Z-Oriented Core Layer for Composite Compression Strength
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Solution Overview
Problem
Existing methods for manufacturing composite parts with fiber-reinforced thermoplastics face challenges in optimizing mechanical properties while minimizing weight, particularly in achieving sufficient compression strength when using a thick core layer during the heat pressing process.
Innovation Solution
A method involving a Z-oriented core layer with reinforcement fibers predominantly oriented perpendicular to the skin layers, achieved by cutting and arranging pre-consolidated thermoplastic sheets into congruent stripes and forming a core stack, which is then heated and pressed with skin layers to create a sheet-like composite part with enhanced compression strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the core layer thickness is increased to reduce weight, then the weight of the composite part is reduced, but the compression strength of the core layer during heat pressing is insufficient
Solution Approach 1:
The patent changes the fiber orientation parameter from random/isotropic to unidirectional (Z-oriented) to fundamentally alter the mechanical properties of the core layer. This parameter change enables the core layer to achieve high compression strength in the thickness direction while maintaining low weight, as the fibers are aligned to bear loads perpendicular to the skin layers effectively.
Solution Approach 2:
The patent uses a composite structure combining skin layers with a fleece material core layer containing reinforcement fibers. This composite material approach allows the core layer to provide both weight reduction and enhanced compression strength through the synergistic combination of different materials and their specific arrangements.
2Strength
If reinforcement fibers are added to the core layer to improve compression strength, then the compression strength is improved, but the weight of the composite part increases
Solution Approach 1:
The patent applies local quality by concentrating reinforcement fibers specifically in the core layer where compression strength is needed, while keeping the skin layers relatively thin. The fibers are oriented in the Z-direction (perpendicular to skin layers) to provide localized compression support without adding excessive weight throughout the entire structure.
Solution Approach 2:
The patent optimizes the fiber content parameter in the core layer to achieve the minimum necessary reinforcement for sufficient compression strength. By carefully controlling the fiber concentration and orientation, the patent achieves the required mechanical properties while minimizing weight addition.
3Strength
If a thick core layer is used to maintain structural integrity, then the compression strength is improved, but the manufacturing complexity increases due to insufficient compression strength during heat pressing
Solution Approach 1:
The patent applies preliminary action by pre-consolidating the core layer with Z-oriented reinforcement fibers before the final heat pressing step. This preliminary consolidation ensures the core layer has sufficient compression strength during the subsequent heat pressing operation, eliminating the need for complex manufacturing controls or support structures.
Solution Approach 2:
The patent changes the structural parameter of the core layer by implementing Z-oriented fiber arrangement, which fundamentally improves compression strength. This parameter change simplifies the manufacturing process because the core layer inherently maintains its shape and provides sufficient support during heat pressing without requiring additional manufacturing complexities.
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 Z-oriented core layer significantly improves compression strength of the composite part, allowing for better mechanical properties while maintaining a lightweight structure.
Implementation Method 1
heating and pressing the sandwich arrangement (A,B,A′) followed by cooling
Implementation Method 2
heating and pressing the sandwich arrangement (A,B,A′) followed by cooling
Implementation Method 3
heating and pressing the sandwich arrangement (A,B,A′) followed by cooling
Data Source
AI summary
Sheet-like composite parts are manufactured by:a) providing a substantially planar arrangement (A, B, A′) comprising a core layer (B) of a fleece material made of fleece thermoplastic fibers and reinforcement fibers, sandwiched between a pair of skin layers (A, A′), of a skin thermoplastic and optionally reinforcing fibers, the faces of the core layers adjacent and substantially parallel the skin layers,b) heating and pressing the sandwich arrangement (A,B,A′) followed by cooling, thereby obtaining the composite part, wherein the compression strength of the composite part is improved by selecting a core layer (B) which is a core layer having reinforcement fibers predominantly oriented in a direction (Z) perpendicular to the first and second faces.