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shimahajimirza's picture

Open Post-doc position at Energy- Control and optimization lab

Energy, Control and Optimization (ECO) lab https://www.ecolab.tamu.edu/ in the Department of Mechanical Engineering at Texas A&M University has one post-doc position. The research project is about energy conversion in Nano-materials and thin film solar cells. Candidates should have a strong background and interests in Radiative Heat Transfer, Nano-Materials, Nanofabrication, Computational Methods and Machine Learning. Programming experience in MATLAB or Python is necessary.

Vivekanandan A's picture

Using LEFM for analyzing crack in a non linear material

Dear all,

I am trying to find the crack tip SIF in Polyurethane which an elastomer. It behaves like a nonlinear elastic material with the initial small linear elastic region. Can I use a multi-parameter stress field equation (William's crack tip stress field equation) to get the SIF of the crack tip.

Thank you

Jingjie Yeo's picture

Advancing the frontiers of silk fibroin protein-based materials for futuristic electronics and clinical wound-healing (Invited review)

https://doi.org/10.1016/j.msec.2018.01.007 The present review will introduce the basic concepts of silk-based electronics/optoelectronics including the latest technological advances on the use of silk fibroin in combination with other functional components, with an emphasis on improving the performance of next-generation silk-based materials. It also highlights the patterning of silk fibroin to produce micro/nano-scale features, as well as the functionalization of silk fibroin to impart antimicrobial (i.e. antibacterial) properties.

shimahajimirza's picture

Open-PhD Positions in Energy Conversion in Nano Materials and Solar Cells

Energy, Control and Optimization (ECO) https://www.ecolab.tamu.edu/ in the Department of Mechanical Engineering at Texas A&M University has two open PhD positions. The research project is about energy conversion in Nano-materials and thin film solar cells. Candidates should have a strong background and interests in Radiative Heat Transfer, Nano-Materials, Nano fabrication, Computational Methods and Machine Learning. Programming experience in MATLAB or Python is necessary.

Antonio Papangelo's picture

Adhesion between a power-law indenter and a thin layer coated on a rigid substrate

Abstract: In the present paper we investigate indentation of a power-law axisymmetric rigid probe in adhesive contact with a "thin layer" laying on a rigid foundation for both frictionless unbounded and bounded compressible cases. The investigation relies on the "thin layer" assumption proposed by Johnson, i.e. the layer thickness being much smaller than the radius of the contact area, and it makes use of the previous solutions proposed by Jaffar and Barber for the adhesiveless case.

Modeling/defining Loop of blocks of different load amplitude

Choose a channel featured in the header of iMechanica: 

Dear all

In the experiment setup, the fatigue loading spectrum has a loop of 2 blocks of load amplitude. First load amplitude the higher applied for 2X time period followed by lower load amplitude for X time period then the loop repeated till failure.  the load sequence was High-Low and Low-High in this loop. X was in thousands so might be suggested as the cyclic response will be stabilized in the first 10 cycles, the first block will dominate the fatigue behaviour at least till fracture, or damage initiation.

sergkuznet's picture

Topology optimization of magnetic source distributions for diamagnetic and superconducting levitation

Topology optimization is used to obtain a magnetic source distribution providing levitation of a diamagnetic body or type I superconductor with maximized thrust force. We show that this technique identifies non-trivial source distributions and may be useful to design devices based on non-contact magnetic suspension and other magnetic devices, such as micro-magneto-mechanical devices, high field magnets etc.

Mike Ciavarella's picture

A recent PNAS paper explained! FRACTURE MECHANICS SIMPLE CALCULATIONS TO EXPLAIN SMALL REDUCTION OF THE REAL CONTACT AREA UNDER SHEAR

If you have seen the very nice PNAS paper which just appeared

Sahli, R., Pallares, G., Ducottet, C., Ben Ali, I.E., Al Akhrass, S., Guibert, M., Scheibert, J., 2018, Evolution of real contact area under shear, Proceedings of the National Academy of Sciences, 115(3), pp. 471-476.

Here we provide a simple explanation.

FACTA UNIVERSITATIS

Series: Mechanical Engineering

DOI: 10.22190/FUME180108007C

Short Communication

FRACTURE MECHANICS SIMPLE CALCULATIONS TO EXPLAIN SMALL REDUCTION OF THE REAL CONTACT AREA UNDER SHEAR

UDC 539.6

Emilio Martínez Pañeda's picture

Non-local plasticity effects on notch fracture mechanics (code included)

I hope some of you find this work interesting, the code with the control algorithm (Segurado and Llorca, 2004) to avoid convergence problems in cohesive zone model analyses of crack propagation can be downloaded from empaneda.com/codes (documentation and Abaqus input files are provided).

Non-local plasticity effects on notch fracture mechanics

Emilio Martínez-Pañeda, Susana del Busto, Covadonga Betegón 

Theoretical and Applied Fracture Mechanics (2017)

Mahdi Z.'s picture

Mechanics of an elastic solid reinforced with bidirectional fiber in finite plane elastostatics

A continuum-based model is presented for the mechanics of bidirectional composites subjected to finite plane deformations. This is framed in the development of a constitutive relation within which the constraint of material incompressibility is augmented. The elastic resistance of the fibers is accounted for directly via the computation of variational derivatives along the lengths of bidirectional fibers. The equilibrium equation and necessary boundary conditions are derived by virtue of the principles of virtual work statement.

Arash_Yavari's picture

Compatible-Strain Mixed Finite Element Methods for Incompressible Nonlinear Elasticity

We introduce a new family of mixed finite elements for incompressible nonlinear elasticity — compatible-strain mixed finite element methods (CSFEMs). Based on a Hu-Washizu-type functional, we write a four-field mixed formulation with the displacement, the displacement gradient, the first Piola-Kirchhoff stress, and a pressure-like field as the four independent unknowns. Using the Hilbert complexes of nonlinear elasticity, which describe the kinematics and the kinetics of motion, we identify the solution spaces of the independent unknown fields.

Wenbin Yu's picture

Some ideas for a possible new journal

Inspired by the discussion with Mike Ciavarella on http://imechanica.org/node/22012, I am thinking about a journal with the following attributes:

Ajeet Kumar's picture

An asymptotic numerical method for continuation of spatial equilibria of special Cosserat rods

We present an efficient numerical scheme based on asymptotic numerical method for continuation of spatial equilibria of special Cosserat rods. Using quaternions to represent rotation, the equations of static equilibria of special Cosserat rods are posed as a system of thirteen first order ordinary differential equations having cubic nonlinearity. The derivatives in these equations are further discretized to yield a system of cubic polynomial equations.

Partial constraint singularities in elastic rods

We present a unified classical treatment of partially constrained elastic rods. Partial constraints often entail singularities in both shapes and reactions. Our approach encompasses both sleeve and adhesion problems, and provides simple and unambiguous derivations of counterintuitive results in the literature. Relationships between reaction forces and moments, geometry, and adhesion energies follow from the balance of energy during quasistatic motion. We also relate our approach to the configurational balance of material momentum and the concept of a driving traction.

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