Composite High-Pressure Tank Winding to Prevent Junction Voids
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Solution Overview
Problem
Existing high-pressure tanks face issues with void formation at the junction portion of the cylinder and dome due to the end portion of the hoop layer when using the filament winding method, leading to stress distribution errors and potential burst points.
Innovation Solution
A high-pressure tank design with a hoop layer and helical layer where the helical layer is wound at a specific angle defined by Equation 1 (θ = tan^-1(πD/2A) and includes a twist portion to press the end of the hoop layer, preventing void formation at the junction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the hoop layer is wound on the cylinder portion using the filament winding method, then the tank can withstand circumferential stress from internal pressure, but a void forms at the junction portion between the cylinder and dome due to the end portion of the hoop layer
Solution Approach 1:
The patent applies preliminary action by extending the hoop layer beyond the cylinder portion onto the dome portion before winding the helical layer. This extension is done in advance to prevent void formation at the junction portion, ensuring that the helical layer can properly cover and bond the area where the hoop layer ends, thus eliminating the manufacturing defect before subsequent processing occurs.
2Device complexity
If the tank design uses a hoop layer and helical layer without additional components or increased thickness, then the structure remains simple, but voids form at the junction portion compromising stress distribution
Solution Approach 1:
The patent applies dimensionality change by extending the hoop layer into the longitudinal dimension beyond the cylinder-dome junction, rather than adding complexity through additional layers or components. This spatial extension allows the hoop layer to provide continuous reinforcement at the junction portion, ensuring proper stress distribution while maintaining structural simplicity and avoiding void formation.
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
Provided is a high-pressure tank wound with a hoop layer and a helical layer. According to the present invention, the high-pressure tank includes: a liner which includes a cylinder portion and two dome portions respectively formed at both ends of the cylinder portion; and a composite material layer which includes a hoop layer and a helical layer, wound on an outer circumferential surface of the liner, wherein the helical layer includes a twist portion wound on a junction portion of the cylinder portion and the dome portion, and the twist portion is twisted and wound while wrapping on an end portion of the hoop layer when the helical layer passes by the hoop layer and is then wound toward the dome portion.