Analysis of Tensile Strength of PBT/A3/AP System Based on Power Law Equation
In order to solve the difficulty in predicting the mechanical properties of poly(3,3'-bis(azidomethyl)oxetane-co-tetrahydrofuran)(PBT)solid propellant,the tensile fracture behavior of PBT/A3/AP system is analyzed.A power law equation describing the tensile strength of the system is established.The influence rules of interfacial phase,dispersed phase and continuous phase on tensile strength were obtained.The results show that the elastic modulus and tensile strength of propellant increase with the decrease in oxidant particle size and the increase in volume fraction.The influence of interfacial phase interaction on the tensile strength of propellant is dominant,which is positively correlated with vf2/r(vf:volume fraction,r:oxidant particle size).When the oxidant particle size is less than 100 μm,the dominant role of interfacial phase becomes more obvious.The effect of dispersed phase increases with the increase in oxidant particle size.The value is positively correlated with vfr5.When the particle size is larger than 100 μm,the effect of dispersed phase becomes apparent.When the particle size is larger than 150 μm,the effect of dispersed phase approaches that of the interfacial phase.In this case,the interaction between particles cannot be ignored.The continuous phase has little influence on the tensile strength of propellant.The value is positively correlated with(1-vf)5.Compared with the interface phase,the effect of continuous phase is almost negligible.The fitting results of the power law equation for the tensile strength of PBT solid propellant are in good agreement with the experimental results(R2＞0.99).The calculated results can be used as reference for propellant formulation design,thereby reducing the development cycle while simultaneously lowering the costs in terms of manpower and resources.
Poly(3,3'-Bis(azidomethyl)oxetane-co-Tetrahydrofuran)solid propellanttensile strengthoxidizerpower law equation
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