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Ramathasan Thevamaran's picture

Synergistic strength and toughness through impact-induced nanostructural evolutions in metals

Dear Colleagues,

I invite you to read our recent paper on the process-structure-property relations in heterogeneous nanostructured metals created through a laser induced projectile impact of single crystal microcubes published in the Extreme Mechanics Lettershttps://doi.org/10.1016/j.eml.2023.102037

Abstract

Constitutive theory for gels by considering molecular frictions

By directly considering molecular frictions induced on polymer chains, we have developed a nonaffine constitutive theory for large stretch behaviors of gels.

https://pubs.rsc.org/en/content/articlelanding/2023/sm/d2sm01340a#!#

 

Cemal Basaran's picture

Prof. Zdenek Bazant Plenary Lecture at ICDM 4 in Baton Rouge

Prof. Zdenek Bazant (Northwestern University, USA) sent me a copy of the plenary lecture he delivered at Int. Conf. on Damage Mechanics 4 at LSU on May 15, 2023, to be posted. The lecture is about a critique of the theoretical inconsistencies in the Phase Field and Peridynamics techniques. Remarkably interesting talk that will create a significant discussion about the validity of these methods..

 

Zdeněk P. Bažant Medal

The Zdeněk P. Bažant Medal was established in 2022 by the Applied Mechanics Division and recognizes an individual who has made significant contributions to the field of mechanics through research, practice, teaching and/or outstanding leadership. For details, please go to: Zdeněk P. Bažant Medal

arash_yavari's picture

Universal Displacements in Inextensible Fiber-Reinforced Linear Elastic Solids

For a given class of materials, universal displacements are those displacements that can be maintained for any member of the class by applying only boundary tractions. In this paper we study universal displacements in compressible anisotropic linear elastic solids reinforced by a family of inextensible fibers. For each symmetry class and for a uniform distribution of straight fibers respecting the corresponding symmetry we characterize the respective universal displacements. A goal of this paper is to investigate how an internal constraint affects the set of universal displacements.

Article: Interaction of two cylinders immersed in a viscous fluid. On the effect of moderate Keulegan–Carpenter numbers on the fluid forces

This work deals with the hydrodynamic interaction of two parallel circular cylinders, with identical radii, immersed in a viscous fluid initially at rest. One cylinder is stationary while the other one is imposed a harmonic motion with a moderate amplitude of vibration. The direction of motion is parallel to the line joining the centers of the two cylinders. The two dimensional fluid–structure problem is numerically solved by the Arbitrary Lagrangian–Eulerian method implemented in the open-source CFD code TrioCFD.

A new method of plastic limit analysis for rectangular plates

Based on a new element model of solid body, the plastic limit analysis of plate is carried out. The new element model is a truss composed of 24 bars. Taking the simply supported square plate and rectangular plate under uniform load as an example, by comparing the new element method with the classical plastic limit analysis theory, it can be found that the limit load and the distribution of plastic zone obtained by the two methods are in good agreement.

A new model for elasto-plastic analysis of steel

This is a beautiful, unparalleled elastoplastic model for plastic materials.

Based on the equivalent stress and deformation of regular hexahedron microelement and truss element, a new truss element model is presented. It can be used to solve the elasto-plastic plane stress problem and spatial problem of steel. Through a large number of examples, the new element model can be found to have good accuracy.

A new method of plastic limit analysis for beams and frames

The plastic limit of beams and frames have analyzed by using a new truss element model of solid bodies, compared with the plastic limit analysis method, it can be found that the limit load of the two methods are in good agreement.

Supplemental Videos:

(1) https://www.bilibili.com/video/BV1Yt4y1A7a1/?spm_id_from=333.999.0.0

(2) https://www.bilibili.com/video/BV1vg411U7Dv/?spm_id_from=333.999.0.0

SwarnavaGhosh's picture

Order Parameter Engineering for Random Systems

"Order Parameter Engineering for Random Systems" published in High Entropy Alloys and Materials

Abstract:

xingshengsun's picture

Postdoctoral and PhD positions at Tsinghua Shenzhen International Graduate School

Two postdoctoral researcher positions and one Ph.D. position are available in the Multiphase Fluid-Structure Interaction Lab in Tsinghua Shenzhen International Graduate School. The postdoc will assist the PI (Prof. Shunxiang Cao) in tasks associated with the high-performance simulations of multiphase fluid-structure interaction (FSI) problems, including bubbly flow modeling, development of efficient fluid-structure coupling algorithms, development of high-performance fluid-structure coupled solver, and reinforcement-learning-based control of FSI. 

Synergism effect between nanofibrillation and interface tuning on the stiffness-toughness balance of rubber-toughened polymer nanocomposites: a multiscale analysis

In our recent study published in ACS Applied Materials & Interfaces, using a multiscale modeling technique, we investigated how the combination of nanofibrillation and interfacial tuning can have a synergistic effect on the stiffness-toughness balance in rubber-toughened nanocomposites. Check out the link below:

https://pubs.acs.org/doi/full/10.1021/acsami.3c04017

arash_yavari's picture

A Geometric Field Theory of Dislocation Mechanics

In this paper a geometric field theory of dislocation dynamics and finite plasticity in single crystals is formulated. Starting from the multiplicative decomposition of the deformation gradient into elastic and plastic parts, we use Cartan's moving frames to describe the distorted lattice structure via differential 1-forms. In this theory the primary fields are the dislocation fields, defined as a collection of differential 2-forms. The defect content of the lattice structure is then determined by the superposition of the dislocation fields.

mohsenzaeem's picture

Atomistic-informed kinetic phase-field modeling of non-equilibrium crystal growth during rapid solidification

I am happy to share with you our recent paper on kinetic phase-field modeling of non-equilibrium crystal growth, which is just published in Acta Materialia, it is open access:

S. Kavousi, V. Ankudinov, P. K. Galenko, M. Asle Zaeem. Atomistic-informed kinetic phase-field modeling of non-equilibrium crystal growth during rapid solidification. Acta Materialia 253 (2023) 118960 (11 pages).

Oscar Lopez-Pamies's picture

Journal Club for May 2023: Strength Revisited: One of Three Basic Ingredients Needed for a Complete Macroscopic Theory of Fracture

1. Introduction

Because of its overwhelming pervasiveness and high-stakes impact on the mechanical performance of structures made of inorganic and live matter alike (bridges, airplanes, bones, ligaments,...), fracture has attracted the attention of humans, researchers and laymen the same, for centuries.

arash_yavari's picture

Optimal Elastostatic Cloaks

An elastic cloak hides a hole (or an inhomogeneity) from elastic fields. In this paper, a formulation of the optimal design of elastic cloaks based on the adjoint state method, in which the balance of linear momentum is enforced as a constraint, is presented. The design parameters are the elastic moduli of the cloak, and the objective function is a measure of the distance between the solutions in the physical and in the virtual bodies. Both the elastic medium and the cloak are assumed to be made of isotropic linear elastic materials.

mohsenzaeem's picture

Mechanisms of nucleation and defect growth in undercooled melt containing oxide clusters

Dear iMechanica colleagues; I am happy to share with you our recent paper that is just published in Acta Materialia, it is open access:

S. Kavousi and M. Asle Zaeem. Mechanisms of nucleation and defect growth in undercooled melt containing oxide clusters. Acta Materialia 252 (2023) 118942 (12 pages).

Cutting a material

what are the main material properties a substrate should have if you want to be able to cut through it nicely and have a clean cut? I know a little bit about cutting tools but not much about the substrate?

yanhang's picture

Post-Doctoral Position in Biomechanics, Boston University

A postdoctoral research position is available in Dr. Katherine Yanhang Zhang’s Multi-Scale Tissue Biomechanics Lab in the Mechanical Engineering Department at Boston University.

tarkes's picture

Commercial Tools on Digital Photoelasticity Developed in an Academic Environment

Dear Colleagues,

I would like to draw your attention as well as share an excellent standing-out example of an outcome of decades of focused academic research as commercial software which finds usage in several industries such as biomedical, electrical, aerospace, civil, mechanical, manufacturing, biological, and agriculture.

USNC/TAM Distinguished Lecture by John Rogers and 2022 Newsletter

Dear member,

I am delighted to extend an invitation to attend the next US National Committee of Theoretical and Applied Mechanics (USNC/TAM) Distinguished Lecture to be delivered by Professor John Rogers of Northwestern University. The event will take place in-person, at the National Academies in Washington DC, and online (Zoom Live Stream) on May 5th, 2023, 5-6 PM ET. A flyer with detailed information and a link for registration is enclosed.

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