Vehicle Bumper Collision Indicator with Sacrificial Break
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Solution Overview
Problem
Current vehicle bumper systems fail to visually indicate a compromise in structural integrity after a collision, which can lead to unsafe conditions when subjected to further loads, as they often revert to their original shape without clear signs of damage.
Innovation Solution
An energy absorption system integrated with a collision indicator featuring a sacrificial portion that breaks at a predetermined stress threshold, allowing for visual inspection and detection of structural integrity compromise, including multiple indicators tuned to different thresholds for directional force analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the bumper assembly is designed to be flexible and return to original shape after impact, then the bumper can absorb collision energy, but it becomes impossible to visually detect structural compromise
Solution Approach 1:
The patent incorporates collision indicators with sacrificial portions into the bumper assembly before impact occurs. These indicators are pre-positioned and configured to break at predetermined stress thresholds, enabling post-impact detection of structural compromise without requiring complex inspection equipment or disassembly procedures.
Solution Approach 2:
The collision indicators utilize visual changes (such as color changes or visible breaks) to indicate structural compromise. The sacrificial portions are designed to fracture or change appearance when subjected to forces exceeding the predetermined threshold, providing immediate visual feedback on bumper integrity without requiring the bumper to remain permanently deformed.
2Ease of manufacture
If the bumper assembly uses a single material for both energy absorption and structural support, then manufacturing is simplified, but it cannot provide both flexibility and structural integrity indication
Solution Approach 1:
The patent segments the bumper assembly into distinct functional components: the main energy-absorbing bumper structure and separate collision indicators with sacrificial portions. This segmentation allows each component to be optimized for its specific function while maintaining overall manufacturing efficiency. The indicators can be integrated during the molding process or attached as separate modules.
Solution Approach 2:
The collision indicators utilize materials with different mechanical properties than the main bumper structure. The sacrificial portions are made from materials designed to break at specific stress thresholds, creating a composite system that provides both energy absorption (main bumper) and integrity indication (indicators) functions.
3Device complexity
If the collision indicator is integrated as a single unit, then the system is simpler, but it cannot detect compromises in different directions or at different stress thresholds
Solution Approach 1:
The collision indicator system is segmented into multiple independent indicators, each with sacrificial portions oriented in different directions and tuned to different stress thresholds. This segmentation enables comprehensive monitoring of structural integrity from multiple axes and force magnitudes while maintaining relatively simple individual indicator designs.
Solution Approach 2:
Each collision indicator is designed as a multi-functional element that simultaneously serves as both a structural component of the bumper assembly and a detection device. The indicators can detect impacts from different directions and at different force levels, providing universal monitoring capability across various impact scenarios without requiring separate specialized devices.
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
Enables safe assessment of bumper system integrity post-impact by clearly indicating damage through visible breaks in sacrificial portions, aiding in determining the cause and necessity of component replacement.
Implementation Method 1
The collision indicator may include at least one sacrificial portion having a shape and size tuned to break upon being subjected to a predetermined stress threshold that indicates a compromise in structural integrity of the energy absorber.
Data Source
AI summary
An energy absorption system for a vehicle is provided with a collision indicator to indicate whether the structural integrity of an energy absorber has been compromised after an impact. The system may be a vehicle bumper system, such as a rear bumper of a pick-up truck, and can include an inner reinforcement member configured to be secured to a structural component or frame of the vehicle. At least one collision indicator is provided, integrated with the inner reinforcement member. The collision indicator includes a sacrificial portion having a size and shape tuned to break upon being subjected to a predetermined stress threshold. The system may be provided with an outer cover member, or bumper fascia, at least a portion of which may be removable to enable a visual inspection of the collision indicator after an impact. A broken sacrificial portion may indicate the need to replace a failed component.