Application of digital image correlation to the investigation of crack closure following overloads by Nowell, D, de Matos, P

Plasticity-induced fatigue crack closure: an investigation using digital image correlation by O'Connor, S

“…<p>The present work demonstrates the practical application of digital image correlation (DIC) in measuring near tip displacement fields of fatigue cracks in 6082 T6 aluminium alloy. …”

Determination of the Frictional Properties of Titanium and Nickel Alloys Using the Digital Image Correlation Method by Kartal, M, Mulvihill, D, Nowell, D, Hills, D

“…Slip displacement between the specimen and pad was measured remotely using an LVDT and locally using digital image correlation. The latter approach allowed accurate determination of the tangential contact stiffness from frictional hysteresis loops. …”

A Comparison of Contact Stiffness Measurements Obtained by the Digital Image Correlation and Ultrasound Techniques by Mulvihill, D, Brunskill, H, Kartal, M, Dwyer-Joyce, R, Nowell, D

“…The digital image correlation (DIC) and ultrasound techniques have both previously been employed to measure the contact stiffness of real engineering interfaces, but a comprehensive comparison of these techniques has not previously been carried out. …”

Optical methods for measurement of fatigue crack closure: moire interferometry and digital image correlation by Nowell, D, Paynter, R, De Matos, P

“…Finally, more recent measurements using digital image correlation are reported. Results from all three techniques are compared and the advantages and disadvantages of each approach are discussed. © 2010 Blackwell Publishing Ltd.…”

Measurements of pressure and area dependent tangential contact stiffness between rough surfaces using digital image correlation by Kartal, M, Mulvihill, D, Nowell, D, Hills, D

“…The present paper describes an experimental technique to accurately measure the tangential contact stiffness between two rough contacting surfaces manufactured from the titanium alloy Ti6Al4V. The digital image correlation method is employed to measure the local displacement field. …”

Digital image correlation measurement of near-tip fatigue crack displacement fields: constant amplitude loading and load history effects by Nowell, D, Kartal, M, De Matos, P

Investigation of fatigue crack models by micro-scale measurement of crack tip deformation by Nowell, D, Dragnevski, K, O'Connor, S

“…The paper describes displacement measurements taken in the vicinity of a fatigue crack tip using digital image correlation. In-situ loading is employed in a scanning electron microscope to get measurements very close to the tip. …”

Measurement and analysis of fatigue crack deformation at the micro-scale by Nowell, D, Dragnevski, K, O’Connor, S

“…This paper introduces the use of digital image correlation for the measurement of surface displacements in the neighbourhood of a crack tip, both at the macro- and micro- scale. …”

Measurement of fatigue crack deformation on the macro- and micro-scale: uniform and non-uniform loading by Nowell, D, O'Connor, S, Dragnevski, K

“…The specimen is pre-cracked conventionally, but then loaded in-situ in a scanning electron microscope. Digital image correlation is applied to the images collected and is analysed using an elastic model to produce stress intensity factor histories. …”

Crack tip deformation fields and fatigue crack growth rates in Ti-6Al-4V by Korsunsky, A, Song, X, Belnoue, J, Jun, T, Hofmann, F, De Matos, P, Nowell, D, Dini, D, Aparicio-Blanco, O, Walsh, M

“…Crack opening was measured during cycling using digital image correlation, and residual stress intensity factor was determined using synchrotron X-ray diffraction mapping. …”

Crack tip deformation fields and fatigue crack growth rates in Ti-6Al-4V by Korsunsky, A, Song, X, Belnoue, J, Jun, T, Hofmann, F, De Matos, P, Nowell, D, Dini, D, Aparicio-Blanco, O, Walsh, M

“…Crack opening was measured during cycling using digital image correlation, and residual stress intensity factor was determined using synchrotron X-ray diffraction mapping. …”

The effect of surface damage and residual stresses on the fatigue life of nickel superalloys at high temperature by Fleury, R, Salvati, E, Nowell, D, Korsunsky, A, Silva, F, Tai, Y

“…The residual stress distribution underneath the dent root obtained numerically was compared with the measurements on experimentally simulated damaged specimens using ring-core milling at the micron scale through a combined Focused-Ion Beam and Digital Image Correlation technique (FIB-DIC). The numerical and experimental results for the residual stress show good agreement in terms of residual stress trends and magnitudes. …”

Measurement of tangential contact stiffness in frictional contacts: the effect of normal pressure by Kartal, M, Mulvihill, D, Nowell, D, Hills, D

“…In order to measure the local displacement field very close to the contact interface, the digital image correlation (DIC) method is employed. The effect of normal contact pressure on tangential contact stiffness is investigated. …”

A study of overload effect on fatigue crack propagation using EBSD, FIB-DIC and FEM methods by Salvati, E, O’Connor, S, Sui, T, Nowell, D, Korsunsky, A

“…Residual stress was evaluated at salient locations around the crack retardation site using the FIB-DIC method which combines the use of Focused Ion Beam (FIB) and Digital Image Correlation (DIC) for residual stress measurement at the (sub)micron-scale. …”

Studies of frictional interface behaviour: experiments and modelling by Mulvihill, DM

“…Experiments are performed where contact stiffness is measured simultaneously by both ultrasound and digital image correlation. The effect of normal and tangential loading upon the contact stiffness (normal and tangential) is investigated. …”