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1. WO2020108721 - BOLT TENSION MEASURING DEVICE AND METHOD

Publication Number WO/2020/108721
Publication Date 04.06.2020
International Application No. PCT/DK2019/050411
International Filing Date 18.12.2019
IPC
G01L 5/24 2006.01
GPHYSICS
01MEASURING; TESTING
LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
5Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
24for determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed
CPC
G01L 5/24
GPHYSICS
01MEASURING; TESTING
LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
5Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
24for determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed
Applicants
  • R&D ENGINEERING A/S [DK]/[DK]
Inventors
  • NIELSEN, Flemming Selmer
Agents
  • CHAS. HUDE A/S
Priority Data
PA 2018 7082218.12.2018DK
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) BOLT TENSION MEASURING DEVICE AND METHOD
(FR) DISPOSITIF ET PROCÉDÉ DE MESURE DE TENSION DE BOULON
Abstract
(EN)
The invention relates to a device and method for determining the elongation (E) of a preloaded bolt (1) in a bolted joint. The method comprises the steps of: ultra- sonically measuring (110) the time-of-flight of an ultrasonic wave through the pre- loaded bolt (1) to determine an ultrasonic bolt length (C); reference measuring (120) a mechanical length (B) of said preloaded bolt (1) using a technique that is different from ultrasonic measurement; determining a difference between said lengths obtained by said two measurements, and determining the elongation (E) of said loaded bolt (1) compared to a corresponding unloaded bolt based on said difference in length and on a predetermined material constant (Km) of the bolt. Thereby, it is possible to calculate the elongation and tension of a preloaded bolt (1) without unloading it.
(FR)
L'invention concerne un dispositif et un procédé de détermination de l'élongation (E) d'un boulon préchargé (1) dans un joint boulonné. Le procédé comprend les étapes consistant à : mesurer de manière ultra-sonique (110) le temps de vol d'une onde ultrasonore à travers le boulon préchargé (1) pour déterminer une longueur de boulon ultrasonore (C); mesurer par référence (120) une longueur mécanique (B) dudit boulon préchargé (1) à l'aide d'une technique qui est différente de la mesure ultrasonore; déterminer une différence entre lesdites longueurs obtenues par lesdites deux mesures, et déterminer l'allongement (E) dudit boulon chargé (1) par rapport à un boulon non chargé correspondant sur la base de ladite différence de longueur et d'une constante de matériau prédéterminée (K m) du boulon. Ainsi, il est possible de calculer l'allongement et la tension d'un boulon préchargé (1) sans le décharger.
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