ESDU 98012
Flexibility of, and load distribution in, multibolt lap joints subject to inplane axial loads.
Abstract:
ESDU 98012 introduces a Fortran program, ESDUpac A9812, that computes the bolt loads and flexibilities, and joint extension and flexibility of a multibolt, single row, lap joint loaded in either axial tension or compression. The analysis allows for joints in which the bolts are of different sizes and are not at a regular pitch and in which the thickness and/or width of the joined plates vary between bolt pitches. The analysis may be applied to symmetric double lap joints and joints with multiple rows of bolts provided the rows are identical. The details of the idealisations adopted are explained, and worked examples illustrate the program input and output formats used. The program requires the joint geometry and material properties and the flexibilities of each of the bolts under shear loading. A theory for the calculation of these flexibilities is also described and may be used when they are not available. The program also requires the effective stiffnesses of the plates and an empirical relationship between effective stiffness and plate modulus and bolt diameter is given. However, it is suggested that, if possible, the effective stiffness of the plate to be used should be determined experimentally, and a suitable test procedure is provided. Detailed notes on the major parameters that influence the bolt loads and joint flexibility are included along with figures that illustrate those influences. The joint stiffness value calculated will be particularly useful to represent such a joint when using finite element analysis to determine the gross load distribution through a structure.Indexed under:
Details:
Data Item ESDU 98012  

Format: 

Status: 

Previous Releases:  
ISBN: 

The Data Item document you have requested is available only to subscribers or purchasers.
 Subscribers login here.
 If you are not an ESDU subscriber you can
 find out how to subscribe, or
 purchase this Data Item from the IHS Standards Store.
This Data Item is complemented by the following software:
Name  Details  

ESDUpac A9812 
This program is only available to subscribers. 
The graphs listed below are available only to subscribers.
 Subscribers login here.
 If you are not an ESDU subscriber find out how to subscribe.
This Data Item contains 9 interactive graph(s) as listed below.
Graph  Title 

Figure 1  Variation of f_{b} in one plate with t and lambda for 6.35 and 12.7 mm diameter bolts 
Figure 2  Variation of f_{b} with A_{ps} for the 6.35 mm diameter bolts of Figure 1 at plate thicknesses of 10 and 25 mm and with lambda = 1 x 10^{4} kN mm/rad 
Figure 3  Effective width of plate between identical bolts (see Section 1.4.1.4) 
Figure 4  Effect of varying N on individual bolt loads in a single lap symmetric joint of constant length with equally spaced bolts, loaded in tension 
Figure 5  Effect of varying N on individual bolt loads in a single lap asymmetric joint of constant length with equally spaced bolts, loaded in tension 
Figure 6  Effect of varying N on maximum bolt loads and flexibilities for single lap joints of constant length (single row of bolts equally spaced, joint properties and geometry constant along length) 
Figure 7  Effect of varying N on individual bolt loads in a single lap symmetric joint of constant pitch with joint length varying, loaded in tension 
Figure 8  Effect of varying N on individual bolt loads in a single lap asymmetric joint of constant pitch with joint length varying, loaded in tension 
Figure 9  Effect of varying N on maximum bolt loads and flexibilities for single lap joints of fixed pitch and varying joint length, single row of bolts, joint properties and geometry constant along length) 
Explore ESDU
ESDU Series:
 Aerodynamics
 Aircraft Noise
 Composites
 Dynamics
 Fatigue  Endurance Data
 Fatigue  Fracture Mechanics
 Fluid Mechanics, Internal Flow
 Fluid Mechanics, Internal Flow (Aerospace)
 Heat Transfer
 Mechanisms
 Performance
 Physical Data, Chemical Engineering
 Stress and Strength
 Structures
 Transonic Aerodynamics
 Tribology
 Vibration and Acoustic Fatigue
 Wind Engineering
ESDU Packages:
See this document in context
ESDU Series
 Home  AZ index  Contact Us  Help  About Us  Terms of Use  Privacy Policy  How we use cookies  How to Subscribe 
© 19992019 IHS ESDU, part of IHS Inc.