Strain gauges are widely used across all engineering fields to measure mechanical deformation of a solid object. The most common type of strain gauges consists of a patterned metal foil on a stiff plastic backing sheet glued to the solid object. Deformation in the object leads to deformation in the foil, thereby causing its electrical resistance to change. The fractional change in resistance, ΔR/R0, is related to the mechanical strain by the gauge factor (GF): GF = (ΔR/R0)/ε. The GF for metallic foils are typically between 2 to 5 , due mostly to changes in length and cross-sectional area. Compared to metallic foils, semiconductor devices can exhibit much larger GF due to piezoresistive effects  where the resistivity changes rapidly with strain due to the dependence of the bandgap on inter-atomic spacing. For example, the gauge factor of p-type  single crystalline silicon can be as high as 200 . As a result, for precision measurements, semiconductor gauges, also called piezoresistors, are preferred over metal foils. These types of devices are widely used as ‘hard’ sensors attached to stiff materials such as metals, concretes and high modulus plastics for structural health monitoring or quantifying specimen deformation.
COURSE NL14: NONLINEAR COMPUTATIONAL SOLID & STRUCTURAL MECHANICS. Theoretical formulations, technologies and computations.Submitted by eli_compmech on Fri, 2013-12-20 11:00.
We are glad to announce the 2014 version of the course:
NONLINEAR COMPUTATIONAL SOLID & STRUCTURAL MECHANICS. Theoretical formulations, technologies and computations. Pavia, May 5-9, 2014
Applications are invited for one postdoctoral position in Experimental
Granular Physics with the Collective Interactions Unit at the Okinawa
Institute of Science and Technology (OIST). Our group is broadly
interested in experimental softmatter physics, continuum mechanics, and
applied mathematics, and their application to biologically inspired
questions. Our current emphasis is on interfacial fluid dynamics,
disordered granular solids, and biomechanics of the human foot. For
further details about our group, please visit https://groups.oist.jp/ciu/
I tried to solve the problem
that a rigid disc under harmonic moments resting on a porous half-space, the
porous medium is modeled using Biot's theory, when I consider the disc as
totally impervious, I found from the numerical results that negative damping
appears when the permeability of the porous medium is very low at a small
exciting frequency. I have no idea whether this is possible, can someone give
me some suggestions? Thanks very much.
I am trying to model the soil churning action of a rotary tiller trough soil structure interaction. Based on some published articles, DEM and SPH approach both have been used to model the tool interaction with the soil. I am little confused in the selection of the appraoch. Can somebody throw some light on advantages and disadvantages of one approach over another and which approach should be chosen for more realistic results.
Two PhD positions on experimental and computational multiscale mechanics at Eindhoven University of Technology, the NetherlandsSubmitted by jhoefnagels on Thu, 2013-12-19 07:13.
Our Mechanics of Materials Group at Eindhoven University of Technology, the Netherlands has two openings for talented PhD students in the field of multiscale mechanics of materials. They are part of a European Union funded project on multiscale methods for advanced materials. One opening is on the development of a fundamentally new multiscale approach towards material modelling and the other aims to integrate this approach with experimental methods.
my problem is dealing with a fatigue crack propagation analysis using XFEM (linear elastic case) with a prescribed initial imperfection in the modeled solid. What is the criterion to exit from such a kind of analysis?
Thank you in acvance!
The Nanomechanics Simulations Laboratory at the Mechanical
Engineering Department, Technion, Israel, is recruiting Postdoctoral
researchers and/or PhD candidates in the area of modeling the plastic deformation of metallic specimens at the nanoscale.
The research involves performing simulations at various scales
(Molecular Dynamics, Dislocation Dynamics and Finite Elements Analysis).
We are looking for highly motivated applicants, who are familiar with
modeling mechanical properties. Applicants with a strong background in
modeling crystal plasticity models in finite element analysis are highly
encouraged to apply.
International Workshop 'Modeling and development of nanostructured materials for biomedical applications',Submitted by Leon Mishnaevsky on Tue, 2013-12-17 08:10.
OBJECTIVES AND TOPICS
nanoengineering technologies and creation of nanomaterials opened new
perspectives for a number of areas of industry and everyday life. These
materials demonstrate increased strength, toughness, biocompatibility,
and can ensure higher service properties, reliability and lifetime of
devices and systems.
Post-Doc Position: Colloids in polymer systems: Numerical studies and simulations
The Material and Process Simulation group at the University of Bayreuth is offering a
1 Post-Doc Position TV-L E13 (m/f)
Colloids in polymer systems: Numerical studies and simulations
Today i post the most downloaded articles of Theoretical and Applied Mechanics Letters(TAML). Hope that will do some help for you!
Most Dowloaded Articles:
Do Eshelby forces exist in elastic structures?
We provide a positive answer to this question, see http://www.ing.unitn.it/~bigoni/eshelbylikeforce.html
Abstract submission to a technical session entitles "Resin System Technology" at CAMX (Created by SAMPE and ACMA) which will be held on October 13-16, 2014 in Orlando, Florida.
Dear Colleagues and Friends,
The Research and Graduate Studies office has established a position to support research needs and the services offered in its college of engineering at the Texas A&M University - Qatar (http://www.qatar.tamu.edu/). The Central Materials Facility is one of the centralized laboratories under RGS that caters to the material characterization needs of all TAMUQ programs that employ this facility in research endeavors and teaching programs. Multiple fields of scientific research including: engineering, metallurgy, geology and sciences, use the equipment located in this facility. Furthermore, this facility participates in Technical Services, which facilitates local members of industry and academia to employ the facilities and equipment for their own needs.
We have a number of new case studies at www.simpleware.com, which cover recent applications of our 3D image to model software in the fields of Biomedicine and Materials research.
Researchers at the City College of New York developed Finite Element head models using Simpleware as a way of simulating the effects of Transcranial Direct Current Stimulation on patients with neurological conditions - http://simpleware.com/industries/medical-and-dental/case-study-tdcs.html
As part of USNCTAM2014 (17th U.S. National Congress on Theoretical & Applied Mechanics) to be held at Michigan State University, East Lansing, Michigan from June 15-20, 2014, we are organizing a Minisymposium
Damage Mechanics of Solids and Structures
within the Mechanics of Solids and Structures Technical Track. Detailed information on the conference is available at http://www.usnctam2014.org
As part of USNCTAM2014 (17th U.S. National Congress on Theoretical & Applied Mechanics) to be held at Michigan State University, East Lansing, Michigan from June 15-20, 2014, we are organizing a Minisymposium entitled
Mechanics and Physics of Soft Matter Materials
The Applied Mechanics Division (AMD) of the American Society of Mechanical Engineers (ASME) strives to foster the intelligent use of mechanics by engineers and to develop this science to serve the needs of the engineering community. The AMD was founded in 1927 with Stephen Timoshenko as its first chair. AMD’s publications include the Newsletters of the Applied Mechanics Division, the Journal of Applied Mechanics, and Applied Mechanics Reviews.
It might be fun for us to work together to collect phenomena of large elastic deformation. These phenomena will enliven teaching and motivate research. As inspiration, here are two albums of fluid motion
I've been working on crack propagation problem by cohesive elements in Abaqus.
I have a sandwich struture where adhesive bonds two steels together. And I've attached part of my input file in the following.
I can have the stress and strain distribution, but I really expect the crack will propagate in the midplane of the adhesives. I don't know whether I have to preset a line in the middle of adhesive as existing crac, or I can set some crack interaction to get the crack growth result.
Graduate student research positions are available in Professor
Martini’s Fundamental Tribology group in Mechanical Engineering at the
University of California Merced. UC Merced is the 10th campus of the University
of California system, opened in 2005, with a rapidy growing research program. Professor Martini’s
group focuses on computational modeling of friction, wear and lubrication of
sliding surfaces, with particular emphasis on nanoscale interfacial phenomena.
Prospective applicants should contact Professor Martini directly.