Extruded Polymer Skirting Panel Impact Resistance
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Solution Overview
Problem
Mobile home skirting panels are prone to damage from grass cutting string trimmers due to their vulnerability to impact from strings with diameters up to 0.105 inches, which existing panels fail to adequately withstand.
Innovation Solution
The skirting panel is made from an extruded polymer material with specific dimensions and features, including an embossed stucco finish, grooves with vents, and carefully designed transitions between panel portions, which enhance resistance to string trimmer damage by eliminating fracture paths and reducing stress concentration points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional smooth skirting panels are used, then manufacturing is simple and cost-effective, but the panels are vulnerable to damage from string trimmer impact
Solution Approach 1:
The panel surface features localized geometric patterns (recesses, protrusions, and embossed designs) rather than uniform smooth surfaces. These localized structural variations create fracture paths that deflect impact energy, improving impact resistance while maintaining overall panel simplicity and manufacturability through extrusion processes.
Solution Approach 2:
The panel incorporates curved and rounded geometric features including recesses with rounded corners, embossed patterns with smooth transitions, and radiused edges. These curved surfaces distribute impact forces more effectively compared to sharp corners, reducing stress concentration points and improving resistance to string trimmer damage.
2Strength
If the panel thickness is increased to improve impact resistance, then strength improves, but weight and material consumption increase
Solution Approach 1:
The panel is divided into multiple geometric zones including recesses, protrusions, and embossed patterns that create a segmented structure. This segmentation allows the panel to absorb and distribute impact energy across multiple fracture paths, achieving improved impact resistance without requiring increased material thickness.
Solution Approach 2:
The panel utilizes a single polymer material (such as PVC or polyethylene) with optimized geometric composition rather than composite material layers. The geometric complexity is achieved through extrusion of the base polymer with integrated design features, avoiding the need for thicker panels or multi-material constructions.
3Strength
If geometric patterns are added to the panel surface, then fracture paths are eliminated and impact resistance improves, but manufacturing complexity increases
Solution Approach 1:
The geometric patterns incorporate rounded corners, smooth transitions, and continuous curved surfaces that are well-suited for extrusion manufacturing. These curved features eliminate sharp corners that would create stress concentration points, while the continuous nature of the curves allows them to be formed efficiently in the extrusion process without requiring complex multi-step manufacturing.
Solution Approach 2:
The panel design utilizes specific geometric parameters including recess depths of 0.020-0.040 inches, protrusion heights of 0.010-0.030 inches, and embossed pattern depths of 0.015-0.035 inches. These optimized parameters balance fracture resistance with manufacturability, ensuring the geometric features are sufficiently complex to deflect fracture paths while remaining within the capabilities of standard extrusion processes.
Data Source
AI summary
A panel for skirting of a mobile home comprises an extrusion of a polymer material having a thickness of between 0.040 inches and 0.048 inches. The panel has an exterior face comprising a plurality of panel portions separated by grooves formed in the face. Each of the grooves is defined by spaced apart sidewalls arranged generally perpendicular to adjoining panel portions and a groove base extending between the spaced apart side walls. The groove base has vents. On the exterior face, the side wall transitions to the adjoining panel portion with a radius of between about 5/32 inches and about 7/32 inches. On the exterior face, the distance between the groove sidewalls is between about ¼ inches and about 9/32 inches. The exterior face has an embossed stucco finish. The panel is resistant to damage from grass cutting string trimmers having string diameter of less than 0.105 inches.