Spiral Reinforcement for Substrate Aperture Shear Resistance
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Solution Overview
Problem
Substrates with cross-ply laminates are prone to tearing, shearing, or cracking around holes or apertures due to premature exceeding of strength and stiffness, particularly in orthotropic properties.
Innovation Solution
A system and method involving a rotary device, guides, and a form to wind reinforcement materials around the substrate, enhancing shear and tear characteristics by applying a spiral reinforcement directly to the substrate or around apertures, using guides to control the placement and thickness of the reinforcement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If cross-ply laminates are used to enhance tear resistance, then the substrate's resistance to tearing parallel to each ply is improved, but the substrate becomes susceptible to tearing, shearing, or cracking around holes or apertures due to premature exceeding of strength and stiffness
Solution Approach 1:
The patent applies spiral reinforcement specifically around holes and apertures in the substrate, rather than uniformly across the entire substrate. This localized reinforcement approach addresses the specific weakness at hole perimeters while maintaining the overall structural integrity provided by the cross-ply laminate construction.
Solution Approach 2:
The patent combines cross-ply laminate layers with spiral reinforcement elements to create a composite structure. The spiral reinforcement is integrated with the laminate layers through bonding, creating a multi-component composite that leverages the tear resistance of the cross-ply structure and the localized strength of the spiral reinforcement around holes.
2Strength
If cross-ply laminates are used to improve substrate strength, then the substrate's overall strength is enhanced, but the orthotropic properties cause premature exceeding of strength and stiffness leading to failure
Solution Approach 1:
The spiral reinforcement is strategically positioned around holes and apertures where stress concentration occurs, providing enhanced strength precisely where needed. This local enhancement compensates for the orthotropic weakness in the cross-ply structure without requiring uniform reinforcement throughout the entire substrate.
Solution Approach 2:
The spiral reinforcement is applied during the manufacturing process, preferably before the substrate is put into service. This preliminary reinforcement ensures that the weakness at hole perimeters is addressed in advance, preventing premature failure under future loading conditions.
Data Source
AI summary
A system for reinforcing a substrate includes a rotary device, a first guide connected to the rotary device, and a form positioned against the first guide. A reinforcement is supplied to wind around the form and against the first guide. A method for reinforcing a substrate includes connecting a first guide to a rotary device and positioning a form on a first side of the first guide. The method further includes winding a reinforcement around the form and against the first side of the first guide.