Segmented Prepreg Base Material for Fiber Flow Control
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Solution Overview
Problem
Existing fiber-reinforced plastic molding methods, such as SMC, struggle with irregular fiber distribution and orientation, leading to poor mechanical properties and defects like warp and surface sinks, especially in thin moldings, while prepreg base materials with incisions improve mechanical characteristics but lack sufficient strength for structural applications.
Innovation Solution
A prepreg base material with specific incision patterns, including slit segments aligned in certain directions and angles, and a laminated structure with alternating fiber orientations, allows for high flowability and flexible shaping while maintaining mechanical strength by controlling slit segment length and orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If continuous fibers are used in prepreg base material, then mechanical strength is improved, but flowability and flexible shaping ability deteriorate
Solution Approach 1:
The continuous reinforcing fibers are divided into segments by making incisions at regular intervals through the thickness of the prepreg base material. This segmentation allows the fiber bundles to flow and adapt to complex mold shapes while maintaining sufficient mechanical strength through the controlled segment length and orientation.
2Adaptability or versatility
If incisions are made in prepreg base material to improve flowability, then flexible shaping ability is improved, but mechanical strength deteriorates
Solution Approach 1:
The incisions are made with specific local characteristics including controlled length, orientation angles (15-45 degrees relative to fiber direction), and spacing. This local quality control ensures that incisions provide sufficient flowability for shaping while minimizing damage to mechanical strength by avoiding excessive fiber disruption.
Solution Approach 2:
The prepreg base material consists of a composite structure combining continuous fibers with controlled incisions, creating a hierarchical composite that exhibits both flowability (from segmented structure) and mechanical strength (from continuous fiber segments and matrix resin).
3Adaptability or versatility
If chopped strands are used in SMC molding method, then flowability is improved, but fiber distribution uniformity and orientation regularity deteriorate
Solution Approach 1:
The incisions are made in advance during prepreg manufacturing, establishing a predetermined fiber segmentation pattern before molding. This preliminary action ensures uniform fiber distribution and regular orientation throughout the molded product, eliminating the randomness associated with chopped strand SMC methods.
4Stability of the object's composition
If continuous fibers are arranged regularly in prepreg, then mechanical property uniformity is improved, but ability to produce complicated three-dimensional shapes deteriorates
Solution Approach 1:
By segmenting the continuous fibers through controlled incisions, the prepreg base material can maintain regular fiber arrangement for mechanical uniformity while allowing the segmented bundles to flow and conform to complicated three-dimensional mold shapes during the molding process.
Data Source
Figure 1
Figure 2(a)~3A
Figure 3B~4B
AI summary
A prepreg base material which comprises many reinforcing fibers arranged in one direction and a matrix resin present among the many reinforcing fibers. The prepreg base material has, throughout the whole surface, many incisions each extending in a direction crossing the reinforcing fibers, substantially all of the reinforcing fibers having been divided by one or more of the incisions. The reinforcing fiber segments formed by division by the incisions have a length (L) of 10-100 mm. The prepreg base material has a thickness (H) of 30-300 µm, and the content by volume (Vf) of the reinforcing fibers in the prepreg base material is 45-65%.