Abstract
ABSTRACTTo investigate a method for rapid prototyping of integrated core and shell of micro detonating cord, core ink and shell ink that are compatible with direct writing process and have excellent microscale detonation performance were designed on the basis of the coaxial direct writing technology and photothermal dual curing technology, and micro detonating cord samples were prepared. The morphology and performance of the direct writing samples were characterized and evaluated using a rheological tester, a universal testing machine, a scanning electron microscope, an optical microscope, and other instruments. The results indicate that the core ink possesses excellent rheological properties and favorable direct writing formability, whereas the shell ink can achieve rapid curing and molding, thereby providing protection and support for the core. The micro detonating cord sample exhibits a complete structure, with core and shell particles evenly distributed, and the CL‐20 explosive crystal maintains its ε form. In comparison to the raw material ε‐CL‐20, the apparent activation energy of the micro detonating cord sample increased by 41.7 kJ mol−1, whereas the impact sensitivity and friction sensitivity decreased by 533% and 275%, respectively, demonstrating excellent thermal stability and mechanical safety. When the charge density of the micro detonating cord sample is 1.53 g cm−3, the average detonation velocity reaches 6888 m s−1, and the maximum error of the “one‐in‐three‐out” detonation synchronization is 0.350 µs. The findings demonstrate that the performance of the micro detonating cord samples is superior and that integrated rapid prototyping is feasible, offering new insights into the miniaturization, charge consistency, and rapid assembly of detonating cords.
Published Version
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