Rubber Sheet Fatigue Strength via Perpendicular Crumb Rubber Orientation
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Solution Overview
Problem
The addition of crumb rubber to rubber compositions can lead to a decrease in tensile strength at break and fatigue life, which are critical properties for rubber products like tires.
Innovation Solution
A rubber sheet made from a composition based on an elastomer matrix and crumb rubber, where the crumb rubber particles are substantially perpendicularly oriented to the longitudinal direction of the rubber sheet, thereby enhancing fatigue strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If crumb rubber is added to rubber compositions, then sustainable material content is increased, but tensile strength at break decreases
Solution Approach 1:
The patent changes the orientation parameter of crumb rubber particles from random to perpendicular alignment relative to the longitudinal direction, which fundamentally alters the mechanical properties of the composite material. This parameter change allows the material to maintain higher tensile strength while incorporating crumb rubber, thus resolving the contradiction between sustainable material content and tensile strength.
Solution Approach 2:
The patent creates a composite rubber material with a specific microstructure where crumb rubber particles are perpendicular to the longitudinal direction within an elastomer matrix. This composite structure optimizes the distribution and orientation of reinforcement particles, allowing the material to achieve both sustainability goals and mechanical strength requirements simultaneously.
2Quantity of substance
If crumb rubber is added to rubber compositions, then sustainable material content is increased, but fatigue life decreases
Solution Approach 1:
The patent changes the orientation parameter of crumb rubber particles from random to perpendicular alignment, which fundamentally improves the material's fatigue resistance. This specific orientation arrangement reduces stress concentration and crack propagation under cyclic loading, allowing the material to maintain long fatigue life while incorporating high amounts of sustainable crumb rubber content.
Solution Approach 2:
The patent develops a composite rubber material with optimized microstructure where crumb rubber particles are perpendicular to the longitudinal direction. This composite structure enhances the material's ability to withstand cyclic stresses, thereby extending fatigue life while maintaining high sustainable material content.
3Ease of manufacture
If crumb rubber particles are randomly oriented, then manufacturing is simple, but fatigue strength is reduced
Solution Approach 1:
The patent changes the orientation parameter of crumb rubber particles from random to perpendicular alignment relative to the longitudinal direction. This parameter change significantly improves fatigue strength by optimizing stress distribution within the material, while the manufacturing process remains relatively straightforward using conventional rubber processing techniques with added orientation control.
Solution Approach 2:
The patent applies preliminary orientation action to crumb rubber particles during the compounding or molding process, aligning them perpendicular to the longitudinal direction before final product formation. This preliminary orientation ensures optimal mechanical properties are achieved during manufacturing without requiring complex post-processing steps.
Data Source
AI summary
A rubber sheet allowing unexpectedly improved fatigue strength is made of a rubber composition based on at least an elastomer matrix and a crumb rubber comprising crumb rubber particles substantially perpendicularly oriented to a longitudinal direction of the rubber sheet.