Frangible Foam Helmet Liner with Impact Detection Circuit
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Solution Overview
Problem
Current protective helmets and devices often fail to effectively absorb impact forces, leading to traumatic brain injuries and other injuries, as they rely on traditional materials that do not adequately dissipate energy, particularly in high-impact scenarios.
Innovation Solution
The use of frangible energy-absorbing materials, such as foamed glass or ceramic, combined with compliant foams and detection circuits to absorb and indicate impact forces, allowing for controlled energy dissipation and notification of material compromise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional foam materials are used in protective helmets, then the structure is simple and cost is low, but the energy absorption capability is insufficient in high-impact scenarios
Solution Approach 1:
The patent combines frangible material (such as glass beads or ceramic particles) with foam material to create a composite energy-absorbing layer. This composite structure enables superior energy absorption through controlled material fragmentation while maintaining a relatively simple overall helmet structure. The frangible particles fracture under impact to dissipate energy, complementing the foam's compressive energy absorption.
Solution Approach 2:
The patent modifies the physical and mechanical parameters of the energy-absorbing material by incorporating frangible particles with specific size distributions, hardness values, and concentration levels within the foam matrix. These parameter adjustments enable the material to transition from simple compression (foam alone) to controlled fragmentation and energy dissipation (composite material), significantly improving high-impact energy absorption.
2Strength
If frangible material is added to enhance energy absorption, then impact protection is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent divides the energy-absorbing function into two distinct components: the foam matrix that provides structural support and initial compression, and the dispersed frangible particles that provide controlled fragmentation. This segmentation allows each component to be optimized independently and simplifies manufacturing, as the frangible particles can be mixed into the foam during standard foam fabrication processes rather than requiring separate assembly steps.
Solution Approach 2:
The frangible particle-foam composite serves multiple functions simultaneously: it provides impact protection through both compression and fragmentation, maintains structural integrity of the helmet liner, and offers tunable energy absorption characteristics. This multi-functionality reduces the need for additional specialized components, thereby simplifying overall manufacturing.
3Reliability
If detection circuits are added to detect material compromise, then safety monitoring is improved, but the device complexity and cost increase
Solution Approach 1:
The patent incorporates detection circuits with indicators that provide real-time feedback on the integrity of the frangible material and foam structure. When impact forces compromise the energy-absorbing materials, the detection system activates visual or electronic indicators to alert the user. This feedback mechanism enables timely replacement of compromised components, maintaining optimal protective performance.
Solution Approach 2:
The detection circuit acts as an intermediary between the physical state of the energy-absorbing materials and the user. Rather than requiring direct inspection of material integrity, the detection system translates mechanical compromise into easily observable signals (such as LED indicators or wireless alerts), simplifying user interaction while enhancing safety monitoring reliability.
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 enhances the energy absorption capabilities of protective gear, reducing the risk of traumatic brain injuries and other impacts by converting impact energy into a controlled destruction of the frangible material, while also providing a means to detect and indicate material compromise for timely replacement and response.
Implementation Method 1
frangible energy absorbing materials... converting impact energy into a controlled destruction of the frangible material
Implementation Method 2
compliant foam material... for absorbing at least a portion of an impact force
Data Source
AI summary
Embodiments include a protective helmet including a protective shell having an interior surface and an exterior surface. A padding layer is affixed to the interior surface. The padding layer includes a compliant material and a frangible material, such as glass foam. At least the frangible material is enclosed in a container. A detection circuit detects compromise of the frangible material, and outputs an indicator in the event the compromise is detected. The detection circuit may include a frangible wire configured to break in the event the frangible material is compromised. The indicator may include an LED, and/or radio-frequency signals. The radio-frequency signal may include an identifier for the helmet. The padding layer may include a plurality of pads each containing compliant material and frangible material. The plurality of pads may include one or more fasteners for releaseably affixing the pads to the interior surface of the protective shell.