Pressure Vessel Helical Layers for Dome Stress Control
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Solution Overview
Problem
Conventional pressure vessels experience stress concentration and irregular shapes due to excessive stacking of composite material bands on the dome portion, leading to performance deterioration of adjacent layers.
Innovation Solution
The pressure vessel design includes helical layers with varying angles and thicknesses, where the first and second helical layers have different angles and thickness ratios, minimizing excessive stacking on the dome portion compared to the cylinder portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If winding is performed based on the reinforcement point of the designated dome portion, then the dome portion is adequately reinforced, but the composite material thickness becomes excessively thick on the dome portion causing layer crushing and stress concentration
Solution Approach 1:
The patent applies different winding angles to different regions of the pressure vessel. Specifically, the cylinder portion uses a first winding angle while the dome portion uses a second winding angle that is greater than the first. This local differentiation allows adequate reinforcement of the dome portion without causing excessive thickness accumulation and layer crushing.
Solution Approach 2:
The patent changes the winding angle parameter between different regions. By increasing the winding angle from the cylinder portion to the dome portion, the patent optimizes the distribution of composite material thickness, preventing both insufficient reinforcement and excessive stacking that would cause manufacturing defects.
2Strength
If more bands are stacked on the dome portion compared to the cylinder portion, then the dome portion receives sufficient reinforcement, but adjacent layers are crushed and irregular shapes are caused leading to stress concentration
Solution Approach 1:
The patent implements local quality by assigning different winding angles to different portions of the vessel. The cylinder portion uses a smaller winding angle while the dome portion uses a larger winding angle, ensuring that each region receives appropriate reinforcement without compromising layer integrity through excessive stacking.
Solution Approach 2:
The patent introduces dynamic adjustment of the winding angle along the vessel length. The winding angle transitions from a first angle in the cylinder portion to a second angle in the dome portion, allowing the composite material to be distributed dynamically according to the structural requirements of each region, preventing layer crushing while maintaining reinforcement effectiveness.
3Strength
If composite material is stacked with high tension on the dome portion, then reinforcement is improved, but the performance of front and rear layers deteriorates due to accumulated tensions
Solution Approach 1:
The patent changes the winding angle parameter to optimize stress distribution. By using a greater winding angle on the dome portion compared to the cylinder portion, the patent reduces tension accumulation in the composite material layers, preventing performance deterioration while maintaining adequate reinforcement.
Data Source
AI summary
A pressure vessel includes a liner configured so that a pressure is applied to an internal surface of the liner, and a composite material surrounding an external surface of the liner.