Damage and Repair of Aerospace Composite Materials / Y. Charles Lu.

Format:

Book

Author/Creator:

Lu, Y. Charles, author.

Language:

English

Subjects (All):

Composite materials.

Physical Description:

1 online resource (146 pages)

Edition:

1st ed.

Place of Publication:

Warrendale, Pennsylvania, USA : SAE International, 2019.

Summary:

Reports the latest developments on the detection and repair of composite structures from the perspective of ten SAE technical papers. This micro-collection of papers offers an overview of composite utilization on large-scale commercial aircraft as well as an outline of general damage inspection and repair of composite structures.

Contents:

Cover

OVERALL COMPOSITE USAGE

CHAPTER 1 Composite Structure Utilization-Commercial Airplanes

Introduction

Airplane Structure

Honeycomb Structure

Core Materials

Foam Core

Fluted Core

Syntactic Core

Nomex Core

New Generation Aramid Core

Carbon/Carbon Core

Laminate Materials

A-Stage Materials

Carbon Fiber Reinforcement

Kevlar Fiber Reinforcement

Glass Fiber Reinforcement

B Stage Materials

Carbon/Epoxy Prepreg

Kevlar/Epoxy Prepreg

Fiberglass/Epoxy Prepreg

Adhesives

Laminate Structure

Design Considerations

Manufacturing Considerations

Maintenance Considerations

In-Service Inspection

In-service Repairs

Nondestructive Inspection of Composite Structure

Tap Testing

Automated Tap Test Devices

Ultrasonics

Generation of Two and Three Dimensional Images to Produce Wide Area Inspection Methods

A-Scan Mode

Wide Area Inspections Aided by C-Scan Mode

Mechanics of C-Scan System

Low Frequency Bond Testing

Mechanical Impedance Analysis

Thermography

Conclusion

Contact Information

References

DAMAGE DETECTION OF COMPOSITE STRUCTURES

CHAPTER 2 Porosity Assessment in Large Composite Components: Realization and Challenges

Typical Defects in Composite Structures

Ultrasonic Inspection Techniques

Semi-Automated Inspection System

Automated Inspection System

Defects Signature - Pulse Echo

Defects Signature - Through Transmission

Porosity Assessment - Pulse Echo

Porosity Curves Development

Void Content Assessment

Thickness Dependency

Averaging

Frequency Dependency

Morphology Dependency

Laminar Indications Area

Pulse Echo Porosity Assessment Limitation

Attenuation vs Void Content: Porosity Curves

Transfer Values

Arithmetic for Transfer Value.

Transfer Value - Material Composition

Transfer Value - Surface Coating

Transfer Value - Interface

Porosity Assessment - Through Transmission

Porosity Assessment - Through Transmission Results

Summary/Conclusions

CHAPTER 3 Detecting Damage and Damage Location on Large Composite Parts Using RFID Technology

Presentation of the Solution

Acoustic Ultrasonic

Technology/Application Discriminators

Technology Inhibitors

Accelerometers

3. Radio Frequency (RF) Sensors (Shock Vibration)

Technology Tests

Sensor Positioning/Location

Radio Frequency (RF) Sensors (Shock Vibration)

Test Results

Conclusions and Recommendations

Acknowledgements

CHAPTER 4 Discrimination between Damaging and Non-Damaging Impact Events on Composite Structure using SHM Sensor Signal Analysis

Experimental Approach

Experimental Results

Impact Damage Classification Based on Sensor Signal Characterisitcs

Acknowledgments

CHAPTER 5 AFP Automated Inspection System Performance and Expectations

Inspection Process Overview

Ply Boundary Inspection

Overlap/Gap Inspection

Inspection User Interface

Inspected Part Model

Overlap/Gap Interface

Fully-Automatic

Semi-Automatic

Pointing to Defects

Inspection Time

Ply Boundary

Overlap and Gap

Inspection Data

Accuracy

Ply Report

Data Volume

Data Value and Utility

Resource Burden

Hardware Cost

Summary/Conclusions.

Contact Information

Definitions/Abbreviations

DAMAGE REPAIR OF COMPOSITE STRUCTURES

CHAPTER 6 Design and Evaluation of Novel Composite Aircraft Repairs

Typical Metallic Doubler Installation

Typical Composite Doubler Installation

Assessment of DC-10 Composite Doubler Design

Fatigue Tests: Flawed Specimens

Fatigue Tests: Baseline (Unflawed) Specimens

Effects of Impact

Finite Element Analysis

Damage Tolerance

Repair Design Validation

Nondestructive Inspection (NDI)

Pitch/Catch Impulse Testing

Pilot Program

CHAPTER 7 Design and Analysis of Aeronautical Repair: Fastened × Bonded

Finite Element Model

Damaged Plate

Bonded Repair

Computational Toll (SAJ)

Fastened Repair

Results

Summary and Conclusions

CHAPTER 8 Economical Repair of Damaged and Discrepant Holes in Metals and Composites

Expanded Bushing Methods

Composite or Composite/Metal Joint Repair

Panel Repair

Summary

CHAPTER 9 New Cutting Tools for Repairs of Composites

1. Introduction

1.1 Milling Thin CFRP Layers

1.2 Scarfing of CFRP: The Right Strategy

1.3 The Right Tools Scarfing CFRP

2. Experimental Testing and Results

3. Conclusions

CHAPTER 10 End-Effector for Automatic Shimming of Composites

Description of Concept

Shimming End-Effector

Extrusion Head

Hot-End

Bed Heating System

Control System

Validation of the Concept: Results

Conclusions

References.

Notes:

Includes bibliographical references and index.

ISBN:

9781523140336

152314033X

9780768001181

0768001188

9780768001129

0768001129

OCLC:

1302007075