Filament Wound Resin Sleeve with Acute Angle Layer
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Solution Overview
Problem
Internal pressure containers with fiber-reinforced resin sleeves experience peeling issues between layers due to parallel interfaces under axial load, leading to mechanical strength deficiencies and increased size or cost when attempting to enhance durability.
Innovation Solution
A manufacturing method involving continuous filament winding with specific layer configurations: forming a first layer perpendicular to the mandrel, a second layer at an acute angle, and a third layer only on the end portions, to create a structure where the interface between layers is not parallel to the axial load, enhancing mechanical strength without increasing size or weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thickness of the end portion is increased to 40 mm or more, then the mechanical strength is improved, but the size of the apparatus is enlarged
Solution Approach 1:
The patent applies composite material structure by combining fiber-reinforced resin with specific layer configurations. The sleeve consists of multiple layers with different fiber orientations: a first layer wound perpendicular to the axis, a second layer wound at an acute angle, and optionally a third layer at the end portion. This composite layer structure provides enhanced mechanical strength through the synergistic effect of different fiber orientations resisting internal pressure, without requiring uniform thickness increase throughout the sleeve.
Solution Approach 2:
The patent implements local quality by applying different layer configurations to different portions of the sleeve. The end portion (where closure lids are attached) receives special attention with the third layer wound perpendicular to the axis to provide localized reinforcement. This allows the end portion to have enhanced strength characteristics specifically where needed, rather than uniformly increasing the thickness of the entire sleeve, thus avoiding overall size enlargement.
2Strength
If the distance from the closure lid to the end portion is increased to 150 mm or more, then the mechanical strength is improved, but the ease of operation deteriorates
Solution Approach 1:
The composite layer structure with specific fiber orientations provides the necessary mechanical strength to maintain closure lids securely without requiring excessive distance from the end portion. The combination of layers wound at different angles creates a stress distribution pattern that reinforces the closure lid attachment area, allowing the functional distance to be reduced to 150 mm or less while maintaining durability.
3Strength
If the thickness of the end portion is increased, then the mechanical strength is improved, but the weight of the sleeve is increased
Solution Approach 1:
The patent applies local quality by concentrating reinforcement only where needed - specifically at the end portion with the third layer wound perpendicular to the axis. This localized reinforcement approach provides enhanced mechanical strength at the critical closure lid attachment area without uniformly increasing the thickness and weight of the entire sleeve length.
Solution Approach 2:
The patent uses partial action by applying the third reinforcing layer only to the end portion rather than the entire sleeve. This partial reinforcement provides sufficient mechanical strength for the critical area while minimizing additional material usage and weight increase.
4Strength
If an inner ring structure is added to receive internal pressure, then the mechanical strength is improved, but the device complexity is increased
Solution Approach 1:
The patent merges the reinforcement function into the existing sleeve structure by adding layers directly to the fiber-reinforced resin sleeve. Instead of adding a separate inner ring component, the third layer wound perpendicular to the axis at the end portion integrates the pressure-receiving function into the sleeve itself, simplifying the overall device structure while maintaining enhanced mechanical strength.
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 method achieves durable internal pressure mechanical strength of 400 kg/cm2 or more while maintaining a compact size and reducing weight, preventing peeling between layers and simplifying the manufacturing process.
Implementation Method 1
continuously winding the fiber, impregnated with the resin, on a mandrel substantially in a perpendicular direction to an axial direction of the mandrel to form a first layer F
Implementation Method 2
subsequently continuously winding the fiber on the first layer F at an acute angle to the axial direction of the mandrel to form a second layer S over an entire range of the sleeve 1
Implementation Method 3
subsequently continuously winding the fiber on the second layer S substantially in the perpendicular direction to the axial direction of the mandrel to form a third layer T wound only on the end portion of the sleeve 1
Implementation Method 4
after curing the resin, providing the closure lid 2 and the retainer ring 3 to the sleeve 1 formed by removing the mandrel away
Data Source
AI summary
To provide a fiber reinforced resin sleeve that is superior in mechanical strength in low cost and easily without enlarging the sleeve and increasing the weight of the sleeve, a method for manufacturing an internal pressure container in which both end portions of a fiber reinforced resin sleeve 1 formed by continuously winding a fiber in a filament winding method with both ends having larger diameters are closed by closure lids 2, and the closure lids 2 are supported by retainer rings 3 coupled to the sleeve 1, comprising the following steps of: continuously winding the fiber, impregnated with the resin, on a mandrel substantially in a perpendicular direction to an axial direction of the mandrel to form a first layer F; setting the first layer F so that a distal end is located in a position at a predetermined position L from an end of the sleeve 1 and a proximal end is located in a position inside of the closure lid 2 and the retainer ring 3; subsequently continuously winding the fiber on the first layer F at an acute angle to the axial direction of the mandrel to form a second layer S over an entire range of the sleeve 1; subsequently continuously winding the fiber on the second layer S substantially in the perpendicular direction to the axial direction of the mandrel to form a third layer T wound only on the end portion of the sleeve 1; and after curing the resin, providing the closure lid 2 and the retainer ring 3 to the sleeve 1 formed by removing the mandrel away.