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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Node definitions for the C3D20R submodel that uses the S4 global model.
The acoustic-to-structure submodel analysis solves an uncoupled structural force-displacement problem. Specifying driven nodes for shells with acoustic pressures on both sides.
If the submodel analysis step time is different from the global analysis step time, use the TIMESCALE parameter to adjust the time variable for the driven nodes’ amplitude functions. Read data from job: The linear or nonlinear response hoa a global, structural model can be used to drive the acoustic response of a fluid region of any size if the forces exerted on the structure by the fluid are small. The following topics are discussed: For details, see Figure 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.
See the detailed flow chart in Figure Use one of the following options: Run a zolid transfer analysis of the global model, and write the nodal temperatures to the results or output database file. The distance checked against the specified exterior tolerance is shown in Figure The definition of initial conditions should be consistent between the global model and the submodel.
Global shell model of pipe-plate structure. Therefore, the tolerance value plays a significant role in such cases.
Shell-to-solid submodeling and shell-to-solid coupling of a pipe joint
Repeat this data line as often as necessary to specify fixed boundary conditions at different nodes and degrees of freedom. If necessary, use the approach shown in Figure 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 submodelnig freedom 8 along with the driven node set.
The specified temperature also affects temperature-dependent material properties, if any. Therefore, they must lie within or, as allowed by the exterior tolerance, near to two- or three-dimensional geometrically-defined elements dolid the global model. The step time used in these analyses can be different; the time variable of the amplitude functions generated at the driven nodes can be scaled to the step time used in the submodel. A thin layer of fluid elements, with the same properties as the submodel fluid, can be added to the global model; this element set and its nodes can then be used to drive the submodel in the usual manner.
Repeat this data line as often as necessary to specify boundary conditions at different nodes and degrees of freedom. The submodel is in good agreement with the displacement of the global shell model around the joint.
Online-Submodeling with Abaqus
Education Partner Training Click here for a listing of partner-led training classes. Magnified solid submodel of the pipe-plate joint. Solud is possible to define the results file output or nodal output to the output database file such that the information is written at different frequencies for different nodes, although that should not be done for nodes involved in the interpolation to define values at a driven node since ABAQUS will take values at the coarsest frequency only.
Taking advantage of the symmetry of the problem, only half the assembly is modeled. Mesh constraints must be used normal to an Eulerian boundary region to allow material to flow through the region. If the file extension is omitted, ABAQUS will correctly choose the extension if only the results file or the output database file exists.
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. Referring to the global model results from the submodel analysis.
To determine which global nodes are used to drive the submodel, do the following: Run a thermal-stress analysis of the submodel using the results or output database file for the global thermal-stress analysis to read the driven variables displacement field and using the results fo output database file from either the global heat transfer analysis or the global thermal-stress analysis to read the temperatures as field variables.
First degree of freedom constrained. If the distance between the driven nodes and the free surface of the global model falls within the specified tolerance, the solution variables from the global model are extrapolated to the submodel. The width of this zone around the reference surface where all displacement components are driven may be different for various driven nodes or node sets.
Set this parameter equal to the name that will be used to reference the boundary condition in user subroutine VDISP. The direction of the line is normal to a flat surface approximation to each shell element. If you run the submodel analysis in a newer version than the global model, the output database. Node definitions for hiw S4 global model.