UHMWPE Composite Panel Blast Load Distribution
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Solution Overview
Problem
Existing blast mitigation technologies for aircraft overhead storage bins are heavy and costly, failing to effectively disperse localized blast loads while adhering to size and weight limitations.
Innovation Solution
A lightweight composite panel incorporating ultra high molecular weight polyethylene (UHMWPE) fibers, honeycomb layers, flame-resistant thermoset adhesive layers, and fiber reinforcing layers encased in a fiberglass shell, enhancing dynamic stiffness and blast load distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional composite armor with UHMWPE fibers is used for blast mitigation, then blast protection capability is improved, but weight increases significantly
Solution Approach 1:
The patent applies composite materials by combining UHMWPE fiber layers with fiberglass shell layers and adhesive layers to create a multi-layer composite panel. This composite structure achieves effective blast mitigation through the synergistic interaction of different materials, where UHMWPE fibers provide energy absorption and the fiberglass shell provides structural integrity, thereby reducing the overall weight compared to traditional single-material armor while maintaining protection capability.
Solution Approach 2:
The patent segments the armor panel into multiple distinct layers including UHMWPE fiber layers, adhesive layers, and fiberglass shell layers. Each layer performs a specific function in the blast mitigation process, and this segmentation allows for optimized material distribution and weight reduction while maintaining overall protective performance.
2Strength
If thicker armor panels are used to improve blast resistance, then blast load dispersion capability is improved, but the panel exceeds size and weight limitations for overhead storage bins
Solution Approach 1:
The patent uses composite materials with different mechanical properties to achieve high blast load dispersion capability in a thin profile. The UHMWPE fibers provide exceptional strength-to-weight ratio and energy absorption, while the fiberglass shell provides stiffness and structural support, enabling effective blast resistance without increasing panel thickness or weight.
Solution Approach 2:
The patent changes the material parameters by selecting UHMWPE fibers with specific molecular weight and orientation, as well as optimizing the thickness and composition of adhesive and shell layers. These parameter optimizations enable high blast resistance in a lightweight, thin-panel configuration suitable for overhead storage bin applications.
3Reliability
If multiple layers are incorporated to enhance dynamic stiffness, then blast mitigation performance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the panel into standardized layers (UHMWPE fiber layers, adhesive layers, fiberglass shell layers) that can be manufactured separately and then assembled through lamination. This segmentation approach enhances dynamic stiffness through proper layer stacking while managing manufacturing complexity through modular construction and standardized interface requirements.
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
The panel effectively disperses and mitigates blast loads, providing increased protection with minimal weight increase, suitable for replacing standard overhead storage bins without altering appearance or function, and demonstrating improved blast absorption and suppression capabilities.
Implementation Method 1
the ability of the UHMWPE fibers to delocalize or disperse a blast load over the matrix
Implementation Method 2
The flame resistant thermoset adhesive layers provide for increased adhesion between the UHMWPE core and the high strength reinforcing fibers
Data Source
AI summary
Lightweight blast mitigating composite panels (10) include a first glass composite shell (14; 152), an intermediate, preferably honeycomb layer (56; 156), a reinforcing layer (60; 160), an ultra high molecular weight polyethylene fiber (UHMWPE) layer (64; 164) and a second glass composite shell (15; 168) adhered together with fire resistant adhesive layers (54; 58, 63, 66; 154, 158, 163, 166). The UHMWPE layer (64; 164) includes top and bottom coatings (70, 71) of fire resistant thermoset plastic preferably in the form of a paste. The panels (10) have use in a wide range of applications including in a blast mitigating overhead storage bin (100). The storage bin (100) includes a main body portion (133) defining a storage area formed from composite unarmored and armored panel segments (137, 138; 128-132). The unarmored and armored panel segments (137, 138; 128-132) share first and second shells (14, 15) to form an integral main body portion, with the armored panel segments (128-132) providing blast protection between the storage area and a wall (125) of an airplane cabin (120).