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Torque-dense photomechanical actuation

Submitted by Kaushik Dayal on

This article will appear in Soft Matter (https://doi.org/10.1039/D0SM01352H)

 

Torque-dense photomechanical actuation

Mahnoush Babaei, Junfeng Gao, Arul Clement, Kaushik Dayal and M. Ravi Shankar

Department of Mechanical Engineering, Carnegie Mellon University
Department of Civil and Environmental Engineering, Carnegie Mellon University
Department of Materials Science and Engineering, Carnegie Mellon University
Department of Industrial Engineering, University of Pittsburgh

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Submitted by Bin Wang on

5.1 Elastic stress transfer, in Chapter 5. Composite mechanics: Short fibers, in Load Bearing Fiber Composites, by Michael R. Piggott, 2002

This time reading notes on a section of a well-known mechanics book are presented, due to its extreme clarity and reader-friendliness in explaining the stress transfer in fiber-reinforced composites. Personal understanding for the micromechanical model and derivations are included accordingly without specific indications.

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Submitted by Bin Wang on

Materials become insensitive to flaws at nanoscale: Lessons from nature, Gao, Ji, Jger, Arzt, Fratzl, PNAS, 2003

 

Novelty/impact/significance:

It is firstly/ingeniously demonstrated that the biological nanocomposites’ generic structure is mechanically advantageous: the nanometer size of mineral reinforcements is selected to ensure optimum strength and maximum tolerance of flaws. The derivations are simple and effective.

Scientific question:

EML Webinar by Prof. David Weitz on Dec. 16, 2020: Snap, Speckle and Spot: Sight and Sound of Hydraulic Fracture

Submitted by Teng Li on
research
EML Webinar
EML

EML Webinar on 16 December 2020 will be given by Dave Weitz, Harvard University. Discussion Leader Jia Liu, Harvard University.

Title: Snap, Speckle and Spot: Sight and Sound of Hydraulic Fracture

Time: 6:30 am California, 9:30 am Boston, 2:30 pm London, 10:30 pm Beijing on 16 December 2020

Doctoral student positions in computational geomechanics at UBC, Vancouver

Submitted by mahditaiebat on
job
Doctoral Student Positions
computational geomechanics

We are on the lookout for TWO exceptionally bright and eager Ph.D. students to join our Theoretical & Applied Geomechanics (TAG) research team, to work in the areas of computational geomechanics and geotechnical earthquake engineering. The candidate must hold an M.Sc. degree in geotechnical engineering and must have solid knowledge in applied mechanics and continuum and/or discrete element modeling (computation and/or program development). Consideration will be given to candidates with a proven record of relevant academic background.

Metamaterials with Giant and Tailorable Nonreciprocal Elastic Moduli

Submitted by M. Shaat on
research
mechanical metamaterials
nonreciprocal elasticity

Natural nonlinear materials, e.g., biological materials and polymers, are mechanically weak. It has been amajor challenge to develop a nonlinear material with potentialmechanical applications. Here, we develop a nonlinear elastic metamaterial with giant and tailorable-nonreciprocal elastic moduli. The metamaterial is designed with a microstructural axial asymmetry, which activated nonlinear microstructural deformations in the axial direction and microstructural residual moments.

Review on nonlocal continuum mechanics: Physics, material applicability, and mathematics

Submitted by M. Shaat on
research
Review
Micromorphic Mechanics

The classical continuum mechanics assumes that a material is a composition of an infinite number of particles each of which is a point that can only move and interact with its nearest neighbors. This classical mechanics has limited applications where it fails to describe the discrete structure of the material or to reveal many of the microscopic phenomena, e.g., micro-deformation and micro-dislocation.

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