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verron's picture

Journal Club Theme of Nov. 1 2008: Mechanical behaviour of rubber-like materials

Submitted by verron on Wed, 2008-10-29 21:20.

Rubber-like material is the generic term to define quasi-linear solid polymers. It encompasses elastomers (natural such as Natural Rubber (NR), and synthetic such as Styrene Butadiene Rubber (SBR), but also other large strain elastic materials such as heat-softened thermoplastics (especially for blow-molding simulation) , but also for biological materials such as muscles, tendons, blood vessel (see for example this book).

The key point to understand their behaviour is the nature of elasticity involved in these materials: the elasticity is mainly entropic. Then it is classically referred to as “Entropic elasticity” and “Rubber elasticity ” and the constitutive equations are derived from the general framework of large strain hyperelasticity (usually these materials are considered homogeneous, isotropic, incompressible and elastic). Nevertheless, the mechanical response of these materials and especially Natural Rubber is highly more complicated: they exhibit stress-softening, long-term viscoelasticity, initial or induced anisotropy, hysteresis, volume change, ...


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Biswajit Banerjee's picture

What is the Shore A hardness used for?

Submitted by Biswajit Banerjee on Thu, 2008-07-31 05:37.

The Shore A and D hardness tests are widely used by the rubber industry.  However, I'm not sure what practical use these numbers can be put to during design.  My current feeling is that Shore hardness numbers can at best give you a feel for the texture of the rubber - a Shore A value of 5 = gummy bear texture, Shore A = 40 implies erasure texture etc.

Can someone explain how Shore hardness values can be used in the design of mechanical components made of rubber?

Thanks in advance,

Biswajit 


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verron's picture

Comparison of hyperelastic models for rubberlike materials

Submitted by verron on Sun, 2007-09-09 07:08.

Dear all,

Infinity asked me for posting more information about one of our papers. It was published in 2006 in Rubber Chemistry and Technology and proposes a comparison and a ranking of 20 different hyperelastic constitutive models for rubber (from the Mooney model (1940) to the micro-sphere model (2004)) in the incompressible case.

Marckmann G. et Verron E., Comparison of hyperelastic models for rubberlike materials, Rubber Chemistry and Technology, 79(5), 835-858, 2006.


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verron's picture

Recent papers on rubber mechanics

Submitted by verron on Thu, 2007-07-19 09:40.

Here are some of my recent papers about mechanics of rubber material. They concern constitutive modelling, fatigue and fracture.


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