Composite Material Member Resin-Rich Layer Boring
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Solution Overview
Problem
When fiber-reinforced plastic (FRP) members are subjected to boring processes, peeling of reinforcing fibers and loss of resin can occur, leading to cracks in the fastening portion, which compromises the strength and reliability of the fastening.
Innovation Solution
A composite material member is designed with an FRP layer and a resin-rich layer on both surfaces, where the resin-rich layer has a fiber content of 5% or less than the FRP layer, allowing the hole to penetrate both layers, thereby supporting the reinforcing fibers during the boring process and reducing peeling and resin loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a hole is bored in the FRP member to fasten it to an object, then the FRP member can be fastened to the object, but peeling of reinforcing fibers and loss of resin occur in the periphery of the hole, causing cracks in the fastening portion
Solution Approach 1:
A resin-rich layer is formed on the surface of the FRP member before the boring process. This preliminary preparation creates a protective zone that prevents fiber peeling and resin loss during subsequent hole drilling, thereby maintaining fastening portion integrity while enabling fastening operations
Solution Approach 2:
The resin-rich layer acts as an intermediary between the drilling tool and the FRP member's reinforcing fibers. It absorbs the mechanical stress and cutting forces during boring, preventing direct contact between the tool and the fibers, thus avoiding fiber peeling and resin loss
2Ease of manufacture
If the FRP member is subjected to the boring process, then the hole can be formed for fastening, but peeling of reinforcing fibers and loss of resin occur, compromising the strength of the fastening portion
Solution Approach 1:
The resin-rich layer is formed in advance on the FRP member surface before boring. This pre-formed protective layer ensures that when the hole is drilled, the reinforcing fibers and resin are protected from peeling and loss, thereby maintaining the strength of the fastening portion while enabling easy hole formation
Solution Approach 2:
The resin-rich layer serves as a cushioning layer that absorbs and distributes the mechanical stresses generated during the boring process. This beforehand cushioning prevents direct stress concentration on the reinforcing fibers and resin, avoiding peeling and strength degradation in the fastening portion
Data Source
Figure 1A~1B
Figure 2
Figure 3A~3B
AI summary
A composite material member in which a resin-rich layer, having a lower fiber content than an FRP layer, is formed in at least a partial region of a surface of the FRP layer, and a hole is bored so as to penetrate the FRP layer and the resin-rich layer.