On the shock sensitivity of explosive compounds with small-scale gap test

Area of Science:

• Energetic Materials Science
• Computational Chemistry
• Shock Wave Physics

Background:

• Understanding the shock sensitivity of energetic materials is crucial for safety and performance.
• Predictive models for explosive behavior can enhance material design and handling protocols.

Purpose of the Study:

• To measure the shock sensitivity of 13 explosive compounds using small-scale gap tests.
• To establish a relationship between molecular structure parameters and the critical initiation thickness of explosives.

Main Methods:

• Utilized improved small-scale gap tests and a Mn-Cu manometer to measure shock wave output pressures.
• Employed Density Functional Theory (DFT/BLYP/DNP) and homodesmotic reactions for molecular structure calculations.
• Applied statistical methods and Genetic Function Approximation (GFA) for data analysis and model construction.

Main Results:

• Determined the critical initiation thicknesses for 13 explosive compounds through 244 gap test shots.
• Calculated Mulliken charges, bond dissociation energies, resonance energies, and ring strain energies for the nitro groups.
• Developed a predictive model correlating molecular structural parameters with critical initiation thicknesses.

Conclusions:

• The study successfully established a quantitative relationship between molecular structure and shock sensitivity.
• The developed model offers a novel approach for predicting the shock initiation behavior of energetic materials.
• Findings contribute to the safer design and application of explosive compounds.