October 16, 2020 at 4:17 pmfrancescone96Subscriber
I started another discussion yesterday on the same analysis, but this time the problem is
slightly different: i have a 2D geometry and i want a plane strain state. I click on the "plane strain" window as in the following figureOctober 19, 2020 at 12:55 pmTomPhemmySubscriberI doubt that the use of the enhanced strain formulation is the cause of your problem. Those internal degrees of freedom help to also capture bending stress that linear elements are known to be bad at.nNow back to your question, you can change the element technology by setting the following: n!TURN OFF AUTOMATIC SELECTION OF ELEMENT TECH nETCONTROL,OFF, ON n!SET THE ELEMENT TO PLANE 182 WITH WITH FULL INTEGRATION nET,MATID,PLANE182nKEYOPT,MATID,1,0n!SET THE BEHAVIOUR TO PLAIN STRAIN nKEYOPT,MATID,3,2nnmaybe if you share more details about your problem and show geometry and BC, i ca better understand your problem. nOctober 20, 2020 at 7:53 amfrancescone96SubscriberThank you a lot for the APDL command and for the fast reply. nHowever i still get strain along Z. Do i have to insert the APDL command on the geometry of the body? n The problem is a 2D disk (i'm really sorry i'm not allowed to share pics of the problem despite is very simple) and in transient structural i'm evaluating the circumferential stress of the disk with the time. nThe load comes from a thermal transient analysis in fluent, i export the thermal field for each time-step. The stress comes from the temperature gradient along the radius of the disk. nAs i said i need to get plain strain from this analysis, so the strain along z (normal direction of the plane) has to be zero. I also tried to make the mesh in APDL and then exporting it to workbench, but it did not work. No constraints are applied. nOctober 20, 2020 at 10:03 amfrancescone96SubscriberI solved the problem by modifying the material model: i changed the coefficient of thermal expansion from isotropic to orthotropic by putting the coefficient of thermal expansion along z equal to zero. In this way i do not get any thermal expansion along the normal direction and so thermal strain. As i read in literature the stress sigma has to be non-zero and is what i get. nCould this be correct?nOctober 20, 2020 at 6:49 pmTomPhemmySubscriberHello, nGlad to know you have solved your problem. I think what you have done is correct. In the apdl theory reference (page 6, v19.2) , you will find that ansys allows for different coefficient of thermal expansion in the element basis direction so i suspect that by using the orthotropic option and setting that coefficient to zero in z direction, no thermal strains are generated in that direction. That makes sense to me.You are correct, the stresses in the plain strain are nonzero in z direction. at least for linear elasticity you can check this from elementary calculations.Viewing 4 reply threads
Ansys Innovation Space
- You must be logged in to reply to this topic.
Simulation World 2022
Check out more than 70 different sessions now available on demand. Get inspired as you hear from visionary companies, leading researchers and educators from around the globe on a variety of topics from life-saving improvements in healthcare, to bold new realities of space travel. Take a leap of certainty and check out a session today here.
Earth Rescue – An Ansys Online Series
The climate crisis is here. But so is the human ingenuity to fight it. Earth Rescue reveals what visionary companies are doing today to engineer radical new ideas in the fight against climate change. Click here to watch the first episode.
Subscribe to the Ansys Blog to get great new content about the power of simulation delivered right to your email on a weekly basis. With content from Ansys experts, partners and customers you will learn about product development advances, thought leadership and trends and tips to better use Ansys tools. Sign up here.Trending discussions
- How to calculate the residual stress on a coating by Vickers indentation?
- An Unknown error occurred during solution. Check the Solver Output…..
- Saving & sharing of Working project files in .wbpz format
- Solver Pivot Warning in Beam Element Model
- Understanding Force Convergence Solution Output
- whether have the difference between using contact and target bodies
- Colors and Mesh Display
- The solver engine was unable to converge on a solution for the nonlinear problem as constrained.
- Massive amount of memory (RAM) required for solve
- What is the difference between bonded contact region and fixed joint
Top Rated Tags
© 2022 Copyright ANSYS, Inc. All rights reserved.Ansys does not support the usage of unauthorized Ansys software. Please visit www.ansys.com to obtain an official distribution.