Do you know how to predict the mechanical properties of wire after being drawn with several dies ? especially with Duplex stailess steel material.

A postdoc position in multiscale stochastic computation will be available in Fall 2008. Experience on finite elements, multiscale methods, high performance/parallel computing, or computational fracture/damage modeling is desired. Please contact:      

X. Frank Xu, xxu1@stevens.edu
http://personal.stevens.edu/~xxu1

A Cosserat Point Element (CPE) for finite deformation elastic-viscoplastic materials

Background: Recently the theory of a Cosserat Point has been used to develop an eight noded 3-D brick Cosserat Point Element (CPE) for finite deformation elasticity.  In contrast with standard finite element procedures, the CPE approach treats the element as a structure and proposes a strain energy function that ensures positive stiffness to all inhomogeneous modes of deformation.  This leads to a CPE that does not experience hourglass instabilities exhibited by elements in commercial codes.

I intend to do some tensile testing on some composite materials with very small thickness (about 0.5-1mm) and size 3 cm x 1 cm in a temperature ramp mode. I would like to know the name of such a testing machine or contact if any one has the same?

An engineer position is available for PhD graduates from the areas of solid mechanics at the Houston area. Abilities of design, experimentation, and good communication skill are required. Please contact zyong1510@yahoo.com if interested.

We have an opening for a post doctoral associate to work on biomimetic fibrillar interfaces.  We are seeking a person with skills and interests in mechanical testing and microfabrication, and background in contact and fracture mechanics.  The work will be in the group of Anand Jagota at Lehigh University in collaboration with the group of Herbert Hui at Cornell University.   Please contact either Anand Jagota (anj6@lehigh.edu) or Herbert Hui (ch45@cornell.edu) if you are interested.

Hi Every one,

It is immense pleasure to meet all you in this technical forum.

I have a basic query in strength of materials

This is about of short beam

Beam dimensions are
L=7.375 mm
Dia =15.05 mm
Tip Force=27514 N

Hi.

This is a simple question about defining material properties of a plastic I guess.

I have a value for tensile & compression strength and have to include this in my model, alongside the modulus & poisson ratio. I use *Elastic for modulus & poisson, but I don't know which card to use for tensile & compression.

Have already checked the manual, but the search 'tensile compression strength' leads me to the Hashin criteria page, which is not suitable for my material.

Can anyone help?

Thanks in advance,
jo

Is it possible to produce a small scale prototype to support the experimental work? If  it is made a small scale sample,is it possible to simulate the required impact force or crash force to real size condition? what is the desired equation in simulating the impact condition?

An intensive metal plasticity/viscoplasticity literature review is needed, with drawbacks and capabilities of different models. Any found previous work?

I'm working on modeling of mechanical properties of polymer based nanocomposites with clay.I have prepared a code for distributing plat like particles in polimar matrix (preparing RVE) with ABAQUS. I saw DIGIMAT software by www.e-xstream.com Company in internet some times ago. Now I want to test accuracy and application of this software one my project. I want to know if anyone in this club has had worked with this software and so if any one can provide me with a link of academic version of this software for a while.

There is a potential opening for a graduate student research assistantship in Department of Mechanical Engineering, at The University of British Columbia, Vancouver, Canada. Interested students with strong academic background with interest in theory and experiments in the areas of dynamics and vibrations, applied (solid) mechanics are encouraged to apply. Initial queries to be addressed to Srikanth (spa21@bath.ac.uk).

We are pleased to inform you that Ebatco’s Nano Analysis and Testing Laboratory (NAT Lab) now is open to serve your nanoscale mechanical and tribological testing and analysis needs. The NAT Lab’s staff scientists have more than 10 years of nanomechanical and nanotribological testing, applications R&D and instrument development experience. The lab is equipped with state-of-the-art nanoindenters with nm-resolution in-situ SPM imaging capability and full lines of advanced options such as nanoDMA, modulus mapping, feedback control, heating/cooling stage, vacuum chuck, and environmental control and isolation chamber.

Several postdoctoral and PhD research positions are currently open in the Advanced Computational Technology (ACT) group at the University of Pittsburgh for the following research projects in the multidisciplinary areas of computational nanomechanics, bio-nanotechnology, renewable energy, and nanomedicine:

I am currently simulation arc welding process. i have performed plate butt welding using abaqus software. Dflux subroutine was used and the heat source model i used is goldak double ellipsoidal model.

Now i want to apply this technique to the welding of pipes, but currently i am having difficulty with the nodal coordinates. I have defined my glodal CS to cylindrical coordinate system in part and assembly defintion. But after generating the mesh the input file contain nodal coordinates in cartesian coordinates.

My question is what is to be done to get the nodal coordinate in cylindarical form (R, theta, Z) or is there any transformation command in abaqus that i can apply.

I have one solid Y-strucutre model which i have modelled as assuming beam model in NASTRAN. From NASTRAN i am extracting internal loads (Nodal forces and Nodal Moments) successfully and then i am doing the strength analysis of perticule section by using internal loads. Now i have model the same structure using 3D solid finite element model by assuming Tet Mesh under ABAQUS. Analysis was running perfectly in ABAQUS. Now my problem is how to extract the internal loads from the 3D solid Tet mesh model for the same section. I need help to extract the internal loads from the solid Tet mesh. Please help me i am right now stuck at this point.

Materials design principles of ancient fish armour

Benjamin J. F. Bruet, Juha Song, Mary C. Boyce & Christine Ortiz

Abstract :

The number of registered users of iMechanica passed 8000 this afternoon.  The total number of posts is 3622, and the total number of comments 8429.  The total number of hits was 3.4 millions in March, 5.6 millions in April, 2.4 millions in May, and 2.7 millions in June.

Computational Mechanics Engineer 

I'm working on the numerical solution of the mixed problem in lubricated contacts. Does anyone know if the lubricant equation (Reynolds one) was never solved for film thickness instead of pressure (like actually is done with MGMI techniques) in some pubblication?

I would be gratefull in advance if you send me an illustrative examples about how to find out the natural frequencies and mode shape of rotor-bearing system by using abaqus.

The surface stability of thin film/substrate system is an important problem both in the film synthesis and reliability of micro electrical and mechanical system (MEMS). In this work, the elastic anisotropy effect on surface stability of thin film/substrate system was considered. The theoretical analysis indicates that elastic anisotropic influence could play an important role in the surface stability of thin film/substrate system.

We present a top-down hierarchical computational framework for mechanobiology problems, the molecular dynamics decorated finite element method (MDeFEM). The MscL in Escherichia coli was given as an example with its continuum model built under the instruction of MDeFEM framework.  Its gating pathways under various external perturbations were investigated, which are in good agreement with current experimental data and all-atom simulation results. The MDeFEM method showed its advantages and great potential in solving the mechanical responses of large biomolecules with complex geometries, which often involves multiple temporal and spatial scales.