assembly Assembly-1 must be referred to by Assembly Run a sequentially coupled thermal-stress analysis of the global model. The continuum meshes accurately model the fillet radius at the joint. Automatically selecting the driven variables in shell-to-solid submodeling. This restriction suggests that submodeling should not be used with these elements or that the submodel should include a set of narrow elements around its driven edges so that the sjell displacements at these nodes effectively transfer the rotation.
Usually it is enough for the layer of nodes closest to the shell reference surface to lie inside the center zone. The loading and boundary conditions are such that the pipe is subjected to bending. C3D20R submodel that uses the S4 global model.
The plate is clamped along all edges. Mixing general and linear tp steps. The definition of initial conditions should be consistent between the global model and the submodel. Any magnitude given will be ignored when the boundary conditions are given as model data.
Reference model with C3D20R elements. Element definitions for the S4R global model. If you do not select an increment in a static linear perturbation step, the last increment of the selected step in the global analysis is used as the basis for calculating the values for the driven variables. Shell-to-solid coupling model in the deformed state, using a magnification factor of Magnified solid submodel of the pipe-plate joint.
Because of such approximations, it is not possible to drive a submodel correctly if the driven nodes of the submodel lie within a shell thickness from a corner or a kink. If boundary conditions are applied to nodes in the interior of an adaptive mesh domain, these nodes will always follow the material. The user-specified exterior tolerance is used to check if the image node lies within the domain of the global model.
Both the global model and the submodel can have nonlinear response and can be analyzed for any sequence of analysis procedures. For the remaining driven nodes only the displacement components parallel to the sybmodeling model midsurface are driven from the global model.
No such refinement was performed in this example. Last degree of freedom constrained.
The exterior tolerance in shell-to-solid submodeling. REAL Include this parameter default to define the real in-phase part of the part of the boundary condition.
Defining the driven variables in the submodel. For details, see Figure Different element types can be used in the submodel than those used to model the corresponding region in the global model.
These results must be written in the global coordinate system of the model. High transverse shear stresses occur only in regions where bending moments vary rapidly; it is better not to locate the submodel boundary in such regions.
Shell-to-solid submodeling models a region with solid elements, when the global model is made up of perdorm elements. By default, the global model in the vicinity of the submodel is searched for elements that contain driven nodes; the submodel is then driven by the response of these elements.
Pacific Time PT — 8: If this parameter is omitted, the time variable is not scaled.