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elastomer

wvmars's picture

Engineering Analyst position with focus on FEA, elastomers, and fatigue life prediction

Endurica, LLC is a growing software and consulting services company headquartered in Findlay, Ohio, USA. The
company develops and sells solutions that enable customers to manage durability of elastomeric products. Our
physics-based solutions include computer-aided engineering software that numerically simulates the fatigue life
of elastomeric products, a materials characterization service, and project-oriented consulting services. Our
software is distributed globally in partnership with Dassault Systemes.

Compression buckling of polymeric beam/column

Hello,

I have a problem with a stacked colum of elastomeric membranes (natural rubber or silicone).

I am looking for a compression buckling criterion that applies for hyperelastic materials in presence of large deformations (up to 400%).

I've read about Haringx formula, that should apply for these materials, but I suspect that it is valid for small strains only.

My question is:

- is there a suitable buckling criterion for this case?

Zhigang Suo's picture

Elasticity of rubber-like materials

In the notes on the general theory of finite deformation, we have left the free energy function unspecified. The notes here describe free energy function commonly used to describe the elasticity of rubber-like materials.  These notes are part of a course on advanced elasticity

wvmars's picture

Seeking Engineering Analyst with ABAQUS Experience

Endurica LLC (www.endurica.com) is a growing, high-technology, small business startup with customers in the defense, heavy equipment, offshore, and automotive sectors. We deliver world-leading solutions and services for managing elastomer durability issues at the conceptual / CAE stage. We are located in Findlay, Ohio.

wvmars's picture

Call for Papers - Rubber Division ACS mini-symposium on Mechanics and Modelling, Cincinatti, 9-11 Oct 2012


The Rubber Division, ACS is now accepting online
abstract submissions for the 182nd Technical Meeting being held during the
Rubber Expo at the Duke Energy Center, October 9-11, 2012, in Cincinnati, OH,
USA. 
Papers will be judged and awards presented
for Best Paper and Best Paper - Honorable Mention.


wvmars's picture

Hyperelastic material characterization: why they call it the pure shear specimen

Many people puzzle over the nomenclature of the pure shear test. They rightly point out that 1) the Pure Shear test piece is loaded in tension by extending the specimen in the axial direction, and 2) a shearing deformation, by definition, involves the lateral motion of parallel planes. They wonder where is the "shear"? and what does it mean to say that the shear is "pure"?  Here, we review the origins of the terminology. 

ErwanVerron's picture

European Conference on Constitutive Models for Rubber - ECCMR 7

The 7th European Conference on Constitutive Models for Rubber will take place in the Dublin Institute of Technology (DIT), Dublin, Ireland, 20-23 September 2011.

 

Deadline for abstract submission: the 5th of December 2010

Website: http://www.eventelephant.com/eccmr2011dublin

 

Regards,

   Erwan 

wvmars's picture

European Conference on Constitutive Models for Rubber - ECCMR VI

ECCMR 2009 - Sixth European Conference on Constitutive Models for Rubber

Held at TU Dresden, Germany, September 7-10, 2009. 

www.eccmr.org

LECAM's picture

Cyclic volume changes in rubber

This is a study dealing with the volume variation in filled crystallizable natural (F-NR) and uncrystallizable styrene butadiene (F-SBR) rubbers subjected to cyclic loadings. During their deformation, such materials exhibit volume variation induced by the cavitation phenomenon and the decohesion between particles and the rubber matrix.

LECAM's picture

Volume variation in filled and unfilled natural rubber : competition between cavitation and stress-induced crystallization

this is a study on the competition between cavitation and stress-induced crystallization during the deformation of cis-1,4 polyisoprene rubber. During deformation, this kind of material exhibits volume variation induced by both phenomena. In this study, we propose to measure this volume variation by an original full-field measurement technique. The high resolution of this technique allows us to identify characteristic stretch ratios during mechanical cycles.

Zhigang Suo's picture

Mechanics of Soft Active Materials

At the invitation of David Clarke on behalf of the UCSB/Los Alamos Institute of Multiscale Materials and Structures, I gave the following three lectures:

  1. Large deformation and instability in dielectric elastomers
  2. Large deformation and instability in swelling polymeric gels
  3. Mechanics and electrochemistry of polyelectrolyte gels

The abstracts follow, and the slides are attached at the end of this post.

Zhigang Suo's picture

Large deformation and instability in gels

I'm attaching slides of a talk that I gave yesterday at the Schlumberger-Doll Research Center.  In preparing the talk, I made liberal use of slides prepared by Wei Hong for his own presentations.  The talk is mainly based on the following papers:

Xuanhe Zhao's picture

A method to analyze electromechanical stability of dielectric elastomer actuators

      This letter describes a method to analyze electromechanical stability of dielectric elastomer actuators.  We write the free energy of an actuator using stretches and nominal electric displacement as generalized coordinates, and pre-stresses and voltage as control parameters.  When the Hessian of the free-energy function ceases to be positive-definite, the actuator thins down drastically, often resulting in electrical breakdown.  Our calculation shows that stability of the actuator is markedly enhanced by pre-stresses.

Xuanhe Zhao's picture

Electromechanical hysteresis and coexistent states in dielectric elastomers

Active polymers are being developed to mimic a salient feature of life: movement in response to stimuli. Large deformation can lead to intriguing phenomena; for example, recent experiments have shown that a voltage can deform a layer of a dielectric elastomer into two coexistent states, one being flat and the other wrinkled. This observation, as well as the needs to analyze large deformation under diverse stimuli, has led us to reexamine the theory of electromechanics.

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