Scanning Electron Microscope In-situ Tensile Testing of Interface of NEPE Propellant/Lining Layer/Heat Insulating Layer

By means of in-situ scanning electron microscopy tests, the process of tensile fracture of nitrate ester plasticized polyether (NEPE) propellant/lining layer/heat insulating layer was observed and measured in situ. By the marker point displacement processing technology, quantitative strain of NEPE propellant, lining layer and heat insulating layer was gained. The results show that:the high modulus layer (thickness 40 μm) lied on the interface of NEPE propellant and hydroxyl-terminated polybutadiene (HTPB), which was important to adhesive property of the interface of NEPE propellant and lining layer. In-situ tensile tests were helpful to learn the adhesive condition of the interface and could provide support for formula improvement and aging property research.