Mitre Gate Leaf Cylindrical Plating Stress Concentration
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Solution Overview
Problem
Prior art mitred door leaves experience high stress concentrations due to the alternation of compressive forces along lines passing through horizontal and vertical plates, reducing fatigue strength and service life.
Innovation Solution
A mitred door leaf with a cylindrical plating and uprights integral to the plating, where the uprights extend along the generatrix of the cylinder, and support elements with bearing surfaces tangent to the plating, distribute forces and reduce stress concentrations by directly taking up compression forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If horizontal beams and vertical stiffeners are used to withstand liquid pressure, then the leaf can resist the distributed pressure, but stress concentrations occur at the junctions between components, reducing fatigue strength
Solution Approach 1:
The plating is formed with a cylindrical curvature instead of being flat, which allows the compressive forces to be distributed along the curved surface and transmitted more uniformly to the uprights, reducing stress concentrations at component junctions while maintaining structural strength against liquid pressure
Solution Approach 2:
The uprights are made integral with the plating rather than being separate joined components, eliminating the stress concentrations that occur at weld joints or connection points between horizontal beams and vertical stiffeners, thereby improving fatigue strength while maintaining pressure resistance
2Force
If compressive forces are transmitted alternately through horizontal and vertical plates, then the leaf structure can support the load, but high stress concentrations are generated between components
Solution Approach 1:
The cylindrical shape of the plating redirects the alternately transmitted compressive forces into a more continuous distribution pattern along the curved surface, allowing forces to flow smoothly to the uprights without concentrating at the junctions between horizontal and vertical components
Solution Approach 2:
The invention removes the horizontal beams and vertical stiffeners that create stress concentrations, replacing them with a simplified structure where integral uprights directly support the curved plating, thereby eliminating the harmful stress concentration points while maintaining force transmission capability
Data Source
Figure 1
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AI summary
A leaf for a mitre gate is provided. The leaf for a mitre gate may include: a skin plate intended for withstanding a pressure exerted by a liquid; and at least two uprights respectively located on either side of the skin plate, the uprights being secured to the skin plate. The skin plate is in the overall shape of a cylinder portion, the longitudinal axis of the cylinder being essentially parallel to the uprights. Each upright extends overall according to a generatrix of the cylinder. Each upright includes at least one bearing element, arranged to project relative to the skin plate and each bearing element includes a bearing surface, for supporting the bearing element against a lock wall or another leaf of the mitre gate. The bearing surface of each bearing element is aligned with a plane that is tangential to the skin plate.