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Marine Componsites

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Marine Componsites ( marine-componsites )

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Table of Contents Marine Composites Joints and Details.........................................................................................................166 Secondary Bonding .................................................................................................166 Hull to Deck Joints..................................................................................................167 Bulkhead Attachment..............................................................................................169 Stringers ..................................................................................................................170 Stress Concentrations ..................................................................................................174 Hauling and Blocking Stresses...............................................................................174 Engine Beds............................................................................................................174 Hardware .................................................................................................................174 Sandwich Panel Testing...............................................................................................177 Background .............................................................................................................177 Pressure Table Design ...........................................................................................177 Test Results ............................................................................................................177 Testing of Structural Grillage Systems ...................................................................178 Hydromat Test System (HTS).................................................................................180 Performance Fatigue ..........................................................................................................................181 Composite Fatigue Theory......................................................................................184 Fatigue Test Data ...................................................................................................185 Impact ...........................................................................................................................187 Impact Design Considerations................................................................................187 Theoretical Developments ......................................................................................190 Delamination .................................................................................................................191 Water Absorption..........................................................................................................194 Blisters ..........................................................................................................................197 Case Histories ..............................................................................................................202 US Coast Guard 40 foot Patrol Boats .....................................................................202 Submarine Fairwater...............................................................................................203 Gel Coat Cracking...................................................................................................204 Core Separation in Sandwich Construction............................................................205 Failures in Secondary Bonds..................................................................................206 Ultraviolet Exposure................................................................................................206 Temperature Effects .....................................................................................................207 Failure Modes...............................................................................................................209 Tensile Failures.......................................................................................................210 Membrane Tension............................................................................................211 Compressive Failures .............................................................................................213 General Buckling ...............................................................................................213 Crimping & Skin Wrinkling .................................................................................214 Dimpling with Honeycomb Cores ......................................................................214 Bending Failure Modes...........................................................................................215 Sandwich Failures with Stiff Cores....................................................................216 Sandwich Failures with Relatively Soft Cores...................................................217 First Ply Failure.......................................................................................................218 vi

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