Research Papers

A Thermovisco-Hyperelastic Constitutive Model of NEPE Propellant Over a Large Range of Strain Rates

[+] Author and Article Information
Junfa Zhang

Beijing Institute of Space Long March Vehicle,
Branch 76, Mail Box 9200,
Beijing 100070, China
e-mail: junfa20070905@126.com

Jian Zheng

Nanjing University of Science and Technology,
200 Xiaolingwei Street,
Nanjing 210094, China
e-mail: zhengjian_hello@163.com

Xiong Chen

Nanjing University of Science and Technology,
200 Xiaolingwei Street,
Nanjing 210094, China
e-mail: chenxiong@njust.edu.cn

Chaoxiang Sun

Nanjing University of Science and Technology,
200 Xiaolingwei Street,
Nanjing 210094, China
e-mail: chaoxiang110120@163.com

Jinsheng Xu

Nanjing University of Science and Technology,
200 Xiaolingwei Street,
Nanjing 210094, China
e-mail: 13913884552@163.com

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received August 20, 2013; final manuscript received March 22, 2014; published online April 29, 2014. Assoc. Editor: Irene Beyerlein.

J. Eng. Mater. Technol 136(3), 031002 (Apr 29, 2014) (8 pages) Paper No: MATS-13-1150; doi: 10.1115/1.4027291 History: Received August 20, 2013; Revised March 22, 2014

The uniaxial compressive mechanical curves of nitrate ester plasticized polyether (NEPE) propellant under different temperatures and strain rates have been obtained with a universal testing machine and modified split Hopkinson pressure bar (SHPB). The experimental results show that the mechanical properties of NEPE propellant are both rate dependent and temperature dependent. With decreasing temperature or increasing strain rate, the modulus and rigidity obviously increase. Based on the previous models proposed by Yang and Pouriayevali, we propose a modified viscohyperelastic constitutive model which can describe the mechanical response over a large range of strain rates. Then we add a rate-dependent temperature item into the modified model to make a thermovisco-hyperelastic constitutive model. By comparing the experimental results with the model, we find that the thermovisco-hyperelastic constitutive model can correctly describe the uniaxial compressive mechanical properties of NEPE propellant at different temperatures and over a large range of strain rates from the static state to 4500 s−1.

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Fig. 1

Specimen of dynamic experiment

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Fig. 2

Schematic of the split Hopkinson pressure bar setup, including temperature controlling box

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Fig. 4

Histories of stress and strain rate

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Fig. 5

Compressive curves of 273 K at low strain rates

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Fig. 6

Compressive curves of 1.667 × 10−2 s−1 at different temperatures

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Fig. 7

Compressive curves of 273 K at different strain rates

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Fig. 8

Compressive curves of 3500 s−1 at different temperatures

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Fig. 9

Physical model of viscohyperelasticity

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Fig. 10

Relationship of σ(T)/σ(T0) − T

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Fig. 11

Relationship of k-ln(ɛ·/ɛ·0)

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Fig. 13

Comparison between experiment results and the model results




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