MECHANICS OF THREADED FASTENERS AND BOLTED JOINTS FOR ENGINEERING AND DESIGN

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Detalles Bibliográficos
Clasificación:Libro Electrónico
Autor principal: FUKUOKA, TOSHIMICHI
Formato: Electrónico eBook
Idioma:Inglés
Publicado: [S.l.] : ELSEVIER, 2023.
Temas:
Bolted joints.
Fasteners.
Screw-threads.
Acceso en línea:Texto completo
Tabla de Contenidos:
  • Intro
  • The Mechanics of Threaded Fasteners and Bolted Joints for Engineering and Design
  • Copyright
  • Contents
  • Preface
  • List of symbols
  • Chapter 1: Thread standards and forms
  • 1.1. Brief history of screw threads and relevant research activities
  • 1.2. Geometry and application purposes of screw threads
  • 1.3. Standards of screw threads
  • 1.3.1. Standard specifications of screw threads
  • 1.3.2. Basic profile of screw threads
  • 1.4. Thread pitch and number of threads
  • 1.4.1. Mathematical expression of Helix
  • 1.4.2. Coarse screw threads and fine screw threads
  • 1.4.3. Number of threads and lead angle
  • 1.4.4. Contact area between male and female threads
  • 1.4.5. Nonsimilarity of threaded fasteners
  • 1.5. Clamping configuration and various threaded fasteners
  • 1.5.1. Bolt-nut connection and stud
  • 1.5.2. Geometric factors affecting mechanical behavior of threaded fasteners
  • 1.5.3. Contact pressure distribution at plate interface and shape of pressure cone
  • 1.6. Strength, thermal and mechanical properties of threaded fastener materials
  • 1.6.1. Materials used for threaded fasteners
  • 1.6.2. Factors to consider in selecting materials
  • Chapter 2: Fundamentals of threaded fasteners
  • 2.1. Strength of threaded fasteners
  • 2.1.1. Occurrence locations of rupture and failure of threaded fasteners
  • 2.1.2. Strength in tightening process
  • 2.1.3. Strength in service condition
  • 2.1.4. Friction coefficients affecting mechanical behavior of bolted joints
  • 2.2. Stiffness of threaded fasteners
  • 2.2.1. Relationship between stiffness and mechanical behavior in bolted joints
  • 2.2.2. Stiffness evaluation using one-dimensional spring elements
  • 2.2.3. Equivalent lengths of engaged threads and bolt head
  • 2.2.4. Compression stiffness of fastened plates.
  • 2.2.5. Evaluation of spring constants composing a bolted joint by FEM
  • 2.2.6. Relationship between mechanical behavior and spring constant of each part of a bolted joint
  • 2.3. True profile of cross-section of screw threads
  • 2.3.1. Cross-section of triangular screw threads [41]
  • 2.3.2. Cross-section of screw threads of various shapes [42]
  • 2.4. True cross-sectional area of screw threads
  • 2.5. Finite element models with helical shape of screw threads
  • 2.5.1. Previous modeling schemes of helical thread model
  • Method-1
  • Method-2
  • Method-3
  • Method-4
  • 2.5.2. Helical thread modeling using mathematical expressions of cross-section [49]
  • 2.6. Interface stiffness in bolted joints
  • 2.6.1. Interface stiffness at mating surfaces
  • 2.6.2. Interface stiffness in normal and tangential directions [56]
  • 2.6.3. Simple formula for evaluating interface stiffness in normal direction
  • 2.7. Thermal contact resistance in bolted joints
  • Chapter 3: Mechanics of the tightening process of threaded fasteners
  • 3.1. Summary of various tightening methods and comparison of tightening characteristics
  • 3.2. Torque control method
  • 3.2.1. Relationship between tightening torque and axial bolt force
  • 3.2.2. Simple equation relating tightening torque to axial bolt force through the friction coefficient
  • 3.2.3. Advantages of the torque control method and influencing factors on tightening accuracy
  • Inclination of nut- or bolt head-bearing surface [69]
  • Warping and flatness on plate surface
  • 3.2.4. Self-locking criteria and efficiency of screw threads
  • 3.2.5. Measuring method of axial bolt force, tightening torque, and friction coefficient
  • 3.2.6. Behavior of torque and axial bolt force after releasing tightening torque
  • 3.2.7. Simple strategy for reducing bolt force scatter [75].
  • 3.2.8. Tightening characteristics and strength of bottoming studs
  • 3.2.9. Bolt strength in tightening process
  • 3.3. Elastic angle control method
  • 3.3.1. Tightening principle
  • 3.3.2. Equation relating axial bolt force to nut rotation angle by taking account of surface roughness
  • 3.3.3. Application range and tightening guidelines
  • Suitable application range
  • Guidelines for tightening operation
  • 3.4. Direct tension method using hydraulic tensioner
  • 3.4.1. Tightening principle
  • 3.4.2. Effective tensile coefficient
  • 3.4.3. Effects of surface roughness and nut rundown torque
  • 3.4.4. Application range and tightening guidelines
  • Suitable application range
  • Guidelines for tightening operation
  • 3.5. Thermal expansion method using bolt heater
  • 3.5.1. Tightening principle [81]
  • 3.5.2. Simplified model for evaluating tightening process
  • 3.5.3. Equation relating axial bolt force to heating temperature [82]
  • 3.5.4. Application range and tightening guidelines
  • Suitable application range
  • Guidelines for tightening operation
  • 3.6. New tightening method utilizing real-time measurement of nut factor [85]
  • 3.6.1. Development intention
  • 3.6.2. Tightening principle
  • 3.6.3. Verification of proposed method using prototype tightening device
  • 3.7. Sequential tightening of multibolted joints and induced elastic interaction
  • 3.7.1. Tightening operation of bolt-nut connections and elastic interaction
  • 3.7.2. Effect of joint geometry on elastic interaction
  • 3.7.3. Estimation of bolt force scatter and optimal tightening procedure
  • 3.8. Energy required for tightening threaded fasteners
  • 3.8.1. Tightening energy consumed in the torque control method [94]
  • 3.8.2. Calculation of tightening energy for various influencing factors
  • Chapter 4: Static and fatigue strengths of threaded fastener.
  • 4.1. Load distribution and ratio of flank loads of engaged threads
  • 4.1.1. Load distribution in bolt-nut connections
  • 4.1.2. Load distribution in eyebolts and eyenuts
  • 4.1.3. Analysis of ratio of flank loads by FEM
  • 4.2. Static strength and stress concentration in threaded fasteners
  • 4.2.1. Stress concentration and stress concentration factor
  • 4.2.2. Stress concentration in threaded fasteners
  • 4.2.3. Mechanism of stress concentration at thread root
  • 4.2.4. Evaluation of stress concentration at thread root
  • 4.2.5. Stress concentration and plastic deformation of threaded fasteners
  • 4.2.6. Reduction strategy of stress concentration at thread root
  • 4.3. Stress distribution along thread root
  • 4.3.1. Stress concentration in bolt-nut connections
  • 4.3.2. Effect of thread pitch and number of threads
  • 4.3.3. Stress concentration of engaged threads in main body side
  • 4.4. Fatigue failure of screw threads
  • 4.4.1. Relationship between metal fatigue and stress amplitude
  • 4.4.2. Fatigue failure of threaded fasteners
  • 4.4.3. Influencing factors on fatigue strength of screw threads
  • 4.5. Evaluation method of fatigue strength of threaded fasteners
  • 4.5.1. Summary of the bolted joint diagram
  • 4.5.2. Essential problems involved in the bolted joint diagram
  • 4.5.3. Verification of bolted joint diagram by FEM
  • 4.5.4. Axial bolt force vs external force diagram
  • 4.5.5. Estimation method of fatigue strength and stress amplitude of threaded fasteners
  • 4.6. Separation phenomena of plate Interface and stress amplitude
  • 4.6.1. Stress amplitude in bolted joints under eccentric external load
  • 4.6.2. Verification of interface separation phenomena by FEM
  • 4.7. Stress amplitude along thread root
  • 4.7.1. Finite element analysis using helical thread models
  • 4.7.2. Stress amplitude and fatigue failure of bolt-nut connections.
  • 4.7.3. Stress amplitude and fatigue failure of engaged threads in main body side [20]
  • 4.7.4. Stress amplitude and plastic deformation [20]
  • 4.8. Improvement measures of fatigue strength of threaded fasteners
  • Chapter 5: Bolted joints under thermal load
  • 5.1. Fundamentals of thermal and mechanical behaviors of bolted joints
  • 5.1.1. Thermal deformation and thermal stress [120]
  • 5.1.2. Mechanism of bolt force variation due to thermal load
  • 5.1.3. Simple formula for calculating bolt force variation
  • 5.2. Evaluation method of amount of heat transferred through contact surface
  • 5.2.1. Measuring method of thermal contact coefficient
  • 5.2.2. Thermal contact coefficient at interface composed of identical materials [122]
  • 5.2.3. Thermal contact coefficient at interface composed of dissimilar materials [121]
  • 5.3. Evaluation method of amount of heat transferred through a small gap [124]
  • 5.4. Thermal contact coefficient and apparent thermal contact coefficient in bolted joints
  • 5.5. Analysis of thermal and mechanical behaviors of bolted joints by FEM
  • 5.5.1. Evaluation of thermal and mechanical behaviors using an axisymmetric FE model
  • 5.5.2. Evaluation of thermal and mechanical behaviors using a three-dimensional FE model
  • 5.6. Seizure of threaded fasteners
  • 5.6.1. Conditions prone to seizure
  • 5.6.2. Hypothesis proposed on seizure occurrence
  • Chapter 6: Loosening of threaded fasteners
  • 6.1. Rotation loosening and nonrotation loosening
  • 6.2. Why bolted joints are easy to loosen
  • 6.3. Bolt force reduction due to rotation loosening
  • 6.3.1. Mechanism of rotation loosening
  • 6.3.2. Bolt force reduction due to return rotation of nut
  • 6.3.3. Prevention methods of rotation loosening
  • 6.3.4. Finite element simulation of rotation loosening caused by repeated shear load.

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