HTPB推进剂细观损伤机理的声发射实验研究

Acoustic emission experimental study on meso-damage mechanism of HTPB propellant

关键词:  端羟基聚丁二烯推进剂  裂纹扩展  缺陷分析  声发射

Key words:  Hydroxy terminated polybutadiene propellant  Crack propagation  Defect analysis  Acoustic emission

摘要:

采用测定单轴定速拉伸条件下标准哑铃形 HTPB推进剂试件声发射 (AE)信号的方法 ,对 HTPB复合固体推进剂在载荷作用下细观损伤及其扩展的机理进行了研究。实验结果表明 :声发射累计能量对应于细观损伤产生和扩展两个不同阶段 ,提出了一个描述 HTPB复合固体推进剂细观损伤扩展的物理模型 ,该模型解释了不同拉伸速率下 HTPB复合固体推进剂破坏后出现的不同物理现象

Abstract:

By way of measuring the Acoustic Emission (AE) signal of HTPB composite solid propellant in condition of uniform speed,the mecro mechanism of meso damage and its propagation of HTPB composite solid propellant were studied.The results of AE test show that AE cumul energy corresponds to two stages of generation and propagation of meso damage of HTPB composite solid propellant.A physical model describing meso damage propagation of HTPB composite solid propellant was put forward and it has explained the mecro mechanism for the phenomenon varied from the strain speed after the destraction of the HTPB composite solid propellant.