Multi-Branch Vehicle Door Reinforcement Element
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Solution Overview
Problem
Automotive door reinforcement elements face challenges in balancing energy absorption and deflection during side impacts while maintaining a small cross-section to avoid interference with other door components, while also aiming to reduce vehicle weight for improved fuel efficiency.
Innovation Solution
A reinforcement element with a cross-section comprising four adjacent branches extending in different directions, forming non-zero angles of opposite signs, and arcuate junctions with specific radii of curvature, made from high-strength press hardening steel like Usibor®, which absorbs energy by unfolding before bending, thus enhancing impact resistance without a large cross-sectional area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cross-section of the reinforcement element is increased to improve energy absorption and impact resistance, then the safety performance is improved, but the reinforcement element will interfere with other door components such as door glass and operating mechanisms
Solution Approach 1:
The reinforcement element transitions from a conventional planar cross-section to a three-dimensional multi-branch structure. The four adjacent branches extending in different directions create a spatial configuration that absorbs energy through unfolding movements in multiple dimensions, achieving high impact resistance without increasing the projected cross-sectional area that would interfere with door components.
Solution Approach 2:
The reinforcement element is divided into four adjacent branches instead of using a solid monolithic structure. This segmentation allows each branch to independently deform and absorb energy during impact, while the overall structure maintains a compact footprint. The branches can unfold sequentially, distributing the energy absorption process across multiple stages and reducing the required cross-sectional area.
2Strength
If the cross-section of the reinforcement element is increased to improve energy absorption, then the impact resistance is improved, but the weight of the vehicle increases
Solution Approach 1:
The three-dimensional multi-branch configuration enables the reinforcement element to absorb energy through spatial unfolding rather than relying on increased material volume. The branches deploy in different directions during impact, creating a kinetic energy absorption mechanism that is more efficient per unit mass, thereby reducing the overall weight required to achieve the same energy absorption capability.
Solution Approach 2:
The reinforcement element is designed to be dynamic rather than static, with branches that can unfold and reconfigure during impact events. This dynamic behavior allows the structure to absorb energy through movement and deformation, maximizing energy absorption efficiency without requiring excessive material mass. The structure transitions from a rigid form to a deployable configuration during collisions.
3Strength
If the reinforcement element is designed to absorb significant energy through large deflection, then the impact resistance is improved, but the structural complexity increases
Solution Approach 1:
The structure is segmented into four standardized adjacent branches with consistent geometric features and arcuate junctions. This modular segmentation simplifies the design process and manufacturing, as each branch can be formed using similar processes. The repetition of standardized elements reduces overall structural complexity compared to a fully custom multi-branch configuration.
Solution Approach 2:
The arcuate junctions connecting the branches feature standardized curved geometries with controlled radii of curvature. These curved transitions simplify stress distribution and manufacturing compared to sharp corners, while maintaining structural integrity. The consistent use of arcuate features across all junctions reduces design complexity and facilitates uniform fabrication processes.
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 reinforcement element effectively absorbs significant energy and provides improved resistance to side impacts, protecting occupants by preventing intrusion into the passenger compartment, while maintaining a reduced thickness and weight to optimize vehicle safety and efficiency.
Implementation Method 1
Owing to the geometry of the main section, the reinforcement element may absorb an important amount of energy before bending and thus provides an improved resistance to impacts
Implementation Method 2
the first branch and the second branch being joined together by a first arcuate junction, the second branch and the third branch being joined together by a second arcuate junction, the radiuses of curvature of said first arcuate junction and said second arcuate junction being substantially comprised between 5 mm and d/2
Data Source
AI summary
The reinforcement element for reinforcing the structure of a door of a vehicle extends along a main direction and comprises at least a main portion having a reinforcing cross-section (40) extending in a plane substantially perpendicular to the main direction. The reinforcing cross-section (40) includes at least four adjacent branches (42a, 42b, 42c, 42d, 42e, 42f, 42g), each extending in different directions, two successive branches forming a non-zero angle, at least two of the non-zero angles being of opposite signs.