Research on the Viscoelasticity-viscoplasticity-viscodamage Constitutive Model of Composite Modified Double Base Propellant

doi:10.3969/j.issn.1000-1093.2018.07.008

Abstract

Abstract: A viscoelasticity-viscoplasticity-viscodamage constitutive model is derived to characterize the complicated mechanical properties of composite modified double base (CMDB) propellant. The model parameters are obtained by a series of creep-recovery tests. Creep-recovery tests under different stress levels and loading times as well as some constant loading rate-recovery tests are done to verify the model. The test results show that the viscoelasticity-viscoplasticity-viscodamage constitutive model is capable of predicting the creep-recovery response and constant loading rate-recovery response of CMDB propellant. Compared with viscoelasticity-viscoplasticity constitutive model, the viscoelasticity-viscoplasticity-viscodamage model has a significant improvement in predicting the mechanical properties of CMDB propellant. The damage variable becomes steady gradually after it slowly increases first and then rapidly increases with strain. When the strain changes more slowly, the damage variable is larger, and the difference between the predicted results of the viscoelasticity-viscoplasticity-viscodamage model and the viscoelasticity-viscoplasticity model is greater.Key

Key words: compositemodifieddoublebasepropellant, viscoelaticity, viscoplasticity, viscodamage, creep, recovery, constitutivemodel

CLC Number:

V512⁺.3

WANG Hong-li, XU Jin-sheng, LIU Zong-kui, TONG Xin, ZHOU Chang-sheng. Research on the Viscoelasticity-viscoplasticity-viscodamage Constitutive Model of Composite Modified Double Base Propellant[J]. Acta Armamentarii, 2018, 39(7): 1308-1315.

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第7期2018 年7月兵工学报ACTA
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