HTPB推进剂“脱湿点”及快慢组合拉伸研究

Study of dewetting points and composite rate tensile for HTPB propellants

针对空空导弹发动机对药柱结构完整性分析的特殊需求,开展了复杂载荷下某新型HTPB推进剂的力学性能试验研究,分别进行了不同温度环境下,推进剂单轴定速及快慢组合拉伸试验,研究了温度、拉伸速率、"转换应变"对推进剂极限力学性能和"脱湿"损伤行为的影响。结果表明,该新型推进剂在低温环境中具有良好的力学性能,其抗拉强度、断裂强度、最大伸长率、断裂伸长率、初始模量随拉伸速率的增大呈增大趋势,随温度的升高而减小。拉伸速率增大或者温度降低,"脱湿点"强度呈增大趋势,"脱湿点"前移,更易发生"脱湿"行为。在应变速率快慢组合试验中,推进剂极限力学性能参数随着"转换应变"的增大呈下降趋势。相关结果和结论可为复杂载荷下空空导弹发动机药柱的精细结构完整性分析提供参考。

For the requirements about structural integrity analysis of the solid motor grain of air-to-air missile, the mechanical property of a new hydroxyl-terminated polyhutadiene （HTPB） propellant was investigated by tensile tests under complex loading.Con- stant and composite speed tensile tests were made at a high, normal and low temperature to study the effect of temperature, stretc- hing rate, and switching strain on the ultimate mechanical properties and dewetting of these propeUants.The results show the propel- lant has good mechanical properties at low temperature, simultaneously increases in tensile strength, breaking strength, maximum e- longation,breaking elongation and initial modulus with the increasing stretching rate or decreasing temperature.The dewetting point has the forward trend and strength of which has the increasing trend with the increase of stretching rate or decrease of temperature, showing a higher probability to dewctting. The composite rate tensile tests show a decrease trend in tensile strength, breaking strength, maximum elongation and breaking elongation with the increase of the switching strain.They can provide a reference in the process of air-to-air missile motor meticulous structural integrity analysis.