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Fig.3 The FEM model For there are material nonlinearity, geometric nonlinearity and boundary conditions' nonlinear ,it has made some following settings:the dies are deemed as rigid body,and the shafts are deemed as plastic body,choose steel of 42CrMo2 as material,and the frictions between shafts and the dies are shear frictions,the temperature of the rolling is set as 1050°.
Acknowledgement The project was supported by following funds: the National Natural Science Foundation of China (Grant No.51475247) .
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[4] ZHANG Jing，SHU Xue-dao，HU Zheng-huan.Process parameters on multi-wedge rolling interface quality[J].Journal of Mechanical Engineering，2008，44（11）：209-214
[6] HU Bin,SHU Xue-dao.On End Quality for Roll-cutting Billet without Stub Bar in CWR[J].Journal of ningbo university，2014，27[3]:103-107 [7] Jiang Yang，WANG Baoyu，HU Zheng-huan，YANG Cui-ping.Technological parameters on the ovality of hollow shafts in CWR[J].Journal of Plasticity Engineering，2012,19（1）：21-24.

Duan Z P, of Institute of Mechanics, Chinese Academy of Sciences, for the helpful discussions.
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All kinds of complex solid and fluid models were widely used to describe rheological properties of the material such as the asphaltic sand [7-9], asphalt mixtures [10] and rock [11] in recent years, but the researches were relatively rare on using to describe the rheological characteristics of the solid propellant materials.
Materials and Methods The double-base propellant main raw materials include: Nitrocellulose (NC, 56%), Nitroglycerin (NG, 26.7%),Dinitrotoluene(DNT,11.3%),the others (6%).Test specimens were taken from the double-base propellant grain.
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This testing begins with the preparation of equipment and base materials.
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