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rupture of Cu films

Submitted by Rongmei niu on
research
Plasticity

Dear Prof. Li, i have made two figures about rupture strains of  films on elastomer according to the datas shown in your papers-- "Deformability of thin metal films on elastomer substrates" International Journal of Solids and Structures 43 (2006) 2351–2363. and "Stretchability of thin metal films on elastomer substrates" APL85(2004). According to the papers, the stiffer or thicker the elastomer substrates, the larger rupture strains, then where would be the curve with H/h =200? Whether the rupture strain is even large, according to your simulations?

Solution of system of Differential equations

Submitted by Sandip Haldar on
research
System of Differential Equation

Dear Wei and Mogadalai,

As mentioned earlier I am trying to solve for a vector {x} from

{x'}=[A(t)]{x}

where [A(t)] is known matrix of size (2X2) at the max 4x4, elements and are functions of "t".

{x} is a vector (nX1) function of 't'

{x'} is derivative of {x} with respect to 't'.

Analytical derivation on the stress of the adhesive layer based on beam/plate therories?

Submitted by Mingji Wang on
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Integrated Structures Forum
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I just came across the lecture notes from Professor Nix on Mechanical Properties of Thin Films. It is very educative and helpful. I wonder if anyone could recommend some analytical derivation on the stress of the adhesive layer between two similar/dissimilar adherends (sandwiched specimen) under mechanical or thermal loading.

Many thanks ...

Phase field simulations of polarization switching-induced toughening in ferroelectric ceramics

Submitted by Jie Wang on
research
Tong-Yi Zhang
Phase field simulations
polarization switching-induced toughening
ferroelectric ceramics

Polarization switching-induced shielding or anti-shielding of an electrically permeable crack in a mono-domain ferroelectric material with the original polarization direction perpendicular to the crack is simulated by a phase field model based on the time-dependent Ginzburg-Landau equation. The domain wall energy and the long-range mechanical and electrical interactions between polarizations are taken into account. The phase field simulations exhibit a wing-shape- switched zone backwards the crack tip.

"Wrinkled hard skins on polymers created by Focused Ion Beam", PNAS , January 2007

Submitted by Ashkan Vaziri on
research

A stiff skin forms on surface areas of a flat polydimethylsiloxane (PDMS) upon exposure to focused ion beam (FIB) leading to ordered surface wrinkles. By controlling the FIB fluence and area of exposure of the PDMS, one can create a variety of patterns in the wavelengths in the micrometer to submicrometer range, from simple one-dimensional wrinkles to peculiar and complex hierarchical nested wrinkles. Examination of the chemical composition of the exposed PDMS reveals that the stiff skin resembles amorphous silica. Moreover, upon formation, the stiff skin tends to expand in the direction perpendicular to the direction of ion beam irradiation. The consequent mismatch strain between the stiff skin and the PDMS substrate buckles the skin, forming the wrinkle patterns. The induced strains in the stiff skin are estimated by measuring the surface length in the buckled state. Estimates of the thickness and stiffness of the stiffened surface layer are estimated by using the theory for buckled films on compliant substrates. The method provides an effective and inexpensive technique to create wrinkled hard skin patterns on surfaces of polymers for various applications. Click here for access to the full article. See also the press release: Applied scientists create wrinkled 'skin' on polymers

Call for papers: Mahalanobis-Taguchi System Analysis

Submitted by Roddy MacLeod on
research
call for papers

Call for papers: Mahalanobis-Taguchi System Analysis.  A special issue of the International Journal of Industrial and Systems Engineering (IJISE).

With rapid advances in technology, use of automated data collection methods is on a steep rise. Situations that call for decision-making with voluminous datasets involving several variables are being encountered in an ever-increasing number of fields. Mahalanobis-Taguchi System (MTS) analysis provides an effective decision-making methodology in such situations. It is being successfully used by engineers in companies such as Nissan, Ford, Delphi, Xerox, and Yamaha, to name but a few.  This special issue invites submission of papers that could be state-of-the-art, new contributions, technical notes, review papers, or case studies in the area of Mahalanobis-Taguchi System analysis. For more information, please see the Journal Call for Papers website.

International Journal for Computational Vision and Biomechanics

Submitted by tavares on
research
biomechanics
computational mechanics

International Journal for Computation Vision and Biomechanics - Announcement and First Call for papers

ISSN: 0973-6778

Subject: Computational Vision and Biomechanics

Frequency: 2 issues per year

Start date: First trimester of 2007

Dear Colleague,

It is a pleasure to announce the new International Journal for Computation Vision and Biomechanics (IJCV&B) and its first call for papers.

Lift weight using less energy

Submitted by Jigar Y. Patel on
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Experimental Mechanics Forum
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As shown in figure(energyefficiency1.jpg) sliding plates can slide over fixed plates. Stationary plate is simply supported horizontaly on sliding plates. Lubrication is provided at contact surfaces of stationary plate and sliding plates. Weight or load or force (mg) is applied at center of stationary plate. This load is equally devided and applied on each sliding plate in vertical downward direction (mg/2). This mg/2 cos(alpha) helps  sliding plate to slide in nearly downward direction.

Rotate pulleys using less energy

Submitted by Jigar Y. Patel on
research

As shown in figure (energyefficiency1.jpg) sliding plates can slide over fixed plates. Stationary plate is simply supported horizontaly on sliding plates. Lubrication is provided at contact surfaces of stationary plate and sliding plates. Weight or load or force (mg) is applied at center of stationary plate. This load is equally devided and applied on each sliding plate in vertical downward direction (mg/2). This mg/2 cos(alpha) helps sliding plate to slide in nearly downward direction.

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