Vehicle Skeleton Member Weld Layout for Fracture-Resistant Reinforcement
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Solution Overview
Problem
Vehicle skeleton members, such as those with hat-shaped members and reinforcement members, face challenges in efficient reinforcement due to fracture initiation points at welds, particularly when high-strength reinforcement members are used, leading to strain concentration and potential fractures during impact.
Innovation Solution
A vehicle skeleton member design featuring a hat-shaped member, a closing plate, and a reinforcement member with welds positioned closer to the closing plate than the middle surface, incorporating edge segments or notches between welds to mitigate tension forces and prevent fracture, allowing for efficient energy absorption and deformation resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a high-strength reinforcement member is used to provide efficient reinforcement, then the reinforcement effect is improved, but the joints between the reinforcement member and hat-shaped member become initiation points of fracture
Solution Approach 1:
The patent applies local quality by creating a heat-affected zone with modified material properties at the joint region. The welding process locally alters the microstructure and mechanical properties of the reinforcement member at the joint, creating a transition zone that reduces stress concentration and prevents fracture initiation while maintaining high strength in the non-joint regions.
Solution Approach 2:
The patent utilizes parameter changes by controlling welding parameters (heat input, welding sequence, joint geometry) to create a heat-affected zone with optimized mechanical properties. The welding process changes the material parameters (temperature, microstructure, hardness) in the joint region to reduce brittleness and prevent fracture while preserving the high-strength characteristics of the reinforcement member.
2Strength
If the reinforcement member is formed from high-strength material, then the reinforcement efficiency is improved, but strain concentration occurs at the welds leading to potential fractures
Solution Approach 1:
The patent applies local quality by creating a heat-affected zone with modified material properties at the joint region. The welding process locally alters the microstructure and mechanical properties of the reinforcement member at the joint, creating a transition zone that reduces stress concentration and prevents fracture initiation while maintaining high strength in the non-joint regions.
Solution Approach 2:
The patent applies beforehand cushioning by creating a heat-affected zone that acts as a buffer or cushion against strain concentration. The modified material properties in the heat-affected zone预先 (in advance) prepare the joint region to absorb and distribute strains, preventing stress concentration from leading to fracture during subsequent loading.
3Stability of the object's composition
If welds are positioned to join the first walls and second walls, then the structural integrity is improved, but the welds become initiation points of fracture due to tension forces
Solution Approach 1:
The patent applies local quality by creating a heat-affected zone with modified material properties at the joint region. The welding process locally alters the microstructure and mechanical properties of the reinforcement member at the joint, creating a transition zone that reduces stress concentration and prevents fracture initiation while maintaining high strength in the non-joint regions.
Solution Approach 2:
The patent converts the harmful effect of welds (which create stress concentration and potential fracture points) into a beneficial feature by creating a heat-affected zone with optimized material properties. The welding process, which initially creates vulnerability, is transformed into a method for creating a transition zone that actually improves fracture resistance by distributing stresses more evenly.
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 design effectively reduces strain concentration at welds, preventing fractures and enhancing the reinforcement effect while efficiently absorbing energy during bending-crushing deformation with less material usage.
Implementation Method 1
The plurality of welds join the first walls and the second walls
Data Source
AI summary
A vehicle skeleton member 10 includes: a hat-shaped member 1; a closing plate 2; a reinforcement member 6; and a plurality of welds 31. The hat-shaped member 1 includes a first top plate 1a, two first walls 1b, and two flanges 1c. The reinforcement member 6 includes a second top plate 6a and two second walls 6b. The welds 31 join the first and second walls 1b and 6b. The welds 31 joining the first and second walls 1b and 6b are located at positions on the first walls 1b closer to the closing plate 2 than the middle surface C1 between the first top plate 1a and closing plate 2 is. Edge segments 4 of the reinforcement member 6 are located between the welds 31.