Tagged: aim tutorial, discoveryaim, structures


September 26, 2022 at 10:00 amWatch & LearnParticipant
ï»¿This exampleÂ isÂ taken fromÂ Cornell Universityâ€™s ANSYS AIM Learning Modules
Problem Specification
A simplysupported 3D signpost with a cylindrical crosssection is subjected to the following combined loading situation.
x1 = 6 ft, z1 = 4 ft, b2 = 13 ft, h1 = 28ft, h2 = 8ft;
The system is subjected to the following external loads:
Wz1 = weight per unit length of the sign = 900 lb/ft, Wx2 = spatially variable wind load in the xdirection = 700*z lbs,
Fy1 = net wind force in the ydirection = 8000 lb, and Fz1 = net weight of the post (using a specific weight of 490 lb/ft^3)
The signpost is made of steel, which is a homogeneous and isotropic material (same properties at all points and in all directions) with Youngâ€™s modulus E= 3.0e7 psi, Poissonâ€™s ratio of 0, and a density of 490 lb/ft^3. It is assumed that the post is a solid cylinder of diameter, d. It is further assumed that after loading, the signpost will remain in its elastic range. This means that when the external load is removed, the material will return to its original shape without suffering permanent deformation.
Using ANSYS AIM, design the post so that the total combined normal stresses and combined shear stresses do not exceed allowable values. Assume allowable stresses of 25 ksi and 16 ksi for normal and shear stress, respectively, which already account for an appropriate factor of safety.
Learning Goals
The purpose of this tutorial is to showcase how fully threedimensional analysis can be applied to capture both stress states from simple combined loading as well as stress concentrations in the vicinity of sharp and/or reentrant corners and other neardiscontinuities in geometry.
PreAnalysis
This problem requires a relatively straightforward application of linearly superposed solutions from individual loadings. A simple spreadsheet can be prepared to give the results for the stresses associated with the separate loadings experienced by the signpost. An example is given here for the case of a solid post with a diameter of 1.12 feet:
Note that the formula for the moment about the xaxis is highlighted and shown in the formula bar above the spreadsheet. Not surprisingly, the stresses are quite low as solid posts are almost never used in practice. You may wish to begin with this case of an overdesigned signpost. The tutorial contains geometry files for both solid and hollow poles. Then you will want to consider hollow poles and compare results as you attempt to optimize the postâ€™s loadcarrying capacity.
Geometry
Download Solid Signpost geometry
Download HollowÂ Signpost geometry
The video below shows the steps necessary to import and prepare the geometry.
Mesh
The following video shows how to create a basic mesh for the sign and post using size and element shape controls.
Physics Setup
The video below demonstrates how to specify the materials and boundary conditions. Â Instead of the spatially varying wind load in the problem description, we will specify a uniform pressure for WX2 equal to the maximum value, which is a worstcase scenario.
Results Evaluation
The following video shows how to compute and analyze your results.

Introducing Ansys Electronics Desktop on Ansys Cloud
The Watch & Learn video article provides an overview of cloud computing from Electronics Desktop and details the product licenses and subscriptions to ANSYS Cloud Service that are...
How to Create a Reflector for a Center HighMounted Stop Lamp (CHMSL)
This video article demonstrates how to create a reflector for a center highmounted stop lamp. Optical Part design in Ansys SPEOS enables the design and validation of multiple...
Introducing the GEKO Turbulence Model in Ansys Fluent
The GEKO (GEneralized KOmega) turbulence model offers a flexible, robust, generalpurpose approach to RANS turbulence modeling. Introducing 2 videos: Part 1Â provides background information on the model and a...
Postprocessing on Ansys EnSight
This video demonstrates exporting data from Fluent in EnSight Case Gold format, and it reviews the basic postprocessing capabilities of EnSight.
 Discovery AIM tutorial – 3D FiniteElement Analysis of a Bike Crank
 FAQ: Missing Areas of the User Interface in Discovery Live
 Discovery Live: How to change units
 FAQ: Discovery SpaceClaim and Discovery Live offline help document
 Discovery SpaceClaim: Getting Started Tutorials
 Discovery AIM – Scaling deformation contour results
 Discovery AIM – Butterfly Valve With Reed Flow Sensor FluidStructure Interaction HowTo
 Discovery Live: Internal Fluid Flow with Thermal Effects
 Discovery AIM – Determining Die Lip Shape Using a Polymer Extrusion Simulation
 Introduction to recording and replaying scripts in SpaceClaim
Â© 2024 Copyright ANSYS, Inc. All rights reserved.