Composite Joint Structure With Anisotropic Fibers for Tensile Locking
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Solution Overview
Problem
Existing composite joint structures face challenges in maintaining the joined state under tensile loads, particularly when the fiber directions of reinforcement fibers align with the load direction, leading to potential breakage and instability.
Innovation Solution
A joint member structure featuring a main body part and a joint part with a bulging section that opposes the load direction, incorporating an anisotropic orientation pattern of reinforcement fibers, which differs from the load direction, to enhance tensile strength and maintain the joined state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If reinforcement fibers are aligned with the load direction to maximize strength, then tensile strength is improved, but the fibers become easily torn and the joined state cannot be maintained
Solution Approach 1:
The joint part is designed with asymmetric fiber orientation where the fiber direction is intentionally set at an angle different from the load direction. This asymmetric arrangement prevents fibers from aligning directly with the tensile load, thereby avoiding fiber tear while maintaining joint strength through the bulging geometric engagement.
Solution Approach 2:
The joint part incorporates a bulging portion with curved geometry that protrudes into the other joint member. This curved/spheroidal feature creates a mechanical interlock that resists tensile forces without requiring fibers to bear the full load directly, thus preventing fiber tear while maintaining the joined state.
2Reliability
If adhesive is used to join composites to secure against tensile load, then the joined state is maintained, but the dealing of adhesive becomes complicated requiring pretreatment
Solution Approach 1:
The invention extracts and eliminates the adhesive component from the joining system. Instead of using adhesive to secure the joined state, the design relies purely on the mechanical interlock formed by the bulging portion of one joint member fitting into the recessed portion of the other, thereby simplifying the process by removing adhesive pretreatment requirements.
Solution Approach 2:
The invention replaces the chemical bonding mechanism (adhesive) with a mechanical interlocking system. The bulging portion and recessed portion create a physical engagement that resists tensile loads through geometric constraints rather than chemical adhesion, eliminating the need for adhesive application and pretreatment.
Data Source
AI summary
A joint member is formed of a composite including reinforcement fibers and resin. The joint member is configured to be joined with another joint member to form a joint structure capable of enduring a tensile load in a load direction in which the joint member and the other joint member are separated from each other at a joined portion of the joint structure in a longitudinal direction of the joint member. The joint member includes a main body part and a joint part connected with the main body part at an end part of the main body part in the longitudinal direction of the joint member. The joint part has an orientation pattern having anisotropy such that fiber directions of the reinforcement fibers included in the joint part include a fiber direction different from the longitudinal direction of the joint member.