Fiber-Reinforced Resin Joint Positioning for Stress Reduction
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Solution Overview
Problem
Fiber-reinforced resin structure bodies used in automotive components face challenges in maintaining strength against stress, particularly at joints where stress concentrations can lead to breaking.
Innovation Solution
A fiber-reinforced resin structure body design where two members are joined with a joint positioned inwardly, away from the outer surface, reducing stress concentration and enhancing strength by distributing loads effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the joint is positioned at or near the outer surface of the fiber-reinforced resin members, then the manufacturing and assembly process is simplified, but the stress concentration increases leading to joint failure under load
Solution Approach 1:
The joint position is moved from the outer surface (2D surface location) to the interior volume of the member (3D internal location). This dimensional transition allows the joint to be positioned away from stress-concentration zones at the surface while maintaining manufacturing feasibility through internal bonding processes.
Solution Approach 2:
Instead of placing the joint at the conventional outer surface location for ease of assembly, the invention inverts the approach by positioning the joint internally within the member thickness. This reversal of the conventional joint location eliminates stress concentration at the outer surface while preserving structural integrity.
2Strength
If the joint is positioned inward away from the outer surface, then stress concentration is reduced and joint strength is improved, but the manufacturing complexity increases
Solution Approach 1:
The joint structure merges the first and second fiber-reinforced resin members into a unified bonded structure within the internal region. By combining the members at an internal location rather than surface-level assembly, the design achieves enhanced strength while the bonding process itself integrates the complexity into a single manufacturing step.
3Reliability
If the joint is positioned inward away from the outer surface, then the likelihood of joint failure under stress is reduced, but the manufacturing process becomes more complex
Solution Approach 1:
The joint is prepared and positioned in advance within the internal region of the member before final assembly. This preliminary positioning of the joint structure internally allows for controlled bonding conditions that enhance reliability while managing manufacturing complexity through pre-positioning.
Data Source
AI summary
A fiber-reinforced resin structure body includes a first member and a second member. The first member is made of a fiber-reinforced resin; and the second member is made of a fiber-reinforced resin and forming a closed space by being joined to the first member. One or both of the first member and the second member includes a side wall having two side surfaces located on both sides in a direction of a load loaded on a swing end of the fiber-reinforced resin structure body. A joint joining the first member and the second member together is provided more on an inside than an outer wall surface located on an opposite side to the closed space out of the two side surfaces is.