Estimation of clamping force in high-tension bolts through ultrasonic velocity measurement

Jhang, Kyung-Young; Quan, Hai-Hua; Ha, Job; Kim, Noh-Yu

doi:10.1016/j.ultras.2006.05.190

Cited by 126 publications

(66 citation statements)

References 2 publications

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“…Due to the effect of the friction between the bolt and the clamped parts and the screw thread, the torque wrench cannot accurately control the pre-tightening force. Acousto-elastic effect based ultrasonic methods are alternatives to estimate the bolt axial load by measuring the time-of-flight (TOF) [2,3], the velocity ratio of longitudinal waves and transverse waves [4,5], and the resonant frequency shift of the bolt [6]. The velocity change of waves in the bolt resulted from the bolt stress is very small, so specialized precision instruments are required to measure the variations of the TOF, velocity and frequency shift, which hinders the application of the method.…”

Section: Introductionmentioning

confidence: 99%

Bolt Looseness Detection Based on Piezoelectric Impedance Frequency Shift

et al. 2016

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Abstract:In this paper, a piezoelectric impedance frequency shift method is developed to estimate the bolt preload for the detection of bolt looseness in engineering structures. An experimental device that allows the precision control of the axial preload force on a bolt is designed and fabricated. A universal testing machine is used to preload accurately on the bolt in the experiments. Under different bolt preload conditions, the impedance analyzer measures the admittance (inverse of the impedance) signal of the PZT (Lead ZirconateTitanate) patches which are bonded on the bolt head. Firstly, a wide frequency band is swept to find a sensitive frequency band of the piezoelectric admittance with the imaginary part. Then in the sensitive frequency band, a specified peak frequency of the admittance signature is chosen to investigate the frequency shift with different bolt preloads. The relationship between the specified frequency shift and the bolt preload is established. The experimental results show that the specified peak frequency decreases as the bolt preload increases for both M16 and M12 bolts, and the frequency shift has a linear relationship with the preload on the bolt. The frequencies of the real and imaginary parts of the admittance signature have the same results. Therefore, the bolt preload can be determined by measuring the specified frequency shift and this method has a good application prospect.

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Section: Introductionmentioning

confidence: 99%

Bolt Looseness Detection Based on Piezoelectric Impedance Frequency Shift

et al. 2016

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“…Some research already exists on methods that do not require the bolt to be measured beforehand. These use the difference between shear and pressure waves to determine the actual stress state in the bolt [Jhang 2006, Kim 2009, Toda 2000, Walaszek 2006]. Some of these use electromagnetic (EMAT) instead of piezoelectric transducers.…”

Section: Methods For Determining Bolt Pretensionmentioning

confidence: 99%

Workshop on quantitative tools for condition assessment of aging infrastructure :

Terry¹,

Siewert²,

McColskey³

et al. 2010

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“…Hirao et al (Hirao, et al, 1994) used non-contacting shear-wave electromagnetic acoustic transducer (EMAT) in the time of flight method and they demonstrated that there is a linear relationship between the flight time and axial force of the structure. Jhang et al (Jhang, et al, 2006) suggested a new method named phase detection method for precise measurements of flight time. They showed that the measurements of velocity fluctuations of the ultrasonic wave in the time of flight method, which is sensitive to the surrounding noises, requires extremely accurate equipment and high expenses; the phase detection method could reduce the costs significantly.…”

Section: Latin American Journal Of Solids and Structures 14 (2017) 21mentioning

confidence: 99%

A Review Paper on Looseness Detection Methods in Bolted Structures

Nikravesh

Goudarzi

2017

Lat. Am. j. solids struct.

101

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Bolted structures are widely utilized in industrial structures and equipment due to the numerous advantages they possess. However, the use of bolts in these structures by itself can cause considerable flaws or damages. One of the major reasons of flaw in such structures is looseness. Since the looseness is initiated with a reduction in the axial force, measurement and estimation of this force can contribute to a healthy performance of the structure. The methods used to measure axial force of bolts are divided into two: those which measure or estimate the force directly and those which, by controlling physical parameters, do this indirectly. Ba-sed on this categorization, this paper examines over 16 methods used for evaluation of axial force of bolted structures, and presents their theoretical bases, drawbacks and advantages, with the litera-ture on each method being discussed separately. Finally, the met-hods are compared and the most important criteria in selecting the methods are introduced.

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Estimation of clamping force in high-tension bolts through ultrasonic velocity measurement

Cited by 126 publications

References 2 publications

Bolt Looseness Detection Based on Piezoelectric Impedance Frequency Shift

Bolt Looseness Detection Based on Piezoelectric Impedance Frequency Shift

Workshop on quantitative tools for condition assessment of aging infrastructure :

A Review Paper on Looseness Detection Methods in Bolted Structures

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