国产HTPB复合固体推进剂Ⅰ-Ⅱ型裂纹断裂性能实验研究

Fracture Behavior of HTPB Composite Propellant in Ⅰ-Ⅱ Mixed Mode Crack

采用WDN-10KN材料实验机对含Ⅰ-Ⅱ复合型裂纹的HTPB复合固体推进剂进行了拉伸速率为2mm.min-1的单轴拉伸试验,用摄像机记录了推进剂裂纹扩展至断裂的整个过程。得到了六种不同裂纹倾斜角下的力-变形曲线及裂纹扩展开裂角和断裂载荷。与T断裂准则、S断裂准则和σθ断裂准则进行比较,结果表明推进剂裂纹扩展开裂角与T断裂准则的数值计算结果较为接近,说明可以借助于T断裂准则对推进剂裂纹扩展的初始开裂角进行初步的理论预测。

HTPB composite solid propellant containing slant internal cracks under uniaxial tensile load were measured by using of material testing device WDN-10KN, with the tensile rate of 2 mm · min^-1. The whole progress of Crack propagation was recorded by camera. Curves of the Loading-Displacement, crack initiation angle and fracture loading were obtained. By comparison with series fracture criteria including T-Criterion, S-Criterion, σθ-Criterion, the crack initiation angle of solid propellant obtained is in approximately agreement to that from T-Criterion, showing that the T-Criterion can be used as a theory prediction to the crack initiation angle of the composite solid propellant.