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Co-rotational formulation for trusses

Submitted by bruno-page on
Forums
Computational Mechanics Forum

Hi, I have been reading a chapter on Co-rotational Formulation for trusses in Non-Linear Finite Element Analysis. And, I am here with a question which a very basic question concerning linear analysis. 

Now, a co-rotational formulation for trusses (say) separates the rigid motion from the motion of the truss and what remains is strain causing the deformation of the truss element. My basic question is, that, while doing linear analysis, is it that, the displacements which we obtain in case of trusses or even beams include rigid body motion as well? 

Remeshing in Abaqus/ Explicit

Submitted by tahsinopoz on
software

Hi Dear IMechanica User

I have faced up a problem during micro-scale cutting using abrasives. I am trying to model this process using Abaqus/explicit and with remeshing module. but currently there doesnt exist any remeshing technique in abaqus/explicit. Could you please suggest the way for doing this simulation by using remeshing technique in Abaqus/explicit. Abaqus/standard is not helpfull to model cutting simulation. this is because i am using Abaqus/explicit by the way.

 

I am awaiting your valuable suggestions and helpfull informations.

International Journal of Applied Mechanics (IJAM) Vol.2 No.1

Submitted by zishun liu on
research
applied mechanics

Forthcoming papers of International Journal of Applied Mechanics (IJAM) Vol.2 No.1:  

1．“An Alternative Explanation of The Effect of Humidity In Gecko Adhesion: Stiffness Reduction Enhances Adhesion on A Rough Surface”, Bin Chen (McMaster University, Canada) and Huajian Gao (Brown University, USA). 

strain field measurement

Submitted by schuffe on
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strain field measurement

HI,

i am looking into strain field measurement for coupon tension tests for
the purpose of correlation to fea results . a collegue told me that
there is an open source project

which calculates strain field from camera images. does anybody know something about it?

Cheers,

schuffe

Question on non-linear iteration in cases of force-controlled loading and displacement-controlled loading

Submitted by Liu Jinxing on
research

In all textbooks, when iteration methods are introduced, the iterative formula is always H(x)x+f=0, where f is the external force applied on the system. All methods are stated when f is fixed.

Question on the definitions of secant stiffness and tangent stiffness in iterative methods for non-linear problems

Submitted by Liu Jinxing on
research
computational mechanics

Recently, I find that definitions of secant stiffness and tangent stiffness in many books seem pretty confused.Therefore, here I am giving the definitions I think correct, then give my questions on them.

Consider the equation

H(x)x+f=0

(1) Definition of tangent stiffness. As for the above equation, what is the tangent stiffness for some particular value x0?

Let's give the definition according basic knowledge of advanced mathematics. Let's consider the curve H(x)x~x. For this curve, y=H(x)x, so the tangent at x0 is

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