Edge Structure of Fiber Reinforced Resin Body
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Solution Overview
Problem
Fiber reinforced resin structure bodies experience breakage and delamination issues at edge parts due to stress concentration around fastening holes, and the use of additional reinforcement materials increases the number of components and production steps.
Innovation Solution
An edge structure comprising first and second fiber reinforced resin portions, where the second portion has an edge-side cover part with fibers arranged along the edge section of the first portion, enhancing reinforcement and protection while minimizing component and step count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If reinforcement materials such as flange members and adhesive agents are used to reinforce the edge part, then the strength and protection of the edge part is improved, but the number of components and production steps increases
Solution Approach 1:
The patent combines the reinforcement function and edge protection function into a single integrated edge-side cover part made of fiber reinforced resin. This cover part is formed integrally with the main body through co-molding, merging multiple functions (reinforcement, protection, structural integrity) into one component, thereby eliminating the need for separate flange members and adhesive agents while maintaining or improving edge part strength
Solution Approach 2:
The edge-side cover part serves multiple functions simultaneously: it reinforces the edge part against stress concentration, protects the edge from external loads, and provides structural integration with the main body. This multi-functional design eliminates the need for separate reinforcement materials and reduces the overall component count while improving the versatility of the single edge cover component
2Strength
If reinforcement materials such as flange members and adhesive agents are used to reinforce the edge part, then the strength and protection of the edge part is improved, but the number of production steps increases
Solution Approach 1:
The reinforcement and edge protection functions are merged into a single edge-side cover part that is co-molded with the main body in one production process. This integration eliminates multiple separate production steps (such as separate attachment of flange members and application of adhesive agents) while maintaining improved edge part strength, thereby increasing overall productivity
Solution Approach 2:
The edge-side cover part is formed integrally with the main body during the initial molding process, performing the reinforcement action in advance during manufacturing rather than requiring subsequent assembly steps. This preliminary integration of the reinforcement structure eliminates later production steps and improves productivity while ensuring edge part strength from the outset
3Ease of operation
If fastening holes penetrate the stacked body, then fastening capability is improved, but stress concentration at peripheral parts causes breakage and delamination
Solution Approach 1:
The patent applies local reinforcement by providing the edge-side cover part specifically at the edge sections adjacent to fastening holes, where stress concentration occurs. The fiber orientation in the edge-side cover part is designed to follow the edge section contour, providing localized stress distribution improvement without compromising the overall fastening capability. This local quality enhancement protects against breakage and delamination while maintaining fastening functionality
Data Source
AI summary
In an edge structure of a fiber reinforced resin structure body, an edge part of the structure body is enabled to be efficiently reinforced, and the edge part of the structure body is enabled to be efficiently protected. The present invention relates to an edge structure of a fiber reinforced resin structure body having a first fiber reinforced resin portion (hereinafter referred to as “first portion”) and a second fiber reinforced resin portion (hereinafter referred to as “second portion”) composed using a fiber reinforced resin, the first portion having a layer part formed in layers. In the edge structure of a fiber reinforced resin structure body, the second portion has an edge-side cover part extending along an edge section of the layer part of the first portion, and a plurality of fibers in the edge-side cover part are arranged along the edge section of the layer part.