Z-Oriented Core Layer 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 maintaining low weight, particularly in achieving sufficient compression strength when scaling up the core layer thickness.
Innovation Solution
A method involving a Z-oriented core layer with reinforcement fibers predominantly oriented perpendicular to the sheet plane, achieved through multiply folding of fleece material into continuously folded arrangements, which are then sandwiched between skin layers and subjected to heating and pressing, resulting in improved 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 decreases, but the compression strength becomes insufficient during skin layer application
Solution Approach 1:
The invention changes the fiber orientation parameter from isotropic (random) to anisotropic (predominantly Z-direction) by using folded fleece material. This parameter change allows the core layer to achieve sufficient compression strength at reduced thickness, enabling weight reduction without compromising structural integrity during skin layer application.
Solution Approach 2:
The invention uses a composite structure combining folded fleece material with skin layers. The folded fleece provides Z-oriented reinforcement fibers that create a composite material system with enhanced compression strength, allowing thinner core layers to maintain sufficient mechanical properties during the manufacturing process.
2Ease of manufacture
If traditional isotropic fiber orientation is used in the core layer, then the manufacturing process is simple, but the compression strength is insufficient for thick core layers
Solution Approach 1:
The invention applies preliminary action by pre-folding the fleece material before placing it in the mold. This preliminary folding action creates the desired Z-oriented fiber arrangement in advance, eliminating the need for complex post-forming operations and maintaining ease of manufacture while achieving superior compression strength.
Solution Approach 2:
The invention transitions from two-dimensional random fiber orientation (isotropic) to three-dimensional Z-oriented fiber arrangement (anisotropic) through folding. This dimensional change in fiber orientation provides enhanced compression strength perpendicular to the sheet plane while keeping the manufacturing process relatively simple.
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 method enhances compression strength of composite parts by ensuring that reinforcement fibers are predominantly oriented in the Z-direction, thereby addressing the limitations of isotropic fiber orientation in traditional manufacturing processes.
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, thereby obtaining the composite part
Implementation Method 3
heating and pressing the sandwich arrangement (A,B,A') followed by cooling
Implementation Method 4
heating and pressing the sandwich arrangement (A,B,A') followed by cooling
Data Source
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AI summary
A method of manufacturing a sheet-like composite part, comprises the following process steps: a) providing a substantially planar arrangement (A, B, A') comprising a core layer (B) sandwiched between a pair of skin layers (A, A'), a first face of the core layer being adjacent and substantially parallel to a first one (A) of said skin layers and a second face of the core layer being adjacent and substantially parallel to the other one (A') of said skin layers, the skin layers (A, A') each comprising a skin thermoplastic and optionally reinforcement fibers, the core layer (B) comprising a fleece material made of fleece thermoplastic fibers and reinforcement fibers, b) heating and pressing the sandwich arrangement (A,B,A') followed by cooling, thereby obtaining the composite part. To improve compression strength of the composite part, the core layer (B) is a Z-oriented core layer having reinforcement fibers that are predominantly oriented in an orientation direction (Z) perpendicular to the first and second faces. Methods for providing the Zoriented core layer include multiple folding, longitudinal compression and needling with differential transport velocity.