Laminar Impact Mitigating Membrane for Rotational Acceleration
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Solution Overview
Problem
Standard protective equipment is inadequate in mitigating rotational accelerations during oblique impacts, leaving objects vulnerable to further damage, particularly in high-risk activities where both linear and rotational accelerations occur, such as in contact sports and industrial activities.
Innovation Solution
The impact mitigating membrane consists of a laminar core with encapsulating layers that allow relative motion to dissipate tangential kinetic energy, incorporating self-lubricating materials and energy-absorbing layers to spread impact forces over a larger area, reducing both rotational and linear accelerations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If standard protective equipment is designed based on directionally normal impacts, then linear acceleration protection is improved, but rotational acceleration mitigation is insufficient
Solution Approach 1:
The protective equipment is segmented into multiple functional layers: a first layer for absorbing normal impact forces (linear acceleration protection), and a second layer with frictional interfaces for dissipating tangential forces (rotational acceleration mitigation). This segmentation allows each layer to specialize in mitigating specific components of impact forces.
Solution Approach 2:
Different regions of the protective equipment have different properties: the first layer has high compressibility for normal force absorption, while the second layer has high frictional characteristics for tangential force dissipation. This local differentiation of material properties enables simultaneous protection against both linear and rotational accelerations.
2Force
If protective equipment uses a single rigid structure, then impact force resistance is improved, but rotational acceleration transfer is reduced
Solution Approach 1:
The protective equipment incorporates dynamic elements including a compressible intermediate layer that deforms under impact, and a frangible second layer that can break or deform to dissipate rotational energy. This dynamic response allows the structure to adapt to both normal and oblique impact forces, reducing rotational acceleration transfer to the protected object.
Solution Approach 2:
The protective equipment uses composite material structures combining rigid outer layers for impact force resistance with softer, frictional intermediate layers for rotational energy dissipation. This composite approach integrates materials with different mechanical properties to simultaneously address both normal and tangential impact components.
3Ease of manufacture
If protective equipment is made from a single material, then manufacturing simplicity is improved, but effectiveness against oblique impacts is reduced
Solution Approach 1:
The protective equipment is divided into multiple layers with distinct functions: a first layer for normal impact absorption, an intermediate frangible layer for rotational energy dissipation, and a second layer for additional protection. This segmentation into functional zones allows each layer to be optimized for its specific purpose while maintaining overall manufacturing feasibility.
Solution Approach 2:
The equipment employs composite material construction with at least two different material types: a rigid material for the outer layers providing impact resistance, and a frangible or compressible material for the intermediate layer providing rotational energy dissipation. This composite approach balances manufacturing considerations with enhanced oblique impact protection.
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
Effectively reduces the transfer of oblique impact forces by dissipating tangential and normal components, thereby minimizing damage from rotational and linear accelerations, enhancing protection against traumatic injuries.
Implementation Method 1
a lubricating layer between the first lamina and the second lamina, wherein the first lamina is capable of sliding relative to the second lamina during an oblique impact to reduce the transfer of tangential kinetic energy
Implementation Method 2
incorporating self-lubricating materials and energy-absorbing layers to spread impact forces over a larger area, reducing both rotational and linear accelerations
Data Source
AI summary
Generally described, aspects of the disclosed subject matter are directed to impact mitigating membranes. In accordance with aspects of the present disclosure, the impact mitigating membranes generally include a laminar core having a first lamina and a second lamina coupled to the first lamina and configured to shift relative to the first lamina to dissipate kinetic energy resulting from an oblique impact force. The laminar core may include a lubricating layer or self-lubrication between the lamina to reduce friction. In general, the laminar core is surrounded by first and second encapsulating layers positioned adjacent each lamina. An anchoring attachment coupled to one or more of the first and second encapsulating layer and associating with the laminar core constrains relative lateral motion between the laminar core and the first and second encapsulating layers.