Monitoring of L-Shape Bolted Joint Tightness Using Thermal Contact Resistance

Distributed Force Measurement and Mapping Using Pressure-Sensitive Film and Image Processing for Active and Passive Aligners on Orthodontic Attachments

“…The Fujifilm Prescale® products have been widely used in occlusion, bite force recording, temporomandibular joints, and orthodontics [9]- [12]. Jalalpour et al [13] concluded that the contact pressure could be measured by the thermal contact resistance, whereby a high torque produces a dark stain concentration. Barbagallo et al proposed a similar pressure film approach to measure the force on removable thermoplastic appliances (RTA) [14] using Pressurex® film.…”

Experimental investigation on ball plate contact using ultrasonic reflectometry: From static to dynamic

“…For contact condition monitoring, it is desirable to seek approaches that are not only non-destructive, but also non-invasive. There are also some other options to monitor the contact patch by using thermal imaging [21] or computer vision [22], but neither thermal device nor cameras can penetrate into the actual contact regions. In summary, when it comes to real-time dynamic contact characterisation, existing monitoring techniques are hindered by the trade-off between access to contact regions and non-invasive design, making the task challenging.…”

Fault diagnosis of bolt loosening in structures with a novel second-order output spectrum–based method

“…The reduction of preload due to bolt loosening could also affect the state of interface of bolted joints, and then decrease the contact pressure. 6 Jalalpour et al 7 demonstrated that thermal contact resistance can be developed and correlated to the contact pressure of bolted joints. Probability analysis showed that the probability density functions (PDFs) of thermal contact resistance decrease with the rise of average contact pressure.…”