Acoustic Crystal Explosive Band Gap Initiation
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Solution Overview
Problem
Existing explosive technologies rely on primary explosives, which are sensitive and unstable, and require expensive multi-point initiation or lenses for volumetric or shaped-charge detonations, posing challenges in safety and cost-effectiveness.
Innovation Solution
The development of acoustic crystal explosives, configured with a periodic structure and defect cavities, which modulate acoustic indices to create band gaps that can either suppress or enhance detonation, allowing for direct initiation of secondary explosives without primary explosives and enabling reprogrammable volumetric or shaped-charge detonations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If primary explosives are used to initiate secondary explosives, then detonation sensitivity is improved, but safety and stability deteriorate due to inherent instability and sensitivity to shock, friction, and heat
Solution Approach 1:
The patent introduces an acoustic wave as an intermediary to initiate detonation in secondary explosives, replacing the traditional primary explosive mediator. The acoustic wave interacts with the periodic structure to concentrate energy at defect cavities, which then trigger detonation in the secondary explosive without requiring sensitive primary explosives.
Solution Approach 2:
The patent replaces the mechanical shock-based initiation system (primary explosives) with an acoustic wave-based system. The periodic structure and defect cavities convert acoustic energy into localized high-pressure regions that initiate detonation, substituting mechanical sensitivity with acoustic control.
2Reliability
If multi-point initiation or shaped charge lenses are used to achieve volumetric or shaped-charge detonation, then detonation effectiveness is improved, but device complexity and cost increase
Solution Approach 1:
The patent segments the explosive material into a periodic array with distinct defect cavities, where each defect cavity acts as an independent initiation point. This segmentation allows control over detonation patterns (volumetric or shaped-charge) by selectively activating specific defect cavities, replacing complex external initiation systems.
Solution Approach 2:
The patent changes the physical parameters of the explosive by introducing a periodic structure with specific acoustic properties. The band gap engineering and defect cavity resonance frequencies are tuned to concentrate acoustic energy at specific locations, enabling controlled detonation patterns without complex external systems.
3Ease of operation
If the explosive is made more sensitive to initiate easier, then ease of operation is improved, but safety deteriorates due to increased susceptibility to accidental detonation
Solution Approach 1:
The patent makes the explosive dynamic by introducing a reconfigurable periodic structure that can switch between suppression and enhancement modes. The defect cavities can be dynamically activated or deactivated, allowing the explosive to adapt its sensitivity state based on operational requirements, thereby balancing ease of initiation with safety.
Solution Approach 2:
The patent changes the acoustic parameters of the explosive structure to control sensitivity. By adjusting the periodic structure's band gap characteristics and defect cavity resonance properties, the explosive can be tuned to either concentrate acoustic energy for easy initiation or reflect acoustic energy for safety, providing dynamic control over sensitivity.
4Ease of manufacture
If traditional explosive structures are used, then manufacturing simplicity is maintained, but cost-effectiveness deteriorates due to expensive multi-point initiation requirements
Solution Approach 1:
The patent makes the explosive universal by designing a periodic structure that can perform multiple functions: it can achieve volumetric detonation, shaped-charge detonation, and safety suppression modes all within a single structure. This eliminates the need for different explosive configurations for different applications, improving cost-effectiveness while maintaining manufacturing simplicity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution provides a cost-effective and safer means to initiate secondary explosives, eliminating the need for primary explosives, allowing for controlled and efficient volumetric or shaped-charge detonations, while preventing accidental detonations through suppression mode.
Implementation Method 1
The explosive material and the medium are arranged in a periodic array that provides local contrast modulation of the acoustic index of the explosive in at least one dimension to define a band gap in the acoustic transmission spectrum
Implementation Method 2
At least one defect cavity in the periodic array creates a resonance in the band gap. The defect cavity concentrates energy from an incident acoustic (shock) wave to detonate the explosive
Implementation Method 3
The band gap reflects energy from an incident shock wave to suppress detonation of the explosive
Data Source
AI summary
An acoustic crystal explosive, which gains its properties from both its periodic structure and its composition, may be configured to suppress or enhance the sensitivity of detonation of the explosive in response to an acoustic wave. An explosive material and a medium (explosive or inactive) are arranged in a periodic array that provides local contrast modulation of the acoustic index to define a band gap in the acoustic transmission spectrum of the explosive materials. At least one defect cavity in the periodic array creates a resonance in the band gap. The defect cavity concentrates energy from an incident acoustic (shock) wave to detonate the explosive. Multiple defect cavities may be configured to provide a desired shaped charge or volumetric detonations. Means may be provided to reprogram the defect cavity(ies) to reconfigure the explosive.