In the Load section of the form, enter 1. as the Pressure. Note that’s in the defined material dialog box, you can change the material type from the default isotropic to one of the many material types supported by FEMAP. They are considered as lumped loads. One-element and two-element tests are performed to verify the loading options on all the faces of supported elements. The consistent loads are shown in Figure 9-28. From the context sensitive menus select New. Femap assigns random colors to all the individual properties. *Eng-Tips's functionality depends on members receiving e-mail. The equivalent loads at the grid points computed from the element loads are known as consistent loads, and they are calculated by applying the principle of virtual work. If you lump these loads equally to the grid points, the load at each node is P/2 for the CQUAD4, CTRIA3, CQUADR and CTRIAR, and P/3 for the CQUAD8 and CTRIA6. Blas Molero Hidalgo Distributed Loads ! Login. FEMAP Interface . Femap Tips and Tricks of the Moment: Resolution, Turning off ... the load distribution for the RBE2 element but that for the RBE3 defies simple logic if you don’t know the mathematical formulation. Thus, we can be confident that the loads were applied correctly, and at least the … "People get promoted when they provide value and when they build great relationships", TTFN Your web browser must have JavaScript enabled in order for this application to display correctly. The reason these are both checked is that Body Loads won't be included in the first (pre-analysis) check. The surface is modeled with shell element. IBERISA They are a function of the element types and the applied loads. The total magnitude of this load is the area under the loading diagram. Fortunately, you do not have to calculate this consistent load for the pressure load. Depending on the element, these lumped loads in general are not equal to the consistent loads. Required fields are marked *. Your email address will not be published. As you can see, they are substantially different from the lumped loads that were discussed in the previous paragraph. These different input methods enable FEMAP to distribute loads along the surface. A load of 26440 N is applied on the impactor in negative z-direction. This video illustrates a method of applying regional loads to a portion of geometry in Femap. A load P is to be applied evenly as an outward pressure load (P/A) to a surface of each of the four solid elements shown in Figure 9-28. In both Abaqus/Standard and Abaqus/Explicit tests, the elements are held fixed by kinematic coupling constraints as each face of each element is loaded with a combination of distributed … In this case, the lumped loads and consistent loads are the same for the CQUAD4 and CTRIA3. The thermal load simulates a contracting bolt length which produces a load that would be compared to the preload required in the specs, or to a value from a text such as Machinery's Handbook. Then check your reactions after the analysis using List / Output/ Query and select your support nodes, or create a free body diagram. As you can see, consistent loads are functions of the element types and applied loads. This same load is to be applied to six different elements-CQUAD4, CTRIA3, CQUAD8, CTRIA6, CQUADR, and CTRIAR. The coming decade will see faster replacement of fossil fuels with renewable energy, new utility-scale battery storage technologies and greater digitalization in modernizing aging power grids. Product feature detail Geometryinterfaces Femapoffersseamlessgeometryaccesstoanex-tensiverangeofmajorCADsystems,including: • ACISimport(CADgeometryisconvertedtoa This consistent load is generated automatically inside MSC Nastran by using the PLOAD4 entry. Selecting the m… Copyright © 1998-2021 engineering.com, Inc. All rights reserved.Unauthorized reproduction or linking forbidden without expressed written permission. By joining you are opting in to receive e-mail. First we’ll create the material data (aluminum alloy in this case). Note: A distributed load applied to the beam results in a smoother deformation in this area compared to the point loads – and therefore smoother beam deflection. The nice thing is that because it’s using the FEMAP data surface, the thermal and structural mesh sizing does not need to match. This document introduces Femap with NX Nastran by demonstrating an entire assembly analysis cycle. Part of the model is applying a load of 50lb in a 12" X 12" steel plate. To create a material, expand model tree in FEMAPs model info pane and right click on the material object. Figure 2– FEMAP Interface Figure 3– FEMAP Menu Menu Functions File load existing models, save model, importing and exporting, save image Tools Measure distances, check for coincident entities Geometry Generate geometry entities (Points, Curves, Surfaces, etc) anew or from existing versions (rotate, copy, reflect, etc.) What is your application? Ingeniero Industrial To demonstrate the creation of equation-based loading, we’ll use a water tank quarter model. 7. The analyses in this section test the traction load labels TRVEC and TRSHR using distributed element-based and surface loads. Thanks all for replying!! Figure 17: LS-DYNA model within Femap. Registration on or use of this site constitutes acceptance of our Privacy Policy. They are not the same for the CQUAD8, CTRIA6, CQUADR and CTRIAR. To begin, a finite element model is created from basic CAD geometry of a bracket assembly. Difference between force and force per area of FEMAP, Finite Element Analysis (FEA) engineering Forum, The Engineering Leader’s Guide to PDM & Data Management, An Introductory Guide to Cloud-Native Product Development, 2021 Power Generation and Renewable Energy Trends: Renewable Energy Technology Trends. Already a Member? An example is shown in the attached file. Due to the uniform distributed load, which is applied along the full beam length, it appears in the middle of span in the same way as in case of simply supported beam. Duties include fuselage design in CATIA V5 and static structural stress analysis in Femap. April 2011. Each chapter covers a unique capability of the program and includes inline examples of command uses. A Leader’s Guide for Using Cloud-Based Product Development Tools to Drive Teamwork and Innovation. If you have a plate with pressure exerted against it, it is force on a surface. In finite element analysis, the loads are often applied to the elements rather than to the grid points. ! The SPC forces are listed on page 9 of the NX Nastran results. Load case definition and management. The load distribution along each edge is -.0833P, .3333P and -.08333P, or a -1/4/-1 ratio, which is quite counter intuitive, especially for the sign change. The advanced bundle adds a wealth of advanced analysis types including aeroelasticity for aerodynamic load generation, superelements for model partitioning, DMAP for NX Nastran solution sequence customization and Distributed Memory Parallel (DMP) allowing … In order to obtain the correct load distribution, these loads need to be converted to consistent loads. I ran two analysis with the two different methods and the stress values are significantly different. Distributed loads (varying with respects to the coordinates of the nodes or elements) can be applied by means of an equation. Tobalcane WEB: http://www.iberisa.com Associativity between geometry and mesh. What exactly is the difference between a force and force per area on FEMAP? This load has the same intensity along its application. There are three basic types of load input values: Total, Per Area, and Per Node. MSC Nastran 2012 Linear Static Analysis User's Guide, Nonlinear Analysis in MSC Nastran to Reduce Design Bottlenecks, Multidisciplinary Solutions For Brake Squeal, Acoustic Simulation for Automotive and Heavy Equipment Industries, Adams 2021 Release Highlights- More Productivity while using FE Parts, Power event specific best practices by using event specific solver settings, MSC Software partners with Ingeciber to improve safety and innovation with simulation, Event sets and variants as FMU parameters for seamless interoperability, Event set and event browser support for custom events, Ford Motor Company Uses Digimat for NVH Optimization, Explore the Virtual Test Drive free online conference, Remembering Dr. Richard MacNeal – Co-Founder of MSC Software and MSC Nastran, Figure 9-27 Consistent Loads Due to Uniform In-Plane Element Edge Load, Figure 9-28 Consistent Loads Due to Uniform Loads on a Solid Element Face. The T2 reaction (force at grid point 1 in the y direction) is +660 lbs. Model Info Pane – Expanding and Collapsing Trees . The total load (P) is to be uniformly distributed along the edge of the element with an intensity of P/l, where l is the length of the edge. It is interesting to note that the loads are distributed as 1/6, 4/6, and 1/6 along the edge for the CQUAD8 and CTRIA6, which is quite different from the lumped load approach. For the CQUADR and CTRIAR, an additional moment Pl/12 is needed to arrive at the consistent loads. However, in general, this is not the case. Distributed loads on line elements. All of the content in this blog post has been directly extracted from Chapter 9 of the MSC Nastran 2012 Linear Static Analysis User's Guide. the force is acting in negative zdirection and increases along The same shape function that is used in deriving the element stiffness is used for arriving at this load-and hence the word consistent load. Define Equation-Based Loads in Femap 29 Sep, 2012 By: Alastair Robertson Femap Tips and Tricks: Apply hydrostatic loading to a water tank model. Loads and constraints: Geometry or finite element based. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework. Keep in mind it's good practice to check the sum of the forces you have applied using, Tools / Check / Sum Forces before your analysis. Please let us know here why this post is inappropriate. FAQ731-376: Eng-Tips.com Forum Policies, ~~~~~~~~~~~~~~~~~~~~~~ Learning Femap is divided into six chapters in the logical order of structural analysis. Blog de FEMAP & NX Nastran: http://iberisa.wordpress.com/. In other words, the shear force diagram starts curving at E with a linearly reducing slope as we move towards … When you convert these element loads to grid point loads, a common tendency is to spread them equally at the connected grid points. Distributed Load). The consistent and lumped loads are the same for the CHEXA (with eight nodes) and the CPENTA (with six nodes) for this case. Generally, forces tend to be applied to points, so if that's the case, then the stress would be expected to be different. You may then use FEMAP to export an input file to over 20 finite element codes. ... applied force and moment is distributed over the master (independent) nodes. Creating Load from Output (“Model, Load, From Output”): This will create a load from an output vector from a previous run. The consistent loads for the CHEXA (with 20 nodes) and CPENTA (with 15 nodes) are shown in Figure 9-28(c) and Figure 9-28(d), respectively. If you apply a load on femap by selecting "on surface", how is it different if you select "force" or "force per area"? If the areas used for force and pressure are different, then the stress ought to be different. The results for the cases using CQUAD8, CTRIA6, CQUADR, and CTRIAR are different from the results using CQUAD4 and CTRIA3. Figure 23: A simple supported beam is given an evenly distributed load across its top flange. Over what area are you "applying" the force? "If you avoid failure, you also avoid success." The consistent loads for each of these elements for a uniform in-plane edge load of P/l are shown next to each element. Your email address will not be published. I'm confused whether I should apply the load as a "force" or "force per area". For distributed loads that point up, the total load should be added to the shear, and for distributed loads that point down, the total load should be subtracted from the shear. Expand the Loads section of the Model Info tree and right click Load Definitions and select On Surface. Blas what you say makes a lot of sense, thanks a lot for you adivce. Let us look at an example of a typical plate element with uniform in-plane loading at one of the edges as shown in Figure 9-27. if you apply 50 lbs to a surface, FeMap will distribute that force over the area. I would like to know how I can apply an out of plane distributed load on a curved line which is part of a surface. to be identical. Nodal forces and moments. In the Create Loads on Surfaces dialog, select Pressure as the load type. All analysis parameters were set within Femap. There are three supplemental walk-through tutorials that help users jump right in. 1.1. Multipoint constraint equations (MPCs). So here it would be the load intensity time the beam length. 48011 BILBAO (SPAIN) Gathered loads and created a distributed load profile to get shear and moment diagrams. To quickly “Expand/Collapse” all sub-branches under a given branch in the tree, hold down the “Alt” key while clicking the “+/ -” box Also works when clicking a sub-branch such as “Loads” or “Constraints” or individual Load … Editor's Note: This tutorial courtesy of Siemens PLM. Director The load distribution along each edge is -.0833P, .3333P and -.08333P, or a -1/4/-1 ratio, which is quite counter intuitive, especially for the sign change. The intensity is given in terms of Force/Length 7 Distrubuted Loads Monday, November 5, 2012 Distributed Loads ! For this model we’ll select an aluminum alloy from the extensive metal alloy material database included with FEMAP. Velocities and accelerations. FEMAP can be used to create geometry, or you can import CAD geometry. This consistent load is generated automatically inside MSC Nastran by using the PLOAD4 entry. Consider another example with solid elements. Promoting, selling, recruiting, coursework and thesis posting is forbidden. Input Files Required ... Load and choose library mat_eng_mm-N-tonne-degC-Watts. Click Here to join Eng-Tips and talk with other members! The total loads include force, moment, and heat flux. The core value of SaaS is having a single source of truth for how data is stored, processed and accessed. If you have a load on the end of a cantilever beam, it is force at a point. This is telling us that the linearly varying distributed load between E and F will produce a curved shear force diagram described by a polynomial equation. Again, if you lump these loads equally to the grid points, the lumped load at each node is P/4 for the CHEXA (with eight nodes) and CPENTA (with six nodes), and P/8 for the CHEXA (with 20 nodes) and CPENTA (with 15 nodes). You should now select the surfaces that represent the wetted area of the model in the Entity Selection dialog. ! FEMAP automatically provides the integration that is necessary to link all aspects of your analysis. The R3 reaction (moment about the z axis) is +9780 lb. When the corresponding consistent loads shown in Figure 9-27 are applied to each of the respective elements, the force distributions are then equivalent for all the elements. Fixed (non-zero) displacements and rotations. The line connecting the two ends of the distribution on the shear force diagram will have a … Input the total load value, and FEMAP will automatically distribute it … Watch the video of this Femap tip on YouTube. “Luck is where preparation meets opportunity” Fortunately, you do not have to calculate this consistent load for the pressure load. In the displayed example, the magnitude of the applied forces varies with respect to the nodal y-coordinate (i.e. Thank you for helping keep Eng-Tips Forums free from inappropriate posts.The Eng-Tips staff will check this out and take appropriate action. When I select the area, the entire surface of the model gets selected which I don't desire. An introduction to managing your product development team’s most valuable design assets and preventing costly manufacturing errors. Constant or variable pressure. Distributed Loads Load - Pressure Load - Acceleration Load - Velocity Load - Enforced Displacement Load - Nonlinear Force Load - Heat Generation Load - Heat Flux Load - In this eBook, you’ll learn how a SaaS platform can immediately impact your company’s: Scalability, Data Security, Profitability, and Reliability. 13290 Evening Creek Drive South Prepared by: Date: Suite 250 San Diego, CA 92130 T 858.480.2000 Manager of Software Services F 858.792.8932 www.ata-e.com Introduction to The Femap … Since the geometry and boundary condition are identical for the six models, and the loads are “seemingly equivalent,” you will expect the results (displacements, stresses, etc.) I want to apply load for a small area in the entire model. Previously this would cause the load values to be zeroed on all elements other than the first where the load … The reason for this is because these “seemingly equivalent” loads are actually not quite equivalent. In most FEM there is force at a point (which is basically a vector) or force on a surface (which is pressure). FEMAP provides powerful tools for meshing geometry, as well as applying loads and boundary conditions. Examples of such loadings include the edge load on a CQUAD4 element or a pressure load on one of the faces of a solid element.