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emuna's picture

Circumferential instabilities in radially incompatible tubes

The full paper can be found at:

https://authors.elsevier.com/c/1b2plc7qwXwm0

Abstract:

Geometric incompatibilities are ubiquitous in natural structures and are recently being exploited in synthetic

structures to enhance the performance of soft systems. In this work we focus on infinitely long bi-layer

Teng Li's picture

EML Webinar by Prof. Xuanhe Zhao on May 6, 2020

EML Webinar on May 6, 2020 will be given by Prof. Xuanhe Zhao at MIT via Zoom meeting. 

Title: Extreme Mechanics of Soft Materials for Merging Human-Machine Intelligence

Antonio Papangelo's picture

Self-excited vibrations due to viscoelastic interactions

Self-excited vibrations represent a big concern in engineering, particularly in automotive, railway and aeronautic industry. Many lumped models have been proposed over the years to analyze the stability of such systems. Among the instability mechanisms a falling characteristic of the friction law and mode coupling have been shown to give friction-excited oscillations. The mass-on-moving-belt system has been studied extensively in Literature, very often adopting a prescribed form of the friction law and linearizing the contact stiffness.

Parag Tandaiya's picture

Mechanistic origins of work hardening in shape memory alloy particle reinforced ex-situ bulk metallic glass matrix composites

Monolithic Bulk Metallic Glasses (BMGs) exhibit strain softening or elastic-perfectly plastic response under uniaxial loading. However, shape memory alloy particle reinforced BMG matrix composites show strong work hardening in experiments. In our recent paper published in Scripta Materialia, we explain the Mechanistic origins of work hardening in shape memory alloy particle reinforced ex-situ bulk metallic glass matrix composites through three dimensional finite element simulations.

santiago.orrego's picture

Bioinspired Materials with Self‐Adaptable Mechanical Properties

Dear iMechanica,

We are very excited to share the news that our recent work on bioinspired materials with self‐adaptable mechanical properties is published in Advanced Materials.

https://onlinelibrary.wiley.com/doi/abs/10.1002/adma.201906970

The work was done in collaboration with Prof. Kang from Johns Hopkins University

mokarram76's picture

Ecoflex polymer : Comprehensive experimental study and constitutive modelling

We have published two papers on Ecoflex, a popular silicone polymer in recent days. The polymer is largely temperature- and strain rate-insensitive. It comes up with several Shore Hardnesses. We characterize five Shores and develop a novel Shore-dependent modelling framework

Mechanics of Materials >> https://www.sciencedirect.com/science/article/pii/S016766362030020X

vacary's picture

First Overlay Journal in Solid Mechanics is launched. Call for handling editors

Dear members of iMechanica,

We are very pleased to announce the born of the first overlay journal in Solid Mechanics the so-called

 Journal of Theoretical, Computational and Applied Mechanics https://jtcam.episciences.org

which is a scholarly journal, provided on a Fair Open Access basis, without cost to both readers and authors. The Journal aims to select publications of the highest scientific caliber in the form of either original research or review in Solid Mechanics. 

Machine Learning for Fracture Mechanics

Safer batteries, more efficient gas-turbine engines and solar cells, all require better-engineered nanocomposite materials. There is a limitation though -- how to investigate the fracture mechanics of these materials? Machine learning can help us overcome this limitation.

Mohammadreza_Aali's picture

Investigation of Spindle Rotation Rate Effects on the Mechanical Behavior of Friction Stir Welded Ti 4Al 2V Alloy

Nowadays, titanium and its alloys are widely utilized in various industrial parts in such areas as the petrochemical, medical, and automotive industries; However, due to structural considerations, the application is problematic in cases of joining. Ti 4Al 2V is a new type of titanium alloy, that in point of the structure is near to the α-series, which have many applications in critical conditions (moisture, steam, temperature, etc.).

danialfaghihi's picture

A phase-field mixture theory of tumor growth

Our paper on the phase-field mixture theory of tumor growth is published in JMPS. The continuum model simulates significant mechano-chemo-biological features of avascular tumor growth in the various microenvironment, i.e., nutrient concentration and mechanical stress.

Faghihi, Feng, Lima, Oden, and Yankeelov (2020). A Coupled Mass Transport and Deformation Theory of Multi-constituent Tumor Growth. Journal of the Mechanics and Physics of Solids, 103936.

sairajatm's picture

A unification of finite deformation J2 Von-Mises plasticity and quantitative dislocation mechanics

Rajat Arora       Amit Acharya

We present a framework which unifies classical phenomenological J2 and crystal plasticity theories with quantitative dislocation mechanics. The theory allows the computation of stress fields of arbitrary dislocation distributions and, coupled with minimally modified classical (J2 and crystal plasticity) models for the plastic strain rate of statistical dislocations, results in a versatile model of finite deformation mesoscale plasticity. We demonstrate some capabilities of the framework by solving two outstanding challenge problems in mesoscale plasticity: 1) recover the experimentally observed power-law scaling of stress-strain behavior in constrained simple shear of thin metallic films inferred from micropillar experiments which all strain gradient plasticity models overestimate and fail to predict; 2) predict the finite deformation stress and energy density fields of a sequence of dislocation distributions representing a progressively dense dislocation wall in a finite body, as might arise in the process of polygonization when viewed macroscopically, with one consequence being the demonstration of the inapplicability of current mathematical results based on $\Gamma$-convergence for this physically relevant situation. Our calculations in this case expose a possible 'phase transition'-like behavior for further theoretical study. We also provide a quantitative solution to the fundamental question of the volume change induced by dislocations in a finite deformation theory, as well as show the massive non-uniqueness in the solution for the (inverse) deformation map of a body inherent in a model of finite strain dislocation mechanics, when approached as a problem in classical finite elasticity.

Paper can be found at link Finite_Deformation_Dislocation_Mechanics.

 

 

 

Lixiang Yang's picture

Theoretical and Numerical Analysis of Anterior Cruciate Ligament Injury and its Prevention

Theory of physical aging from polymer science is, for the first time, introduced to understand ACL injury and its prevention. By analogy to physical aging of amorphous polymer materials, we think physical aging of two bundles of ACL will largely increase risk of ACL injury. Besides, physical aging will also build a heterogeneous stress and strain in ACL due to its natural anatomic structure, which is a large risk for athletes. The specific designed prevention programs for ACL injury such as plyometrics, strengthening and other neuromuscular training exercises [1] are believed to erase physical aging of ACL. ACL with less physical aging is less likely to get injured in sport activities. In this article, a virtual physical aging simulation is built to validate current hypothesis. Erasing physical aging of ACL may provide an accurate and quantitative way to prevent ACL injury.

Two-dimensional finite element analysis of elastic adhesive contact of a rough surface

Adhesive contact of a rigid flat surface with an elastic substrate having Weierstrass surface profile is numerically analyzed using the finite element method. In this work, we investigate the relationship between load and contact area spanning the limits of non-adhesive normal contact to adhesive contact for various substrate material properties, surface energy and roughness parameters. In the limit of non-adhesive normal contact, our results are consistent with published work.

yuzhen's picture

Blueprinting Photothermal Shape‐Morphing of Liquid Crystal Elastomers

By Alexa S. Kuenstler, Yuzhen Chen, Phuong Bui, Hyunki Kim, Antonio DeSimone, Lihua Jin, Ryan C. Hayward

Nuwan Dewapriya's picture

Characterizing fracture stress of defective graphene samples using shallow and deep artificial neural networks

Abstract: Advanced machine learning methods could be useful to obtain novel insights into some challenging nanomechanical problems. In this work, we employed artificial neural networks to predict the fracture stress of defective graphene samples. First, shallow neural networks were used to predict the fracture stress, which depends on the temperature, vacancy concentration, strain rate, and loading direction.

Arash_Yavari's picture

Nonlinear Mechanics of Thermoelastic Accretion

In this paper, we formulate a theory for the coupling of accretion mechanics and thermoelasticity. We present an analytical formulation of the thermoelastic accretion of an infinite cylinder and of a two-dimensional block.

Pradeep Sharma's picture

Freely Downloadable Special Issue of Journal of Applied Mechanics/Century of Fracture Mechanics/John W. Hutchinson's 80th Birthday

Fracture mechanics is one of the key research topics in our field (of mechanics) and has a rather rich history of innovation and applications. From earth-quakes to air-planes---the mechanics underpinning the phenomenon of materials falling apart has been essential in the development of technology.  Griffith’s work on fracture was published about a 100 years ago and is often widely regarded as the start of modern fracture mechanics.

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