Composite Shaft Impact Shield for Visible Damage Protection
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Solution Overview
Problem
Conventional fiber-reinforced polymer-matrix composite (PMC) components in aircraft, such as landing gear assemblies, are prone to impact damage from debris, which can go undetected due to lack of visual indication, compromising structural integrity and weight-saving benefits.
Innovation Solution
A shaft assembly comprising a composite tube with an impact shield and a shock absorbing sleeve, where the impact shield is concentrically mounted around the composite tube with a gap, allowing the shield to absorb impact forces and provide visual damage detection, while the composite tube remains load-bearing and lightweight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If conventional PMCs are used to reduce weight, then weight-saving benefits are achieved, but the components become more prone to impact damage
Solution Approach 1:
A shock-absorbing sleeve is installed within the composite tube before impact events occur. This sleeve is specifically designed to cushion and absorb impact forces from bird strikes, debris, and other harmful factors, protecting the load-bearing composite structure while maintaining the weight-saving benefits of using composite materials
2Strength
If the thickness of composite component is increased to protect against impact damage, then impact resistance is improved, but weight-saving benefit is reduced
Solution Approach 1:
The protective function is segmented from the load-bearing function. The composite tube is divided into the load-bearing structural wall and a separate shock-absorbing sleeve. This allows the main tube to remain thin and lightweight for weight savings, while the dedicated sleeve provides impact protection without adding excessive weight to the primary load-bearing structure
Solution Approach 2:
The shock-absorbing sleeve is designed as a sacrificial, replaceable component that absorbs impact damage in place of the expensive, critical load-bearing composite tube. After an impact event, the sleeve can be replaced rather than replacing the entire tube assembly, providing cost-effective protection
3Object-affected harmful factors
If thick-walled composite structure is used, then impact protection is provided, but visual indication of impact damage is not produced
Solution Approach 1:
The shock-absorbing sleeve incorporates visual indicators that change color or show visible signs when subjected to impact forces. This allows operators to easily detect whether an impact event has occurred and assess the level of damage, providing clear visual feedback without requiring complex inspection equipment or procedures
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 impact shield effectively mitigates damage to the composite tube by absorbing impact forces and providing visible signs of damage, ensuring structural integrity and maintaining weight-saving benefits, reducing the need for thicker composite structures and costly certifications.
Implementation Method 1
a shock absorbing sleeve disposed in the gap between the composite tube and the impact shield
Implementation Method 2
The shock absorbing sleeve may comprise at least one of a braided aramid material, a glass fiber material, a thermoplastic fiber material, a viscoelastic polymer material, an elastomeric polymer material, and a foam material
Data Source
AI summary
A shaft assembly includes a composite tube and an impact shield. The composite tube has a longitudinal centerline axis and the impact shield may be disposed around the composite tube and may extend along a length of the composite tube. A gap may be defined between the composite tube and the impact shield. Generally, shaft assembly is configured to inhibit impact damage to the composite tube and/or facilitate visual detection of damage from impacts. The shaft assembly may further include a shock absorbing sleeve disposed in the gap between the composite tube and the impact shield.