Ultrasonic testing is taking off and special techniques are needed to ensure that maximum advantage is being made of fastener material and loadings.
Ultrasonic technology to measure load in critical fasteners is accelerating through a period of rapid development based on miniaturization and new software. Composite development and special new fastener designs with rapid tightening machines have spurred interest in the accurate measurement of load and the consequent saving in weight, reliability and cost. Engineers need to know the lo ad in a bolt as part of the design, a testing program, or as an investigation into why fasteners are loosening. This can be critical in complex assemblies and fatigue analysis. Detailed studies of bolted connections in laminated composite structures have been made using the latest developments in ultrasonic measurement technology.
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