I am working on thermal buckling of annular FGM plates using the DQ method in FORTRAN. The results show that for simply-simply edges, the nonlinear thermal buckling loads are greater than those of eigen buckling loads. But for clamped-clamped edges, as it may be expected, the nonlinear buckling loads are under estimate, i.e. they are lower than eigen buckling loads.Why?

Is it possible that the nonlinear buckling analysis gives us an over estimate load ?

From: Bar-Cohen, Yoseph (355N) <yoseph.bar-cohen [at] jpl.nasa.gov (yoseph[dot]bar-cohen[at]jpl[dot]nasa[dot]gov)>

Dear Colleague,

I am very pleased to inform you that the 23rd issue of the WW-EAP Newsletter is now available at: 

I now have several openings for Masters and PhDs for the following projects:

1) Biomimetic study of the structure, mechanics and design of fish scales (funding: NSF). Involves atomic force and scanning electron microscopy, mechanics of composites and fracture, small scale and in-situ testing, multiscale modeling.

Usually, the position of points in Mohr's circle is attributed to a sign convetion related to shear stresses. It is shown that points in the circle related to shear stresses generating a clockwise moment are in the upper half of the circle as a consequence of the position of principal directions, not due to a convention. I hope this note could help to explain better the use of Mohr's circle in plane stress states.

Dear all,

 On Thursday 28th and Friday 29th of October 2010, we will organise a course on using the CONTACT software at Delft University of Technology in the Netherlands.

The aims of the course are:

 Data Storage Institute in Singapore (www.dsi.a-star.edu.sg) has an immediate opening for a Post Doctoral Fellow in Tribology of Magnetic Data Storage System. The PDF will be involved in the research and development of advanced overcoats and lubricants for future magnetic data storage systems. A PhD degree in Mechanical/Chemical Engineering, Materials Science & Engineering, Physics/Chemistry is essential for this position. Good testing skills and strong research experience are desirable.

Hi all ... Is there a way to find/calibrate material parameters for johnson and cook material model using experimental data in Abaqus? .. As far as i know abaqus has something called as data editor with which Hyperelastic materials models can be calibrated with experimental results. If not is there any other way arround to do calibration of material parameter with abaqus.