Fire-Resistant Composite Surface Layers
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Solution Overview
Problem
Conventional fiber-reinforced composite materials, such as carbon fiber reinforced plastics, lack sufficient fire resistance and structural integrity when exposed to high temperatures, leading to rapid degradation and collapse in fire scenarios, particularly under compressive stresses.
Innovation Solution
A fiber-reinforced composite material with a bulk portion and a surface portion that includes laminated expanding layers, which expand and/or delaminate during fire, reducing thermal conductivity and maintaining structural integrity by slowing down heat transfer to the underlying bulk portion, while the surface laminate can be identical to or distinct from the bulk portion and includes thermoplastic films, intumescent modifiers, and barrier layers for enhanced protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fiber-reinforced composite materials are used, then structural strength and lightweight properties are achieved, but fire resistance and structural integrity at high temperatures are insufficient
Solution Approach 1:
The composite material is divided into two distinct portions: a bulk portion providing structural strength and a surface portion providing fire protection. This segmentation allows each portion to be optimized for its specific function without compromising the other, resolving the contradiction between fire resistance and structural integrity.
Solution Approach 2:
The invention combines conventional fiber-reinforced composite materials with intumescent fire-protective layers to create a multi-functional composite structure. This composite approach integrates the structural properties of traditional materials with the fire-resistant properties of intumescent materials, simultaneously achieving both structural strength and fire resistance.
2Reliability
If the surface laminate thickness is increased to improve fire protection, then fire resistance is enhanced, but weight and structural complexity increase
Solution Approach 1:
The intumescent layers undergo a parameter change in thickness when exposed to fire, expanding from a thin state during manufacturing to a thick protective state during fire exposure. This allows the material to provide adequate fire protection only when needed, minimizing weight during normal operation while ensuring fire resistance when required.
Solution Approach 2:
The fire-protective surface portion dynamically changes its properties in response to fire exposure. The intumescent layers expand upon heating, transforming from a compact low-weight state to an expanded high-protection state, thus providing adaptability that resolves the contradiction between weight and fire protection.
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 material exhibits improved fire resistance, with a significant decrease in heat release rate and delayed ignition, maintaining mechanical properties and structural integrity for an extended period, even if ignition occurs earlier, as the heat release is lower and flame spread is slower, without adding weight to the structure.
Implementation Method 1
a plurality of laminated first layers, which expand and/or delaminate during fire impact, preferably above 100% and more preferably above 1000%
Implementation Method 2
a remarkable decrease in the thermal conductivity can be achieved, so that the progress of heat to the underlying bulk portion is slowing down
Implementation Method 3
at least one of the expanding layers comprises a thermoplastic film
Data Source
AI summary
A fiber-reinforced composite material includes a bulk portion with a bulk matrix having reinforcing fibers embedded therein, and a surface portion with a plurality of laminated first layers serving as “expanding layers”, which expand and/or delaminate during fire impact. The surface portion also includes a plurality of laminated second layers different from the first layers and serving as “barrier layers”. The expanding layers and barrier layers can be arranged in an alternating sequence.