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采用单轴压缩实验方法,分析了低温(-40～25℃)和应变率(1/300～1/12 s-1)对HTPB推进剂压缩力学性能的影响,得到了不同温度和应变率条件下推进剂的压缩应力-应变关系。结果表明,推进剂压缩强度和压缩模量随温度的降低和应变率的增加而逐渐增加,且均与应变率具有良好的线性对数关系(lg[σ.k(T)]=a+blg.ε和lg[E.f(T)]=c+dlg.ε),利用该关系式可对推进剂压缩力学性能进行预测。通过双因素方差分析表明,低温和应变率均对推进剂压缩力学性能具有显著影响。其中,低温对压缩模量的影响更加显著,而应变率对压缩强度和压缩应变的影响更加显著。
The influence of low temperature (-40 ~ 25 ℃) and strain rate (1/300 ~ 1/12 s-1) on the compressive mechanical properties of HTPB propellants was analyzed by uniaxial compression method. The effects of different temperature and strain rate Under compressive stress - strain relationship of propellants. The results show that the compressive strength and compressive modulus of propellants gradually increase with the decrease of temperature and strain rate, and have a good linear logarithm relationship with the strain rate (lg [σ.k (T)] = a + blg .ε and lg [Ef (T)] = c + dlg.ε), the compressibility of propellants can be predicted by this relation. Two-factor analysis of variance showed that both low temperature and strain rate had a significant effect on the compressive mechanical properties of propellants. Among them, the influence of low temperature on compressive modulus is more significant, and the effect of strain rate on compressive strength and compressive strain is more significant.