Shell element

[abdullah]

Hii every one.

I want to draw a pipe with outer diameter of 150mm and inner diameter of 140 using excursion shell option. In the sketch I draw a circle with 150mm diameter. So, when I assign the section of 5 mm think what option should I choose bottom or middle or upper surface? So that the pipe will be as required?

Abdullah
Best regards

[s***@wipro.com]

Has to be upper...but be careful of normal....My advice is make the
circle as 145mm dia and use middle. That is the most accurate one...

Regards,
V.Sridharan


From: ***@yahoogroups.com [mailto:***@yahoogroups.com] On Behalf
Of abdullah
Sent: Monday, July 04, 2011 11:16 AM
To: ***@yahoogroups.com
Subject: [Abaqus] Shell element

Hi everyone.

I want to draw a pipe with outer diameter of 150mm and inner diameter of 140 using excursion shell option. In the sketch I draw a circle with 150mm diameter. So, when I assign the section of 5 mm think what option should I choose bottom or middle or upper surface? So that the pipe will be as required?

Abdullah
Best regards

[jagan prabhu]

For further clarifications,  I doubt may be my questions are too basic, please could you explain,

1, what happens if outer surface modeled and assign normals pointing towards inside of pipe ?
2, If mid-surface is modeled, in which direction normals should be set ? & why?

Regards,

--- On Thu, 7/7/11, ***@wipro.com <***@wipro.com> wrote:

From: ***@wipro.com <***@wipro.com>
Subject: RE: [Abaqus] Shell element
To: ***@yahoogroups.com
Date: Thursday, 7 July, 2011, 12:13 AM

Has to be upper...but be careful of normal....My advice is make the

circle as 145mm dia and use middle. That is the most accurate one...



Regards,

V.Sridharan



From: ***@yahoogroups.com [mailto:***@yahoogroups.com] On Behalf

Of abdullah

Sent: Monday, July 04, 2011 11:16 AM

To: ***@yahoogroups.com

Subject: [Abaqus] Shell element



Hi everyone.



I want to draw a pipe with outer diameter of 150mm and inner diameter of 140 using excursion shell option. In the sketch I draw a circle with 150mm diameter. So, when I assign the section of 5 mm think what option should I choose bottom or middle or upper surface? So that the pipe will be as required?



Abdullah

Best regards

[Dave Lindeman]

If the location of the nodes (inner diameter vs. outer diameter),
surface normal, and surface assignment (bottom vs. top) aren't
consistent, then your pipe will be larger or smaller than you intend.
If you model the mid-surface, then the normal doesn't matter (unless
you're doing contact).

Regards,
Dave

Dave Lindeman
Lead Research Specialist
3M Company
3M Center 235-3F-08
St. Paul, MN 55144
651-733-6383

For further clarifications, I doubt may be my questions are too basic,
please could you explain,
1, what happens if outer surface modeled and assign normals pointing
towards inside of pipe ?
2, If mid-surface is modeled, in which direction normals should be set ? & why?
Regards,
<mailto:sridharan.venkataramanan%40wipro.com>
<mailto:sridharan.venkataramanan%40wipro.com>
<mailto:sridharan.venkataramanan%40wipro.com>>
Subject: RE: [Abaqus] Shell element
Date: Thursday, 7 July, 2011, 12:13 AM
Has to be upper...but be careful of normal....My advice is make the
circle as 145mm dia and use middle. That is the most accurate one...
Regards,
V.Sridharan
Of abdullah
Sent: Monday, July 04, 2011 11:16 AM
Subject: [Abaqus] Shell element
Hi everyone.
I want to draw a pipe with outer diameter of 150mm and inner diameter of
140 using excursion shell option. In the sketch I draw a circle with
150mm diameter. So, when I assign the section of 5 mm think what option
should I choose bottom or middle or upper surface? So that the pipe will
be as required?
Abdullah
Best regards