Publications by authors named "Zongtao Guo"
In the field of gun launched missile extended range rocket, the propellant grain in the rocket needs to withstand significant launch loads during their firing phase, and also bear the high pressure caused by ignition, and the impact of launch overloads and ignition shocks on the structural integrity of propellants becomes very important. So this work investigated the dynamic initiation fracture toughness of the composite modified double-base (CMDB) propellant by both experiments and numerical simulations. The dynamic mechanical properties test of the cracked straight through flattened Brazilian disc (CSTFBD) specimens were conducted using a modified Split Hopkinson pressure bar (SHPB).
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- The study investigates how NEPE propellants behave and fail under sudden impact loads, focusing on their mechanical properties and structural integrity.
- High strain rate uniaxial impact tests were conducted using a separated Hopkinson pressure bar, recording deformation and failure processes with high-speed cameras.
- Results indicated that higher strain rates lead to increased deformation, earlier failure, and severe damage, with specific failure types like transgranular failure and matrix tearing being prominent. A new nonlinear visco-hyperelastic model was developed to better understand these effects.