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Abolhasan Giashi's picture

Rubber Adhesion Behaviour

Dear everyone

My project is about the adhesional friction between rubber and a rigid surface. In this case I have modeled a block of rubber which is sliding on a real rough rigid surface in ABAQUS.

Abolhasan Giashi's picture

Rubber Adhesion Behaviour

Choose a channel featured in the header of iMechanica: 

Dear everyone

 

My project is about the adhesional friction between rubber and a rigid surface. In this case I have modeled a block of rubber which is sliding on a real rough rigid surface in ABAQUS.

 

matlab code to create cohesive elements (or UMAT) in any 2D mesh

To use cohesive elements, normally user can add a layer of elements between neighbouring node pairs. This matlab code can help you to process that especially your FE mesh is irregular. The code, the initial .inp file and corresponding out put files are attached for a better illustration. The new generated cohesive elements won't cause any trouble in the element number. Also you can apply this code to generate new UMAT elements in mesh.

 

XFEM in LS-DYNA

Hello,

Can anyone help me with some examples of XFEM implementation in LS-DYNA? Also, is XFEM in LS-DYNA currently applicable with shell elements only?

Thank you,

Prathyush

Converged, but to the right solution??

Hello eveybody,

I am confused in using numerical schemes: What can convergence of a numerical scheme tell us and what not??? lets assume that a numerical scheme does converge to "A result" or "A number", but how could we be sure that the scheme has actually converged to the "RIGHT solution" and not a WRONG one??

Any input is appreciated!

Setareh

GASCO (ADNOC) Funded Multiple Postdoctoral Positions at Masdar Institute in collaboration with MIT, TAMU and PI

Project Title: Design and Development of High Performance Composites for Hydrocarbon and Water Transmission & Distribution Systems: An Integrated Approach

Advanced Materials and Multi-functional Structures (AMMS) group at Masdar Institute invites applications for Project-Postdoctoral Positions to work on a multi-disciplinary collaborative project funded by GASCO (ADNOC), Abu Dhabi. Principal Investigators of the project are: 

• Prof. Kumar Shanmugam, Principal Investigator, Masdar Institute (MI) 

Material Orientation UMAT

Choose a channel featured in the header of iMechanica: 

Hi,

 

I have a bicrystal with 2 material orientations in Euler Angles. How do I assign them to my Abaqus Input file? I am using Dr Huang's code for CP. After going through several forums, I understood that I have to create a card with *ORIENTATION entry.

This is what I am trying to do:

http://imechanica.org/node/2909

Its not quite clear to me. Could anyone please please simplify and explain how I could do the same? Thanks a lot!

Green–Lagrange strain for Shell: transformation from curvilinear coordinate to local Cartesian coordinate

Hello all:

      I am confused about how to transform Green–Lagrange strain defined using  curvilinear coordinate to local Cartesian coordinate.  

initial particle distribution in SPH

I wonder how important the initial set up for a Smoothed Particle Hydrodynamics simulation is. Is the initial particle distribution somehow significant for the final result? How to control particle density and distribution along problem domain? What are the important factors inherent to the initial set up? Having control over the initial set up is going against the philosophy of this method?

 

J integral estimation in ABAQUS

Dear all,

I am a Ph.D student. I am trying to calculate the value of the j-integral for a 3D penny shaped crack embeddee in a continuum linear elastic solid using ABAQUS.

the first difficulty that I have met is that j-integral values are negative forr some nodes along the crack front.

I am pretty sure that the value of the normal to the crack front that I have used is correct.

 Do you know some other reason for that?

Mechanical Engineering Technology: Clean Energy And Linear Motion Mechanism

You can see two sliders. I apply force using one slider to another slider. Best part is one slider move little bit

and helps second slider

to slide 6 times length at 70 % force.

For More information please visit http://mechanicalresearch.info/

 

ESIS's picture

Discussion of fracture paper #9

Dear Reader, 

I recently took over as the ESIS blog editor. Being the second in this baton relay, I will do my best to live up to the good reader expectations that has been established by my precursor, who is also one of the instigators of the blog, Wolfgang Brock. 

Vectorial rapresentaton of State Variable in ABAQUS

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Hello,

 

I qould like to represent a State Variable of my Abaqus UMAT with a vector field. Is it possible to do that? How do I proceed?

Thank you in advance!

Regars,

Mattia, UCSB

USDFLD subroutine

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Hi all,

I am new to ABAQUS. I need to write a subroutine for thermal gradient in USDFLD. But I am not able to do that. Can anyone help me to do that.

 

Thanks in advance

Prashant Saxena's picture

Theoretical study of magneto-rheological elastomers

I post the links to some of our recently published papers on magneto-elasticity. These are iron-filled elastomers whose mechanical properties can be influenced by the application of a magnetic field. A continuum theory that accounts for magneto-mechanical coupling as well as rate-dependent energy dissipating deformations is presented.

I also attach post-print versions of these articles here. Hopefully, they can be useful for some people working in this field.

Jeong-Yun Sun's picture

Ionic Skin

Research paper.

Title:  Ionic Skin

 

Authors: J.-Y. Sun, C. Keplinger, G.M. Whitesides, Z. Suo

 

Case Studies in Engineering: watch the video

Whatch our video http://www.youtube.com/watch?v=6FpxQrvpU4g

What are case studies?

Case Studies in Engineering are a series of open access journals, which publish practical outcome of research and indusrty projects in a variety of Engineering disciplines, including: Construction Materials, Fire Safety, Structural Engineering, Engineering Failure Analysis, Mechanical Systems and Signal Processing, Nondestructive Testing Evaluation and Thermal Engineering.

Payam Soltani's picture

Piezoelectric vibration damping using resonant shunt circuits: an exact solution

Piezoelectric vibration damping using resonant shunt circuits: an exact solution

By:

Payam Soltani, Gaetan  Kerschen, Gilles  Tondreau and Arnaud Deraemaeker

Abstract

determination of stiffness matrix of transversely isotropic material

Dear all, I am an applied mathematician and I  have been stucked by the this general question for a while, i.e.,  to determine the stiffness matrix of transversely isotropic material from known strain and stress tensors.  The definition of transversely isotropic tells us that the stiffness matrix can be defined by 5 constants, see attached figure. C44 is easy to determine, so we can focus on the remaining 4 constants. I attempted to establish 4 linear equations for these 4 constants with the known strain and stress components.

Lihua Jin's picture

Ridge localizations and networks in thin films compressed by incremental release of large equi-biaxial substrate pre-stretch

Atsushi Takei, Lihua Jin, John W Hutchinson, Hiroyuki Fujita, Ridge localizations and networks in thin films compressed by incremental release of large equi-biaxial substrate pre-stretch, Advanced Materials, 2014, 26 (24): 4061-4067.

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