Bumper Beam Closed Cross-Section for Collision Energy Absorption
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Solution Overview
Problem
Conventional bumper beams face challenges in achieving high mass efficiency and absorbed energy performance due to inadequate suppression of side surface fall-down and early buckling, which can lead to interference with the radiator support core and decreased repairability.
Innovation Solution
A closed cross-sectional structure member with a hollow design, featuring a collision side wall, opposed collision side wall, and inner wall parts, which suppresses side wall fall-down and applies bending rigidity to enhance energy absorption and proof stress, thereby preventing cross-section collapse during collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If conventional bumper beam structures are used, then weight reduction is achieved, but side surface fall-down and early buckling occur reducing collision performance
Solution Approach 1:
The bumper beam is divided into multiple closed cross-sectional regions separated by partition walls. This segmentation creates multiple load-bearing paths that distribute collision forces more effectively, preventing early buckling while maintaining lightweight construction. The partition walls act as independent structural elements that reinforce the overall beam without significantly increasing weight.
Solution Approach 2:
The bumper beam employs a composite cross-sectional structure combining outer shell material with partition wall material. This composite approach allows optimization of each component's material properties - the outer shell provides overall structural integrity while internal partitions enhance local buckling resistance, achieving high collision performance with reduced weight compared to solid homogeneous structures.
2Stability of the object's composition
If recess shape is applied to suppress side surface fall-down, then internal hat-shaped member stability improves, but external hat-shaped member buckling is not suppressed
Solution Approach 1:
Reinforcement structures are selectively applied to specific regions of the bumper beam cross-section based on local buckling risk assessment. Rather than uniform reinforcement, partition walls are strategically positioned at critical locations where buckling is most likely to occur, providing localized structural support that prevents external member buckling while maintaining overall weight efficiency.
3Strength
If rigidity is increased to prevent cross-section collapse, then collision load resistance improves, but bumper beam interference with radiator support core increases
Solution Approach 1:
The bumper beam is designed with controlled deformation characteristics that allow dynamic response to collision forces. The closed cross-sectional structure with partitions provides sufficient rigidity to prevent catastrophic collapse while maintaining the ability to deform in a controlled manner during impact, reducing interference with the radiator support core and improving post-collision repairability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a bumper beam with high proof stress and absorbed energy performance, effectively increasing the maximum load and energy absorption while minimizing interference with the radiator support core, thus improving collision safety and repairability.
Implementation Method 1
the bumper beam undergoes bending deformation and the crush box undergoes crushing deformation, thereby absorbing impact
Implementation Method 2
applying bending rigidity to a collision side wall part
Implementation Method 3
the closed cross-sectional structure member exhibits high proof stress and high absorbed energy performance
Data Source
AI summary
A closed cross-sectional structure member includes a hollow member, the hollow member having a collision side wall part located on a collision side, an opposed collision side wall part opposing the collision side wall part, a pair of first side wall part and second side wall part connecting with end portions of the collision side wall part and end portions of the opposed collision side wall part, a first inner wall part extending from the first side wall part to an inside of the hollow member, a second inner wall part extending from the second side wall part to the inside of the hollow member, a third inner wall part connecting with the first inner wall part and the collision side wall part, and a fourth inner wall part connecting with the second inner wall part and the collision side wall part.