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How to add your knowledge
Help: About in FEMPRO identifies the software as
FEMPRO V22.1
Build 22.01.00.0096 29-Aug-2008
The About FEMPRO title bar indicates whether the 32-bit or 64-bit version is being used.
CAD Interfacing and Meshing
- Enhanced the associativity of units between the CAD model and FEMPRO model. Previously, transferring the CAD model to FEMPRO set all the units (force, length, time, and so on) even though the CAD model may not use all these units. Thus, changing the units in FEMPRO and transferring the model again from CAD to FEMPRO would reset the units. Now, only the length units are associative with the model. See Opening Models: Opening CAD Files: Import CAD Solid Models with CAD Application for details.
- Enhanced the associativity of material properties between the CAD model and FEMPRO model. Previously, transferring the CAD model to FEMPRO would overwrite all the material properties for the parts. Now, a prompt will let the user decide whether to retain the FEMPRO material properties or not. See the page General Options: Using the Tools Pull-Down Menu: Options Dialog: CAD Import Tab for setting a default answer to the prompt.
- When generating a fluid volume from the CAD model (Mesh: Fluid Generation), deactivated parts are no longer considered. Previously, the fluid generation was based on all parts, activated and deactivated.
- Alibre Design version 11 now supports assembly-level features. Thus, changes made in the assembly are transferred to FEMPRO via InCAD. The changes do not need to be made to the individual parts.
Documentation
- Added various modeling suggestions for Mechanical Event Simulations, such as
- Using prescribed displacements to simulate velocity and acceleration. (See the page Setting Up and Performing the Analysis: Nonlinear: Loads and Constraints: Prescribed Displacement.)
- Using a coarser mesh to prevent element distortion. (See the page Analysis Types: Nonlinear: Modeling Considerations.)
- Speeding up surface-to-surface contact by choosing the appropriate contact type. (See the page Setting Up and Performing the Analysis: Nonlinear: Loads and Constraints: Surface-to-Surface Contact: Tips.)
- Added figures to illustrate thermal contact at a junction where surface contact and bonded contact exist. The thermal contact elements are not created at the nodes that are bonded. See the paragraph Thermal Contact Resistance on the page Meshing Overview: Contact Pairs for details.
- Added a description of the text Annotations in the Results environment. See the page Results: Results Environment: Browser Tree Functions for details.
- Added a keystroke example of transient coupled fluid flow and thermal. See the page Examples: Multiphysics: Transient Coupled Analyses of Jacketed Pipes.
FEA Editor Environment
- When using the 2D mesher on multiple parts, the sketch under each part needs to be selected. This task is now easier: simply right-click on the drawing plane under the Planes branch of the tree view and choose Select all Sketches. Naturally, if some sketches are not needed in the selection, hold the <Ctrl> key and click on the individual sketch to toggle its selection status.
- Previously, the user only had full control over the orientation of axis 2 for beam elements. The other axes were set automatically and could not be changed. Now, the user can change the orientation of axis 1 (for both beam and spring elements). Select the elements to change (Selection: Select: Lines), right-click, and choose Beam Orientations: Invert I and J Nodes. This now provides full control over the orientation of beam and spring elements. (Recall that beam element's axis 3 are set by the right-hand rule from axes 1 and 2.) For details, see the paragraph Beam Element Orientation on the page Setting Up and Performing the Analysis: Linear: Element Types and Parameters: Beam Elements or the corresponding page under Beam Elements.
- Enhanced the display of local element orientations, axes 1, 2, and 3. Any combination or all three axes can now be displayed for beam elements, and the axis 1 orientation can now be shown for spring elements. Use the View: Options: Element Orientations command.
- Corrected a problem with bonding between multiple parts, such as beam elements connected to other element types. Previously, some of the parts may not have been bonded, especially when more than two parts met at a node, or when some of the parts that met were deactivated and other parts remained activated.
- Corrected a problem with the material library manager and the units of mass. Instead of deriving the units of mass, the material library manager was permitting the customer to define the units of mass. This could lead to the wrong value of mass density being added to the library. The proper units of mass, in ALGOR's force-based system of units, is force xtime2/length (=weight/gravity).
Mechanical Event Simulation and Nonlinear Static Stress
- Corrected two problems with the thin shell (element type of Shell, Type of shell element on the Element Definition set to Thin).
- Although the Analysis Type on the Element Definition was set to Small Displacement, previous versions may have behaved as if Large Displacement had been selected. Thus, nonlinear geometric effects (changing the stiffness matrix due to deflection) could be included in the analysis. Two conditions that caused this problem were using prescribed displacements in the model and applying a pressure or traction load to the thin shell. Prescribed displacements made the last part nonlinear. (A graph of the displacement results will indicate in most analyses whether the analysis used small displacement, linear deflection calculations or large displacement, nonlinear deflections.)
- The stress calculations for the thin shell elements were incorrect when Small Displacement was selected and the analysis used the setting (that is, did not include nonlinear geometric effects).
- Corrected problems with 2D orthotropic elements and orienting the material axes. The results were incorrect when the material axis direction was oriented using the Y Direction and Z Direction vectors. When using the Material Axis Rotation Angle, the angle entered by the user (in degrees) was not converted to the units required by the processor (radians).
- Enhanced the ability to enter repeating laminas in the laminate stacking sequence for composite elements. The Copy Row button now supports copying multiple rows.
Other
- Corrected a problem that prevented exporting a model to NASTRAN.
- Enhanced the importing of ALGOR pre-release 12 dot nothing models. The new method corrects a problem with the cross-sectional data for beam elements, marks the Element Definition and Material properties as completed, and creates a FEMPRO .fem file directly. See the page Opening Models: Open Autodesk Simulation Models for details.
- Enhanced Design Optimization to support multiple design scenarios. Thus, different design scenarios within the same model can be optimized without overwriting other optimizations.
PV/Designer
- When creating a solid mesh, the surface numbers of the interior surface, exterior surface, and interior lines are all different. Thus, loads and boundary conditions are now easier to apply. (Previously, the entire mesh was the same surface number.)
- When exiting PV/Designer, the user is now given an option to save the changes or to cancel.
Results Environment
- Previously, the calculations shown in the Inquire: Distance and Angle dialog were static. To see the resulting calculations for a different time step or load case, the dialog needed to be closed, change the time step, and then redo the Distance and Angle command. Now, the calculations are updated automatically when the time step or load case is changed.
- The display of MES 2D element material orientation (Display Options: Show Orientation Marks: Material Axis Orientation) has been corrected when the input on the Element Definition specifies a Material Axis Rotation Angle. In version 22, the material axis was shown as if the angle was measured from the global Y axis. In reality, the angle is measured from the element's local 1 axis.
- The display of linear membrane element material orientation (Display Options: Show Orientation Marks: Material Axis Orientation) has been corrected when the input on the Element Definition specifies a Material Axis Rotation Angle.
- Results can now be mirrored. This is especially beneficial for showing a complete model when the analysis took advantage of symmetry.
(a) A half-symmetry analysis of a frame
(b) looks like a full frame when mirrored in the Results environment. (The yellow mirror plane is shown in this figure. It can be hidden if desired.)
- Corrected a problem with selecting faces in a 2D model and inquiring on the results. If a rectangle selection were used, then extra faces used to create the 3D visualization of the 2D model would also be selected. Inquiring on the results of the faces, such as heat flow rate and fluid flow rate, would include the results from the 2D face and the extra face, which would then affect operations such as summing the flows to get the total.