In this case study, based on work carried out at Imperial College and University College London, research was carried out into the performance of solid oxide fuel cells (SOFCs). The microstructure of an SOFC electrode was obtained using FIB tomography, and a volume mesh generated in Simpleware software, with the model then exported to Abaqus CAE. Boundary conditions were set in the solver and stress analysis conducted, which were able to approxiamte peak maximum principal stresses in response to thermal expansion.

A more detailed version of the case study is available here: http://simpleware.com/industries/materials/composites/case-study-fuel-cell-microstructure.html

For more materials case studies, and to learn more about our software's ability to convert 3D image data into robust models for CAD, FEA, CFD and 3D Printing, please visit www.simpleware.com.

Hi everyone!

I was hopping to find some help over here. I just need some references or links to the true stress-strain curves of differents metals. I'm working with Tin and i'm going to do run some compression test to valid an analitic method. In order to do this, I need the strain-hardening exponent (n) and the strength coefficient (C) and it's being impossible to find those.

So, if anybody can point me in the right direction, any book, any webside, any program, with the true stress-straun curves whith wich I can deduce n and C, or any Table with these coefficients, I will be very grateful.

Thank in advance!

Dear Colleagues,
I'm trying to model the ISO tests (as per ISO 1496-3) for a tank container subjected to static and dynamic loading using finite element technique. Regrading this work sufficient research papers are not available. Another thing is that, for fail-safe design and fatigue analysis there is no such documents known to me. Can you please help me in this regard?
Guidance from experienced colleague is highly solicited.

Fully funded PhD studentship at The Open Univeristy campus, Milton Keynes, UK. The aim of this project is to optimise experimental techniques such as digital image correlation (DIC) and focused ion beam (FIB) hole drilling to investigate the micro scale stresses and strains occurring during martensitic transformations. The techniques will be applied to a range of materials from simple steels to complex shape memory alloys. There will also be scope within the project to study martensitic alloys using central facilities such as the ILL, ESRF and Diamond light source.

The project will suit a candidate with a mechanical engineering or materials first degree. Due to the scope of the project, experience of materials testing and steel metallurgy is desirable, however not essential.

For more information please see: http://materials.open.ac.uk/positions/index.htm

As the 2010 SIMULIA Customer Conference approaches, it reminds me of a thought-provoking presentation given by Dale Berry of SIMULIA at the 2009 SCC in London.

He reminded the audience, of engineers and researchers, that Realistic Simulation is not only good for evaluating mechanical behavior of product performance, but it’s also an indespenible tool for driving innovative research that improves our lives and society.

Read the complete blog post for examples highlighed by Dale that illustrate how realistic simulation can help improve our society including: Cocunut Fiber Analysis, Red Blood Cell Analysis, Vibration Barrier Analysis, and as mentioned in recent posts on iMechanica, Snail Armor analysis. Check out the blog post here:

http://perspectives.3ds.com/2010/04/20/coconuts-blood-cells-and-snail-armor-oh-my/

Thanks for checking it out. Let me know what you think and if you have other suggestions for future blog post on the use of Abaqus for innovative research

Tim

hi

i am having problems solving two solid mechanics problems... can anyone please help??? the problems are:

Question 4:

A 2380 Nm torque is applied to gear D due to input torque from the motor at A, as shown in figure 4. Shafts 1 and 2 are both solid steel, 44 mm in diameter and 600 mm long. Gear B has a diameter of 250 mm and gear C has a diameter of 350 mm. The shear modulus G for steel is 80GN/m^2

Find out:

(a) the maximum stress in shaft 2

(b) the maximum stress in shaft 1

(c) the rotation angle of gear D relative to the motor at A, due to the loading.

Question 5:

The component shown on figure 5 is rigidly attached to a foundation. The cross section of the component is rectangular. A 5kN concentrated force is applied to the top surface of the component in the direction shown. Find out the stresses acting on the surface at position A and show them on an infinitesimal.

i solved all the other problems...but i am stuck with this 2. can anyone please help!!! i am totaly blind about this topic.... couldn't produce a single equation. please help!!

The best place to start is Wikipedia: http://en.wikipedia.org/wiki/Stereology.

Most active research in stereology is done in medical and biological community.

In engineering, in USA, Prof. Rhines and Prof. de Hoff, both of the University of Florida at Gainesville did a lot of pioneering work. The stereological researchers active in engineering in USA are mostly limited to the "progenies" of the Florida school. These include (and I quote off-hand): Prof. Arun Gokhale of GeogiaTech and Prof. Burton Patterson of the University of Alabama at Birmingham (who was my guide at my first attempt at PhD).

One neat thing about stereological models in diffusion-related phenomena (such as, for instance, theories of sintering in powder metallurgical components) is that the stereological models are, as a rule, far closer to actual physical reality as compared to the mean field theories, because the former have been *local* in nature. In contrast, the mean-field models are more traditional, more popular---and more approximate, because they are less amenable to a direct description in terms of actual diffusive fluxes of the actually diffusing species (atoms).

Since stress concentration is a highly local phenomenon (think St. Venant's principle or the local crack deflection near an inclusion), it would be desirable to have a purely local model for stress analysis, so as to better model the local stress variations at and due to, say, partially debonded interfaces in composites.

To the best of my knowledge, none has put forth something like a truly local model of stress analysis. It will be a wonderful and practically useful innovation to have it.

This blog focuses on viscoelasticity (http://en.wikipedia.org/wiki/Viscoelasticity)

dear Imechanica users,

a wonderful location for our annual italian conference in stress analysis -- see www.aias2007.it. It is organized by our collegues in Università di Napoli, Prof. Renato Esposito. Attached the call for papers in PDF, and more info are below.

Regards, Mike Ciavarella

Call for Papers
AIAS - the Italian Association for Stress Analysis - is
pleased to announce its 36th National Congress, which will
be jointly organized by University of Naples Federico II and
Second University of Naples. The aim of the Association is
to develop the knowledge about stress analysis and experimental
testing of mechanical systems, mechanical design
and mechanical behaviour of material. AIAS Conference is
an important chance for researchers from universities, research
centres and industry to meet and share experiences
and studies. Areas of interest of the AIAS Conference include:
• Experimental Mechanics;
• Mechanics of Materials;
• Mechanics of Vehicles;
• Numerical Methods for Structural Analysis;
• Mechanical Design;
• Product Design;
• Structural Integrity;
• Biomechanics;
• Reliability and Safety of Mechanical Systems.
The deadline for abstract submittal (only through web site)
is March 31, 2007. Upon acceptance, full papers should be
submitted in electronic form by June 30, 2007. The book of
abstracts and the proceedings in CD will be available at the
Conference.
More information on the event will be found on the Conference
web-site www.aias2007.it, now in progress.