Oblique Notched-Needle Needling of Composite Preforms
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Solution Overview
Problem
Existing methods for producing composite material parts with continuous unidirectional fibers face challenges such as high manufacturing costs, significant wastage, and insufficient permeability and cohesion during impregnation, leading to potential fiber rupture and reduced mechanical properties.
Innovation Solution
A process involving the production of a preform with continuous unidirectional fibers, application of nonwoven filaments, and needling using a device with notched needles, where the needles are oriented at a non-zero angle to the fiber orientation, reducing fiber rupture and enhancing cohesion and permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If needling is performed to improve cohesion and permeability, then fiber rupture occurs and mechanical properties deteriorate
Solution Approach 1:
The invention changes the critical parameter of needle orientation relative to fiber direction. By setting the needle axis to be oblique (45-60 degrees) rather than perpendicular to the fiber orientation, the mechanical action during needling no longer directly opposes the fiber strength axis, thereby reducing fiber rupture while maintaining the necessary cohesion enhancement.
2Reliability
If conventional needling with perpendicular needles is used, then permeability improves, but fiber rupture increases
Solution Approach 1:
The invention modifies the geometric parameter of needle orientation from perpendicular (90 degrees) to oblique (45-60 degrees) relative to the fiber direction. This parameter change allows the needling process to create effective permeability pathways while the oblique angle prevents direct stress concentration on individual fibers, reducing rupture and fibrillation.
3Productivity
If automated lay up is used to reduce cost and wastage, then production efficiency improves, but permeability and cohesion during impregnation deteriorate
Solution Approach 1:
The invention enables the automated lay-up process to inherently create the desired permeability and cohesion by incorporating the needling operation with oblique needle orientation as an integrated step. The automated system performs the needling action that naturally creates inter-fiber pathways and enhances cohesion without requiring additional manual intervention, thus maintaining high productivity while improving reliability.
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 process effectively reduces fiber rupture, increases the cohesion and permeability of the preform, and enhances the mechanical properties of the final composite part, while also reducing production time and increasing the production rate of needled preforms.
Implementation Method 1
a step of needling the filaments by means of a needling device comprising a plurality of needles, each needle being provided with a notch extending along a notch axis perpendicular to the main longitudinal axis of the needle... so that filaments are driven by the needles and arranged in a direction substantially perpendicular to the continuous fibers of the preform
Data Source
AI summary
A method for producing a composite material part comprising —a step of producing a preform formed of unidirectional continuous fibers oriented in at least one fiber orientation, —a step of applying non-woven filaments to the preform, and —a step of needling the filaments by means of a needling device comprising a plurality of needles, each needle being provided with a notch extending along a notch axis perpendicular to the main longitudinal axis of the needle, or several notches each extending along a notch axis perpendicular to the main longitudinal axis of the needle, the notch axes being parallel to each other, the needles and the preform being arranged so that the notch axes form a non-zero angle with the fiber orientation.