Roof Window Flashing Member with Segmented Bend Design
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Solution Overview
Problem
Existing flashing members for roof windows, made from high-carbon-footprint materials like virgin metal alloys, face issues with deformation and material rupture when using recycled metals, leading to watertightness and durability concerns, especially in deep roof installations.
Innovation Solution
Incorporating a planar third section into the flashing member design with two bends, allowing for distributed deformation and material redistribution, which reduces the risk of cracking and over-stretching, and using recycled aluminum alloys with specific elongation properties for enhanced durability and water drainage properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single bend is used to connect the first section and second section, then the flashing member structure is simple, but the material deformation is concentrated causing cracks or holes especially when using recycled aluminum
Solution Approach 1:
The single bend is segmented into two separate bends connected by a third section. This divides the concentrated deformation into two separate deformation zones, reducing the stress concentration at each bend and preventing material rupture while maintaining structural integrity and watertightness
Solution Approach 2:
A third section extending in a direction perpendicular to both the first and second sections is introduced, adding a spatial dimension to the structure. This creates a three-dimensional configuration that distributes deformation across multiple planes and reduces stress concentration
2Object-generated harmful factors
If recycled aluminum alloys are used to reduce carbon footprint, then environmental impact is reduced, but material ductility is lower leading to cracking and holes
Solution Approach 1:
The deformation path is segmented into two bends, reducing the total deformation required at each bend location. This allows recycled aluminum alloys with lower ductility to accommodate the deformation without cracking or forming holes
Solution Approach 2:
The geometry parameters of the flashing member are changed by introducing the third section and two bends, which modifies the deformation distribution and reduces the strain concentration, enabling the use of recycled materials with different mechanical properties
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables the creation of flashing members with a lower carbon footprint that maintain watertightness and durability, effectively addressing deformation issues and material limitations, particularly in deep roof installations and under high water loads.
Implementation Method 1
the deformation is distributed on two bends, at a distance from each other. This not only means that the deformation required at each bend is reduced, but also that material can be drawn from a larger area of the respective sheet materials, thus reducing the risk of rupturing the sheet materials
Data Source
AI summary
A flashing member (30, 32, 33) for a roof window (1) and a method for making a flashing member is disclosed. The flashing member is made from a sheet material and comprises an elongate main element (301) and at least one end element (302), attached to the main element (301) at one end by a folded seam connection (303). The main element (301) comprises a first section (3011) extending along a length axis (L) and a height axis (H) of the flashing member, a second section (3012) extending along the length axis and a width axis (W), and a planar third section (3013) extending between the first section (3011) and the second section (3012). The method comprises bending a first piece of sheet material twice along two parallel lines to form the third section of the main element and possibly compressing the folded seam connection into a flat lock seam.