[Mechanical] 2-D analysis with axial force
I have a long tubular pressure vessel with material bonded to the inside. I want to do a 2-D x-section to look at stresses on the inner bore surface. The cross-section of the part has a funky pattern like this: https://www.nakka-rocketry.net/th_pix/grains1.gif Because of the shape I cannot use an axisymmetric model. When the inner bore is pressurized the vessel also experiences an axial load from the pressure.
I see the 2-D plane strain and plane stress analysis types, but they do not take account the axial forces. Is there a 2-D analysis type that can include axial forces? I also see the generalized plane strain, but that looks like it only takes into account rotations on the ends.
Aaron C. Caba, Ph.D.
Sr. Principal R&D Engineer
BAE Systems, Inc.
4050 Peppers Ferry Road, Radford VA 24143-0100
www.baesystems.com
-----Original Message-----
From: Caba, Aaron (US) via Xansys xansys-temp@list.xansys.org
Sent: Tuesday, July 20, 2021 2:27 PM
To: XANSYS Mailing List Home xansys-temp@list.xansys.org
Cc: Caba, Aaron (US) Aaron.Caba@baesystems.com
Subject: [Xansys] Re: APDL Scripting in Workbench - Problem 1
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Sayed,
First, please read the mailing list posting instructions for the mailing list at xansys.org, and post your full name with every post.
Second, the tutorial is for ANSYS 7.0 which was released in 2005 and is completely incompatible with the Workbench interface for ANSYS that you are using. Find a tutorial for your current version of ANSYS.
Aaron C. Caba, Ph.D.
Sr. Principal R&D Engineer
BAE Systems, Inc.
4050 Peppers Ferry Road, Radford VA 24143-0100 www.baesystems.com
-----Original Message-----
From: syed.haqqi@graduate.curtin.edu.au syed.haqqi@graduate.curtin.edu.au
Sent: Monday, July 19, 2021 2:45 AM
To: xansys-temp@list.xansys.org
Subject: [Xansys] APDL Scripting in Workbench - Problem 1
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Hi,
I am trying to learn APDL scripting an Ansys Workbench. I am following the tutorial at https://sites.ualberta.ca/~wmoussa/AnsysTutorial/C...
I have written scripts as shown in the images below. I cannot understand how to make a Keypoint in DesignModeler (DM). I have made two points and a line body from the two points. Then I allocated a rectangular shape from "Create" tab in. There are different types of errors and warnings. Can anyone please help me as in the Solution Information, solver deletes the Modulus of Elasticity and gives me pivot points errors. Since nothing was working, I have also fixed points. How can I mark a point as Keyword in Workbench. I am using Ansys 2021.\ Also, I need a vey good explanation of Real constants and what role do they play.\ I shall be grateful for all the help. I have attached WB file to download and see what I have done wrong.
Thanks and Regards
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I figured it out. I made a 3-D slice that is one element thick. Coupled all the axial DOF on the faces together with a command snip and applied a force to the coupled faces.
Aaron C. Caba, Ph.D.
Sr. Principal R&D Engineer
BAE Systems, Inc.
4050 Peppers Ferry Road, Radford VA 24143-0100
www.baesystems.com
-----Original Message-----
From: Caba, Aaron (US) via Xansys xansys-temp@list.xansys.org
Sent: Friday, July 23, 2021 11:14 AM
To: XANSYS Mailing List Home xansys-temp@list.xansys.org
Cc: Caba, Aaron (US) Aaron.Caba@baesystems.com
Subject: [Xansys] [Mechanical] 2-D analysis with axial force
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I have a long tubular pressure vessel with material bonded to the inside. I want to do a 2-D x-section to look at stresses on the inner bore surface. The cross-section of the part has a funky pattern like this: https://www.nakka-rocketry.net/th_pix/grains1.gif Because of the shape I cannot use an axisymmetric model. When the inner bore is pressurized the vessel also experiences an axial load from the pressure.
I see the 2-D plane strain and plane stress analysis types, but they do not take account the axial forces. Is there a 2-D analysis type that can include axial forces? I also see the generalized plane strain, but that looks like it only takes into account rotations on the ends.
Aaron C. Caba, Ph.D.
Sr. Principal R&D Engineer
BAE Systems, Inc.
4050 Peppers Ferry Road, Radford VA 24143-0100 www.baesystems.com
-----Original Message-----
From: Caba, Aaron (US) via Xansys xansys-temp@list.xansys.org
Sent: Tuesday, July 20, 2021 2:27 PM
To: XANSYS Mailing List Home xansys-temp@list.xansys.org
Cc: Caba, Aaron (US) Aaron.Caba@baesystems.com
Subject: [Xansys] Re: APDL Scripting in Workbench - Problem 1
External Email Alert
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Sayed,
First, please read the mailing list posting instructions for the mailing list at xansys.org, and post your full name with every post.
Second, the tutorial is for ANSYS 7.0 which was released in 2005 and is completely incompatible with the Workbench interface for ANSYS that you are using. Find a tutorial for your current version of ANSYS.
Aaron C. Caba, Ph.D.
Sr. Principal R&D Engineer
BAE Systems, Inc.
4050 Peppers Ferry Road, Radford VA 24143-0100 www.baesystems.com
-----Original Message-----
From: syed.haqqi@graduate.curtin.edu.au syed.haqqi@graduate.curtin.edu.au
Sent: Monday, July 19, 2021 2:45 AM
To: xansys-temp@list.xansys.org
Subject: [Xansys] APDL Scripting in Workbench - Problem 1
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Hi,
I am trying to learn APDL scripting an Ansys Workbench. I am following the tutorial at https://sites.ualberta.ca/~wmoussa/AnsysTutorial/C...
I have written scripts as shown in the images below. I cannot understand how to make a Keypoint in DesignModeler (DM). I have made two points and a line body from the two points. Then I allocated a rectangular shape from "Create" tab in. There are different types of errors and warnings. Can anyone please help me as in the Solution Information, solver deletes the Modulus of Elasticity and gives me pivot points errors. Since nothing was working, I have also fixed points. How can I mark a point as Keyword in Workbench. I am using Ansys 2021.\ Also, I need a vey good explanation of Real constants and what role do they play.\ I shall be grateful for all the help. I have attached WB file to download and see what I have done wrong.
Thanks and Regards
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On Jul 23, 2021, at 10:13 AM, Caba, Aaron (US) via Xansys xansys-temp@list.xansys.org wrote:
I see the 2-D plane strain and plane stress analysis types, but they do not take account the axial forces. Is there a 2-D analysis type that can include axial forces? I also see the generalized plane strain, but that looks like it only takes into account rotations on the ends.
Um…if you include the axial loading it'd be three-dimensional as far as ANSYS is concerned, but it sounds like it's actually 2D with a statically determinate constant out-of-plane load like the longitudinal stress in a cylindrical pressure vessel. Seems to me that the axial stresses don't affect anything in the 'hoop' direction—they don't for things like pipes and cylindrical pressure vessels. Maybe you can add in the axial load in with a post-processing macro.
Christopher Wright P.E. (ret'd) |"They couldn't hit an elephant at
chrisw@skypoint.com | this distance" (last words of Gen.
| John Sedgwick, Spotsylvania (1864)
http://www.skypoint.com/members/chrisw/
Chris,
Um…if you include the axial loading it'd be three-dimensional as far as ANSYS is concerned
That's the conclusion I came to. I was just wondering if there was a whiz-bang APDL command that would apply the axial load to a 2-D model -- guess not.
I ended up with a 2 element thick slice to deal with the 3-D loading and inner bore geometry. It lets me mesh with bricks, and it runs super fast, just not quite as fast as a 2-D model.
Seems to me that the axial stresses don't affect anything in the 'hoop'
direction—they don't for things like pipes and cylindrical pressure vessels.
Very interesting! I re-ran the model in both a plane-stress state and with an axial load. The axial load case increases the max deflection and stress results by about 0.7%. So not really enough to worry about, given the uncertainty in my material properties.
Aaron C. Caba, Ph.D.
Sr. Principal R&D Engineer
BAE Systems, Inc.
4050 Peppers Ferry Road, Radford VA 24143-0100
www.baesystems.com
-----Original Message-----
From: Christopher Wright chrisw@skypoint.com
Sent: Friday, July 23, 2021 2:29 PM
To: XANSYS Mailing List Home xansys-temp@list.xansys.org
Subject: [Xansys] Re: [Mechanical] 2-D analysis with axial force
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On Jul 23, 2021, at 10:13 AM, Caba, Aaron (US) via Xansys xansys-temp@list.xansys.org wrote:
I see the 2-D plane strain and plane stress analysis types, but they do not take account the axial forces. Is there a 2-D analysis type that can include axial forces? I also see the generalized plane strain, but that looks like it only takes into account rotations on the ends.
Um…if you include the axial loading it'd be three-dimensional as far as ANSYS is concerned, but it sounds like it's actually 2D with a statically determinate constant out-of-plane load like the longitudinal stress in a cylindrical pressure vessel. Seems to me that the axial stresses don't affect anything in the 'hoop' direction—they don't for things like pipes and cylindrical pressure vessels. Maybe you can add in the axial load in with a post-processing macro.
Christopher Wright P.E. (ret'd) |"They couldn't hit an elephant at
chrisw@skypoint.com | this distance" (last words of Gen.
| John Sedgwick, Spotsylvania (1864) http://www.skypoint.com/members/chrisw/
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Well, I suppose the axial load may cause some through-thickness strain (thinning of vessel wall) due to Poisson’s effect.
--
Mitch Voehl
CEO and Engineering Consultant
Summit Analysis, Inc.
78748 410th Ave
Lakefield, MN 56150
651-287-2360
www.summitanalysis.com
Specializing in the use of ANSYS (R) finite element analysis software
On July 23, 2021 2:47 PM Caba, Aaron (US) via Xansys xansys-temp@list.xansys.org wrote:
Chris,
Um…if you include the axial loading it'd be three-dimensional as far as ANSYS is concerned
That's the conclusion I came to. I was just wondering if there was a whiz-bang APDL command that would apply the axial load to a 2-D model -- guess not.
I ended up with a 2 element thick slice to deal with the 3-D loading and inner bore geometry. It lets me mesh with bricks, and it runs super fast, just not quite as fast as a 2-D model.
Seems to me that the axial stresses don't affect anything in the 'hoop'
direction—they don't for things like pipes and cylindrical pressure vessels.
Very interesting! I re-ran the model in both a plane-stress state and with an axial load. The axial load case increases the max deflection and stress results by about 0.7%. So not really enough to worry about, given the uncertainty in my material properties.
Aaron C. Caba, Ph.D.
Sr. Principal R&D Engineer
BAE Systems, Inc.
4050 Peppers Ferry Road, Radford VA 24143-0100
www.baesystems.com
-----Original Message-----
From: Christopher Wright chrisw@skypoint.com
Sent: Friday, July 23, 2021 2:29 PM
To: XANSYS Mailing List Home xansys-temp@list.xansys.org
Subject: [Xansys] Re: [Mechanical] 2-D analysis with axial force
External Email Alert
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On Jul 23, 2021, at 10:13 AM, Caba, Aaron (US) via Xansys xansys-temp@list.xansys.org wrote:
I see the 2-D plane strain and plane stress analysis types, but they do not take account the axial forces. Is there a 2-D analysis type that can include axial forces? I also see the generalized plane strain, but that looks like it only takes into account rotations on the ends.
Um…if you include the axial loading it'd be three-dimensional as far as ANSYS is concerned, but it sounds like it's actually 2D with a statically determinate constant out-of-plane load like the longitudinal stress in a cylindrical pressure vessel. Seems to me that the axial stresses don't affect anything in the 'hoop' direction—they don't for things like pipes and cylindrical pressure vessels. Maybe you can add in the axial load in with a post-processing macro.
Christopher Wright P.E. (ret'd) |"They couldn't hit an elephant at
chrisw@skypoint.com | this distance" (last words of Gen.
| John Sedgwick, Spotsylvania (1864) http://www.skypoint.com/members/chrisw/
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On Jul 23, 2021, at 2:47 PM, Caba, Aaron (US) via Xansys xansys-temp@list.xansys.org wrote:
Chris,
Um…if you include the axial loading it'd be three-dimensional as far as ANSYS is concerned
That's the conclusion I came to. I was just wondering if there was a whiz-bang APDL command that would apply the axial load to a 2-D model -- guess not.
No way to apply a load where you have no degree of freedom
I ended up with a 2 element thick slice to deal with the 3-D loading and inner bore geometry. It lets me mesh with bricks, and it runs super fast, just not quite as fast as a 2-D model.
Seems to me that the axial stresses don't affect anything in the 'hoop'
direction—they don't for things like pipes and cylindrical pressure vessels.
Very interesting! I re-ran the model in both a plane-stress state and with an axial load. The axial load case increases the max deflection and stress results by about 0.7%. So not really enough to worry about, given the uncertainty in my material properties.
I bet it has something to do with the poisson effect. Good trick to know.
Aaron C. Caba, Ph.D.
Sr. Principal R&D Engineer
BAE Systems, Inc.
4050 Peppers Ferry Road, Radford VA 24143-0100
www.baesystems.com
-----Original Message-----
From: Christopher Wright chrisw@skypoint.com
Sent: Friday, July 23, 2021 2:29 PM
To: XANSYS Mailing List Home xansys-temp@list.xansys.org
Subject: [Xansys] Re: [Mechanical] 2-D analysis with axial force
External Email Alert
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On Jul 23, 2021, at 10:13 AM, Caba, Aaron (US) via Xansys xansys-temp@list.xansys.org wrote:
I see the 2-D plane strain and plane stress analysis types, but they do not take account the axial forces. Is there a 2-D analysis type that can include axial forces? I also see the generalized plane strain, but that looks like it only takes into account rotations on the ends.
Um…if you include the axial loading it'd be three-dimensional as far as ANSYS is concerned, but it sounds like it's actually 2D with a statically determinate constant out-of-plane load like the longitudinal stress in a cylindrical pressure vessel. Seems to me that the axial stresses don't affect anything in the 'hoop' direction—they don't for things like pipes and cylindrical pressure vessels. Maybe you can add in the axial load in with a post-processing macro.
Christopher Wright P.E. (ret'd) |"They couldn't hit an elephant at
chrisw@skypoint.com | this distance" (last words of Gen.
| John Sedgwick, Spotsylvania (1864) http://www.skypoint.com/members/chrisw/
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Christopher Wright
chrisw@skypoint.com
——
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God save Donald Duck, vaudeville and variety.
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