XANSYS Message: 95457 [Go back to message list]
No rating yet
Subject: [PC] Windows XP SP3
Author: Frank Exius
Date: 2008-10-15 16:26:19Hello everybody,
anyone installed SP3 yet, any complaints esp.
ANSYS stability problems, or other. Like, has
ANSYS Inc. approved SP3 officially ?
Thanks for any notice.
Gruesse,
Frank Exius
IFE Deutschland
www.ife-ansys.de
Telefon +49-2642-980409
Geschaeftszeiten Mo-Fr 09-18:00 Uhr
-----Original Message-----
From: xansys-bounces_at_xansys.org [mailto:xansys-bounces_at_xansys.org] On Behalf Of Andre Beim
Sent: Monday, October 13, 2008 4:36 PM
To: 'ANSYS User Discussion List'
Subject: [Xansys] RES: [Struc] crack propagation in fatigue
Robin,
I know and use BS 7910 for a long time; it is exactly the criteria I am
comparing with. The point is that this norm does not say anything about the
effect of the size of the flaw in the crak propagation rate, or what is the
minimum size the propagation law is valid. It does say about slag inclusions
at weld toes, with heights of 0.15 to 0.4 mm, in the paragraph about S-N
curves.
Andre Beim
Tresca Eng., Brasil
e-mail: andre_at_tresca.com.br
-----Mensagem original-----
De: xansys-bounces_at_xansys.org [mailto:xansys-bounces_at_xansys.org] Em nome de
Robin Borland
Enviada em: domingo, 12 de outubro de 2008 16:17
Para: xansys_at_xansys.org
Assunto: Re: [Xansys] [Struc] crack propagation in fatigue
Andre,
You might want to look at BS7910 for a detailed procedure on how to assess
cracks in welds, TWI has software available for assessment. There are a lot
of factors to consider such as estimation of secondary stresses, whether
there is post weld heat treatment etc. see
http://www.twisoftware.com/crackwise
Regards
Robin Borland
Integra Developments LLC
Andre,
I didn't know this is about weld, which should make it different. I use SN
curve in BS7608 to address weld fatigue. What part of ASME code are you
using for fatigue analysis?
For welds, there needs a specification on flaw size for inspection. And I
believe the understanding of the crack growth rate of different size do help
for the specification and for defining inspection period.
Guowei Li
Engineering Analyst | Westport Innovations Inc.
604-718-2048 | gli_at_westport.com
-----Original Message-----
From: xansys-bounces_at_xansys.org [mailto:xansys-bounces_at_xansys.org] On Behalf
Of Andre Beim
Sent: October 10, 2008 8:23 AM
To: 'ANSYS User Discussion List'
Subject: Re: [Xansys] [Struc] crack propagation in fatigue
Guowei Li,
I agree with you, but there are specifications with this requirement for new
welds, for which I want to find a way to rule out.
Andre Beim
Tresca Eng., Brasil
e-mail: andre_at_tresca.com.br
-----Mensagem original-----
De: xansys-bounces_at_xansys.org [mailto:xansys-bounces_at_xansys.org] Em nome de
Guowei Li Enviada em: quinta-feira, 9 de outubro de 2008 19:50
Para: ANSYS User Discussion List
Assunto: {SPAM} Re: [Xansys] [Struc] crack propagation in fatigue
I would think these are two related but distinct issues.
Fatigue is where a part is experiencing crack initiation and crack
propagation. The life is the summation of the crack initiation and the crack
propagation, which is what ASME tells. Crack propagation (Paris) account for
the latter part.
Crack propagation analysis can provide a quantitative risk assessment of a
flaw size on a component and prediction of the next inspection time.
Hope this can explain.
Cheers,
Guowei Li
Engineering Analyst | Westport Innovations Inc.
604-718-2048 | gli_at_westport.com
-----Original Message-----
From: xansys-bounces_at_xansys.org [mailto:xansys-bounces_at_xansys.org] On Behalf
Of Andre Beim
Sent: October 9, 2008 11:31 AM
To: 'ANSYS User Discussion List'
Subject: [Xansys] [Struc] crack propagation in fatigue
I want to bring a new issue to an old topic. Some time ago, some people
told about a trend in fatigue analysis, to consider a small initial deffect
in the material (some say is 0.25 mm, others say 0.3, others say even
0.5
mm), and calculate the life with the fatigue propagation laws (Paris law). I
had recently a case in which a part was safe according to the ASME fatigue
curve (which is known to be very conservative), but unsafe when calculated
by this small crack propagation criteria. A metallurgist told me the reason
is that the propagation curves are determined with test specimens with large
cracks, and the propagation of a small crack is a completely different
phenomenon, which depends on the material (he said he had some experimental
curves). I did not find anything about this in the codes. BTW, the part I
designed did not fail. Does anybody know any code or published data showing
this difference?
Andre Beim
Tresca Eng., Brasil
e-mail: andre_at_tresca.com.br
-----Original Message-----
From: xansys-bounces_at_xansys.org [mailto:xansys-bounces_at_xansys.org] On Behalf
Of xansys-request_at_xansys.org
Sent: Saturday, October 11, 2008 3:00 PM
To: xansys_at_xansys.org
Subject: Xansys Digest, Vol 69, Issue 10
Send Xansys mailing list submissions to
xansys_at_xansys.org
To subscribe or unsubscribe via the World Wide Web, visit
http://xansys.org/mailman/listinfo/xansys
or, via email, send a message with subject or body 'help' to
xansys-request_at_xansys.org
You can reach the person managing the list at
xansys-owner_at_xansys.org
When replying, please edit your Subject line so it is more specific than
"Re: Contents of Xansys digest..."
No virus found in this incoming message.
Checked by AVG - http://www.avg.com
Version: 8.0.173 / Virus Database: 270.8.0/1719 - Release Date: 10/10/2008
4:08 PM
No virus found in this outgoing message.
Checked by AVG - http://www.avg.com
Version: 8.0.173 / Virus Database: 270.8.0/1719 - Release Date: 10/10/2008
4:08 PM
^----------------------------------------------------
| XANSYS web - www.xansys.org |
| XANSYS blog - xansys.blogspot.com |
| The Online Community for users |
| of ANSYS, Inc. Software |
| Hosted by PADT - www.padtinc.com |
^----------------------------------------------------
^----------------------------------------------------
| XANSYS web - www.xansys.org |
| XANSYS blog - xansys.blogspot.com |
| The Online Community for users |
| of ANSYS, Inc. Software |
| Hosted by PADT - www.padtinc.com |
^----------------------------------------------------