B-Pillar Assembly Carbon Fiber Cell Member Side Impact
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Solution Overview
Problem
Carbon fiber components in B-pillar assemblies of vehicles lack ductility, which hinders desired deformation performance during side impact and roof crush tests, affecting the structural reinforcement and safety of the vehicle.
Innovation Solution
A vehicle B-pillar assembly design incorporating a T-bracket, B-pillar inner, B-pillar reinforcement, and B-pillar outer, with a carbon fiber cell member disposed within a cavity, oriented to absorb side impact loads and featuring a bowed portion at the zero stress zone, providing additional stiffness and deformation characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If carbon fiber components are used in B-pillar assemblies, then vehicle weight is reduced and fuel economy is improved, but ductility is lost and deformation performance deteriorates
Solution Approach 1:
The B-pillar assembly uses a composite structure combining carbon fiber components with aluminum components. The carbon fiber provides weight reduction while the aluminum components provide ductility and deformation performance. This composite approach allows the assembly to achieve both weight reduction and maintained deformation characteristics during side impact and roof crush tests.
Solution Approach 2:
Different materials are assigned to different components within the B-pillar assembly based on their specific functional requirements. Carbon fiber is used where weight reduction is critical, while aluminum is used where ductility and energy absorption are needed. This localized material selection optimizes the overall performance by giving each component the properties it needs for its specific role.
2Use of energy by moving object
If carbon fiber components are used in B-pillar assemblies, then fuel economy is improved, but desired deformation performance during side impact test is prevented
Solution Approach 1:
The hybrid carbon fiber-aluminum B-pillar assembly achieves fuel economy through weight reduction while maintaining reliability in deformation performance. The aluminum components specifically contribute to energy absorption during side impact tests, ensuring that safety performance is not compromised despite the use of lightweight carbon fiber materials.
3Weight of moving object
If carbon fiber components are used in B-pillar assemblies, then weight is reduced, but ductility is lost
Solution Approach 1:
The B-pillar assembly applies different materials to different components based on their specific functional needs. Aluminum components are strategically placed where ductility and adaptability are required for deformation during impact, while carbon fiber is used in areas where weight reduction is the primary concern. This localized material assignment preserves overall ductility while achieving weight reduction.
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 carbon fiber cell member enhances the B-pillar assembly's ability to absorb side impact loads, offering improved deformation and structural integrity while maintaining weight reduction benefits, as evidenced by comparable performance to all-steel assemblies in crash tests.
Implementation Method 1
the carbon fiber cell member deforms to absorb a portion of a load applied in a side impact to the B-pillar assembly
Data Source
AI summary
A vehicle B-pillar assembly is provided. The vehicle B-pillar assembly includes a T-bracket, a B-pillar inner, a B-pillar reinforcement, a cell member, and a B-pillar outer. The T-bracket is mounted to a roof rail. The B-pillar inner is mounted to the T-bracket. The B-pillar reinforcement is mounted to the B-pillar inner and defines a cavity. The cell member is sized for insertion within the cavity and for securing therein. The cell member is oriented with the T-bracket for partially absorbing a load from a side impact to the B-pillar assembly. The B-pillar outer spans between the roof rail and a rocker panel. The cell member may extend within the cavity between a location above a vehicle beltline and a location below the vehicle beltline.