Nanoparticle-Reinforced Nanofiber Interlayer for Composite Tensile Strength

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Solution Overview

Problem

Current fiber-reinforced polymer composite materials face challenges in achieving enhanced tensile strength while maintaining the carbon fiber volume fraction, as existing interlayer reinforcements primarily focus on improving fracture toughness and impact resistance, leaving tensile strength and delamination issues unaddressed.

Innovation Solution

A novel interlayer made of nanoparticle-reinforced polymer nanofibers with diameters ranging from 30 to 300 nanometers, formed into a fractal structure through electrospinning and ultrasonic welding, which enhances load transfer mechanisms across lamina interfaces without altering the carbon fiber volume fraction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If traditional interlayer reinforcements (polymer fibers, nanofibers) are used to improve fracture toughness and impact resistance, then Mode I and Mode II fracture toughness increase, but tensile strength remains insufficient and delamination issues persist

Engineering Contradiction:

Improvetensile strengthVSAvoiddelamination resistance

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The invention uses a composite interlayer system combining polymer nanofibers with carbon nanotubes. The nanofibers provide bulk reinforcement and fracture toughness, while the carbon nanotubes embedded within the nanofibers provide tensile strength and delamination resistance through their high aspect ratio and strong bonding capabilities. This composite approach allows simultaneous improvement of multiple mechanical properties that cannot be achieved with single-material reinforcements.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The invention applies different reinforcement mechanisms at different scales and locations within the interlayer. Carbon nanotubes are specifically positioned within the polymer nanofiber matrix to provide localized tensile strength and delamination resistance, while the overall nanofiber structure provides fracture toughness. This localized quality distribution allows each component to address specific failure modes effectively.

Inventive Principle:

Principle #3Local quality

2Strength

If more layers of fabric are added to increase strength, then composite strength improves, but weight increases and manufacturing complexity increases

Engineering Contradiction:

Improvecomposite strengthVSAvoidcomposite weight

Core Design Contradiction:

StrengthVSWeight of moving object

Solution Approach 1:

The invention changes the fundamental parameters of the interlayer by using nanoscale reinforcements (nanofibers with diameters of 1-100 nm) instead of traditional microscale fibers. This parameter change at the nanoscale allows for significantly higher reinforcement efficiency and strength-to-weight ratio, achieving the required strength with fewer layers and less material, thereby reducing overall weight.

Inventive Principle:

Principle #35Parameter changes

3Strength

If thermoplastic fibers are melt-bonded or stitched to create interlayer reinforcement, then fracture toughness improves, but the process complexity and manufacturing time increase

Engineering Contradiction:

Improvefracture toughnessVSAvoidmanufacturing speed

Core Design Contradiction:

StrengthVSProductivity

Solution Approach 1:

The invention replaces complex mechanical bonding processes (stitching, mechanical interlocking) with a more efficient combination of electrostatic forces and thermal processing. The polymer nanofibers can be bonded to the carbon fiber surface through controlled thermal processing and electrostatic attraction, eliminating the need for time-consuming mechanical stitching operations while achieving equivalent or superior bond strength.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention utilizes phase transition of the polymer nanofibers during processing. The nanofibers are applied in a processed state and then thermally treated to transition from a loose state to a bonded state, creating strong interlayer adhesion through controlled phase change rather than complex mechanical processes.

Inventive Principle:

Principle #36Phase transitions

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 solution significantly increases tensile strength by up to 30% and fracture toughness by up to 50% and 300% in Modes I and II, respectively, while maintaining the carbon fiber volume fraction, effectively addressing delamination and improving overall composite performance.

Implementation Method 1

formed into a fractal structure through electrospinning

Methodology Applied

Scientific EffectElectrospinning: Electrohydrodynamics

Implementation Method 2

ultrasonic welding, which enhances load transfer mechanisms

Methodology Applied

Scientific EffectUltrasonic welding: Ultrasonic Vibration

Data Source

PatentUS12163257B2Process for making hybrid (fiber-nanofiber) textiles through efficient fiber-to-nanofiber bonds comprising novel effective load-transfer mechanisms

Publication Date: 2024.12.10 ADVANCED MATERIALS DESIGN & MFG LTD

AI summary

The nanoparticles-reinforced nanofibers, which include the nanoparticle reinforcements (individually or as agglomerates) as protrusions with an area of size between 30 nm and 8 microns, which are used as anchors between the polymer nanofibers and the polymer matrix system of the final multilayer composite.