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Stress-strain behavior of segmented polyurethaneureas under pure shear deformation |
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| Authors: | Toshikazu Takigawa Satoshi Yamasaki Kenji Urayama Masaoki Takahashi Toshiro Masuda |
| Institution: | (1) Division of Material Chemistry, Kyoto University, Yoshida, Sakyo-ku, 606-01 Kyoto, Japan;(2) Nagoya Laboratory, Mitsui Toatsu Chemicals, Co., Minami-ku, 457 Nagoya, Japan;(3) Institute for Chemical Research, Kyoto University, Uji, 611 Kyoto, Japan;(4) Department of Polymer Science and Engineering, Kyoto Institute of Technology, Sakyo-ku, 606 Kyoto, Japan |
| Abstract: | Elastic properties of segmented polyurethaneureas (SPUs) under pure shear deformation were investigated. Data were analyzed by using strain energy density function (W). The values of the derivatives of W with respect to the invariants of the strain tensor (I
i
; i = 1, 2, 3 ) at zero strain limit were also estimated theoretically and were compared with those estimated by experiment. The limiting value of the derivative with respect to I
1 ( W/I
1) was shown theoretically to be 5 G/8, while the derivatives with respect to I
2 and I
3 (W/I
2 and W/I
3 were respectively-G/8 and -3G/8. The theoretical prediction could explain the asymptotic behavior of the derivatives of SPUs as well as isoprene rubber (IR) reported by Kawabata et al. at small I
1 limit. |
| Keywords: | Segmented polyurethane elasticity shear strain energy density function Poisson's ratio |
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