Care and Repair of Advanced Composites
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1 Care and Repair of Advanced List of Chapters: Foreword Preface to the Preface to the First Edition Chapter 1 Introduction to and Care of Composite Parts 1.1 Definition of 1.2 History of Composite Materials 1.3 Advantages and Disadvantages of Advantages of Disadvantages of Advantages of Thermoset Resin Disadvantages of Thermoset Resin Advantages of Thermoplastic Resin Disadvantages of Thermoplastic Resin 1.4 Applications of to Modern Aircraft, Yachts, Cars, and Trains Early Aircraft Structures Modern Aircraft Structures and Other Applications 1.5 Care of Composite Parts Sources of Damage to Composite Parts Physical or Chemical Damage Deterioration in Normal Service Avoidance of Damage and Reduction of Deterioration in Service 1.6 References Chapter 2 Materials 2.1 Fiber Reinforcement Comparison of Some High-Performance Fibers and Common Metals Glass Fiber Glass Manufacture Glass Fiber Manufacture Carbon Fibers Carbon Fiber Manufacture Future Development Further Details of Carbon and Graphite Fibers Aramid Fibers Boron Fibers Other New Fibers 2.2 Forms of Reinforcement Tapes Fabrics Woven Fabric Weave Styles Effect of Weave Style Noncrimp Fabrics Nonwoven Randomly Oriented Mats Fiber and Fabric Glossary 2.3 Fiber Sizing and Finish Glass Fiber Finishes Carbon Fiber Finishes Aramid Fiber Finishes
2 Care and Repair of Advanced Sizing and Finish for New Types of Fibers and Fabrics 2.4 Matrix (Resin) Systems Thermoplastic Resins Thermosetting Resins Properties Required of Matrix Resins and Adhesives Physical and Chemical Properties Mechanical Properties Epoxy-Based Matrix Resins and Adhesives for Aerospace Use Epoxy and Phenolic Pre-Pregs and Film Adhesives Curing Stages Mixing and Mix Ratios for Epoxy Wet Resins Weighing Mixing Definitions Related to Mixing and Application Polyester Resins 2.5 Adhesives Liquid and Paste Adhesives Foaming Adhesives Film Adhesives Glue-Line Thickness Control In-Service Effects on Resin Systems 2.6 Core Materials Wood Foam Core Materials Material Types Foam Density Advantages and Disadvantages Honeycomb Core Materials Honeycomb Material Types Cell Shapes Honeycomb Densities and Cell Sizes Fluted Core Syntactic Core 2.7 Syntactic Foams and Potting Compounds Filler Materials for Potting Compounds, Resin Systems, and Adhesives Other Fillers 2.8 Protective Coatings Sealants Old-Generation Thiokol Sealants New-Generation Polythioether Sealants Silicone Sealants Viton Rubber Sealants Primers Finishes Conductive Coatings Erosion-Resistant Coatings Other Protective Coatings 2.9 References 2.10 Bibliography Chapter 3 Handling and Storage 3.1 Shipping and Receiving 3.2 Temperature Requirements 3.3 Storage Practices Temperature Requirements Dry Fabrics Storage of Pre-Preg, Film, and Paste Adhesives, Potting Compounds, and Primers Storage of Sealants for Aircraft Use Storage of Consumable Items for Composite and Bonded Metal Repairs Cleanliness and Damage Prevention Moisture Damage Prevention Identification Release Notes and Approved Certificates 3.4 Shelf Life/Out Time 3.5 Kitting 3.6 Recertification 3.7 Care of Materials in the Hangar or Workshop Chapter 4 Manufacturing Techniques 4.1 Filament Winding 4.2 Lay-Up Methods for Fabrics and Tapes Hand Lay-Up (Wet and Pre-Preg Laminating) Automated Lay-Up 4.3 Pultrusion 4.4 Resin Transfer Molding 4.5 Injection Molding
3 Care and Repair of Advanced 4.6 Tow Placement 4.7 Press Molding 4.8 Vacuum Bonding 4.9 Autoclave Bonding 4.10 Oven Curing 4.11 References 4.12 Other Useful Reading Chapter 5 Original Design Criteria 5.1 Principal, Primary, and Secondary Structures Sources of Damage to Composite Airframe Components Consequences of Failure 5.2 Types of Composite Structures Monolithic Laminated Structures (Solid Laminates) Sandwich Structures 5.3 Ply Orientation Warp Clock Balance and Symmetry Nesting and Stacking 5.4 Core Orientation 5.5 Operational Environment Temperature Humidity Contaminants Erosion Thermal Stresses Hygrothermal Effects Fire Resistance 5.6 Electrical Requirements Galvanic Corrosion Electromagnetic Interference Electrostatic Discharge Lightning Strike Energy Dispersion Radar Transmissivity 5.7 Mechanical Requirements Tensile and Flexural Strength Stiffness Fatigue Impact Resistance (Damage Tolerance) Creep 5.8 Attachments/ Bonded Mechanically Fastened/Riveted 5.9 Other Design Requirements Aerodynamic Smoothness Weight and Balance 5.10 References Chapter 6 Safety and Environment 6.1 Introduction 6.2 Workshop Conditions for Good Bonding 6.3 Respirable Fibers and Dust Fiberglass Carbon and Graphite Fibers Aramid Fibers Sanding Dust 6.4 Fumes and Vapors Resin Fumes Solvent Vapors Sealant Vapors Coatings Fuel Acid Fumes and Splash Exposure Limits 6.5 Skin Contact Fibers in Contact with the Skin Resins in Contact with the Skin Solvents in Contact with the Skin Selection of Suitable Gloves Skin Creams for Personal Protection 6.6 Material Safety Data Sheets 6.7 Exothermic Reactions 6.8 Waste Disposal 6.9 Safety Procedures Emergency Action First-Aid Procedures General Safety Procedures Personal Safety Precautions Dermatitis 6.10 Action in the Event of a Chemical Spillage 6.11 Explosion Risk 6.12 Static Discharge and Fire Prevention Static Discharge Prevention Fire Prevention 6.13 Safety Requirements for Electrical Appliances 6.14 ISO Environmental Management Standards 6.15 References 6.16 Bibliography Chapter 7 Damage and Repair Assessment 7.1 Visual Inspection 7.2 Tap Test 7.3 Ultrasonic Inspection 7.4 X-Ray Methods 7.5 Eddy Current Inspection 7.6 Thermography 7.7 Bond Testers 7.8 Moisture Meters
4 Care and Repair of Advanced 7.9 Interferometry/Shearography 7.10 Damage Types 7.11 Sources of Mechanical Damage 7.12 Damage Mapping 7.13 Assessment of Damage Significance 7.14 References Chapter 8 Source Documents 8.1 Revision Systems 8.2 Effectivity 8.3 Drawing Numbering Systems 8.4 Internal Documents 8.5 Material and Process Specifications 8.6 Original Equipment Manufacturer Documents 8.7 Regulatory Documents 8.8 Air Transport Association of America ATA 100 System 8.9 Aircraft Maintenance Manual 8.10 Component Maintenance Manual 8.11 Overhaul Manual 8.12 Illustrated Parts Catalog 8.13 Structural Repair Manual 8.14 Engine Manual Chapter 9 Structural Repair Manual (SRM) Repair Method Selection 9.1 Component Identification 9.2 Damage Classification Damage Terminology Critical Areas Allowable/Negligible Damage Repairable Damage Overhaul or Replace Other Considerations 9.3 Repair Methods Speedtape Resin Sealing Potted Repairs Bolted Doublers (Metal Plates) and Bonded Doublers (Composite Patches) Pre-Cured Doublers Versus Co-Cured Doublers Room-Temperature Wet Lay-Up Elevated-Temperature Wet Lay-Up Pre-Preg Repairs Scarfed and Stepped Lap Repairs Composite Repairs to Metals 9.4 References Chapter 10 Repair Techniques 10.1 Preparation Paint Removal Disbonding Methods Disbonding Adhesively Bonded Metal Parts Disbonding Composite Parts Damage Removal Damage Removal from Metal Parts Removal of Skin and Doubler Material Damage Removal from Composite Parts Removal of Core Material Removal of Surface Corrosion Moisture and Contamination Removal Surface Preparation of Repair Sanding and Ply Determination Abrading Taper Sanding/Scarfing Step Sanding and Cutting Water Break Test Metallic Surface Preparation 10.2 Typical Repairs Edge Band Repairs Repair of Damage to Core and One Skin Repair of Damage to Core and Both Skins Hybrid Repairs Blind Repairs Injected Repairs Solid Laminate Repairs Potted Repairs Metal-to-Metal Bonding Plastic Welding (Solvent or Heat) 10.3 Adhesive Usage 10.4 Bagging Materials, Release Films, Release Fabrics, Peel Plies, Breather Cloths, Bleeder Cloths, Bleed-Out Fabrics, and Application Techniques Terminology Selection Criteria Surface Versus Envelope Bagging Pleating Bagging Sequence
5 Care and Repair of Advanced Vacuum Requirements and Principles Vacuum Bonding Application of Vacuum Pressure to Plates and Assemblies Using Nonperforated Honeycomb Practical Techniques to Ensure Adequate Applied Vacuum Pressure to Parts Under Repair Caul Plate and Dam Usage Vertical Bleed Method Squeeze-Out (Edge Bleed-Out) Method Zero-Bleed Method Ply Compaction and Debulking Debagging Precautions and Typical Problems 10.5 Curing Stages and Temperatures Heating Techniques Curing Stage Definitions Low-Temperature Cure Elevated-Temperature Cure Direct Versus Indirect Heating Ramp Rates and Soak Cycles Temperature Control and Monitoring Thermocouple Placement Temperature Control Problems Hot Bonder and Heater Blanket Usage Heat Sinks Thermocouples Distortion of Parts During Heating or Cooling 10.6 Post-Repair Inspection 10.7 Surface Restoration 10.8 References Chapter 11 Mechanical Fastening Systems 11.1 Introduction 11.2 Fastener Types Fastener Standards Fastener Compatibility Rivets Solid Rivets Blind Rivets Hollow End Rivets 11.3 Screws, Nuts, and Bolts Specialty Fasteners (Special Bolts) Lockbolts Hex Drive Bolts Specialty Blind Bolts 11.4 Spacers, Bolt Inserts, and Grommets 11.5 Hole Preparation Drilling Hole Sizes and Tolerances Edge Distance and Fastener Pitch Hole Protection 11.6 Fastener Installation and Removal Fastener Installation Fastener Removal 11.7 Fastener Substitution 11.8 Bonded Fasteners 11.9 Composite Fasteners References Chapter 12 Documentation 12.1 Process Control Documents Cure Chart/Data Strip Routine and Nonroutine Work Documents Routine Work Documents Nonroutine Work Documents Nondestructive and Destructive Inspection Data Coupon Test Results Clean-Room Temperature and Humidity Return to Service/Log Book Sign-Offs 12.2 Calibration Records 12.3 Material Control Records 12.4 Component Documentation 12.5 Training Records Chapter 13 Shop Equipment and Hand Tools 13.1 Hand Tools and Techniques Drills High-Speed Grinders Cutting Utensils Hand Routers Orbital Sanders Cast Cutter (Oscillating Saw) Painting Equipment Resin Applicators 13.2 Shop Equipment Bandsaws Air Compressors 13.3 Heating Devices 13.4 Measuring Devices
6 Care and Repair of Advanced 13.5 Health and Safety Equipment 13.6 References Chapter 14 Tooling and Mold Making 14.1 Introduction 14.2 Caul Plate and Dam Fabrication 14.3 Splash Mold Making 14.4 Release Agents/Films 14.5 Simple Room-Temperature Tooling 14.6 Room-Temperature Curing Pre-Preg Tooling Lay-Up Debulk Procedure Final Bagging Procedure Autoclave Cure Time Limits Step Post-Curing Procedure After Room-Temperature or Low-Temperature Initial Cure Support Structures Initial Release Priming of New Composite Tools Developments in Low-Temperature Curing Materials 14.7 References Chapter 15 Metal Bonding 15.1 Introduction History and Requirements Metal Bonding Epoxy Adhesives Requirements for Adhesives Principles of Adhesion Adhesion Theory Environmental Durability Temperature Effects Humidity Effects Advantages and Disadvantages of Metal Bonding 15.2 Surface Preparation Methods Abrasive Cleaning Pasa-Jell Hydrofluoric Acid Etching Grit Blast/Silane Alodine or Alochrom Boeing Boegel EPII Sol-Gel Process FPL Etch Chromic Acid Anodizing Phosphoric Acid Anodizing Phosphoric Acid Containment System (PACS) Phosphoric Acid Non- Tank Anodizing (PANTA) Metadalic/Sifco Selective Plating (U.K.) Ltd Ciba Laser Pretreatment Other Surface Preparations 15.3 Primers Reasons for Using Primers Primer Types Application of Primers Curing/Drying Thickness Verification 15.4 Handling Primers 15.5 References 15.6 Bibliography Chapter 16 Design Guide for Composite Parts 16.1 Introduction 16.2 Analysis of Reports Received 16.3 Other Required Design Features Not Mentioned in the Analyzed Reports 16.4 References Chapter 17 Repair Design 17.1 General Repair Design Introduction to Repair Design Laminate Loading Tension and Compression Loads and Strains Shear Stress and Strain Poisson s Ratio Repair Philosophy and Design Requirements Certification Load Capacity Repair Categorization 17.2 Laminate Repair Design Introduction to Laminate Repair Design Laminate Repair Design Considerations Stiffness Strength Stability
7 Care and Repair of Advanced Environmental Effects and Protection Operational and Glass Transition Temperatures (T g ) Lightning and Electrostatic Protection Other Repair Design Considerations Laminate Repair Laminate Analysis Techniques for Repair Design Introduction to Simplified Analysis Techniques Elastic Modulus (E) Analysis Strength (F) Analysis Poisson s Ratio (V 0 ) Analysis In-Plane Shear Modulus (G) In-Plane Shear Strength (t) 17.3 Core Repair Design Function and Loading of Core in Sandwich Construction Core Material, Density, and Cell Size Core Repair Design 17.4 Bonded Joint Repair Design Introduction to Bonded Types of Bonded Failure Modes of Bonded Adhesive Behavior in Bonded Adhesive Shear Stress and Strain Elastic and Plastic Adhesive Behavior Temperature and Moisture Effects Joint Adherend Effects Stiffness Imbalance and Thermal Mismatch Recommended Joint Overlaps and Simplistic Analysis Adhesive Peel Stress and Displacement Durability Fatigue, Creep, and Environmental Effects Bonded Joint Repair Considerations Bonded Joint Repair Design 17.5 Mechanically Fastened Introduction to Mechanically Fastened Fastened Laminate Failure Modes Fastener Failure Modes Open-Hole Stress Concentrations Versus Metals Loading of Mechanically Fastened Loaded Fastener Holes Fastener Load Distribution and Joint Geometry Lay-Up Orientation for Fastened Pad-Ups and Hybrid Material Application Fatigue of Fastened Composite Effects of Gaps and Shims Fastener Selection Mechanically Fastened Repairs in Sandwich Panels Fastened Joint Repair 17.6 References 17.7 Bibliography Additional Information Index About the Authors
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