Vehicle Center Pillar Stiffener Bead Design for Crack Prevention
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Solution Overview
Problem
Existing vehicle center pillars are prone to cracking during side collisions due to uneven elongation of the first and second ridges formed by the pillar stiffener, which compromises their bending strength and structural integrity.
Innovation Solution
A center pillar stiffener with a bead that is orthogonal to the first and second ridges, featuring linear grooves and curved connections, is integrated into the vehicle body to equalize elongation and enhance bending strength, preventing crack formation during side impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a groove is provided in the pillar stiffener to absorb impact during side collision, then the pillar stiffener can absorb impact energy, but the first ridge and the second ridge have different lengths causing uneven elongation that may lead to cracking
Solution Approach 1:
The patent introduces a bead structure at the specific location where the first ridge and second ridge meet, creating a localized reinforcement zone. This bead has a different geometric property (cross-sectional shape) than the rest of the pillar stiffener, providing localized control over stress distribution and elongation uniformity during side collision impact absorption
Solution Approach 2:
The bead structure is pre-formed in the pillar stiffener before collision occurs. This preliminary geometric feature ensures that during side collision, the elongation of the first and second ridges is equalized from the outset, preventing the development of stress concentrations that would lead to cracking while still allowing impact energy absorption
2Strength
If the pillar stiffener is designed to reinforce bending strength, then the center pillar gains structural strength, but the structure becomes more complex with additional components
Solution Approach 1:
The bead structure is integrated directly into the pillar stiffener as an inherent geometric feature rather than being a separate component. The pillar stiffener combines multiple functions: it provides bending reinforcement, absorbs impact energy through the groove, and controls elongation uniformity through the bead - all in a single integrated structure
Solution Approach 2:
The pillar stiffener is designed to perform multiple functions simultaneously: reinforcing bending strength of the center pillar, absorbing impact energy during side collision, and equalizing elongation of the first and second ridges. This multi-functional design eliminates the need for separate components for each function
Data Source
AI summary
The disclosure provides a vehicle body capable of suppressing the occurrence of cracks in a center pillar at the time of a side collision. A center pillar stiffener forms a hollow structure with a closed cross section by including a side wall which faces the outer surface of a pillar inner, a front wall which is formed by bending from a front end of the side wall to form a first ridge with the side wall and which is joined to the outer surface of the pillar inner, and a rear wall which is formed by bending from a rear end of the side wall to form a second ridge with the side wall and which is joined to the outer surface of the pillar inner. The pillar stiffener is provided with a bead recessed toward the pillar inner and orthogonal to the first and second ridges.