A Comparison of Contact Stiffness Measurements Obtained by the Digital Image Correlation and Ultrasound Techniques

Mulvihill, Daniel M.; Brunskill, Henry; Kartal, Mehmet E.; Dwyer-Joyce, R. S.; Nowell, D.

doi:10.1007/s11340-013-9718-5

Cited by 40 publications

(28 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…More complicated is the case of the ultrasound transmission through sliding contacts [21,25,[41][42][43][44][45][46], with the pioneering work of Kendall and Tabor [25] being one of the most significant. They used a pin on disc rig under steady sliding and a longitudinal ultrasonic transducer.…”

Section: Ultrasounds and Contactmentioning

confidence: 99%

“…Accurate and non-contacting measurements are possible through laser measurements (see e.g. some of the friction rigs for hysteresis loop measurements [14][15][16][17]) or by using digital image correlation (DIC) [18][19][20][21]. In a recent study [18], the authors have used DIC to monitor the local contact interface of a frictional damper.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

On the Use of Ultrasound Waves to Monitor the Local Dynamics of Friction Joints

et al. 2019

View full text Add to dashboard Cite

Friction joints are one of the fundamental means used for the assembly of structural components in engineering applications. The structural dynamics of these components becomes nonlinear, due to the nonlinear nature of the forces arising at the contact interface characterised by stick-slip phenomena and separation. Advanced numerical models have been proposed in the last decades which have shown some promising capabilities in capturing these local nonlinearities. However, despite the research efforts in producing more advanced models over the years, a lack of validation experiments made it difficult to have fully validated models. For this reason, experimental techniques which can provide insights into the local dynamics of joints can be of great interest for the refinement of such models and for the optimisation of the joint design and local wear predictions. In this paper, a preliminary study is presented where ultrasound waves are used to characterise the local dynamics of friction contacts by observing changes of the ultrasound reflection/transmission at the friction interface. The experimental technique is applied to a dynamic friction rig, where two steel specimens are rubbed against each other under a harmonic tangential excitation. Initial results show that, with a controlled experimental test procedure, this technique can identify microslip effects at the contact interface.

show abstract

Section: Ultrasounds and Contactmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the Use of Ultrasound Waves to Monitor the Local Dynamics of Friction Joints

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Each captured image is compared to the reference image (i.e., the unloaded first image), and displacements for each subset between the current and reference image are calculated within sub-pixel accuracy. The theory and concepts of DIC are comprehensively described in Sutton et al 13 DIC has been applied in fretting experiments to determine frictional properties, such as, hysteresis loops and contact stiffness [14][15][16][17][18] and to measure tangential displacements (relative slip). [19][20][21] DIC has been combined with FEM to calibrate friction coefficient.…”

Section: Introductionmentioning

confidence: 99%

A comparison of relative displacement fields between numerical predictions and experimental results in fretting contact

Juoksukangas

Lehtovaara

Mäntylä

2016

Proceedings of the Institution of Mechanical Engineers, Part J:

View full text Add to dashboard Cite

In this paper, a comparison is made between calculated and measured displacements from a complete contact fretting test device. An experimental technique based on digital image correlation was used to measure the local displacement field at the contact interface. The material of the fretting specimen and pads was quenched and tempered steel. The effect of test device compliances and rigid body movement was minimized by measuring displacements very close to the contact interface. The measured displacements were successfully compared to the computed displacements of a corresponding finite element model. The relative slip amplitude in partial slip conditions, slip distribution across the contact, length of the slip region, and accumulated slip distribution, were compared. Relative slip decreases markedly with increasing normal load and friction coefficient. The friction coefficient was calibrated and determined as a function of loading cycles of fretting fatigue tests with two normal loads. The friction coefficient was found to increase at the beginning of tests and stabilize after about 1000 cycles, which is in agreement with general observations.

show abstract

“…One is the experimental approach, where the stiffness can be identified utilizing novel techniques such as ultrasonic assessment [8], digital image correlation [9], modal analysis [10] and virtual fields method [11]. The other approach is to build the theoretical contact model and derive the contact stiffness further.…”

Section: Introductionmentioning

confidence: 99%