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PhD position in Hydraulic Fracture at University of Houston

Submitted by Reza Mousavi on

There is an open position for PhD at University of Houston in the area of structural engineering and computational mechanics. The student will start as TA and then switch to RA hopefully in the subject of hydraulic fracturing. If you find yourself interested in the subject, please send your CV to m.reza.mousavi [at] gmail.com .

Eighty Years of Dislocation Theory and Work Hardening

Submitted by Kamyar M Davoudi on
work hardening
dislocation theory
On February 7, 1934, two consecutive papers by Sir Geoffrey Ingram Taylor were received and so the dislocation theory was born and the first attempt at describing work hardening was made. Before that date, it was known that there was a big gap between the ideal and the experimentally observed shear strength. While according to the calculations, the shear strength had to be of the order of one tenth (or with finer models one thirtieth) of the shear modulus, the measured shear strength was several orders of magnitude smaller. This large discrepancy brought about Geoffrey I.Taylor, Egon Orowan and Michael Polyani to independently postulate the existence of dislocations. Papers by Orowan and Polyani were published consecutively in one volume of Zeitschrift für Physik.

Caltech: secrets of the world’s number one university

Submitted by Jizhou Song on
education

Good International news on Caltech and engineering. Ares Rosakis, chair of the Division of Engineering and Applied Science,describes Caltech as “a unique species among universities…a very interesting phenomenon”.More can be found in the attachment or at the link below

http://www.timeshighereducation.co.uk/features/caltech-secrets-of-the-w…

instability induced by incoherent twin boundary in nanotwinned copper

Submitted by Rongmei niu on
research
TEM
nanotwinned copper
coherent and incoherent twin boundary

1. Strain hardening and softening in nanotwinned Cu:

Nanotwinned Cu foils with about 99% coherent twin boundaries (TBs) among all the boundaries were made. These coherent

TBs, with an average spacing of 25 nm, were engineered approximately parallel to foil surfaces. Low plane-strain deformation

enhances the hardness by refining microstructure and introducing dislocations. High plane-strain deformation results in crystallographic

lattice rotation and reaction between dislocations and coherent TBs, and induces incoherent TBs, thus twin coarsening and

buckling

Submitted by mahdi.ahmadpor on
research

dear all : Ihave problem in  dynamic buckling analysis in abaqus ,I simulated a shell part and put it between  two rigid plates and next i put velocity on the one of the rigid plate for buckling-my value of velocity is 8.33e-5 and its very small value .now after the analysis the shell body was not crushed when i increase the value of velocity the crush will occur but i want crush will occur with this velocity and i dont know what do i.please help me.

Call for Abstracts for IMECE 2014: topic 11-13: Nanomaterials for Energy and publish in Journal of Nanotechnology in Engineering

Submitted by HsiaoYing Shad… on
conference
Dear Colleagues,

The ASME Journal of Nanotechnology in Engineering and Medicine (JNEM) has agreed to accept and publish high-quality conference proceedings that will be presented in the upcoming ASME IMECE 2014 “Topic 11-13 “Nanomaterials for Energy” (http://www.asmeconferences.org/congress2014/).

cantilever with end moment

Submitted by mjalilych1 on

hello Dear friends

I am working on large deflection of cantilevers with total lagrangian approach. my code is converged very well in cantilever with end point load but when I apply end moment the problem does not converged and tangent stiffness matrix became singular. if there is any special note that I ignored. please help me.

low reynolds number flow over a capsule in fluent

Submitted by jjprince522 on
education

I've been trying to simulate flow conditions at 100 km altitude over a re entry capsule in fluent.

Conditions are

Temperature:
168.7219
K

Density = 0.000000577 Kg/m3

Pressure = 0.0289 N/m2 

I tried using laminar and k-w model. The solution does not converge even after 50000 iterations using the density based solver and ideal gas equation.

Is there a way to go about it?

Please let me know. 

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