复合推进剂拉伸应变条件下燃速变化计算分析

摘要

Computational model on burning rate change of composite propellant under tensile strain was established,and experi-mental verification was done on the model. The results show that the model corresponds with experimental data within tensile strain increasing from 0 to 20%.Burning rate ratio and tensile strain obey the quadratic relationship,burning rate increases with strain;Burning rate ratio of composite propellant which has lower poisson ratio increases faster as tensile strain decreasing;The less binder component of composite propellants,the more significant the burning ratio changes under strain state.Loose and crack will appear on the binder under tension,and interstices appear between the binder and AP.The exposed area of AP increases,furthermore the pro-pellant burning is faster,and the burning ratio is bigger.%建立了复合推进剂在拉伸应变条件下燃速变化计算模型,并针对所建立方程进行了实验验证。结果表明,所建立模型在拉伸形变为0%~20%情况下与实验结果相符,燃速比与拉伸形变之间服从二次函数关系,燃速随应变增加而增大；复合推进剂的泊松比越小,则燃速比随拉伸应变增长越快；复合推进剂中粘合剂组分越少,应变状态下燃速比变化越显著。复合推进剂在拉伸状态下,粘合剂会出现疏松和裂纹,同时粘合剂和固体颗粒AP之间出现空隙,AP裸露面积增加,进而推进剂燃烧速度更快,燃速比更大。