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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.

SimAcademy Webinar Archive: Overview of the MSC Nastran f04 file and DMAP

MSC Nastran is written in a high-level language called DMAP (Direct Matrix Abstraction Program) which has its own compiler and grammatical rules. During an analysis MSC Nastran produces a summary of the DMAP instructions as they are executed. This is known as the Execution Summary Table for the analysis and it is written to the .f04 file. This lecture will examine the Execution Summary Table and its various components. MSC Nastran provides the user with the ability to customize an analysis solution by modify the DMAP source. This lecture will introduce the user to the syntax of the DMAP commands and demonstrate how they interface with the solution.

SimAcademy Webinar Archive: Defining User Specified Crack Growth Criteria and Direction

MSC Marc is widely used in different industries for different applications. Its unique capabilities, including general contact, global adaptive remeshing, crack propagation and multi-physics, allow users to tackle difficult nonlinear simulation problems.

SimAcademy Webinar Archive: Leaf Spring Modelling in Adams Car

In Adams/Car we can create the leaf spring using the leaf spring (ltf) file. Data provide to the ltf file is in the unloaded condition. Adams/Car builds the leaf spring element and it actually uses makeleaf program in background. The present webinar will talk about the leaf spring editor in the leaf spring property files, communicators required for connection of leaf spring with subsystem like suspension and body and how to create the leaf spring with more than 10 leaves.

SimAcademy Webinar Archive: Doing it Explicitly - Introduction to Explicit Analysis and Capabilities of SOL700

Finite Element Analysis (FEA) problem involving non-linearity can be solved by either implicit or explicit solution technique. Finite Element Analysis (FEA) involving simulating short-time large deformation problems such as complex contact/impact problem are solved by explicit solution technique. SOL700 is a powerful explicit solver of MSC Nastran which is based on Dytran+LS-Dyna module. So it offers combined advantages of both Dytran & LS-Dyna. The present webinar will talk about basics of explicit analysis, where to use it & the capabilities of SOL700.

How to Find Cross Section Properties in Patran for Complex Shape

Customer would like to use Patran to calculate cross section properties for arbitrary shapes... but in particular, where there is a 'hole' in the cross section. This is more difficult than the standard shapes, so a brief recording is provided to lay out the steps and considerations.

SimAcademy Webinar Archive: Patran Fringe Results Processing

This webinar discusses contour results processing in patran and the associated settings in a Fringe plot along with the usage of Patran Ranges and its modification. A small demonstration will be shown on these topics.

SimAcademy Webinar Archive: Bonora Damage Model

Finite element modeling has been widely used to predict the failure. One such technique is a progressive failure analysis (PFA). However the limitation of progressive failure analysis is that it assumes material to be linear elastic up to the point of failure. To deal with failure analysis of ductile materials there are various damage models available in MSC Marc. One such damage model is Bonora model which is used to predict the ductile damage in materials that are subjected to large plastic deformation that typically occurs in manufacturing processes.

SimAcademy Webinar Archive: Contact Pair Modeling – New Approach to Contact Model Setup in Patran 2013 with MSC Nastran 2013.1

Patran 2013 supports the new MSC Nastran 2013.1 contact pair user interface by providing a new Contact Pair Load and Boundary Condition (LBC) graphical user interface. The interface allows users to create contact pairs using individual contact property sets, or re-use existing interface definitions by referencing existing property sets. This capability, along with Patran's global property editing capability, provide a powerful, scalable UI that is suited equally well to creating both individual contact pairs, and large numbers of complex contact pairs, using common properties. Along with the new contact pair user interface is a set of tools that allow users to automatically create contact bodies and contact pairs based on user-defined criteria.

SimAcademy Webinar Archive: Nastran Embedded Fatigue (NEF) – Capabilities and Applications

Fatigue failures are often identified through testing. However, since the advent of FE based stress solvers, starting with Nastran in the 1960’s, attention has focused on the concept of FE based fatigue calculation procedures. MSC Fatigue (1990) was the first such commercial package of similar commercial FE based tools. These methods, both test and FE based, treat the fatigue calculation process as a post processing task and this has been an accepted convention throughout. Now in the recent time, MSC Nastran Embedded Fatigue (NEF) breaks this convention by coupling the stress and fatigue calculation process into one simultaneous operation. This new capability has wide ranging implications in fatigue and reliability in large mechanical engineering. By combining the two separate processes into one simultaneous process the need for any kind of intermediate data is removed. Such intermediate files can sometimes be a limiting factor in the size of model that can be handled.

SimAcademy Webinar Archive: Defining and Attaching External Super Elements Using Two Step Method

The limits on hardware resources, combined with budget restrictions (large runs and stochastic variations can be time-consuming), limits the ability of engineers to solve large, complicated problems with high fidelity meshes. A solution to these problems (both hardware and time budget), can be achieved for many models by using superelements in MSC Nastran. By using superelements, the analyst can not only analyze larger models (including those which exceed the capacity of your hardware), but he can also become more efficient in performing the analysis, thus allowing more analytical design cycles or iterations in the analysis. Another benefit of superelements efficiency can be realized when models are subjected to probabilistic or stochastic analysis by varying portions of the structure.