Abstract - Vulcanised rubber characterisation for finite element analysis


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	Publications of MRB Latest Publications MRB Digest Journal of Rubber Research 3^rd Qtr 2008 Vol 11(3) 2^nd Qtr 2008 Vol 11(2) 1^st Qtr 2008 Vol 11(1) 4^th Qtr 2007 Vol 10(4) 3^rd Qtr 2007 Vol 10(3) 2^nd Qtr 2007 Vol 10(2) 1^st Qtr 2007 Vol 10(1) 1^st Qtr 2006 Vol 9(1) 2^nd Qtr 2006 Vol 9(2) 3^rd Qtr 2006 Vol 9(3) 4^th Qtr 2006 Vol 9(4) Submit paper/article Order Form	Abstract Vulcanised Rubber Characterisation for Finite Element Analysis A Hyperelastic material model of vulcanised rubber compounds, defined as a strain energy function, is used to describe its mechanical behaviour. The relation of strain energy function to stress, following the study of Yeoh, was employed. The simplest relation of the reduced true stress for uniaxial tension or uniaxial compression (s^t_r) and for simple shear (t_r) is used as the following cubic function in (I₁-3); s^t_rort_r= 2C₁₀ + 4C₂₀ (I₁- 3) + 6C₃₀(I₁ - 3)² where I1, is the first invariant and C10, C20 and C30 are constants, which are determined from those simple tests. Three vulcanised SBR compounds and one vulcanised NR compound were examined on those three simple deformation modes. An agreement of the experimental stress-strain relation to finite element analysis, using COSMOS/M was found for the four compounds tested in compression and simple shear modes. This agreement was also confirmed with other three NR compounds, tested in compression and simple shear modes. However, discrepancy was clearly observed in the case of high carbon-black loaded SBR compounds tested in tension mode.
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