Reinforced Hose With Gradient Tensile Strength Layers
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Solution Overview
Problem
Conventional high-pressure reinforced hydraulic hoses face a trade-off between burst strength and fatigue resistance, where increasing burst strength compromises flexibility and fatigue resistance, and existing designs do not adequately address long-term fatigue resistance.
Innovation Solution
A multi-layer hose structure with a ductile first reinforcing layer having a lower tensile strength and a second reinforcing layer with a higher tensile strength, where the first layer resists fatigue and the second layer supports ultimate load, using alternating layers of spiraled or braided steel wire reinforcement materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If additional reinforcing material and/or layers are added to increase burst strength, then burst strength is improved, but flexibility deteriorates
Solution Approach 1:
The patent applies different tensile strengths to different layers of reinforcement material. The inner layer uses material with a first tensile strength optimized for flexibility and fatigue resistance, while the outer layer uses material with a second tensile strength optimized for burst strength. This local differentiation of material properties allows each layer to perform its specific function without compromising the other attributes.
2Strength
If tensile strength of each layer of reinforcement material is universally increased to improve burst strength, then burst strength is improved, but fatigue resistance deteriorates
Solution Approach 1:
The patent specifies that the reinforcement material in the inner layer has a first tensile strength and the reinforcement material in the outer layer has a second tensile strength, where the second tensile strength is greater than the first tensile strength. This creates a gradient structure where the inner layer maintains lower stress levels during cyclic loading (improving fatigue resistance) while the outer layer provides the necessary burst strength.
3Strength
If reinforcement material with higher tensile strength is used to improve burst strength, then burst strength is improved, but long term fatigue resistance deteriorates
Solution Approach 1:
The patent changes the tensile strength parameter of the reinforcement material across different layers. By establishing a tensile strength gradient (first tensile strength in inner layer, second tensile strength in outer layer where second > first), the patent optimizes both burst strength and fatigue resistance. The inner layer's lower tensile strength reduces stress concentration during fatigue cycling, while the outer layer's higher tensile strength ensures adequate burst strength.
Data Source
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AI summary
A reinforced hose (10) according to an embodiment of the present invention includes a first reinforcing layer (14) having a reinforcement material with a first tensile strength. A second reinforcing layer (18) overlays the first reinforcing layer (14) and includes a reinforcement material with a second tensile strength. The second tensile strength is substantially greater than the first tensile strength. In another embodiment of the present invention, a reinforced hose (10) includes a first reinforcing layer (14) including a reinforcement material having a first level of fatigue resistance and a second reinforcing layer (18) overlaying the first reinforcing layer (14) and including a reinforcement material having a second level of fatigue resistance. The first level of fatigue resistance is substantially greater than the second level of fatigue resistance.