High-Slenderness Structural Part for Predictable Crash Buckling
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Solution Overview
Problem
High slenderness structural parts in vehicles face energy absorption inefficiencies when subjected to angled compressive loads, leading to potential bending instead of optimal buckling, which reduces energy absorption and safety effectiveness.
Innovation Solution
Development of high strength materials with an ultimate tensile strength above 1000 MPa, a Yield Strength to Ultimate Tensile Strength ratio greater than 0.90, and a bending angle normalized to 1.5 mm thickness of at least 55°, combined with hot stamping and specific chemical compositions to enhance buckling behavior and minimize heat-affected zone softening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If high slenderness parts are used for energy absorption, then weight is reduced, but under angled compressive loads they bend instead of buckling, reducing energy absorption efficiency
Solution Approach 1:
The patent changes the material parameters by specifying ultra-high strength steel with UTS > 1000 MPa and YS/UTS ratio > 0.90, which fundamentally alters the buckling behavior under angled loads. This parameter change enables the part to maintain slenderness while achieving robust bottling behavior that maximizes energy absorption.
2Loss of energy
If material strength is increased to improve buckling behavior, then energy absorption improves, but manufacturing complexity increases due to hot stamping requirements
Solution Approach 1:
The patent specifies precise material parameters (UTS > 1000 MPa, YS/UTS > 0.90, specific chemical compositions) that enable the use of hot stamping technology. These parameter changes transform the manufacturing approach while achieving the desired mechanical properties for optimal energy absorption.
Solution Approach 2:
The patent employs ultra-high strength steel with specific chemical compositions (C: 0.18-0.38%, Si: 0.70-1.60%, Mn: 1.20-2.50%, etc.) that combine multiple alloying elements to achieve the required mechanical properties. This composite material approach enables hot stamping while achieving the necessary strength and buckling behavior.
3Reliability
If YS/UTS ratio is increased to improve buckling robustness, then angular load resistance improves, but material ductility may be reduced
Solution Approach 1:
The patent precisely controls the YS/UTS ratio to be greater than 0.90 through specific chemical compositions and hot stamping parameters. This parameter optimization achieves robust buckling behavior under angled loads while maintaining sufficient ductility for formability and energy absorption through controlled deformation.
Solution Approach 2:
The patent uses a composite material system with specific alloying elements (C, Si, Mn, Mo, B, Ti, Al, Cr, Ni, Cu) in controlled proportions to achieve the target YS/UTS ratio > 0.90 while maintaining adequate ductility. The synergistic effect of these elements enables both high strength and formability.
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 solution promotes robust buckling behavior under angled loads, significantly increasing energy absorption and maintaining structural predictability during crashes, thereby enhancing vehicle safety and compliance with stringent safety and weight requirements.
Implementation Method 1
the material used to manufacture said at least one portion or all of所述high slenderness part is steel which has been subjected to a thermomechanical treatment and/or a heat treatment
Implementation Method 2
During an impact they act to absorb energy by buckling and thus forming folds which absorb part of the crash energy
Data Source
AI summary
A high strength, high slenderness structural part having excellent energy absorption properties in the case of an impact is provided. In particular, a structural part for use in an automotive vehicle is provided. The structural part has an ultimate tensile strength higher than 1000 MPa, a yield strength to ultimate tensile strength ratio higher than 0.85, a bending angle normalized to 1.5 mm thickness higher than 55° and a slenderness ratio higher than 10.