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Predictive Theoretical and Computational Approaches for Additive Manufacturing

On October 7-9, 2015, the U.S. National Committee on Theoretical and Applied Mechanics (USNC/TAM) held a Workshop on Predictive Theoretical and Computational Approaches for Additive Manufacturing in Washington, DC.  The three-day workshop featured 24 presentations from speakers in academia, industry, and government labs.

On the overall yield function of a hollow sphere

  Motivated mostly by analytical (or formal) considerations, a vast majority of the works dedicated to the study of the overall plastic response of a porous metal assumes that the sound material (or matrix) obeys a quadratic yielding criterion (von Mises or Hill'48). However, most metals of technological interest today feature significant deviations from the quadratic form of yielding. Therefore a realistic modeling of their behavior, while sustaining damage,  requires appropriate consideration of their yielding properties.

abouibes's picture

Bonds, bands and elasticity of smithsonite rock

The objective here is to spread out in detail the various fundamental state properties of smithsonite rock (ZnCO3) for which the most intrinsic quantities remain still unknown. First-principles electronic structure calculations based on the density functional theory with the pseudopotential method were performed using diverse functionals. A number of mechanical quantities were evaluated such as bulk modulus, elastic constants, Young's and shear moduli, and transversal and longitudinal sound velocities (VS and VP).

mortezaamjadi's picture

Computational analysis of metallic nanowire-elastomer nanocomposite based strain sensors

Possessing a strong piezoresistivity, nanocomposites of metal nanowires and elastomer have been studied extensively for its use in highly flexible, stretchable, and sensitive sensors. In this work, we analyze the working mechanism and performance of a nanocomposite based stretchable strain sensor by calculating the conductivity of the nanowire percolation network as a function of strain. We reveal that the nonlinear piezoresistivity is attributed to the topological change of percolation network, which leads to a bottleneck in the electric path.

en_brown's picture

Journal of Dynamic Behavior of Materials finishes its first year

The December Issue of JDBM is now available, completing the first year of this new journal sponsored by the Society for Experimental Mechanics.  Springer is making all papers freely available for the first two years.

Xuanhe Zhao's picture

Tough Soft Wet Adhesion

Tough bonding of hydrogels to diverse non-porous surfaces

Hyunwoo Yuk, Teng Zhang,Shaoting Lin, German Alberto Parada & Xuanhe Zhao

Nature Materials (2015) doi:10.1038/nmat4463

A design strategy for tough bonding of hydrogels to diverse solids.

Ashby PhD Scholarship in the Mechanics of Materials

A fully funded PhD scholarship exists in the area of mechanics of materials, endowed in honour of Prof M F Ashby. The successful applicant will have a 1st class degree (and ideally a Masters degree) in an appropriate field. The precise topic of the PhD can be fixed after the scholarship has been awarded.

Further details may be obtained from Ms H A Gardner ( .

Teng Li's picture

Reception in celebration of the 1st anniversary of Extreme Mechanics Letters

Extreme Mechanics Letters (EML) is turning 1. Come and join us for a reception to celebrate the 1st anniversary of EML during the 2015 MRS Fall Meeting.  See the attached reception flyer for details. All are welcome! 

Location: Sheraton Boston Hotel, Gardner, 3rd Floor

Address: 39 Dalton St, Boston, MA 02199

Date: Wednesday, December 2, 2015 

Time: 7:00 pm to 9:00 pm

Arun Prakash's picture

A multiscale simulation framework of the ARB process

The accumulative roll bonding process is one of the most prominent severe plastic deformation processes for obtaining sheet materials with ultra-fine-grained microstructures and high strength. The properties of such sheets differ significantly from those of conventionally rolled sheets. It is hence desirable to have a simulation framework that can accurately predict the material properties, including the evolving texture and anisotropy during processing.

Osama R. Bilal's picture

Now receiving submissions, Extreme Mechanics Letters – Special Issue on ‘Frontiers of mechanical metamaterials’

This themed issue on mechanical metamaterials invites contributions from different perspectives with the aim of highlighting the latest advances in the field.

The themed issue will focus on mechanical metamaterials in the general sense. This includes acoustic and elastic metamaterials as well as other types of metamaterials with unique mechanical and/or thermal properties at any length scale.

Topics of interest include the following:

Second derivatives of displacement field ABAQUS


Hello everyone,


I need to compute the second derivatives of displacement field in ABAQUS, in the integration point of quadratic elements if it is possible. I thought about using USDFLD subrutine, but I am stuck with getting the Jacobian matrix that couples the isoparametric space with the physical space in ABAQUS. GETVRM is what everyone suggests to get variables from abaqus, however I did not find the definitions of JMAC, JMATYP... so I do not know what I can get from that subrutine exactly.


mortezaamjadi's picture

Finger Motion Detection Glove Toward Human-Machine Interface

Finger motion capturing systems have a wide variety of applications such as telerobotics, rehabilitation, and avatar control. While commercial devices are too costly, studies on such systems are either impractical to use or have speed limitations. This paper proposes a practical version of the glovebased finger motion capturing system.

User friction model in Abaqus : how to code an hysteretic friction behaviour ?

Hello everyone,

I have to use an hysteretic friction model. I am trying to code this in Abaqus by using the FRIC subroutine. The language is Fortran 77.

I am testing my code on a very simple model : two plates sliding on eachother. I apply a 1 cycle sinus displacement at the end of one plate and a apply some boundaries at the other side.

computational nonlinear elasticity references

Choose a channel featured in the header of iMechanica: 

I will be developing constitutive material models into commercial FE codes for nonlinear elasticity and searching for good books to get started for computational aspects. There are many good books for computational plasticity but I did not find any for nonlinear elasticity. Suggestion for good books or references is welcome.

Siva P V Nadimpalli's picture

Real-Time Stress Measurements in Germanium Thin Film Electrodes during Electrochemical Lithiation/Delithiation Cycling

Real-Time Stress Measurements in Germanium Thin Film Electrodes during Electrochemical Lithiation/Delithiation Cycling (

Siva P. V. Nadimpalli, Rajasekhar Tripuraneni, and Vijay A. Sethuraman

Siva P V Nadimpalli's picture

Stress Evolution in Lithium-ion Composite Electrodes during Electrochemical Cycling and Resulting Internal Pressures on the Cell Casing

Stress Evolution in Lithium-Ion Composite Electrodes during Electrochemical Cycling and Resulting Internal Pressures on the Cell Casing (

Siva P.V. Nadimpalli, Vijay A. Sethuraman, Daniel P. Abraham, Allan F. Bower, and Pradeep R. Guduru

Shailendra's picture

Suppression of Shear Banding and Transition to Necking and Homogeneous Flow in Nanoglass Nanopillars

In order to improve the properties of metallic glasses (MG) a new type of MG structure, composed of nanoscale grains, referred to as nanoglass (NG), has been recently proposed. Here, we use large-scale molecular dynamics (MD) simulations of tensile loading to investigate the deformation and failure mechanisms of Cu64Zr36 NG nanopillars with large, experimentally accessible, 50 nm diameter.

Hydraulic Fracture and Toughening of a Brittle Layer Bonded to a Hydrogel

AbstractBrittle materials propagate opening cracks under tension. When stress increases beyond a critical magnitude, then quasistatic crack propagation becomes unstable. In the presence of several precracks, a brittle material always propagates only the weakest crack, leading to catastrophic failure. Here, we show that all these features of brittle fracture are fundamentally modified when the material susceptible to cracking is bonded to a hydrogel, a common situation in biological tissues.

Christian Linder's picture

Understanding geometric instabilities in thin films via a multi-layer model

Dear Colleagues,

I want to share with you our work on geometric instabilities in thin films, which was recently accepted in Soft Matter.

hamidsouri's picture

A zinc oxide/polyurethane-based generator composite as a self-powered sensor for traffic flow monitoring

A zinc oxide (ZnO)/polyurethane (PU)-based generator composite was fabricated and its piezoelectric performances were examined in the present work. In addition, the influence of multi-wall carbon nanotubes (MWNTs) and copper powder incorporation on the piezoelectric performance of composites was also studied. The performance level of the composites with various ratios of the constituents was compared in terms of piezoelectric responses obtained from three different tests, i.e., foot stamping, vehicle loading, and cyclic wheel loading tests.


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