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1. Different measurement methods
There has been a strong need for non-destructive evaluation of tightening tension in screwed assemblies, with the aim of improving control of assembly processes and guaranteeing reliability. Indeed, even an assembly optimized with regard to the dimensioning of its fasteners will have a mediocre performance if the tightening tension control operation has been poorly carried out.
Portable or transportable instruments have been developed to meet these needs, and are now commercially available. They provide information (torque, tension, elongation, angle) on the quality of tightening achieved on an assembly.
There are various methods for checking tightness.
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Torque measurements
The most widespread methods are those based on torque measurement. Even if the torque measurement...
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Different measurement methods
Principle of the measurement method
Bibliography
Standards and norms
- Fastening elements – Torque/voltage tests – Amendment 1 - NF EN ISO 16047/A1 - 01-13
- Éléments de fixation. Assemblages vissés. Conception, calcul et conditions de montage - FD E 25-030 - 08-84
- Articles de boulonnerie d'usage général. Spécifications techniques. Réception. Commande. Livraison - NF E 27-005 - 10-69
- Éléments de fixation. Essais de fatigue sous charge axiale - NF E 27-009 - 10-69 ...
Patents
US8037772B2. Thread forming fasteners for ultrasonic load measurement and control.
EP787980B1. Measuring a load on a part and monitoring the integrity of the part | Belastungsmessung eines Elementes und Überwachung seiner Integrität | Mesure de la charge dans une pièce et surveillance de l'intégrité de cette pièce.
US5301574A. Hydraulic wrench and piston has rack gear meshed with...
Directory
Manufacturers – Suppliers – Distributors (non-exhaustive list)
• The SKF Group's technical guide to clamping
http://www.skf.com/binary/12-126662/Serrage- hydraulique_10061_FR.pdf
• ULTR A-RS website
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