Composite Pressure Vessel Band Layout for Crack Resistance

Solution Overview

Problem

Conventional pressure vessels experience cracks and permanent deformation due to internal pressure loads, primarily caused by neglecting the influence between adjacent bands during the filament winding process.

Innovation Solution

A pressure vessel design that incorporates a composite material with overlapping and rotationally symmetrical band sets, each with specific stack angles and cross areas, ensuring uniform load distribution and minimizing stress concentration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If conventional filament winding process is used without considering influence between adjacent bands, then manufacturing process is simplified, but cracks occur between adjacent bands and permanent deformation occurs due to internal pressure load

Engineering Contradiction:

Improvemanufacturing process simplicityVSAvoidcrack resistance between bands

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent applies preliminary action by pre-calculating and pre-designing the optimal stacking angles and positions of adjacent bands during the manufacturing planning stage. The filament winding process incorporates predetermined angular relationships between adjacent bands to prevent crack formation, ensuring that the structural integrity is built into the manufacturing process itself rather than being added as a corrective measure later.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes critical parameters including the stacking angles of adjacent bands and the angular relationship between consecutive band layers. By optimizing these angular parameters and adjusting the filament winding process to account for interactions between adjacent bands, the structure achieves enhanced crack resistance while maintaining manufacturing feasibility through controlled parameter adjustments.

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If conventional filament winding process is used without considering influence between adjacent bands, then manufacturing process is simplified, but permanent deformation occurs due to band folding under internal pressure load

Engineering Contradiction:

Improvemanufacturing process simplicityVSAvoidstructural stability against permanent deformation

Core Design Contradiction:

Ease of manufactureVSStability of the object's composition

Solution Approach 1:

The patent applies preliminary action by pre-calculating and pre-designing the optimal stacking angles and positions of adjacent bands during the manufacturing planning stage. The filament winding process incorporates predetermined angular relationships between adjacent bands to prevent crack formation, ensuring that the structural integrity is built into the manufacturing process itself rather than being added as a corrective measure later.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes critical parameters including the stacking angles of adjacent bands and the angular relationship between consecutive band layers. By optimizing these angular parameters and adjusting the filament winding process to account for interactions between adjacent bands, the structure achieves enhanced crack resistance while maintaining manufacturing feasibility through controlled parameter adjustments.

Inventive Principle:

Principle #35Parameter changes

3Strength

If composite material bands are stacked to reinforce dome part, then pressure vessel strength is improved, but cracks and permanent deformation occur due to neglected band interactions

Engineering Contradiction:

Improvepressure vessel strengthVSAvoidcrack resistance and deformation prevention

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent applies preliminary action by pre-calculating and pre-designing the optimal stacking angles and positions of adjacent bands during the manufacturing planning stage. The filament winding process incorporates predetermined angular relationships between adjacent bands to prevent crack formation, ensuring that the structural integrity is built into the manufacturing process itself rather than being added as a corrective measure later.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes critical parameters including the stacking angles of adjacent bands and the angular relationship between consecutive band layers. By optimizing these angular parameters and adjusting the filament winding process to account for interactions between adjacent bands, the structure achieves enhanced crack resistance while maintaining manufacturing feasibility through controlled parameter adjustments.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250354654A1Pressure vessel and method for manufacturing the same

Publication Date: 2025.11.20 KIA CORPORATION

AI summary

An embodiment pressure vessel includes a liner and a composite material. The liner includes a cylinder part defining a central area of an outer surface of the liner and a dome part defining a peripheral area of the outer surface of the liner and connected to opposite ends of the cylinder part in a lengthwise direction, wherein when an imaginary straight line passing through a center of the liner and extending in the lengthwise direction is defined as a reference straight line. The composite material includes a plurality of bands surrounding the outer surface of the liner and a first composite material area having a shape surrounding the dome part and in which a plurality of band sets, only portions of which overlap each other, are stacked along the lengthwise direction, wherein the first composite material area is rotationally symmetrical with respect to the reference straight line.