Metal to composite bolted joint behavior evaluated at impact rates of loading

2013 ◽  
Vol 106 ◽  
pp. 446-452 ◽  
Author(s):  
Andy VanderKlok ◽  
Abhishek Dutta ◽  
Srinivasan Arjun Tekalur
Keyword(s):  
Bolted Joint ◽  
Joint Behavior

Influence of Head Geometry on Bolted Joint Behavior

2002 ◽  
Vol 15 (4) ◽  
pp. 136-153 ◽  
Author(s):  
John D. Pratt ◽  
Gerard Pardoen
Keyword(s):  
Bolted Joint ◽  
Joint Behavior

Recovery of Preload in Bolted Joint Using Shape Memory Alloy Elements

2003 ◽  
Author(s):  
Mehrdaad Ghorashi ◽  
Daniel J. Inman
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Threshold Level ◽  
Design Stage ◽  
Strain Gauges ◽  
Self Healing ◽  
Bolted Joint ◽  
Cross Sectional ◽  
Bolt Preload ◽  
Joint Behavior

One of the main problems with a bolted joint is losing its preload. In this situation, it cannot provide the required clamping force needed to keep the joint members together or prevent fluid leakages. Although every effort is usually made at the design stage to prevent such failure, because of the numerous factors present in the problem, these efforts are not always successful. After loosening occurs, the joint should be retightened to regain its preload. However, there are circumstances where the joint is very important but it is not easily accessible and retightening cannot be done manually. The shape memory effect (SME) property can be used in such circumstances to produce the necessary preload. The shape memory alloy (SMA) element should be activated if monitoring the bolt preload through the application of strain gauges shows that the preload has fallen below a pre-determined threshold level. This paper presents a mathematical model for the SMA element and the whole joint behavior. The relation between SMA activation (corresponding to the amount of phase change in the SMA) and the resulting preload is estimated. To this end, it is assumed that the SMA element behaves in such a way that either its cross-sectional area or its volume remain constant. The analysis of this model shows the feasibility of the application of SMA for producing the required preload. Hence, if used properly, the required preload is achieved and a self-healing joint is obtained.

Effect of Underhead Design Configuration on Bolt Behavior Under Shear Loads

2015 ◽  
Author(s):  
Zhijun Wu ◽  
Sayed A. Nassar
Keyword(s):  
Finite Element ◽  
Mechanical Behavior ◽  
Transverse Shear ◽  
Shear Load ◽  
Bolted Joint ◽  
Shear Loads ◽  
Element Simulation ◽  
Bolt Preload ◽  
Bolted Flange ◽  
Joint Behavior

This study uses nonlinear 3-D finite element simulation to investigate the effect of bolt underhead design on its mechanical behavior under cyclic transverse shear loads. The effect of bolt underhead fillet radius and / or under-cut on bolt deformation as well as bolted joint behavior is studied in order to optimize the bolted flange performance under externally applied loads. Two levels of bolt preload and two transverse shear load cycles are studied. Bolt tensile and bending stiffnesses for various underhead designs are also evaluated and discussed.

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.

scholarly journals Experimental study of lateral resistance of bolted joints using Japanese cedar (Cryptomeria japonica) treated with resin impregnation

2020 ◽  
Vol 66 (1) ◽  
Author(s):  
Keita Ogawa ◽  
Satoshi Fukuta ◽  
Kenji Kobayashi
Keyword(s):  
Short Pulse ◽  
Japanese Cedar ◽  
Bolted Joints ◽  
Bolted Joint ◽  
Yield Load ◽  
Short Pulse Laser ◽  
Resin Impregnation ◽  
Lateral Resistance ◽  
Ultraviolet Wavelength ◽  
Resistance Performance

Abstract The development of wooden joints possessing high resistance performance has become an important issue for the construction of newer buildings. This study attempts to strengthen the lateral resistance of bolted joints using the previously reported plasticizing technique. This technique consists of two processing stages: incising the surface of the wood using an ultraviolet wavelength short-pulse laser and impregnating the resin into the incised area. This technique makes it possible to plasticize only a local part of the wood surface. Bolted joint specimens were assembled using plasticized wood around the bolt hole, and the lateral tests were conducted. Acrylic monomer and urethane prepolymer were used as the impregnating resins and their incision depths were set as 4 and 10 mm. When the lateral load acted parallel to the grain, changes in the lateral resistance characteristics were observed, especially for the stiffness and yield load. For example, when acryl was used, and the incision depth was 10 mm, an increment of 73% in the yield load was observed, as compared to the non-impregnated specimens. The specimen groups impregnated with acryl exhibited greater changes in their properties than those using urethane. When loaded perpendicular to the grain, an increase in properties were observed; however, these increments were lower than those of the groups loaded parallel to the grain.

Sign in / Sign up

Export Citation Format

Share Document