论文部分内容阅读
为了获得交变应力作用下推进剂的疲劳性能参数,利用材料试验机对推进剂试件进行了反复拉伸试验,考察了定应力和拉伸速率对推进剂疲劳破坏的影响。结果表明,当拉伸速率一定时,推进剂试件所受的定应力越大,其循环破坏次数越少,而且应力水平和循环破坏次数的自然对数符合指数函数关系;当应力不变时,拉伸速率越快推进剂试件越容易发生破坏。试验所获得的推进剂疲劳性能参数可用于预估固体火箭发动机在交变应力作用下的寿命。
In order to obtain the fatigue performance parameters of propellants under alternating stress, the tensile test was carried out on the propellants by using a material testing machine. The effects of constant stress and tensile rate on the fatigue failure of propellants were investigated. The results show that when the tensile rate is constant, the greater the constant stress on the propellant specimen is, the less the number of cyclic damage is, and the natural logarithm of the stress level and the number of cyclic damage is exponential. When the stress is constant , The faster the tensile rate, the more likely damage to the propellant specimen. The propellant fatigue performance parameters obtained from the experiments can be used to predict the life of solid rocket motors under alternating stress.