Quantitative experimental study on effect of bonding agents on the dewetting damage of NEPE solid propellant

On the basis of qualitative observation of the effect of different content of 22# bonding agents on the fracture propagation process through the in-situ SEM observations, effect of the bonding agents amount on mechanical properties of NEPE solid propellant was quantitatively studied by the process of image processing and differential box counting calculating. The results show that the interaction between the solid particle and the binder matrix could be enhanced as the increase of the 22# bonding agent content. At the same time, with the aid of curve of the fractal dimension to elongation, the evolution tendency of the mechanical properties of NEPE solid propellant could be quantitatively compared through the slope of the curve and the position of the inflection point.