3 Detachable Joints and Fastening Methods
Nomenclature
- A
- effective area of contact surface, mm2
- d
- major diameter, mm
- d 0
- diameter of bolt shank, mm
- d 1
- minor diameter, mm
- d 2
- mean diameter, mm
- F
- external tensile load per bolt, N
- F i
- load carried by individual bolt in a group, N
- F max
- maximum load in a bolt group, N
- F s
- shear load acting on each bolt, N
- F Σ
- total external load, N
- f
- coefficient of friction
- h
- thread height, mm
- i
- the number of contact surface
- K s
- antiskid factor
- k b
- stiffness of the bolt
- k m
- stiffness of the clamped members
- L i
- distance from y‐axis to the bolt axis, mm
- L min
- minimum length of bearing surface, mm
- l
- lead, mm
- M
- overturning moment, N mm
- n
- number of threads, start
- p
- pitch, mm
- Q
- total load in the bolt, N
- Q′ p
- resultant load in the clamped members, N
- Q p
- preload, N
- r i
- radial distance between centroid and ith bolt centre, mm
- S
- safety factor
- S p
- safety factor for crushing
- T
- torque, N mm
- T 1
- frictional torque in the thread, N mm
- T 2
- frictional torque at bearing surface, N mm
- W
- effective section modulus, mm3
- z
- number of bolts in a joint group
- α
- thread angle, °
- β
- helix angle, °
- γ
- lead angle, °
- λ
- deflection, mm
- σ
- tensile stress, MPa
- σ ca
- calculated tensile stress, ...
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