Loosening of threaded fasteners can cause preload decline, induce bolt fatigue fracture, and
severely compromise the reliability of mechanical products. Loosening detection is an …

Pre-stressed bolted joints are widely used in civil structures and industries. The tightening
force of a bolt is crucial to the reliability of the joint connection. Loosening or over-tightening …

In this paper, nonlinear vibrations of fiber-reinforced composite cylindrical shells (FRCCSs)
with bolted joint boundary conditions are studied both theoretically and experimentally …

Looseness detection of bolted connections is an essential industrial issue that can reduce
the maintenance and repair costs caused by joint failures; however, current loosening …

Structural health monitoring (SHM) of bolted joints has played a vital role in estimation of bolt
looseness and prediction of residual service life of bolted connections, thus saving money …

In the past decade, bolt looseness detection has attracted much attention. Compared to
common approaches that require the implementation of constant-contact sensors, several …

Bolted joints are fundamental building blocks and have been widely used to hold multiple
structural components together, while their looseness may lead to costly disasters in …

Bolted connections are prone to losing their preloads with the increasing service life, thus
inducing engineering accidents and economic losses in industries. Therefore, it is important …

With the development of signal processing and deep learning, vision-based methods for
loosening detection have progressed in recent years. However, existing visual inspection …

A multi-frequency ultrasonic method was proposed to detect and characterize delamination
and rich resin in thick composites with waviness. Addressing the challenges for ultrasonic …