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Through thickness residual stress

Submitted by shtorabian on
residual stress
ABAQUS 6.14
Through thickness
I am modeling through thickness residual stresses as follows:
*Initial Conditions, Type=Stress, Section Points
all_elements, 1, 50,25, 0
all_elements, 2, 50,25, 0
all_elements, 3, 50,25, 0
all_elements, 4, 50,25, 0
.
.
ABAQUS documentation 6.14:

Data lines for TYPE=STRESS, SECTION POINTS: 

First line:

Element number or element set label.
Section point number.
Value of first stress component.
Value of second stress component.
Etc., up to three stress components.

An efficient computational technique for modeling dislocation–precipitate interactions within dislocation dynamics

Submitted by keyhani on
research

A new computational technique for modeling dislocation interactions with shearable and non-shearable precipitates within the line dislocation dynamics framework is presented. While shearable precipitates are modeled by defining a resistance function, non-shearable ones are modeled by drawing a comparison between the two well-known Orowan and Frank–Read mechanisms. The precipitates are modeled directly within the dislocation dynamics analysis without the need for any additional numerical methods.

Call for Abstracts: SES 2016 Symposium E-8: Dynamic Failure, Fragmentation, and Localization

Submitted by Justin W. Wilkerson on

Dear Colleagues:

Please consider submitting abstracts to Symposium E-8: Dynamic Failure, Fragmentation, and Localization at the 53rd Annual Technical Meeting of the Society of Engineering Science to be held at the University of Maryland at College Park, October 2-5, 2016. 

The deadline for abstracts is June 15th, 2016. 

University of California Merced - Post Doc and Grad Student Openings

Submitted by amartini on
job

We have openings for post docs and grad students to develop and use atomistic simulations to investigate surface and interface phenomena. Specific research focuses will depend on the applicant’s background, but may include characterization of the interactions and reactions between metallic surfaces and various industrially-relevant liquid adsorbates and exploration of the effects of coupled stresses in determining the size of the contact between nanoscale bodies.

Postdoctoral fellowships in computational mechanics

Submitted by daya.reddy on
job

Applications are invited for two postdoctoral fellowships, attached to the South African Research Chair in Computational Mechanics at the University of Cape Town, South Africa. Preference will be given to candidates with experience in one or more of the following areas: finite element methods for GPUs; preconditioned solvers in nonlinear mechanics; operator-splitting methods for coupled problems. 

Critical length scale controls adhesive wear mechanisms

Submitted by Ramin Aghababaei on

The adhesive wear process remains one of the least understood areas of mechanics. While it has long been established that adhesive wear is a direct result of contacting surface
asperities, an agreed upon understanding of how contacting asperities lead to wear debris particle has remained elusive. This has restricted adhesive wear prediction to empirical
models with limited transferability. Here we show that discrepant observations and predictions of two distinct adhesive wear mechanisms can be reconciled into a unified

Critical length scale controls adhesive wear mechanisms

Submitted by Ramin Aghababaei on

The adhesive wear process remains one of the least understood areas of mechanics. While it has long been established that adhesive wear is a direct result of contacting surface
asperities, an agreed upon understanding of how contacting asperities lead to wear debris particle has remained elusive. This has restricted adhesive wear prediction to empirical
models with limited transferability. Here we show that discrepant observations and predictions of two distinct adhesive wear mechanisms can be reconciled into a unified

Electrical properties and piezoresistive evaluation of polyurethane-based composites with carbon nano-materials

Submitted by Hamid Souri on
research
Expanded graphite; Graphite nanoplatelet; Three-roll milling process; Electrical characteristics; Piezoresistivity; Polyurethane; Composite

The present study assesses the applicability of carbon materials-embedded polyurethane (PU) composites characterized by high piezoresistive capability, as a traffic loading sensor. PU composites incorporating multi-wall carbon nanotubes (MWNTs), expanded graphite (EG), and a hybrid of MWNTs and graphite nanoplatelets (GNPs) were fabricated and their electrical conductivities were measured in an effort to determine the most suitable filler type for the piezoresistive sensor and its optimum content ratio.

A facile method for transparent carbon nanosheets heater based on polyimide

Submitted by Hamid Souri on
research
Thin film heater; Polyimide; Transparent

In this work, a novel film heater in nanometer-scale thickness based on catalyst-free and transfer-free carbon nanosheets (CNSs) with properties similar to graphene is fabricated. Here, poly(amic acid) (PAA), which is composed of several aromatic hydrocarbon rings, is used as the carbon precursor of CNS films. Altering the polymer concentration easily controls the morphological, optical, and electrical properties of the CNS films obtained by carbonization of PAA thin films.

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