B-Pillar Torsion Segments for Side Impact Energy Dissipation
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Solution Overview
Problem
Current motor vehicle bodies with B-pillars face challenges in effectively dissipating energy from side impacts, particularly as they tend to be very rigid and rely on fiber breaks or plastic expansion, which may not efficiently manage multi-axial shear stresses.
Innovation Solution
Incorporating a dissipation device with torsion segments that cause plastic torsion in the B-pillar during a side impact, utilizing a lever and structural elements with rotatable connections and strategically placed torsion segments to absorb and dissipate energy through rotation and deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the B-pillar is made rigid using fiber composite material, then the strength and stability of the vehicle body is improved, but the ability to dissipate impact energy through controlled deformation is reduced
Solution Approach 1:
The B-pillar is divided into multiple segments with different structural characteristics. The upper portion maintains high rigidity for strength, while the lower portion incorporates energy-absorbing structures that can deform controllably during side impacts, enabling both strength and energy dissipation
Solution Approach 2:
Different regions of the B-pillar are designed with different material properties and structural characteristics. The upper B-pillar uses rigid fiber composite for strength, while the lower B-pillar incorporates energy-absorbing structures with controlled deformation characteristics, allowing each region to perform its specific function optimally
2Stability of the object's composition
If the B-pillar relies on fiber breaks for energy dissipation, then the structural integrity is maintained, but the efficiency of managing multi-axial shear stresses is insufficient
Solution Approach 1:
The invention converts the potentially harmful multi-axial shear stresses that occur during side impacts into beneficial energy dissipation through controlled plastic deformation of the lower B-pillar. The shear stresses are redirected through energy-absorbing structures that deform in a controlled manner, transforming the harmful stress state into useful energy absorption while maintaining overall structural integrity
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 approach enhances energy dissipation characteristics by allowing precise control over torsional moments, improving material stress distribution and deformation paths, thereby effectively managing side impact energy absorption.
Implementation Method 1
dissipating energy introduced into the vehicle, in particular the B-pillar, from a side impact, by means of torsion in the plastic range caused by the rotation of a lower or vehicle floor-side end of the B-pillar
Implementation Method 2
dissipate at least a portion of the impact energy can be absorbed by a buckling in the plastic range or expansion of the energy absorption device
Data Source
AI summary
A motor vehicle body is disclosed which includes a structural element, a B-pillar fastened thereto, and a device for dissipating energy during a side impact event. The dissipation device include at least one torsion segment capable of plastic torsion caused by the rotation of the lower end of the B-pillar.