Relative Stiffness Fasteners Buckling Resistance
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Solution Overview
Problem
Mechanical fastening systems face issues with buckling under applied tension, leading to misalignment of hook elements and reduced performance due to compressive forces, which affects the engagement between the hook and loop components.
Innovation Solution
A fastening member design with distinct stiffness zones, where the fastening element zone has a higher stiffness than the panel and intermediate zones, providing increased resistance to buckling and improved engagement efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the fastening member is made more flexible to ease attachment, then ease of operation is improved, but resistance to buckling under tension deteriorates
Solution Approach 1:
The fastening member is divided into distinct zones with different stiffness characteristics: a panel region with higher extensibility for ease of attachment, and an end region with increased stiffness to resist buckling under tension. This segmentation allows each zone to perform its specific function optimally.
Solution Approach 2:
Different portions of the fastening member are given different mechanical properties. The panel region is designed to be more extensible while the end region is designed to be stiffer, creating local quality variations that resolve the contradiction between flexibility for attachment and stiffness for buckling resistance.
2Reliability
If the fastening member is made stiffer to resist buckling, then reliability is improved, but ease of attachment deteriorates
Solution Approach 1:
The fastening member is segmented into regions with different stiffness levels, allowing the end region to be stiff for reliable fastening while the panel region remains flexible for easy attachment.
Solution Approach 2:
The fastening member exhibits local quality variations where the end region has increased stiffness for reliability while the panel region maintains flexibility for ease of operation.
Data Source
Figure 1A
Figure 1B
Figure 2A~2C
AI summary
A fastening member has an inboard end and an outboard end and a panel region, an end region, and a fastening element. The panel region has a proximal edge and a distal edge. The panel region is disposed adjacent to the inboard end and is more extensible than the end region. The end region is disposed adjacent to the outboard end. The end region has a fastening element zone having a first stiffness and an intermediate zone having a second stiffness. The first stiffness is greater than the second stiffness. The intermediate zone is disposed between the fastening element zone and the panel region adjacent to the distal edge. The fastening element is disposed in the end region and defines the fastening element zone.