Design and experimental study on aluminum clapboard of dual-pulse solid motor

Design methods for aluminum clapboard with nicks and their assemblies were put forward. Numerical analysis for design and experimental study were performed. Pressure and breaking experiments of the aluminum clapboards with different thicknesses and nicks depths were carried out, and the experimental results were analyzed. The results show that the aluminum clapboard with supporter is of high endurance under the pressure in No.1pulse, while rupture under the pressure in another pulse, which meets the requirements of pulse motor clapboard. The center of the clapboard, also is the crossover of nicks, belongs to the largest strain zone. Clapboards can burst from the weakness in the center, which fulfill the requirement of directional crack. Numerical calculations and experimental results both show that the broken pressure increase with the increment of clapboards' thickness, while the thicknesses of clapboards in nicks' zone play a key role in deciding broken pressure in No.2 pulse.