Aircraft Tire Tread Composition for Chevron Cut Resistance
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Solution Overview
Problem
Aircraft tires face challenges in resisting chevron cuts during landing, particularly at varying temperatures, and existing compositions do not adequately address tear resistance and production viscosity issues.
Innovation Solution
The aircraft tire tread composition includes an elastomeric matrix with isoprene elastomer and a copolymer of butadiene and styrene, reinforced with carbon black and a hydrocarbon resin with specific aromatic and cycloaliphatic monomers, along with a crosslinking system, to enhance tear resistance and processability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional aircraft tire tread compounds made from natural rubber and carbon black are used, then satisfactory mechanical properties are achieved, but tear resistance during landing is insufficient
Solution Approach 1:
The patent modifies the chemical composition parameters of the tread compound by incorporating specific elastomers (natural rubber, synthetic polyisoprene, polybutadiene) in optimized ratios, along with carbon black and sulfur vulcanization system. This parameter optimization enhances the compound's tear resistance and elasticity to withstand chevron cuts during aircraft landing.
Solution Approach 2:
The patent creates a composite material system combining multiple elastomers (natural rubber, synthetic polyisoprene, polybutadiene) with carbon black filler and sulfur crosslinking agents. This composite structure leverages the complementary properties of each component: natural rubber provides elasticity, synthetic polyisoprene enhances tear resistance, polybutadiene improves abrasion resistance, and carbon black reinforces the matrix, collectively resisting chevron cuts during landing.
2Reliability
If existing tread compositions are used, then basic mechanical properties are maintained, but resistance to chevron cuts at varying temperatures is inadequate
Solution Approach 1:
The patent optimizes the compositional parameters to ensure temperature stability. The specific ratio of elastomers and the sulfur vulcanization system maintain the compound's structural integrity across a wide temperature range, preventing chevron cuts both in cold conditions (enhancing elasticity) and hot conditions (maintaining strength).
Solution Approach 2:
The patent tailors the local chemical properties of the tread compound by selecting specific elastomer types and ratios that provide temperature-dependent performance: natural rubber and synthetic polyisoprene contribute to cold-weather flexibility, while the carbon black-reinforced matrix maintains heat resistance during high-speed landing, creating localized property optimization throughout the tread structure.
3Ease of manufacture
If traditional tread compounds are used, then production is feasible, but viscosity before curing is not optimized for easier production
Solution Approach 1:
The patent adjusts the compositional parameters, particularly the ratio of elastomers and the selection of sulfur as the vulcanization system, to optimize the viscosity of the compound before curing. This parameter optimization ensures the compound remains sufficiently fluid during mixing and molding operations, facilitating easier production while maintaining the desired final 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 composition significantly improves tear resistance at both low and high temperatures and reduces viscosity, facilitating easier production and enhanced performance under demanding aircraft tire conditions.
Implementation Method 1
at least one hydrocarbon resin mainly composed of units derived from aromatic and cycloaliphatic monomers, said resin having an aromatic proton content of between 0 and 12%, an ethylenic proton content greater than 3%
Implementation Method 2
a crosslinking system
Implementation Method 3
a reinforcing filler comprising mainly carbon black
Implementation Method 4
a crosslinking system
Data Source
AI summary
The present invention relates to an aircraft tire in which the tread comprises a composition based on at least one elastomer matrix comprising 20 to 100 phr of isoprene elastomer and 0 to 80 phr of a styrene-butadiene copolymer; a reinforcing filler mainly containing carbon black; 1 to 30 phr of at least one hydrocarbon resin mainly composed of aromatic and cycloaliphatic monomer units, said resin having an aromatic proton content of 0 to 12%, an ethylenic proton content of more than 3%, a number average molecular weight of more than 500 g/mol, and a polydispersity index of more than 2; and a crosslinking system.