三元乙丙基固体推进剂包覆层拉伸性能影响因素研究

Study on the influencing factors in the tensile property test of EPDM inhibitor for solid rocket propellant

采用静态单轴拉伸手段,研究了不同试验温度(-40℃、20℃、50℃)、相同拉伸速率(500mm/min)以及相同试验温度(-40℃)、不同拉伸速率(50mm/min、100mm/min、500mm/min)对三元乙丙橡胶类包覆层拉伸应力应变性能的影响。研究结果表明:同一拉伸速率(500mm/min),-40℃试验温度,材料发生脆性断裂,20℃、50℃试验温度,材料均发生屈服、高弹形变直至断裂;随着温度的升高,拉伸强度降低,拉断伸长率增加;同一试验温度(-40℃),拉伸速率为500mm/min时,材料发生脆性断裂,拉伸速率为50mm/min和100mm/min时,材料发生弹性形变。结合GJB770B-2005方法413.1,选用100mm/min的拉伸速率比较适合。

The effects of different pull rate（50mm/min,100mm/min,500mm/min）,test temperature（-40℃,20℃,50℃）on tensile stress-strain properties of EPDM inhibitor for solid rocket propellant were studied.The results showed that the inhibitor took place brittle fracture at-40℃,and yield deformation,high elastic deformation then broken at 20℃、50℃ when the pull rate was 500 mm/min.The tensile strength decreased,however,elongation at break increased as the temperature increasing.At-40℃,the inhibitor took place brittle fracture as the pull rate was 500 mm/min,elastic deformation as the pull rate was 50 mm/min,100 mm/min.In view of GJB770B-2005_413.1,it was adaptive for the inhibitor that the pull rate was 100 mm/min at-40℃.