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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The time scale cannot be specified in frequency domain analyses or in linear perturbation steps. The shell-to-solid coupling model is meshed with S4R shell elements and C3D20R continuum elements as shown in Figure 3.
Shell-to-solid submodeling and shell-to-solid coupling of a pipe joint
For shell-to-solid submodeling ABAQUS uses two kinds of tolerances to determine the relationship between the submodel and the global model. The static submodel is meshed using three-dimensional C3D20R continuum elements see Figure 2. Run a heat transfer analysis of the dhell model, and write the nodal temperatures to the results or output database file. To simplify calculations, the closest point in the global model is calculated as the intersection of a line drawn through the node on the submodel with the reference surface sjbmodeling the shell in the global model.
The scaling parameter is used in the second step.
The sehll model for the submodeling analysis is meshed with S4R elements as shown in Figure 1. Mode-based steady-state dynamics cannot be used at the submodel level. Output Field Output Requests Create: Thus, a single row of nodes transmits the transverse shear forces from the shell solution to the solid model. The assumptions depend on the geometric formulation used linear or nonlinear and on the procedure combination. The temperatures obtained from the results or output database file of the global heat transfer analysis are field variables in this case.
In shell-to-solid submodeling, the submodel is made up of solid elements and replaces a region where conventional shell elements are used in the global model. It is possible to define the results file output or nodal output to too 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.
Any magnitude given will be ignored when the boundary conditions are given as model data. Comparison of out-of-plane displacement in the continuum mesh plate for the submodel top and the shell-to-solid coupling analysis bottom. Similarly, the results will always be correctly interpolated when using the output database to transfer the results from the global model to the submodel, because the zero increment is always written to the output database.
The boundary nodes cannot lie in regions of the global model where there are only user elements, substructures, springs, dashpots, etc.
The difference in the maximum Mises stress between the submodel analysis and the shell-to-solid coupling solution see Figure 10 can be partially attributed to the fact that the global shell model ot more flexible than the shell-to-solid coupling model.
Use the temperature solution from the global heat transfer analysis to drive the solution of the submodel heat transfer analysis. Set this parameter equal to 1 default or 2. Sopid following types of submodeling are provided global-to-submodel: Geometry and model In this problem the joint between a pipe and a plate is analyzed. The normal to the flat surface is the average of the normals at the nodes of the shell element. Obtaining a solution at a particular point in time using linear perturbation analysis.
For solid-to-solid and shell-to-shell submodeling specify the individual degrees of freedom to be driven. The exterior tolerance in shell-to-solid submodeling. The stress concentration in the fillet radius is obtained for the solid models.
These requirements do not apply to quasi-static problems. A reference static solution consisting entirely of C3D20R continuum elements is also included see Figure 4. Submodeling with general and linear perturbation steps.
Education Partner Training Click here submodellng a listing of partner-led training classes. Shell-to-solid submodeling and shell-to-solid coupling of a pipe joint. If no mesh constraints are applied, an Eulerian boundary region will behave in the same way as a sliding boundary region. Element definitions for the C3D20R submodel that uses the S4 global model.
If the file extension is omitted and both results and output database files exist, the results file will be used. Include this parameter default to define the real in-phase part of the part of the boundary condition.
If a shell offset is defined in the global model, the shell thickness must be set equal to twice the maximum distance from the top or bottom shell surface to the shell reference surface. Submodeling is the technique used in Abaqus for analyzing a local part of a model with a refined mesh, based on interpolation of the solution from an initial global model usually with a coarser mesh onto the nodes on the appropriate parts of the boundary of the submodel. The global model in a submodeling analysis must define the submodel boundary response with sufficient accuracy.
In certain problems the acoustic pressure may act on both sides of a shell structure. Scale time period of global step to time period of submodel step. Comparison of the Mises stress in the continuum mesh plate for the submodel with scaled boundary condition top and the shell-to-solid coupling analysis with scaled load bottom. A coarser mesh using C3D8R elements is chosen for the dynamic tests.
Online-Submodeling with Abaqus
If the global model is defined in terms of an assembly of part instances, give the complete name—including the assembly and part instance names—when specifying the global element set. To determine which global nodes are used to drive the submodel, do the following: Hence, this area is modeled with continuum elements to gain a better understanding of the deformation and stress state.
The driven nodes for the submodel are the nodes lying on the specified surface. Specifying the driven nodes in acoustic-to-structure submodeling.