Composite Raised Features for Visible Impact Damage Detection
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Solution Overview
Problem
Detecting impact damage in composite materials, such as fiber-reinforced polymers, is challenging due to the internal nature of damage like delamination or broken fibers, which can lead to unexpected failures without visible signs on the exterior.
Innovation Solution
A monolithic fiber-reinforced polymer composite component is manufactured with a main portion and at least one raised feature. The raised feature is designed to incur visually perceptible damage when the component is subjected to an impact with energy above a predetermined threshold, while resisting impacts below this threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If composite components are strengthened or reinforced beyond that required for their primary function to detect BVID, then the reliability of damage detection is improved, but the weight and material cost of components increase
Solution Approach 1:
The patent applies local quality by creating a raised feature with different structural properties than the main component body. The raised feature has reduced wall thickness or different fiber orientation specifically at the impact detection zone, making it more susceptible to visible damage while the rest of the component maintains its full structural strength for primary functions.
Solution Approach 2:
The patent segments the component into two functional zones: the main portion with full structural integrity for primary load-bearing functions, and the raised feature with modified properties dedicated to impact detection. This segmentation allows each zone to be optimized independently for its specific purpose.
2Reliability
If composite components are strengthened or reinforced beyond that required for their primary function to detect BVID, then the reliability of damage detection is improved, but the material cost of components increase
Solution Approach 1:
The raised feature uses localized material modification rather than uniform reinforcement throughout the entire component. This means additional material is only used where needed for detection, rather than reinforcing the entire component structure.
Solution Approach 2:
By separating the detection function into a distinct raised feature, the patent avoids the cost of reinforcing the entire component. The material cost increase is limited to the small volume of the raised feature rather than the whole component.
3Measurement precision
If the energy level at which BVID is established is reduced to improve detection sensitivity, then the detection capability is improved, but the structural performance of the component is compromised
Solution Approach 1:
The raised feature has locally modified properties (reduced thickness, different fiber layout) that make it more sensitive to low-energy impacts. This local sensitivity does not compromise the overall structural performance because the main component body retains its full structural integrity.
Solution Approach 2:
The patent creates a separate detection element (raised feature) with optimized sensitivity characteristics, independent of the main structural portion. This allows the detection sensitivity to be optimized without compromising the structural strength of the primary load-bearing components.
Data Source
AI summary
A method of manufacturing a monolithic fiber-reinforced polymer composite component is provided. The method comprises providing a mould comprising a main cavity and at least one additional cavity that extends from the main cavity; introducing a polymer matrix material containing chopped fiber reinforcement into the mould to fill the main cavity and the at least one additional cavity to form a monolithic fiber-reinforced polymer composite component with a main portion formed in the main cavity and at least one raised feature formed in the additional cavity and extending from a surface plane of said main portion. The at least one raised feature is arranged to incur visually perceptible damage when the component is subject to an impact with an energy above a predetermined impact energy threshold and to resist an impact with an energy below the predetermined impact energy threshold.