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Determination of elastic constants for tire cord/rubber composite

YU Qi,DING Jian ping,GU Xue fu,TU Yu qian (South China University of Technology,Guangzhou 510640,China)  
The determination of the elastic constants for cord/rubber composite in FEA of tire was investigated based on the micro and macro mechanical theories.The application of Halpin Tsai formula,Gough Tangorra formula and Akaka Hirano formula in the calculation of the elastic constants of cord/rubber composite (longitudinal elastic modulus E 1,lateral elastic modulus E 2,shear modulus in plane G 12 ,primary Poissons ratio μ 12 and second Poissons ratio μ 21 ) which were simplified as a single ply composite of same nature in lateral direction was described.It was proposed that the charge percentage of the cross sectional area of steel cord could be used to chareacterize the Poissons ratio of steel core μ ,and recommended that the fixed cross section method was used to determine μ .The elasticconstants of different cord/rubber composites could be determined by laser spot scatter method,clou ding method and rail shear method.The phenomenon that μ was greater than 1 was discussed.
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