SimAcademy Webinar Archive: Marc Adaptive Mesh Refinement

Because the results of FEA depend on the mesh, one always wants to generate a better one. With this in mind, this webinar will cover local refinement called adaptive meshing. Adaptive meshing is an automatic meshing strategy for improving results by adding elements in areas that meet specific error criteria. Adaptive meshing may be needed in regions that experiences high local stress/strain gradients, extreme element distortions, and incorrect boundary representation due to large deformation. Marc has a capability to perform local adaptive mesh refinement for improving the accuracy of the solution. The adaptive meshing is available for 2-D and 3-D elements. The adaptive mesh generation increases the number of elements and nodes to improve the accuracy of the solution. This capability is applicable for both linear elastic and nonlinear analysis.

SimAcademy Webinar Archive: MSC Nastran User Fatal Message 9050 - Excessive Pivot Ratios

Ask any MSC Nastran user what’s the most commonly found MSC Nastran fatal error message, and the answer will almost universally be: Excessive Pivot Ratios. Unfortunately, this error message’s description leaves many new users confused and not sure about how to solve this issue. This presentation will try to illustrate the most common causes for this error messages, and how to figure out how to diagnose a model with these flaws.

SimAcademy Webinar Archive: Adams/Solver Function Expression Tips, Tricks, and Resources

Adams/Solver features a rich run-time function language used in applied forces, motions, and measures. Most Adams and SimXpert Motion users know the basics but haven't used some of the newer and advanced functions. Experienced users have developed creative and efficient techniques for writing functions but those methods aren't often shared outside of small groups.

SimAcademy Webinar Archive: An Introduction to Virtual Mass Analysis Using MSC Nastran

The Virtual mass method has been available in MSC Nastran for a long time. It is used to model the additional mass that structure experiences when accelerating in contact with fluid. The VM method has several benefits making it an attractive method when dealing with certain problems involving fluids. For instance, there is no need to model the interior domain of the fluid, so no solid fluid mesh is required, only a simple list of elements, which are in contact with the fluid. If the fluid has a finite volume, a coordinate system defines, the orientation of the free surface of the fluid along with a location parameter define its offset from cord systems X-Y plane.

SimAcademy Webinar Archive: MSC Nastran Dynamics Solution Setup and Result Processing Using Patran

MSC Nastran has extensive dynamic functionalities. In this presentation, you will be exposed to setting up and post processing frequency and transient response using Patran.

SimAcademy Webinar Archive: Total Life and Crack Initiation in MSC Fatigue

Fatigue analysis usually refers to one of two methodologies: either the stress life (S-N method) or the local strain (strain-life (ε-N) method. It has been recognized that a metal subjected to a repeated or fluctuating load can fail at a stress level lower than that required to cause fracture on a single application of the load. The nominal stress (S-N) method was the first approach developed to try to understand this failure process. This method is still widely used in applications where the applied stress is nominally within the elastic range of the material, and the number of cycles to failure is large. The nominal stress approach is best suited to the area of the fatigue process known as high-cycle fatigue. The nominal stress method does not work well in the low-cycle region where the applied strains have a significant plastic component. In this region, a strain-based methodology must be used.

SimAcademy Webinar Archive: Flexible Body (.mnf) Generation and Verification Using Adams and MSC Nastran

Adams/Flex is a module for Adams/Solver which lets user incorporate flexible structures into their Adams models. This produces a higher-fidelity system representation that can result in more accurate system kinematics (displacements, velocities, accelerations) and dynamics (loading profiles). It is easy to produce the Modal Neutral Files (.mnf) required by Adams/Flex from MSC Nastran. This seminar will examine the contents of the MNF file format, the setup considerations in MSC Nastran and the ways to validate the resulting flexible body in Adams versus MSC Nastran.

SimAcademy Webinar Archive: Tire Models Comparison, Basic Theory, and Usage Scenario Discussion Using Adams

Tire/road interaction can be both highly complex and a dominant component in vehicle models for handling, durability, and ride analysis. Both in the open-ended Adams/View, and the template based Adams/Car, Adams users have access to several tire models, ranging to the simple Fiala model to high fidelity element based FTire model, and including special adaptations for motorcycles, aircraft and soft soil applications.

SimAcademy Webinar Archive: Restart in MSC Nastran

A restart is a logical way of continuing from a previous run without having to start from the beginning. The savings can be in terms of both time and money. You use some forms of restarts practically every day in your life--perhaps without realizing it. An example of a restart can be as simple as reading a book. Each time that you continue from where you left off is a restart. This analogy can be applied to MSC Nastran.

SimAcademy Webinar Archive: Advanced Thermal Analysis in MSC Nastran Using SOL400

MSC Nastran is the most widely used, and commonly recognized as the most trusted Finite Element Analysis (FEA) Solver. It excels in Dynamics, Structural, Thermal, Composites, Aeroelasticity and Optimization analysis. MSC Nastran 2012 has added features of multi-discipline analysis where various analyses can be coupled or chained.

SimAcademy Webinar Archive: Marc User Subroutine

Marc’s user subroutines enhance the software in allowing the users to perform robust functionalities that are not available in standard input format. These robust functionalities include user-defined material models, user-defined constraints and loads, user-defined properties for contact bodies, user-defined geometry, and user-defined output for post-processing.

SimAcademy Webinar Archive: Crack Propagation Fatigue

Study and analysis of crack propagation under fatigue loading is an essential component of a “Damage Tolerant” design. It assumes that considerable amount of life can be accounted for, with an existing defect. If the service loading conditions, material data and other critical modifying factors are known, then growth of crack in a structure can be modeled accurately, hence increasing the useful life of a structure.

SimAcademy Webinar Archive: Introduction to Poroelastic Materials in MSC Nastran

Vibroacoustics with poroelastic trim components involves complex multi-physics in terms of the solid-fluid interaction at the microscopic level, as well as its unique applications in finite-element based analyses. Porous materials are widely used in automotive NVH applications for noise suppression. FFT, with its software product, Actran, has broad experiences on acoustics in general and poroelasto-vibroacoustics in particular. The integration of Actran's technologies expands the capability of Fluid-Structural Interaction analysis in MSC Nastran. The goal of this capability is to enable MSC Nastran to perform the modal frequency analysis of trimmed structure, such as a trimmed car body, for vibroacoustic simulation.

SimAcademy Webinar Archive: Optimization Beyond Sizing - Topology, Topography, and Topometry

Design optimization refers to the search for a structural design that, in some sense, “optimal”, or “the best,” while varying structural parameters. Historically, the most common is sizing optimization. This is used to size airframes, thicknesses, bar/beam properties, etc., as interest is to save material when design is at final stage, however there are few other options available in optimization at concept level of Design, like Topology optimization. There are some specific areas where one can use Topometry & Topography optimization effectively.

SimAcademy Webinar Archive: Monitor Points in Nastran

Monitor points are convenient way to output data into F06 file. The MONITOR case control command is an output request for load summation, element results and displacement output requests beyond the normal case control commands of DISP, STRESS, etc. This is a convenient means to monitor: loads, element results and average motion at user specified location, coordinate system and apply user defined labels to the results. This is an alternative to the usual case control output requests. Monitor point output also provides a means of spot checking results written to the f06 while allowing results of DISP, STRESS, etc requests to be written to the xdb or op2 file.