Composite laminate modeling predictive engineering. Element and property definition in nx nastran structural elements are defined on bulk data connection entries that identify the grid points to which the element is connected. In this video, i show you how to define such supports in femap using gap elements. From transient, to frequency, to random loading, to shock response, nx nastran covers the full range of dynamic solutions. The antitrust settlement allowed the 2003 purchase of a royaltyfree, perpetual license for the msc. This includes general knowledge of the nx nastran structure, commands, elements, materials, and loads. Contact in analysis almost always signals the use of a nonlinear solution. Introduction to advanced nonlinear in nastran femap with nx nastran duration. Rolewicz1 cornell university 15, ithaca, ny, 14850 nx nastran is a powerful finite element analysis fea software package used to solve linear and nonlinear models for structural and thermal systems. However, additional material is available for demonstration of. Nx nastran resulted from an ftc action against msc corporation for alleged antitrust activity.
Our fullvehicle nvh knowledge and expertise, combined with the. Further, this is a capability where raw performance adds significant value, and nx nastran provides an extensive array of options and capabilities that get the job done. Actully i have a cylinderical shape model having some parts inside which have contact with the cylinderical part. Create the gap elements between the node pairs 2, 8. Postprocessing tools and advanced reporting tools allow you to efficiently identify problem areas from your simulation results. If the coordinate system cid field is specified, the element coordinate system is established using that coordinate system, in which the element xaxis is in the t1 direction and the yaxis in the t2 direction. The method uses a gap the thickness of the adhesive, two rigid elements, and three zerolength spring elements between coincident nodes. Femci book finite element modeling of an adhesive in a. I have pressure acting in the radial direction and some spcs as boundary conditions. Nonlinear analysis with sol 106 nx software, training and.
One rigid element stretches from one adherend to a node at the center of the gap, while the second rigid element stretches from the other adherend to a coincident node also at the center of the gap. Nastran cbush element orientation stress ebook llc. This textbook explains how to perform computer aided analysis by using nx 10 advanced simulation with nx nastran solver. Table of contents iv advanced nonlinear solution theory and modeling guide 2. Online shopping from a great selection at books store.
The cgap element is intended for use in nonlinear static analysis. Nx nastran basic includes a complete element library including 1d, 2d and 3d low and higherorder elements. Femap tips and tricks instructions and videos demonstrations. Nonlinear analysis with sol 106 2015 predictive engineering page proprietary document, please do not copy or distribute 7 of 24 2. Overviewof nonlinearanalysis stress all spc 100 subcase 1 subtitle elastic load to 850. Gave enforced displacement on top plate in the direction perpendicular to the plate. I have pressure acting in the radial direction and some spcs as.
Is cgap and pgap element different because when i applied surface. In femap its possible to extrude element edges to create new shell elements. This fact sheet provides an overview of the analysis and solver capabilities of the nx nastran basic product. Recently i read something every interseting about gap elements. When translated to nastran, the geometry, material properties and loads will be translated to pshellcquad4. See, for example, timoshenko and gere, theory of elastic stability, mcgraw hill book.
As the user becomes familiar and comfortable with the use of nastran, he will want to use the more sophisti cated features of nastran. This will also occur if a model is solved in autodesk simulation using the nastran solver. The nx nastran element library describes the elements supported by nx nastran. I have done some simple static analysis that worked fine parts for hydraulic presses and injection units.
Keywords nx lifecycle simulation, nx nastran, fe solvers, cae, basic analysis, linear static analysis, nonlinear analysis, steady state thermal analysis, normal mode analysis, structural analysis, keynastran, nxnastranb, nxdigsimb. The environment immerses engineers with familiar nastran language for. This way, using the linear contact functionality of nx nastran, one gets compression only stiffness. Performing analyses with gap elements things to know before building the model some restrictions when using gap and surface contact elements referred throughout this page as gap elements in a static stress analysis with linear material models are as follows.
A snapshot of the gap element properties is shown below. According the nx nastran basic nonlinear analysis guide. Nx nastran fe solver analysis modules solution sequences. When the gap is closed and there is friction, the gap has the elastic stiffness kt in the transverse direction until the friction force is exceeded and slippage starts to occur.
Monica schnitger another fine mesh is a must for everyone interested in cfd. Discuss topics of finite element analysis on the aircraft industry environment. Basic beam simulation with nastran solver in nx siemens 10. Next, during gap property creation the local coordinate system is selected. When femap finishes meshing a model a brief report of the mesh quality is written to the messages pane. Nonlinear analysis cgap, pgap possible wrong answers when u0 is negative extended description use of a gap element tmax0. Concepts of computational finite elements and methods of static and dynamic analyses in msc. The most widely used nonlinear analysis incorporating contact between components is a great first step into the nonlinear world. Nx nastran gap element not working as intended nastran. Hi all, i have different models of the same geometry yet only an interior object has a different rotation. Jan 17, 2016 nastran cbush element orientation for the model on the right hand side is defined in the element property dialog box by selecting cid 0 see figure 1 above similarly, the nastran cbush element orientation for the elements in the model on the left hand side are defined using the x axis of the custom coordinate system vector method, see. Here is the access download page of nx nastran quick reference guide pdf, click this link to download or read online. Nx nastran is a finite element solver for stress, vibration, structural failure, heat. Please note this is only necessary when creating cgap elements with coincident nodes.
Individual stiffness values, damping coefficients and structural damping coefficients can be defined along each of the 6 degrees of freedom available with this element. However, additional material is available for demonstration of use with femap. Nx nastran is a finite element fe solver for stress, vibration, buckling, structural failure, heat transfer, acoustics and aeroelasticity analyses manufacturers as well as engineering suppliers in aerospace, automotive, electronics, heavy machinery, medical device, and other industries have relied on nx nastran software for their critical engineering computing needs for over 40 years. This is useful when there is no geometry or other edge surfaces available.
Additional details concerning the features and use of each of nx nastrans elements can be found in the nx nastran quick reference guide. Siemens nx nastran provides an important core component and technology backbone to the range of nx product simulation and validation tools within the general portfolio of product lifecycle. This example will use the nonlinear static solving capability of nx nastran. Nonlinear support with gap elements in femap youtube. Inventor nastran, formerly known as nastran incad, offers cadembedded finite element analysis software with an array of simulation and analysis features. After one year of cooperation with the nx nastran development team, i am pleased that our confidence has been well rewarded. It should be noted that the creation direction of all the bar elements, u2 u1, is in the negative y direction. During the analysis, the deformation of the model will cause the gap to close creating contact. I have modeled the gap elements and have strange results.
Nx nastran is part of the simcenter portfolio of simulation tools, and is used to solve structural, dynamics and acoustics simulation problems. The beam will have one end fixed, and the free end will be loaded with a force. Nx nastran is a program that solves most structural analysis problems for linear and nonlinear analysis, dynamics, acoustics, rotor dynamics, aeroelasticity and optimization. The course is designed to teach nx nastran independent of pre and post processors. Lesson 5 gap elements patran 322 exercise workbook 59 figure 6. With static structural analysis, it is possible to describe how to use nx nastran without. Further, this is a capability where raw performance adds significant value, and nx nastran provides an extensive. Nx nastran basic is the core subset of nx nastran software and includes a robust suite of linear statics, normal modes, buckling analyses, heat transfer and basic nonlinear capabilities. It is assumed that the user is familiar with nx nastran fundamentals pertaining to linear analysis. Contact problem involving dropping a hyperelastic material. It will produce a linear stiffness matrix for all other solutions.
Consider two grids on the xaxis with ga to the left of gb and the cid field blank and u0 specified to a negative value. Get nx nastran quick reference guide pdf file for free from our online library pdf file. Nx nastran commands and parameter settings needed to activate different analysis features are frequently mentioned. Worldwide sites you have been detected as being from. Element and property definition in nx nastran structural elements are defined on bulk data connection entries that identify the grid points to. Nonlinear support with gap elements in femap duration. Inventor nastran finite element analysis software autodesk. Nastran provides such a flexible array of analytical options, the user will find unending combinations of alternatives.
It starts with analyzing a cantilevered beam and builds up the readers understanding of the concepts and process of structural analysis. Nonlinear topics include large displacement, large strain, nonlinear materials plasticity, hyperelastic, and contact. For the importance of mesh consistency among different models, i am looking for a way to design similar mesh for the different cases orientation degrees for the interior slit. The value of nx nastran technology the virtual development of premium passenger cars consequently requires premium analysis tools. The nx nastran introduction to finite element analysis femap course is an introductory course for static finite element structural analysis using nx nastran.
The advanced nonlinear course is a comprehensive presentation of the nonlinear capabilities available in nx nastran solutions 601 and 701. Nonlinear analysis cgap, pgap the nastran secret book. This direction will be used later when we define the contact closure direction under element properties. Thick composite elements are not supported by nastran. You can model a lot of support nonlinearities with them.
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