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1st, 2nd & 3rd principal strain vs. minimum and maximum principal strains

Submitted by bancanus on
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Hi All,

Non-maths person here struggling with the relationship between 1st, 2nd and 3rd principal strains generated by FEA software and minimum and maximum prinicipal strains often cited in the literature.

As i understand it the 1st principal strain is the most positive strain, 2nd and then 3rd most positive strains. For instance:

Case 1-

1st principal strain = +1000

2nd principal strain = +100

3rd principal strain = +50

Case 2-

1st principal strain = +500

2nd principal strain = -50

Fractal surface mesh generation

Submitted by Biswajit Banerjee on

Saber El Arem (node/14053 ) wanted to know how a fractal surface mesh could be created.

I've had to do that in the past.  What I did was to use Arjun Viswanathan's 1999 Matlab snippet on creating a plasma fractal and write a wrapper around it to create an output file that could be read by the then available version of Abaqus.

I've attached a couple of Matlab files that should be able to do the job.   The .txt extensions are needed because iMechanica does not accept files with .m extensions.

Irfan: Abaqus

Submitted by memimp on

I am doing spur gear contact simulation on abaqus when I do this driver gear rotate but driven gear not rotate as I observed in results.

So is there mistake in interaction module or constraint or boundary conditions?

I also followed instructions which were given to member " zeke2282".

 

 

Non-linear Buckling in Ansys

Submitted by xyront on
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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.



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

Submitted by Jayadeep U. B. on

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).

European computational mechanics degrees

Submitted by mohamedmoussa on

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

Submitted by adeldarbandi on

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

Submitted by jjamali on

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)

Submitted by JobElephant on

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

Submitted by javidi on

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.