Effect of clamping pressure and joint geometry on corrosion induced bowing and distortion of bolted joints in weathering steel

1985 ◽  
Vol 5 (3) ◽  
pp. 213-238 ◽  
Author(s):  
R.L. Brockenbrough ◽  
W.P. Gallagher
Keyword(s):  
Bolted Joints ◽  
Weathering Steel ◽  
Joint Geometry ◽  
Clamping Pressure

Ultrasonic measurement of self-loosening in bolted joints

2011 ◽  
Vol 226 (7) ◽  
pp. 1869-1884 ◽  
Author(s):  
MB Marshall ◽  
R Lewis ◽  
T Howard ◽  
H Brunskill
Keyword(s):  
Steady State ◽  
Ultrasonic Measurement ◽  
Bolted Joints ◽  
Catastrophic Failure ◽  
Interface Pressure ◽  
Rapid Reduction ◽  
Contact Conditions ◽  
Joint Integrity ◽  
Clamping Pressure ◽  
Insight Into

Self-loosening of bolted joints in response to vibration can lead to the catastrophic failure of a range of engineering components and structures. Many techniques employed to study this phenomenon focus on directly measuring the pre-load remaining in the bolt itself, and offer little insight into the behaviour of the clamped interface. In this study, a non-intrusive ultrasonic reflection-based technique is used to first characterize interface pressure in the joint, and then determine the rate at which relaxation occurs. A key advantage of the technique is that it does not require the modification of the contact conditions, and rather utilizes the spring-like behaviour of a rough surface interface when subject to ultrasonic excitation. A series of different bolt torques were investigated, along with the inclusion of both plain and spring washers under the bolt head. All test samples were subjected to an oscillating fixed–displacement vibration cycle. An initial rapid reduction in interface clamping pressure was observed, followed by a more steady-state period. Increasing bolt torque was seen to enhance joint integrity, whereas both the plain and spring washers showed little improvement. The spring washer was observed to extend the secondary steady-state phase of loosening, though as the majority of pre-load was removed prior to this period any change was largely unbeneficial.

Fretting Fatigue Failure in Friction Grip Bolted Joints

1968 ◽  
Vol 10 (5) ◽  
pp. 434-437 ◽  
Author(s):  
R. Spiers ◽  
M. S. G. Cullimore
Keyword(s):  
Fatigue Failure ◽  
Fatigue Cracking ◽  
Double Cover ◽  
Fatigue Tests ◽  
Bolted Joints ◽  
Cover Plate ◽  
Butt Joints ◽  
Joint Geometry ◽  
Cause Of Failure ◽  
Fretting Damage

Fatigue tests on a large number of double cover plate butt joints showed that the cause of failure in the majority of cases was by cracks originating in an annular area of fretting damage around the bolt hole. The nature of the fretting is discussed and the variation with load amplitude of the size of the annular area is described. Several well defined patterns of fatigue cracking were observed. These are described and their associated crack origins classified and related to the joint geometry and load levels.

Identification of damage stages in bolted metallic joints for different joint geometries and tightening torques using statistical analysis

2019 ◽  
Vol 23 (5) ◽  
pp. 911-923 ◽  
Author(s):  
Amr Abd-Elhady ◽  
Ahmed Abu-Sinna ◽  
Mahmoud Atta ◽  
Hossam El-Din M Sallam
Keyword(s):  
Analysis Of Variance ◽  
Failure Load ◽  
Diameter Ratio ◽  
Hole Diameter ◽  
Experimental Results ◽  
Bolted Joints ◽  
Tightening Torque ◽  
Joint Geometry ◽  
Joint Width ◽  
The Impact

The main parameters controlling the structural behavior of bolted joints are the tightening torque ( T) and the joint geometry such as the edge distance ( e) to the bolt hole diameter ( D) ratio ( e/ D) and the joint width ( W) to the hole diameter ratio ( W/ D). In the first part of this study, the effects of W/ D and T, with a constant value of e/ D ( e/ D = 3), have been studied experimentally. Three values of W/ D (2.25, 3, and 3.75) with six values of T (0, 10, 15, 20, 25, and 30 N m) have been chosen to construct 18 assemblies. Experimental results highlighted the impact of W/ D, and T, on the different failure stages of bolted double-lap metallic joints. In the second part of this study, analysis of variance has been adopted to analyze the effects of T and W/ D in addition to the effect of e/ D which has been studied previously by the authors. The present experimental results showed that the value of applied load at which the sticking failure occurred increased by increasing the tightening torque up to T = 25 N m for all values of W/ D. However, the other stages of failure were slightly affected by the value of T. The results obtained from the analysis of variance identified that there is no clear effect of W/ D and e/ D on the sticking failure load. However, their effects are markedly clear for other stages of failure.

Failure Response of Two Serial Bolted Joints in Composite Laminates

2011 ◽  
Vol 27 (3) ◽  
pp. 293-307 ◽  
Author(s):  
F. Sen ◽  
O. Sayman
Keyword(s):  
Composite Laminates ◽  
Glass Fibers ◽  
Diameter Ratio ◽  
Hole Diameter ◽  
Bolted Joints ◽  
Geometrical Parameters ◽  
Material Parameters ◽  
Joint Geometry ◽  
Parametric Studies ◽  
Plate Width

ABSTRACTIn this study, the failure response of two serial bolted joints in composite laminates was investigated. The composite material was consisted of epoxy matrix and glass fibers. To find out the effects of joint geometry and stacking sequences on the failure response, parametric studies were performed experimentally. Three different geometrical parameters that were the edge distance-to-hole diameter ratio (E/D), plate width-to-hole diameter ratio (W/D) and the distance between two serial holes-to-hole diameter ratio (K/D) were investigated. Hence, E/D, W/D and K/D ratios were considered from 1 to 5, 2 to 5 and 3 to 5, respectively. In addition, the failure tests were carried out for a range of preload moments as 2, 3, 4, 5 Nm and without any preload moments as 0Nm. Tested composite laminates were oriented two different stacking sequences as [0°]8 and [0°/0°/90°/90°]s. Experimental results point out that failure response of two serial bolted composite joints are firmly effected from material parameters, geometrical parameters and the magnitudes of applied preload moments.

Representation of bolted joints in a structure using finite element modelling and model updating

2020 ◽  
Vol 14 (3) ◽  
pp. 7141-7151 ◽  
Author(s):  
R. Omar ◽  
M. N. Abdul Rani ◽  
M. A. Yunus
Keyword(s):  
Finite Element ◽  
Dynamic Behaviour ◽  
Model Updating ◽  
Complex Structure ◽  
Bolted Joints ◽  
Model Parameters ◽  
Fe Model ◽  
Bolted Joint ◽  
Fe Modelling ◽  
Joint Structure

Efficient and accurate finite element (FE) modelling of bolted joints is essential for increasing confidence in the investigation of structural vibrations. However, modelling of bolted joints for the investigation is often found to be very challenging. This paper proposes an appropriate FE representation of bolted joints for the prediction of the dynamic behaviour of a bolted joint structure. Two different FE models of the bolted joint structure with two different FE element connectors, which are CBEAM and CBUSH, representing the bolted joints are developed. Modal updating is used to correlate the two FE models with the experimental model. The dynamic behaviour of the two FE models is compared with experimental modal analysis to evaluate and determine the most appropriate FE model of the bolted joint structure. The comparison reveals that the CBUSH element connectors based FE model has a greater capability in representing the bolted joints with 86 percent accuracy and greater efficiency in updating the model parameters. The proposed modelling technique will be useful in the modelling of a complex structure with a large number of bolted joints.

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