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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. 

UPDATED: Nanobrücken 2014 Nanomechanical Testing Workshop

Submitted by Oden Warren on
conference
nanomechanics
Plasticity
nanoindentation
elasticity
simulation
viscoelasticity
nanotribology
Workshop
in-situ

Dear Colleague: You are cordially invited to participate in the Nanobrücken 2014 Nanomechanical Testing Workshop, which will take place March 26-28, 2014 at INM - Leibniz Institute for New Materials in Saarbrücken, Germany. This will be the 4th edition of the annual Nanobrücken workshop series. This year's Keynote Speaker will be Andrew Minor (University of California, Berkeley).

Post-doctorate Positions in Offshore Engineering at National University of Singapore

Submitted by Pang Sze Dai on
job
fracture mechanics
computational mechanics
solid mechanics

The Department of Civil and Environmental Engineering at the National University of Singapore (NUS) is recruiting 2 post-doctorate research fellows to pursue research on ice-structure interaction in the Keppel-NUS Corporate Laboratory. As part of the S$75 million collaboration between Keppel Corporation and NUS, the team comprising of Prof. Andrew Palmer, Dr. Bai Wei, and Dr. Pang Sze Dai, seeks to develop solutions for offshore rigs to meet the challenges of harsh arctic environments in oil and gas exploration and production.

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