Honeycomb Structure Boundary Wall Thickness for Stress Relief
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Solution Overview
Problem
Honeycomb structures with multiple cell structures face stress concentration issues near boundary walls, leading to mechanical strength deterioration and potential cracking, especially when formed using ceramic materials and subjected to extrusion processes.
Innovation Solution
A honeycomb structure design where the boundary wall thickness is set to be thicker than the circumferential wall, typically 150% or more, to alleviate stress concentration and prevent deformation, thereby enhancing mechanical strength by preventing crack generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a boundary wall is arranged at the boundary part of cell structures with different cell densities, then the honeycomb structure can accommodate multiple cell structures for improved purification efficiency, but stress concentration is generated near the boundary wall leading to breakage and reduced mechanical strength
Solution Approach 1:
The boundary wall is designed with a thickness that is 150% or more of the circumferential wall thickness, creating a localized structural reinforcement at the critical boundary region. This non-uniform thickness distribution concentrates material where stress concentration occurs, effectively preventing breakage while maintaining the overall honeycomb structure's purification efficiency
Solution Approach 2:
The increased boundary wall thickness acts as a preventive measure against stress concentration and potential breakage. By designing the boundary wall to be thicker in advance, the structure is prepared to withstand the expected stress concentrations before they occur during operation or extrusion processes
2Ease of manufacture
If the honeycomb formed body is formed by extrusion from ceramic raw materials, then the honeycomb structure can be manufactured with desired cell structures, but the cell is deformed near the boundary wall leading to crack generation and reduced mechanical strength
Solution Approach 1:
The boundary wall is designed with increased thickness (150% or more of circumferential wall thickness) to provide localized structural support during the extrusion process. This reinforcement prevents cell deformation at the boundary region where stress concentration occurs during manufacturing, ensuring manufacturing precision while maintaining ease of manufacture
Data Source
AI summary
A honeycomb structure has a pillar-shaped honeycomb structure body having porous partition walls which defines cells which forms a passage of liquid extended from an inflow end face toward an outflow end face, a circumferential wall arranged to surround a circumference of the partition walls. The honeycomb structure body has an outermost circumference cell structure including a complete cell arranged at the outermost circumference of the honeycomb structure body, a center cell structure formed by the cells arranged at a center part at an inner side to the outermost circumference cell structure, and a boundary wall arranged at a boundary part between the outermost circumference cell structure and the center cell structure. The outermost circumference cell structure and the center cell structure are formed as different structures to each other, and a thickness of the boundary wall is set to be thicker than a thickness of the circumferential wall.