Additive Manufacturing Fiber Reinforcement via Laser Randomization
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Solution Overview
Problem
Additive manufacturing methods, such as Selective Laser Sintering, face limitations in producing parts with isotropic mechanical properties due to constraints on fiber length and orientation, leading to inferior mechanical properties compared to traditional methods like injection molding or extrusion, especially for aircraft parts requiring high impact resistance and stiffness across varying temperatures.
Innovation Solution
A method involving powder particles with a predetermined particle size distribution and initial fiber orientation, where directed energy is applied to randomize fiber orientation, resulting in manufactured parts with isotropic mechanical properties, using polymers like polyamide or polyetherketoneketone with fibers like carbon or glass, and processing techniques like cryo-grinding and selective laser sintering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If reinforcing fibers are included in AM parts, then mechanical properties are improved, but fiber orientation constraints limit the full benefit of reinforcement
Solution Approach 1:
The patent segments the fiber reinforcement problem by using multiple discrete powder particles, each containing fibers with specific orientations. By combining many such particles with different fiber orientations in the powder bed, the method achieves overall isotropic reinforcement while maintaining processability of individual particles
Solution Approach 2:
The patent creates a composite material system consisting of polymer matrix particles embedded with reinforcing fibers. This composite structure combines the processability of powder particles with the mechanical enhancement of fiber reinforcement, resolving the contradiction between ease of manufacture and strength improvement
2Strength
If directed energy is used to randomize fiber orientation, then isotropic mechanical properties are achieved, but processing complexity increases
Solution Approach 1:
The patent employs self-service by allowing the directed energy processing itself to randomize the fiber orientations within particles as they are selectively melted and resolidified. The thermal field and material flow during SLS naturally redistribute fibers, achieving isotropic properties without requiring additional external mechanisms for orientation control
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 the mechanical properties of additive manufactured parts, achieving isotropic reinforcement similar to longer fibers while maintaining processability, suitable for high-temperature applications without the weight penalty of metals, and improving design options for complex geometries.
Implementation Method 1
introducing directed energy to the plurality of powder particles
Implementation Method 2
introducing directed energy is performed using a selective laser sintering (SLS) process
Implementation Method 3
forming the powder particles comprises cryo-grinding with the reinforcing fibers
Data Source
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AI summary
Materials and methods is present for manufacturing fiber reinforced parts. A powder material comprising a matrix material of a size particular distribution comprising substantially oriented fiber of a predetermined length distribution and diameter (L/D). A manufactured part that has substantially randomly oriented fiber is provided using an energy delivery system and the powder material.