含Ⅰ型裂纹复合固体推进剂双轴拉伸实验研究

Biaxial Tensile Experiment for Composite Solid Propellant With Crack

开展了复合固体推进剂含Ⅰ型裂纹拉伸实验研究。采用不同拉伸速率,获得双向拉伸极限特性主曲线和应力—应变破坏曲线,为推进剂材料破坏分析的经验准则提供判据。结果表明,如果复合固体推进剂的断裂阻力被看作是材料常数,则裂纹驱动力必受到平行于裂纹之应力的影响,在一定范围内裂纹驱动力与平行应力成反比关系。当平行应力超过屈服应力以后,因平行应力太大超过了损伤阀值,在推进剂中造成了损伤,从而断裂韧性下降。

Tensile experiments of composite solid propellant with typeⅠare presented in this paper. Through the experiments under different tension speed, the limit characteristic curve of biaxial tension and stress-strain wreck curve are obtained. force of crack is in And this offers criterion for the wreck analysis of propellant material. The results show the drivinginverse proportion to the parallel stress when the parallel stress is less than yielding stress.