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Non-linear Buckling in Ansys

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Hello to all,

                 I m mahendra and i want few suggesions for my final year project Regarding Non-Linear buckling of composite Wind Turbine. I have done Linear Buckling and got a BLF=1.3 which is fine as per GL Guidlines. I m using Ansys12 Edu ver. and Shell 281 Element type with section properties. For load application i m using pilot node at 9 airfoils on the full blade.

Then i have applies Mx and My on that load application points.

In Non-Linear Analysis i m not getting the convergence as i m applying load on one node or at all the 9 points.

Jayadeep U. B.'s picture

Principle of minimum potential energy -- why is it true?

Dear all,

Two fundamental concepts from thermodynamics are that systems try to minimise their potential energy, whereas the tendency is to maximise the entropy (ofcourse I am not at all precise in the above statement, but I hope I am able to convey the matter.  Further, the two can be combined in the form of a free enrgy as applicable to the system under consideration).

mohamedmoussa's picture

European computational mechanics degrees

I'm looking for a good quality master's degree in computational mechanics. I currently live in Australia, and would prefer to study in Europe (must be an English based program as well). I have undergradaute degrees in mechanical engineering and computer science.

Two main degrees that stick out for me are the ones at the University of Stuttgart, and the Technical University of Munich.

need some standard tiles quickly

Hi everyone,

 some one please help me! I need some standards names and title for a course project.

I am searching for standards for testing pressure drop in pipes, valves, sight glasses and other hydrulic components. also i need standards for testing pumps too(specially diapheragm pumps) . i used google, but i didnt find anything useful, please help me. 

Tensile testing curve and fracture toughness relation

Hello everyone,
I am studying fracture of polymer composites.
I had a question I want to relate fracture toughness of composite to the composite stress-strain curve found from simple tensin test(on samples with no notch or pre-existing crack), can anyone give me a hint , how to do it?

Faculty Positions: Mechanical Engineering at KAUST (King Abdullah University of Science and Technology)

FACULTY POSITIONS: MECHANICAL ENGINEERING
The Mechanical Engineering Program in the Physical Sciences and Engineering Division at King Abdullah University of Science and Technology (KAUST) invites applications for faculty positions at all ranks (Assistant, Associate, and Full Professors).

prestressed concrete

Dear Abaqus user

I am modeling a post-tensioned concrete pier with 4 part:

-concrete foundation,pier,cap(C3D8R) and tendon(wire,B31)

 I input prestress force by predefined file,stress in initial step.The first step is static,General to find equilibrium.

 I embeded the beginning & the end of wire in foundation & cap. contact between (foundation,pier) & (pier,cap) is hard normal contact and the tangential behavior is penalty.

"THERMO Spoken Here!" - Basic Engineering Thermo OnLine

Basic Engineering Thermodynamics content is online:

http://www.thermospokenhere.com

Over 200 sequential examples and topics.  The material includes essential

prerequisite physics and calculus.  Coverage of Engineering Thermo amounts to

about 30% of the typical, current ME Department offering.  Less is More!

Soft Solids

I thought that your readership might be interested in a textbook that I recently published entitled "Soft Solids: A primer the the mechanics of materials." It is geared for the senior-masters level student.

http://www.amazon.com/Soft-Solids-Theorical-Mechanics-Materials/dp/1480257095

mohammedlamine's picture

Inverse

It is not recommended to Invert a Matrix in Numerical Analysis. Solving with Factorization methods (L.U, L.D.Lt, ..) is better than Solution with Direct Inverse. This is due to Numerical Errors (roundoff) and/or ill-Conditioned problems. In case of you need to use an Inverse, you are advised to take care about using existing algorithms which can't be exact in all applications.

New Text on Engineering Mechanics (Strength of Materials)

 

After many years of teaching elementary mechanics and being unhappy with the high price of existing texts and their tendency to lead students into a game of pattern matching as opposed to thinking about fundamentals, I decided to assemble my lectures into a book.  So if you are looking for something different and concise on this topic you may wish to have a look at this book.  The book is also well suited for use as a refresher due to its brevity.

http://ukcatalogue.oup.com/product/9780199651641.do

tutorials:

Where do i get tutorials with step by step procedure on abaqus. I need to solve a beam problem using composite layups with 3D elements

piezocomposite post buckling open cicuit Analysis

Hello!

I am
working on my master project, regarding post buckling of laminates with
piezoelectric layers.

I
have studied piezoelectric theory and related document about post-buckling of
piezoelectric laminates.

-         
Is it possible to uncoupled analysis
of buckling and post buckling of piezoelectric laminates with electrical load (and
no mechanical load)?

Non-linear analysis of Flat rectangular laminated plates

Hi,

I am working on my post grads project, i would be very thankful if anyone does needful in this regard.

I need some suggestions in deriving out the non-linear governing  equation for a simply supported flat rectangular laminated plate , here i considered a uniformly distributed load. 
I have taken Von-Karman strains e(xx), e(yy), e(xy) with non-linear terms for a single term,

to derive the equilibrium equations of motion, is virtual principles of work or displacement necessary? 

I am using classical plate theory for the analysis.

composite with taper plies

Hi,

I am Sri Harsha from IITMadras.

I have been trying to do composite with 40 plies out of which 20 taper plies in 1 in 20 ramp.

It is giving error which I am sending in the attachment..

If
I am trying to work with 20 normal plies with no taper plies in it and only 20 taper plies separately
it is working but when I do combine these two it is giving error. I do not
know what was wrong in it. Can anyone please help me out in this. I have
to do this as soon as possible.

rohan_patel8388's picture

Meaning of Weak form use in Finite element Method

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Hallo,

 

 I am a Computational Mechanics Student. I always come across during class of Finite Element Methods. I want to know what does actual mean by "Weak Form"? IAnd What are we take Test Function while using in Galerkin Method?

 

 

Finite Element Analysis

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Hello....

I have one Finite Element Analysis Question.

For static analysis inertia and damping forces are negligible. To what extent must the load vary with respect to time, so as to consider Dynamic analysis instead of static analysis for a given FEA problem.

Ikechukwu Onyegiri's picture

Inherent Safety Guidewords

Taxonomy upgrade extras: 

First article of new Open Access Journal Case Studies in Engineering Failure Analysis available on ScienceDirect

Case Studies in Engineering Failure Analysis is now officially launched with its first papers now awailable  on Science Direct: Cracking of underground welded steel pipes caused by HAZ sensitization

An opportunity for postdoctoral scholars

Postdoc Free Access Program
For scholars who recently received their PhD’s and currently do not have a research position, we are pleased to offer unlimited complimentary access to all our journals and books on ScienceDirect, for up to 6 months. http://www.elsevier.com/wps/find/authorsview.authors/postdocfreeaccess

Mechanical behavior of materials

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Hello, pls i need ur assistance on how to solve these problems

1) calculate young's modulus for an iron crystal when tension is applied along a <122> direction. 

2) consider a thin-wall tube that is 1 inch in diameter and has a 0.010-inch wall thickness. let x, y and z be the axial, tangential(hoop), and radial directions, respectively.

(a) the tube is subjected to an axial tensile force of 80 lbs. and turque of 100in-lbs what is the magnitude of the largest principal stress?

Mechanical behavior of materials

Choose a channel featured in the header of iMechanica: 

Hello, pls i need ur assistance on how to solve these problems

1) calculate young's modulus for an iron crystal when tension is applied along a <122> direction. 

2) consider a thin-wall tube that is 1 inch in diameter and has a 0.010-inch wall thickness. let x, y and z be the axial, tangential(hoop), and radial directions, respectively.

(a) the tube is subjected to an axial tensile force of 80 lbs. and turque of 100in-lbs what is the magnitude of the largest principal stress?

CISM, Udine course on Isogeometric Analysis

Dear all,

To register for the CISM course on isogeometric analysis described here: http://www.cism.it/courses/C1301/ please go to: http://www.cism.it/accounts/login/?next=/courses/C1301/apply/

It would help if you applied early, to make sure there are places remaining. Talk to me if questions arise.

stephane  dot bordas at gmail dot com

bordasS at cardiff.ac dot uk

Cheers,

Stéf

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