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Investigating phase formations in cast AlFeCoNiCu high entropy alloys by combination of computational modeling and experiments

Submitted by mohsenzaeem on
research
high entropy alloys
DFT
phase diagrams
HTXRD
SEM
EBSD

Selection and thermal stability of phases are important in design of high entropy alloys (HEA). In this study, phase formations in cast AlFeCoNiCu HEA were investigated. Ab-initio molecular dynamics (AIMD) simulations were used to determine crystal structures of phases at different temperatures in equiatomic composition of AlFeCoNiCu. The AIMD results showed a possible coexistence of a face-centered cubic (fcc) phase and a bodycentered cubic (bcc) phase at the room temperature and indicated stabilization of a single fcc phase above 1070 K at the equiatomic composition of AlFeCoNiCu.

Regarding implementation of an integration scheme which avoids the need of contact surface segmentation.

Submitted by Vishal Agrawal on
research
computational contact mechanics

Dear All,

As FEA is one of the most popular methods for the treatment of contact problems. In that, the overall contact surface is discretized a number of segments and contact integrals are evaluated in a segment-wise manner. In 2005 Fischer and Wriggers [1] presented an integration method which avoids the need of contact surface segmentations and enables the evaluation of contact integrals directly at the slave nodes of contact bodies. 

Postdoc positions in Nonlinear Solid Mechanics, MIT

Submitted by TalCohenMIT on
research
postdoc
job
mechanics

I am in search of two postdocs to join my group, at MIT, on September 1st , 2017, or earlier. These positions will provide a unique flexibility in choice of research topic which will, in general, target problems in nonlinear solid mechanics. See our group website (http://tal-cohen.wixsite.com/website) for more information on our present research thrusts. Though our primary focus is on theoretical mechanics, candidates with experimental and computational experience are also encouraged to apply.

Seek your input on nano-indentation or basic mechanics of materials

Submitted by L. Roy Xu on
research
Nano-indentation
mechanics of materials
material tests

Dear researchers----We spent more than two years to prepare a research proposal and it was submitted to a federal funding agency (not NSF).  Based on one reviewer’s comments,  the program manager rejected our proposal. Our title is “A Multi-Scale Approach of Combining Nano-indentation with Computational Mechanics to Predict Impact Behavior of Structural Composite Materials”. I only list these comments related to nano-indentation. Your frank opinion is really appreciated.

3D-printing biomimetic structures to reveal the mechanics of natural systems

Submitted by mmporter on
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Michael M Porter 

Natural Engineering Lab, Department of Mechanical Engineering, Clemson University; Zucker Graduate Education Center, N. Charleston, SC, 29405

On a systematic approach for cracked rotating shaft study: breathing mechanism, dynamics and instability

Submitted by saberelarem on
research
Cracked shafts Breathing crack Rotordynamics Instability

We present a systematic approach to deal with the modelling and analysis of the cracked rotating shafts behaviour. We begin by revisiting the problem of modelling the breathing mechanism of the crack.

Here we consider an original approach based on the form we give to the energy of the system and then identify the mechanism parameters using 3D computations with unilateral contact conditions on the crack lips.

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