固体推进剂应力和应变与使用寿命关系

Relationship between stress-strain and service life of solid propellant

关键词:  固体推进剂  储存性能  使用寿命  应力  应变

Key words:  Solid propellant  Storable performnce  Service life  Stress  Strain

摘要:

以Eying动力学公式为基础,结合推进剂应力-应变关系公式,将应力应变因素引入动力学公式,推导出了应力和应变与动力学公式的关系,并利用定载荷试验和定应变试验验证了上述关系。研究表明在推进剂的老化过程中,应力和应变的作用等效于降低了推进剂老化的表观活化能,从而加速推进剂的老化。应力对活化能作用系数γ的计算结果表明,应力和应变对加速推进剂老化、缩短推进剂寿命的作用是显著的。利用推导出的应力和应变与动力学公式的关系,可以使推进剂寿命预测的结果更接近于发动机中推进剂的实际使用寿命。

Abstract:

Based on the Eying dynamics formula and stressstrain relation of solid propellant,the factors of stress and train were involved in the dynamics formula to obtain the relationships between them,and the relationships were validated by constant load test and constant strain test.The investigation shows the effects of stress and strain,which accelerate the aging of propellant.It is equivalent to the effect of reducing the aging apparent activation energy.The calculated result of coefficient γ indicates that the stress and strain have a remarkable effect on accelerating the aging of solid propellant to shorten the service life of it.The predicted service life of the propellant can be more similar to the actual service life by means of dynamics formula with stress or strain involved.