Bumper Beam Central Flange Recesses for Controlled Deformation
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Solution Overview
Problem
Existing bumper beams experience poor energy absorption in collisions, particularly in offset collisions, due to the deformation of fastening portions, which often deform in an unfavorable manner, leading to inadequate energy absorption.
Innovation Solution
The central flange of the bumper beam features transverse recesses extending along the webs for up to one-third of their length at the fastening portions, enhancing deformation properties by counteracting inward deflection and initiating controlled deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the beam structure is made rigid to maintain structural integrity, then strength is improved, but energy absorption capability deteriorates due to unfavorable deformation at fastening portions
Solution Approach 1:
The patent applies local quality by introducing transverse recesses specifically at the fastening portions where the central flange connects to the vehicle structure. These recesses create localized deformation zones with different mechanical properties compared to the rest of the beam. The recesses have varying depths and cross-sectional areas that are optimized to control deformation behavior locally without compromising the overall structural integrity of the beam.
Solution Approach 2:
The transverse recesses are pre-formed features in the central flange before collision occurs. These recesses prepare predetermined deformation paths and stress distribution patterns that guide how the fastening portions will deform during impact. By pre-configuring the geometry of these recesses, the beam is ready to absorb energy through controlled deformation rather than unpredictable failure modes.
2Reliability
If the fastening portions are made more robust to prevent deformation, then reliability is improved, but energy absorption deteriorates due to restricted deformation capability
Solution Approach 1:
The patent creates a distinction between local deformation zones (the transverse recesses) and the surrounding robust structure. The recesses are designed with specific geometric characteristics that allow controlled deformation, while the rest of the fastening portions maintain their structural integrity. This local differentiation enables the fastening portions to be both reliable and energy-absorbing.
Solution Approach 2:
The patent converts the potentially harmful uncontrolled deformation of fastening portions into a beneficial controlled deformation mechanism. By introducing transverse recesses, the deformation that would otherwise be unfavorable is redirected into predetermined paths that enhance energy absorption. The harmful effect of deformation is transformed into a useful energy dissipation mechanism.
3Loss of energy
If transverse recesses extend deeper along the webs to improve deformation control, then energy absorption is improved, but manufacturing complexity increases
Solution Approach 1:
The patent optimizes the geometric parameters of the transverse recesses, specifically limiting their extension along the webs to a maximum of one-third of the web extent. This parameter optimization balances the competing requirements of energy absorption and manufacturing simplicity. The recesses have varying depths and cross-sectional areas that are carefully controlled to achieve the desired deformation behavior without excessive complexity.
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
This design improves energy absorption by delaying the onset of deformation and ensuring controlled deformation, effectively addressing both frontal and offset collisions, while maintaining structural integrity under high forces.
Implementation Method 1
The central flange has, at the beam's fastening portions, transverse recesses which continue along the webs for a maximum of one-third of the extent of the webs in the transverse direction
Implementation Method 2
the beam cannot give way elastically in the same way as it can between the fastening portions
Data Source
AI summary
A bumper beam has an open hat beam profile with a central flange (11), two webs (12, 13) and two side flanges (14, 15), and it has two fastening portions (16, 17) in which the central flange has transverse recesses (30, 31), which continue along the webs for a maximum of 40% of the extent of the webs in the transverse direction. These recesses strengthen the profile and provide controlled deformation in response to collision loading.