Strain measurement by three-dimensional electronic speckle pattern interferometry: potentials, limitations, and applications

Ettemeyer, Andreas

doi:10.1117/1.1566781

Cited by 80 publications

(8 citation statements)

References 12 publications

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“…Electronic speckle pattern interferometry (ESPI) technique monitors the strain field in the joint assembly around the bolt ( Figure 5) establishing a reliable correlation with the load (Nassar and Meng, 2007;Yang and Ettemayer, 2003). Because deformation of parts of assembly is independent of the friction factor, the direct monitoring of deformation and strain field caused by the load would provide a more reliable indication method of the preload as compared to the conventional torque control method.…”

Section: Optical Methodsmentioning

confidence: 99%

Nondestructive Bolt Preload Measurement

Horváth¹,

Tóth²

2018

AJTE

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Bolts are very important elements of machines and structures. The usual torque wrench technique guarantees only the torque applied, but the real axial load remains unknown because of friction among bolt threads and between the bolt head and the washer. To make the situation more difficult, the parts of structures prevent direct measurement of axial load, consequently threaded fasteners are usually over-sized for safety reasons. The known nondestructive ultrasonic and electromagnetic acoustic resonance methods have many error factors. This paper proposes a new nondestructive measuring method that relies on bolt head face deformation due to axial load. In this paper the deflection of a M12 bolt head is studied by means of FEA method as well as surface profile and Eddy-current measurements. Results of all methods agreed well, proving that bolt head deformation can be applied in practice as an indication means of bolt load.

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Section: Optical Methodsmentioning

confidence: 99%

Nondestructive Bolt Preload Measurement

Horváth¹,

Tóth²

2018

AJTE

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“…Удобные и эффективные методы регистрации фазы оптического излучения могут быть основаны на подходе фазомодуляционной спекл-интерферометрии, извевстном как ESPI (Electronic Speckle Pattern Interferometry) [9][10][11]. Этот подход близок к методам цифровой голографии, но проще, обладает большей универсальностью и легко модифицируется применительно к конкретным характеристикам исследуемых объектов [9].…”

Section: анализ литературных данных и постановка проблемыunclassified

“…Этот подход близок к методам цифровой голографии, но проще, обладает большей универсальностью и легко модифицируется применительно к конкретным характеристикам исследуемых объектов [9]. Важным его преимуществом является то, что максимальный размер объекта лимитируется только длиной когерентности используемого лазера, в реальности размеры могут варьироваться от микрона до нескольких метров [9,10]. Высокая чувствительность к фазе оптического излучения делает его исключительно полезным при исследовании формы и движения прозрачных биообъектов in vivo [11].…”

Section: анализ литературных данных и постановка проблемыunclassified

Application of the interferometric approach for the optical tomography of stationary torch

Попов¹,

Тюрин²,

Ткаченко³

et al. 2015

EEJET

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Кандидат физико-математических наук, старший научный сотрудник, заведующий лабораторией Лаборатория проблем прикладной физики и компьютерных технологий* А. В. Т ю р и н Доктор физико-математических наук, профессор, заведующий кафедрой**

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“…New approaches using shape memory alloy (SMA) [12] to [13] or electronic speckle pattern interferometry (ESPI) technique [14] have been applied to the monitoring of the preload. However, the former is costly and the latter demands very stringent environmental stability and hence cannot be employed in a manufacturing environment [15]. Optical digital imaging correlation (DIC) method [16] was proposed to measure compressive strain in a washer, and the bolt preload is subsequently determined from the measured strain.…”

Section: Introductionmentioning

confidence: 99%

An Improved Torque Method for Preload Control in Precision Assembly of Miniature Bolt Joints

Zhang¹,

Wang²,

Luo³

2012

SV-JME

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In this work, the improved torque method based on a mathematical model is proposed for preload control in the precision assembly of miniature bolt joints. The mathematical model was used for predicting the friction-compensated control torque. The predicted control torque is a function of preload and torque gradient which is determined by the friction of contact surfaces. Thus, the effect of friction on preload error was reduced, and the bolts preload scatter due to frictional variables of the bolts was decreased. Experiments were carried out to verify the proposed method using the bolts with a thread of M1.6, and the results show that the scatters of preload were less than ±13.0% in the elastic range, which is more consistent than the conventional torque method. The preload control error for most bolts was less than 10%.

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Strain measurement by three-dimensional electronic speckle pattern interferometry: potentials, limitations, and applications

Cited by 80 publications

References 12 publications

Nondestructive Bolt Preload Measurement

Nondestructive Bolt Preload Measurement

Application of the interferometric approach for the optical tomography of stationary torch

An Improved Torque Method for Preload Control in Precision Assembly of Miniature Bolt Joints

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