research

Case Studies in Engineering are a series of open access journals, which publish practical outcome of research and indusrty projects in a variety of Engineering disciplines, including: Construction Materials, Fire Safety, Structural Engineering, Engineering Failure Analysis, Mechanical Systems and Signal Processing, Nondestructive Testing Evaluation and Thermal Engineering.

Piezoelectric vibration damping using resonant shunt circuits: an exact solution

Submitted by Payam Soltani on Tue, 10/28/2014 - 08:30

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piezoelectric; dynamic absorbers; shunting; Equal peak method

Piezoelectric vibration damping using resonant shunt circuits: an exact solution

By :

Payam Soltani, Gaetan Kerschen, Gilles Tondreau and Arnaud Deraemaeker

Abstract

determination of stiffness matrix of transversely isotropic material

Submitted by yzhou on Sun, 10/26/2014 - 05:20

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transversely isotropic material

Dear all, I am an applied mathematician and I have been stucked by the this general question for a while, i.e., to determine the stiffness matrix of transversely isotropic material from known strain and stress tensors. The definition of transversely isotropic tells us that the stiffness matrix can be defined by 5 constants, see attached figure. C₄₄is easy to determine, so we can focus on the remaining 4 constants. I attempted to establish 4 linear equations for these 4 constants with the known strain and stress components.

The role of substrate pre-stretch in post-wrinkling bifurcations

Submitted by Lihua Jin on Sat, 10/25/2014 - 16:12

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mechanical instability

Anesia Auguste, Lihua Jin, Zhigang Suo, Ryan C. Hayward. The role of substrate pre-stretch on post-wrinkling bifurcations. Soft Matter 10, 6520-6529(2014).

Ridge localizations and networks in thin films compressed by incremental release of large equi-biaxial substrate pre-stretch

Submitted by Lihua Jin on Sat, 10/25/2014 - 16:04

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mechanical instability

Atsushi Takei, Lihua Jin, John W Hutchinson, Hiroyuki Fujita, Ridge localizations and networks in thin films compressed by incremental release of large equi-biaxial substrate pre-stretch, Advanced Materials, 2014, 26 (24): 4061-4067.

Part II of Professor Christensen's paper on failure mechanics is published in JAM

Submitted by Yonggang Huang on Thu, 10/23/2014 - 14:15

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Failure Mechanics—Part II: The Central and Decisive Role

of Graphene in Defining the Elastic and Failure Properties

for all Isotropic Materials

Continuing from Part I (Christensen, 2014, “Failure Mechanics—Part I: The Coordination

Between Elasticity Theory and Failure Theory for all Isotropic Materials,” ASME J.

Appl. Mech., 81(8), p. 081001), the relationship between elastic energy and failure specification

is further developed. Part I established the coordination of failure theory with

Multiple PhD/Postdoc Positions/Spring 2015

Submitted by skumaar on Mon, 10/20/2014 - 10:58

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Barrier and protective Coatings

Advanced Materials and Multifunctional Structures (AMMS) Group at Masdar Institute (MI) is seeking suitably qualified candidates for PhD/Postdoctoral positions. Please see attached document for details

Extinct Kangaroos Couldn't Hop

Submitted by Lee Margetts on Thu, 10/16/2014 - 11:16

rigid body kinematics

Another couple of interesting articles to share. Using some "mechanics" principles, researchers have reasoned that 100,000 years ago, kangaroos were too heavy to hop.

A while ago, a different group of researchers published the results of computer modelling (using genetic algorithms) that showed dinosaurs might have hopped and skipped as forms of locomotion! (But only if particularly happy?)

These articles might be good to share with undergraduate engineers for discussion in tutorials. There are issues to discuss with assumptions in both cases.