Polyurethane Wear Pad Reinforcement for Strain Distribution
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Solution Overview
Problem
Current bolt-on wear pad designs for road construction and maintenance vehicles experience premature failure due to localized areas of high tensile strain when subjected to shear forces, as a small portion of the polyurethane material is bonded to steel reinforcement members, leading to crack development and diminished rigidity.
Innovation Solution
A wear pad design with a reinforcing member embedded within the polyurethane pad, where the bonded surface area of the reinforcing member is significantly greater than 50% of the contact patch, secured using a chemical bond and fasteners, to distribute strain energy and prevent crack propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a small portion of polyurethane material is bonded to steel reinforcement members, then the wear pad can be easily manufactured and installed, but the wear pad experiences localized areas of high tensile strain leading to premature failure
Solution Approach 1:
The patent applies partial action by bonding the reinforcing member to only a portion of the wear pad surface (greater than 50% of the contact patch area) rather than the entire surface. This partial bonding approach distributes strain energy more effectively across the bonded region while maintaining ease of manufacture and installation, thereby improving reliability without requiring complete surface bonding
2Reliability
If the bonded surface area of the reinforcing member is increased to greater than 50% of the contact patch, then localized strain and strain energy are reduced, but the complexity of the manufacturing process increases
Solution Approach 1:
The patent applies local quality by concentrating the bonding function in a specific region of the wear pad (the contact patch area) rather than distributing it uniformly throughout. The reinforcing member is bonded to a localized area greater than 50% of the contact patch, which strategically addresses strain distribution where it is most needed while avoiding unnecessary complexity in non-critical regions
3Strength
If the reinforcing member is embedded within the polyurethane pad with large bonded surface area, then the rigidity and durability are improved, but the difficulty of securing the reinforcing member during manufacturing increases
Solution Approach 1:
The patent applies preliminary action by positioning and securing the reinforcing member within the mold cavity before the polyurethane material is introduced and cured. This preliminary placement ensures proper alignment and bonding surface area (greater than 50% of contact patch) is achieved before the material sets, making the manufacturing process more controlled and repeatable while achieving the desired strength 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 increased bonded surface area reduces localized strain and strain energy, leading to extended wear pad lifespan and improved rigidity, preventing premature failure and enhancing the durability of the wear pad under tractive efforts.
Implementation Method 1
A liquid polyurethane is introduced into the mold cavity, and the liquid polyurethane is cured to form a solid polyurethane that is bonded to the second surface region
Data Source
AI summary
A wear pad that is adapted to be attached to a grouser plate of a track-type machine includes a polyurethane pad having a first surface region that is adapted to engage a contact patch between the polyurethane pad and a ground region, the first surface region having a first area. A reinforcing member is at least partially embedded within the polyurethane pad and has a second surface region that faces the first surface region, wherein a second area of the second surface region is greater than fifty percent of the first area.