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Emilio Martínez Pañeda's picture

Crack Growth Resistance in Metallic Alloys: The Role of Isotropic Versus Kinematic Hardening

We have always modelled crack propagation under monotonic/static loading in metals assuming isotropic hardening. However, we show that anisotropic/kinematic hardening effects play a significant role due to non-proportional straining with crack advance; the isotropic hardening idealization leads to steady state fracture toughness predictions that could be 50% lower. I hope that some of you find this work interesting.

Emilio Martínez-Pañeda, Norman A. Fleck. Crack Growth Resistance in Metallic Alloys: The Role of Isotropic Versus Kinematic Hardening. 

Zhaohe Dai's picture

Mechanics of spontaneously formed nanoblisters trapped by transferred 2D crystals

Mechanics of Spontaneously Formed Nanoblisters Trapped by Transferred 2D Crystals. Proceedings of the National Academy of Sciences 2018 - Layered systems of 2D crystals and heterostructures are widely explored for new physics and devices. In many cases, monolayer or few-layer 2D crystals are transferred to a target substrate including other 2D crystals, and nanometer-scale blisters form spontaneously between the 2D crystal and its substrate.

Applied Mechanics Division – Haythornthwaite Foundation Research Initiation Grants 2018

With funding from the Haythornthwaite Foundation, the Executive Committee (EC) of the Applied Mechanics Division (AMD) of ASME is pleased to announce the establishment of the Haythornthwaite Research Initiation Grant Program, targeting university faculty engaged in research in theoretical and applied mechanics that are at the beginning of their academic careers.

Yizhe_Tang's picture

The plausibility of <c + a> dislocation slip on {-12-11} planes in Mg

Dear Colleagues,

Please see the link for a recent article published in Scripta Materialia. In this article, active cross-slip behavior of screw <c + a> dislocations in Mg is observed, and the plausibility of <c + a> dislocation slip on new planes {-12-11} that have hitherto not been considered possible, is shown for the first time.

K.Kanistras's picture

Fully Funded Ph.D. Position

A Ph.D. position is available in the Mechanical and Aerospace Engineering Department at the University of Alabama in Huntsville starting Spring Semester 2019. The focus of the project is on the performance enhancement of aerodynamic systems using fluidic and smart material actuators such as piezoelectric-based synthetic jets and micro fiber composites.

Mahdi Z.'s picture

Gradient elasticity theory for fiber composites with fibers resistant to extension and flexure

A model for the mechanics of an elastic solid, reinforced with bidirectional fibers is presented in finite plane elastostatics. The fiber’s resistance to stretch and flexure are accounted for with variational computations of first and second gradient of deformations, respectively. Within the framework of strain-gradient elasticity, the Euler equation and necessary boundary conditions are formulated. A rigorous derivation of the corresponding linear theory is also developed from which, a complete analytical solution is obtained for small deformations superposed on large.

mokarram76's picture

Fully funded PhD position in Bio-mechanics, Swansea, UK


research

Hi

We are looking for a good PhD student  in the field of: Bio-mechanics/Computational Engineering/Computational Mecahnics/Material Engineering/Bio-medical EngineeringIt is a fully funded PhD scholarship for UK/EU citizens only.

DrSharmarke's picture

3-Year Postdoctoral Fellow: Green Chemistry/Materials Chemistry

The required postdoctoral fellow will play a leading role in performing research leading to high-impact publications in the broad field of materials chemistry/crystal engineering. The postdoctoral fellow is expected to possess strong experimental research skills and ideally some computational materials modelling experience. The right candidate will spend most of their time in the laboratory where he/she will utilize their strong expertise in synthesis (organic or inorganic compounds) and materials chemistry/characterization in order to develop and validate a novel biosurfactant catalyzed mechanochemical remediation method for the green synthetic functionalization and conversion of persistent organic pollutants. In addition to performing research leading to high-impact publications in peer-reviewed materials chemistry journals, the postdoctoral fellow will work as part of a multidisciplinary team of molecular biologists, bioinformatics experts, chemists and chemical engineers in order to facilitate the deliverables of this exciting project.

cemalbasaran's picture

Unified Mechanics Theory

I thought mechanics community would be interested in my presentation on Unified Mechanics Theory, where I modify Newton's Equations in a succint form to incorporate Thermodynamics into Newtons Laws, which presently they don't have. [is there any proof, ?Yes the new form of the Newton's Laws have been proven experimentally since 1997 and mathematically in 2016}

        F=ma (1- Φ(s))      F=ku (1-(Φ(s))
where Φ(s) is a function of entropy, s, generation rate starts from zero progresses to one.

Shuozhi Xu's picture

Call for Papers: Intrinsic and extrinsic size effects in materials

Dear Colleague:

 

We are delighted to announce that a Focus Issue entitled "Intrinsic and extrinsic size effects in materials" for the Journal of Materials Research (JMR) is now open for submission:

https://www.cambridge.org/core/journals/journal-of-materials-research/in...

Wenbin Yu's picture

ICME Prize

Co-sponsored by cdmHUB, NASA, and Rolls-Royce, the bi-annual AIAA Integrated Computational Materials Engineering (ICME) Prize) is open for submission. The best project will be selected and honored at SciTech conference. To participate, you need to submit a description of your project by June 29, 2018, which will be reviewed by the ICME prize committee. More details can be found at https://www.aiaa.org/icme/. If you are interested in submitting, please let me know. 

Fan Xu's picture

Roll up your sleeves

When you push up your sleeves, wrinkles form, which eventually evolve into ridges (pictured). As familiar as you may be with this phenomenon, have you ever thought about its underlying mechanism? It involves the complex nonlinear mechanical behaviour of large deformations and surface instabilities, which in turn give rise to a sophisticated morphological evolution. And now, Yifan Yang and co-workers have revealed a hitherto unknown post-buckling behaviour that involves multiple bifurcation transitions (Phys. Rev.

A question regarding applying the boundary conditions in thin film peeling

Choose a channel featured in the header of iMechanica: 

Hello all,

As is my understanding that, in analytical models such as "Kendall Peeling Model", when they talk about peeling angle it is the angle at which the peeling force is applied (or am I wrong?). But when it comes to FE analysis, if we displace one end of the film at an angle by applying displacement boundary conditions on that end, the resulting forces are not along the same direction of the displacements. So, I am confused as to how to compare the FE results with that of the analytical models.

Thank you.

mokarram76's picture

Fully funded PhD position in Swansea University, UK

Hi

PhD Scholarship  in the field of: Mechanical Engineering/Computational Engineering/Polymer Sciences/Material Engineering/Material Sciences. It is a fully funded PhD scholarship for UK/EU citizens only.

http://www.swansea.ac.uk/postgraduate/scholarships/research/engineering-...

kamrankhan026's picture

Postdoctoral Position Available at Khalifa University: Composite Manufacturing and Multiscale Modeling

A Postdoctoral Research Fellow position is available immediately in the aerospace department at the Khalifa University of Science and Technology in Abu Dhabi in United Arab Emirates. The research project focuses on Composite materials and manufacturing, Autoclave/out of autoclave techniques, LCM, constitutive and multi-scale computational modeling of the viscoelastic and other inelastic behavior of composites.

kamrankhan026's picture

Postdoctoral Position Available at Khalifa University: Composite Manufacturing and Multiscale Modeling

A Postdoctoral Research Fellow position is available immediately in the aerospace department at the Khalifa University of Science and Technology in Abu Dhabi in United Arab Emirates. The research project focuses on Composite materials and manufacturing, Autoclave/out of autoclave techniques, LCM, constitutive and multi-scale computational modeling of the viscoelastic and other inelastic behavior of composites.

chaofenglu's picture

Modified multiplicative decomposition model for growth: Beyond the initial stress-free state

The multiplicative decomposition model is widely employed for predicting residual stresses and morphologies of biological tissues due to growth. However, it relies on the assumption that the tissue is initially in a stress-free state, which conflicts with the observations that any growth state of a biological tissue is under a significant level of residual stresses that helps to maintain its ideal mechanical conditions.

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