Hi friends

I've a question about ALGOR PipePak...how does ALGOR(PipePak) calculate the stiffness matrix of a pipe element...I guess it's available on its user's guide,,,but unfortunately I don't access that...can anybody guide me on this issue ?

Regards

Laleh Fatahi
http://laleh.fatahi.googlepages.com

Hi
I've a question about the Subspace method as one of the mode extraction methods of ANSYS.I want to extract the first 100 modes of a system with more than 200 DOFs, 
I assigned "No. mode to extract" to 100.
but when I ran the analysis, ANSYS just calculated the first 75 modes of the system...
I checked out the Subspace options again and I saw "No. mode to extract" was assigned to 75!!!!, I don't know why this option has changed??!

any help is appreciated
Regards

Laleh
http://laleh.fatahi.googlepages.com

Hi

I want to model a composite laminate by shell99 in ANSYS.This laminate is symmetrical about the midplane,so I adjust Layer Symmetry Key(LSYM) to 1 and halve the number of layers. when I compare the maximum deflection of this model with the max deflection of the model with LSYM=0(by inputing total layers) there is a big difference between these two results. It's natural that the results should be the same. I don't know why this error occurs.

Laleh
http://laleh.fatahi.googlepages.com

Hi

I want to model a composite laminate by ANSYS.This laminate is symmetrical about the midplane,so I adjust Layer Symmetry Key(LSYM) to 1 and halve the number of layers. when I compare the maximum deflection of this model with the max deflection of the model with LSYM=0(by inputing total layers) there is a big difference between these two results. It's natural that the results should be the same. I don't know why this error occurs.

Laleh
http://laleh.fatahi.googlepages.com

Hi friends
I want to use ANSYS to find the maximum deflection of a laminate composite plate that is made of graphite epoxy .It has 100 mm width and 500 mm length.
The layup is [45(10),0(10)]  (20 Layers).
The plate is simply supported along all 4 edges and is subjected to a uniformly distributed transverse direction load p=10,000 N/m2.

The material properties of the layers are as below: 

Hi
I have read some descriptions about beam element in chapter 14 of Element Library of ANSYS Theory Reference(ANSYS Help),it is mentioned that the stiffness matrix of a beam element in element coordinates is a 12x12 matrix that its elements are calculated in the same way as przemieniecki's book(Przemieniecki, J. S., Theory of Matrix Structural Analysis, McGraw-Hill, New York (1968))
Unfortunately I didn't find this book in the library,if any body has read this book,if it is possible guide me how przemieniecki have reached to such stiffness matrix?

Sincerely yours

Laleh Fatahi
http://laleh.fatahi.googlepages.com  

Hi
Unfortunately my sciencedirect account doesn't support articles have published before 1995,
"Vibrations of a hanging Timoshenko beam under gravity
Journal of Sound and Vibration, Volume 141, Issue 2, 8 September 1990, Pages 245-258
T. Yokoyama"
can any body (who access to 1990's articles of sciencedirect(journal of sound and vibration)) send this article to me,if it is possible for s/he?

Kind Regards

Laleh Fatahi
http://laleh.fatahi.googlepages.com

Hi
I need urgent for an artice in the  journal of applied mechanics,ASME(an old issue--> December 1959).My requested article is "Piping Flexibility Analysis"  by L.H. Chen
Is there any one has this issue?

Sincerely yours

Laleh Fatahi
http://laleh.fatahi.googlepages.com

Hi

I am a beginner in working with Abaqus(v 6.3),I want to model a simple piping system,I use pipe and elbow elements,in section assignment, I select a beam section for the part .But When I run the job,an error occurs due to element properties in section assignment,when I use beam element instead of pipe there is not such an error in job-run.
but I want to use pipe and elbow elements...what can I do to solve this problem?

any help is appreciated
Laleh Fatahi

http://laleh.fatahi.googlepages.com