Composite Detection Layer for Barely Visible Impact Damage
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Solution Overview
Problem
Composite structures, particularly those made from fiber-reinforced plastics, are susceptible to barely visible impact damage (BVID) which can cause subsurface damage like delamination, making it difficult to detect without sophisticated nondestructive inspection methods.
Innovation Solution
A composite structure with a detection layer comprising multiple strips of glass fibers embedded in a matrix material, aligned with the composite body's span axis and spaced apart to create discontinuities, enhancing the visibility of impact damage by creating a more substantial visual indication of impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If a continuous detection layer is used, then impact damage visibility is improved, but static charge accumulation increases
Solution Approach 1:
The detection layer is divided into multiple discrete strips spaced apart from each other, creating discontinuities in the layer. This segmentation allows the detection layer to maintain sufficient impact damage visibility through the glass fiber strips while reducing continuous surface area that can accumulate static charges, thus resolving the contradiction between detection effectiveness and static charge accumulation.
2Measurement precision
If sophisticated nondestructive inspection methods are used, then BVID detection capability is improved, but inspection complexity and cost increase
Solution Approach 1:
The detection layer incorporates glass fiber strips that passively indicate impact damage through visual changes (such as fiber alignment or discontinuity visibility) without requiring external inspection equipment or complex systems. The structure itself provides the detection function, eliminating the need for sophisticated nondestructive inspection methods and reducing both complexity and cost while maintaining adequate BVID detection capability.
Data Source
AI summary
A composite structure including a composite body having an outer surface, wherein the composite body is elongated along a span axis, and a detection layer connected to the outer surface of the composite body, the detection layer including a plurality of strips, wherein each strip comprises a plurality of glass fibers embedded in a matrix material, is elongated along a detection axis, the detection axis being substantially aligned with the span axis, and is spaced a non-zero distance apart from adjacent strips such that a discontinuity is defined between adjacent strips.