1xN Multi-Strand Tire Cable for Obstacle Energy Absorption
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Solution Overview
Problem
Tires for civil engineering vehicles face issues with perforations and cable ruptures when encountering obstacles, leading to reduced lifespan and increased risk of corrosive agent entry into the crown reinforcement.
Innovation Solution
A cable with a 1xN structure, comprising a single layer of N strands wound helically, each with two layers of metal wires, is developed. This cable has a structural elongation of at least 3.00% and a mechanical resistance of at least 50% of the metal wires exceeding 3500-2000 times their diameter, with a low elastic modulus, allowing for reduced rigidity and increased energy absorption during deformations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cable uses high mechanical strength wires to resist obstacles, then the breaking force increases, but the cable becomes too rigid and experiences more breaks due to inability to conform to obstacles
Solution Approach 1:
The invention changes the physical parameters of the cable by controlling the structural elongation As to be between 2.00% and 4.00% and the elastic modulus MC to be between 100 and 137 GPa. This optimization allows the cable to have sufficient rigidity to resist obstacles while maintaining enough flexibility to conform to obstacles, resolving the contradiction between breaking force and breakage resistance
Solution Approach 2:
The cable comprises a composite structure with N strands wound helically, each strand having M internal wires and P external wires with different helical winding patterns. This composite structure combines wires with high mechanical strength (≥3500-2000xD Pa) to achieve both high breaking force and controlled flexibility through the multi-layer configuration
2Strength
If the cable is made more rigid to resist deformations from obstacles, then the breaking force increases, but the force opposing obstacles increases leading to more punctures
Solution Approach 1:
By optimizing the structural elongation As to 2.00-4.00% and elastic modulus MC to 100-137 GPa, the cable achieves a balance where it can resist deformation forces while maintaining low enough rigidity to conform to obstacles, thereby reducing the force opposing obstacles and minimizing puncture risk
Solution Approach 2:
The cable's helical winding structure with controlled elongation properties allows it to dynamically adapt its rigidity when encountering obstacles, conforming to the obstacle shape while maintaining structural integrity, thus reducing the opposing force and puncture risk
3Strength
If the cable uses high elastic modulus to maintain structural integrity, then the breaking force increases, but the structural elongation decreases reducing energy absorption capacity
Solution Approach 1:
The invention optimizes the elastic modulus MC to be between 100 and 137 GPa and structural elongation As to be between 2.00% and 4.00%, achieving a balance where the cable maintains sufficient structural integrity while absorbing deformation energy from obstacles, preventing cable breaks
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 cable effectively reduces the number of perforations and breaks, extending the tire's lifespan by absorbing deformations and reducing the force opposing obstacles, thereby minimizing the risk of puncturing and enhancing the cable's durability.
Implementation Method 1
The cable has a structural elongation As determined by applying the ASTM D2969-04 of 2014 standard such that As ≥ 3.00% and satisfies MC ≤ 127 with MC = 200 x cos⁴(α) x [M x (D1/2)² x cos⁴(β) + P x (D2/2)² x cos⁴(γ)] / [M x (D1/2)² + P x (D2/2)²], where the MC indicator represents the elastic modulus of the cable
Data Source
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AI summary
The extracted cable (60') has a 1xN structure comprising a single layer (61) of N strands (62) wound in a helix. Each strand (62) has two layers of metal wires (F1, F2) with diameters D1 and D2. The extracted cable (60') has a structural elongation As' ≥1.00 % and a modulus of elasticity MC' ≤ 80 GPa. The mechanical resistance of at least 50% of the metal wires (F1, F2) with diameters D1 and D2, measured in accordance with standard ASTM D2969-04, is greater than or equal to 3,500-2,000 x D1 for a metal wire with diameter D1 and greater than or equal to 3,500-2,000 x D2 for a metal wire with diameter D2.