Vehicle Body Fireproofing Using Heat-Expanding Coatings
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Solution Overview
Problem
Current fireproofing technologies for metal vehicle bodies are inadequate, leading to potential catastrophic fires and compromised safety due to insufficient strength under heat-load conditions, which can result in vehicle deformation, collapse, and hinder evacuation and rescue operations.
Innovation Solution
A method that involves identifying potential burning damage areas on metal vehicle bodies, applying non-metal fireproof materials with heat expansion properties, and ensuring the space between underbody suspension parts and the rail surface allows safe travel speeds by calculating deformation under high temperatures and iteratively modifying the fireproofing treatment until the required performance is met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fireproofing measures are applied to metal vehicle bodies, then non-metal material fire risks are addressed, but the metal body strength under high temperature remains insufficient leading to deformation and collapse
Solution Approach 1:
The patent applies composite materials by combining metal vehicle body materials with fireproof coating materials to create a composite structure that provides both fire resistance and maintains structural strength under high temperature conditions. The fireproof coating forms a protective layer that insulates the metal body from direct heat exposure.
Solution Approach 2:
The patent changes the physical and chemical parameters of the metal surface through fireproof coating treatment, modifying its thermal conductivity, specific heat capacity, and surface chemistry to resist high temperature effects. This allows the metal body to maintain its mechanical properties longer under fire conditions.
2Reliability
If fireproofing treatment is applied to prevent catastrophic fire, then safety is improved, but the vehicle body deformation under heat load still occurs compromising evacuation time
Solution Approach 1:
The patent implements preliminary action by pre-applying fireproof coating materials to the vehicle body before service. This preventive measure ensures that when fire occurs, the body is already protected, delaying deformation and maintaining structural integrity longer to allow safe evacuation.
Solution Approach 2:
The fireproof coating acts as a beforehand cushioning layer that absorbs and dissipates thermal energy before it can reach the metal body structure. This protective barrier cushions the body against thermal shock and gradual heating, preventing rapid deformation.
3Device complexity
If only oxygen index and flame retardation measurements are used to assess fireproofing, then testing is simplified, but comprehensive fireproofing performance including metal body protection cannot be evaluated
Solution Approach 1:
The patent establishes a multi-functional evaluation system that combines traditional flame retardation tests with high temperature strength testing and deformation measurement. This universal evaluation method assesses both non-metal material fire resistance and metal body thermal performance through an integrated set of standardized tests.
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 the heat-load strength performance of metal vehicle bodies, reducing fire risks and ensuring safe evacuation and rescue time, thereby minimizing property loss and ensuring personnel safety.
Implementation Method 1
applying non-metal fireproof materials with heat expansion properties
Data Source
Figure 1~2
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Figure 3-b
AI summary
A method for improving the fireproofing performance of a vehicle body includes the following steps: determining potential burning damage area of the vehicle body (102); calculating a deformation amount of the vehicle body given that a predetermined high temperature load is exerted on the potential burning damage area (103); on the basis of the deformation amount of the vehicle body, judging whether a space between a underbody suspension parts and rail surface satisfies the traveling capability requirements at a safe speed after the deformation of the vehicle body (104); if not, performing fireproofing treatment on the burning damage area of the vehicle body. By use of the method, the heat-load strength performance of the vehicle body is improved, thus reducing the fire risk and satisfying the traveling capability requirements. The evacuation and rescue time for passengers can also be obtained once a fire happens.