Double-Layer Multi-Strand Cable for High Energy Absorption
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Solution Overview
Problem
Tires for civil engineering vehicles face issues with perforations and cable breaks due to obstacles, leading to reduced lifespan and efficiency, as existing cables have either high breaking force with low elongation or high elongation with low breaking force, resulting in low rupture energy.
Innovation Solution
A two-layer multi-strand cable with an internal layer of K≥1 strands wound helically around a main axis and an outer layer of L>1 strands, featuring a tangent modulus between 35 to 80 GPa and a breaking energy indicator greater than 40 MJ/m³, designed to deform effectively under stress, reducing stiffness and increasing energy absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cable uses high breaking force with low elongation, then the breaking force is improved, but the cable rigidity increases making it more susceptible to breaks under deformation
Solution Approach 1:
The patent applies parameter changes by optimizing the tangent modulus to a specific range (35-80 GPa) and breaking energy indicator (>40 MJ/m³), transforming the cable from being too rigid to having optimal flexibility. This resolves the contradiction by adjusting physical parameters to achieve both sufficient strength and improved deformability under stress.
2Adaptability or versatility
If the cable uses high elongation at break with low breaking force, then the deformability is improved, but the breaking force decreases resulting in low rupture energy
Solution Approach 1:
The patent simultaneously optimizes multiple parameters - tangent modulus (35-80 GPa) and breaking energy indicator (>40 MJ/m³) - to achieve the desired balance. This multi-parameter optimization resolves the contradiction by ensuring both adequate elongation and sufficient breaking force are achieved together.
3Force
If the cable rigidity is increased to resist deformation from obstacles, then the resistance to deformation is improved, but the cable becomes more prone to breaks and perforations
Solution Approach 1:
The patent changes the rigidity parameter (tangent modulus) to an optimal range (35-80 GPa) that provides sufficient resistance to deformation from obstacles while maintaining cable flexibility to avoid breaks. This parameter optimization resolves the contradiction between resistance to deformation and break resistance.
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 reduces the number of perforations and breaks, extending tire life by absorbing energy through its high breaking energy and low tangent modulus, allowing it to hug obstacles rather than resisting deformation, thus minimizing puncture risks.
Implementation Method 1
the cable reduces the number of perforations and breaks, extending tire life by absorbing energy through its high breaking energy and low tangent modulus, allowing it to hug obstacles rather than resisting deformation
Data Source
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AI summary
The invention relates to a double-layer multi-strand cable (50; 60) comprising an inner layer (CI) of the cable, consisting of K≥1 inner strand(s) (TI) that are helically wound about a main axis (A), the one or more inner strands (TI) consisting of a layer (C1) of metal wires (F1) and comprising Q>1 metal wires (F1) that are helically wound about an axis (B); and an outer layer (CE) of the cable, consisting of L>1 outer strands (TE) that are wound about the inner layer (CI) of the cable, each outer strand (TE) consisting of a layer (C1') of metal wires (F1') and comprising Q'>1 metal wires (F1') that are helically wound about an axis (B'). The cable (50; 60) has a tangent modulus E2 of 35 to 80 GPa. The energy-at-break index Er of the cable (50; 60) is strictly greater than 40 MJ/m3.