Can anyone guide me how to get crosshead speed range equal to or greater than 1:3000 in a motorized electromechanical material testing machine? The load capacity should remain same even at lowest speed.

Hi everybody,

I have a question about the shear modulus of polymers. As we know, the general engineering polymers （rubbers） are highly extensible and elastic. The shear modulus，G， for the polymers subjected to the small-strain conditions, can be defined by G=NkT, where N is the number of network chains, k is Boltzmann's constant and T is temperature in Kelvins.

Huang et al, Science 330, 1515-1520 (2010) (download pdf , or online version);Read a perspective written by Prof. Yet-Ming Chiang, Science 330, 1485 (2010);

School of Engineering and Computing Sciences, Durham University, UK.  We have four posts available in high performance computing applied to computational science and engineering (two lectureships, one readership and one chair). CLOSING DATE January 7th 2011.

Search on www.jobs.ac.uk or the Durham University Vacancies website

Charles Augarde

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Hi my friends,

i am using Dracker Prager Plasticity model in abaqus 6.6, i am working on rock sample, this rock sample shows strain softening behavior not strain hardening, but you know that Drucker Prager can simulate both hardening and softening.

i have the stress-srain diagram from the laboratory test. 

 my shear criterion is linear, i choosed from Suboption   Drucker Prager Hardening.