Abstract:

In order to study the failure behavior of HTPB propellant/liner interface, a kind of small specimen was designed and its fracture behavior under axial tensile was observed by using a CCD microscope. The relations of the average crack width and dewet length with the clamping fixture displacement were determined by using image measurement method, and the bonding quality of the interface was analyzed from the macroscopic and microscopic views. The experiment results show that the dewet of interface between the granulated AP close to liner and the liner is the main cause of the performance degradation, and the interface energy between AP and propellant binder is greater than that between AP and liner. It can be a supplement to the traditional way to assess the bonding quality of solid propellant and liner.

Key words: ordnance science and technology, interface, microscopic tensile, dewet, microscopic fracture