Vehicle Body Hat Channel Beads for Thin-Gauge Buckling Resistance
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Solution Overview
Problem
Existing automobile body components using high-tensile steel sheets with thin thicknesses fail to exhibit sufficient three-point bending characteristics in local buckling mode due to reduced stiffness and deformation resistance, compromising collision safety performance.
Innovation Solution
A structural member for an automobile body featuring a hat channel member with a top sheet portion, side wall portions, and flange portions, along with a joining member, incorporating beads and beads to enhance deformation resistance against compressive and tensile stresses, thereby improving load capacity and collision safety performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a high-tensile steel sheet with thin sheet thickness is used, then weight reduction is achieved, but stiffness and deformation resistance decrease
Solution Approach 1:
The invention introduces beads (curved protrusions) on the surface of the hat channel member to replace flat surfaces. These beads create localized curvature that significantly increases bending stiffness and deformation resistance without adding substantial weight, thereby resolving the contradiction between weight reduction and stiffness maintenance
Solution Approach 2:
The beads are strategically positioned at specific locations where stress concentration occurs during collision. This local reinforcement approach enhances deformation resistance precisely where needed while maintaining overall weight reduction, rather than uniformly thickening the entire component
2Weight of moving object
If a high-tensile steel sheet with thin sheet thickness is used, then weight reduction is achieved, but collision safety performance decreases
Solution Approach 1:
The beads create curved surfaces that enhance energy absorption characteristics during collision. The curved geometry allows for more progressive deformation and energy dissipation, improving collision safety performance while maintaining thin sheet thickness and weight reduction
Solution Approach 2:
The beads are pre-formed on the hat channel member before assembly, creating predetermined stress distribution patterns that optimize collision response. This preliminary structural preparation ensures enhanced safety performance is built into the component design rather than added through post-processing or thicker materials
3Strength
If conventional bead structures are added to enhance buckling resistance, then deformation resistance improves, but device complexity increases
Solution Approach 1:
The beads are integrated directly into the hat channel member as a unified structure rather than being separate components. This merging of the bead reinforcement with the main structural member simplifies manufacturing and assembly while maintaining enhanced deformation resistance, thereby reducing overall device complexity
Data Source
AI summary
Disclosed is a structural member for an automobile body includes: a hat channel member that has a top sheet portion, a pair of side wall portions extending via first corner portions, and a pair of flange portions extending via second corner portions; and a joining member that has a pair of joining portions and a top sheet facing portion, wherein a first bead extending in the longitudinal direction is formed on the top sheet facing portion, and wherein two or more second beads extending in a direction intersecting the longitudinal direction are formed on the pair of side wall portions.