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738                                                                           李辉,许进升,周长省,陈雄,郑健

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            Failure Criterion Related to Temperature for HTPB Propellant

            LI Hui,XU Jin⁃sheng,ZHOU Chang⁃sheng,CHEN Xiong,ZHENG Jian
           (School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)

            Abstract:To establish a failure criterion for hydroxyl‐terminated polybutadiene(HTPB)propellant which considers the effect of
            temperature and strain rate. The time‐temperature shift factor of HTPB propellant was obtained by stress relaxation tests at differ‐
            ent temperatures(233.15,253.15,273.15,293.15,323.15,343.15 K)of HTPB propellant. Based on cumulative damage theory
            and linear viscoelastic theory,a failure criterion of propellant with time‐temperature shift factor α T was established. The damage
            parameters of failure criterion were obtained by combining the uniaxial tensile test data at different temperatures and different
            strain rates. The failure criterion was used to predict the damage evolution characteristics and critical failure time of propellant
            material at different temperatures and strain rates. Compared with the experimental results,it is found that the relative error pre‐
            dicted by the failure criterion is less than 20%,indicating that the failure criterion can predict the failure condition of HTPB pro‐
            pellant in the range of low temperature 233.15-273.15 K at tensile speed of 2-500 mm·min -1  and in the range of high tempera‐
                                                          -1
            ture 293.15-343.15 K at tensile speed of 0.5-100 mm·min .
            Key words:hydroxyl‐terminated polybutadiene(HTPB)propellant;temperature correlation;failure criterion;damage revolution
            CLC number:TJ55;V435                       Document code:A                   DOI:10.11943/CJEM2018068









            Chinese Journal of Energetic Materials,Vol.26, No.9 , 2018(732-738)  含能材料      www.energetic-materials.org.cn
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