28 citations · 67 across the 9 of their papers we have counts for
9 papers
Direct current thermo-mechanical testing: Principles, uncertainty hierarchy, and its role in advanced materials characterisation
Abdalrhaman Koko, Sodiq Abiodun Kareem, Olajesu Favor Olanrewaju +4
Direct current thermo-mechanical testing (DC-TMT), based on resistive Joule heating, enables rapid heating and cooling, steep thermal gradients and simultaneous mechanical loading,…
On the configurational force associated with blocked slip bands at grain boundaries in α-Ti
Abdalrhaman Koko
Grain boundaries can block slip-band propagation and generate intense local stress and strain fields that influence subsequent deformation and damage initiation in polycrystalline…
In situ elucidation of mechanisms governing crack transition to plasticity arrest
Abdalrhaman Koko, Bemin Sheen, Caitlin Green +1
Despite extensive theoretical treatment of short- to long-crack transitions, direct experimental quantification of how elastic and plastic energy contributions evolve at the crack…
DIC2Abaqus: Calculating mixed-mode stress intensity factors from 2D and 3D-stereo displacement fields
Abdalrhaman Koko, T. James Marrow
Integrating experimental data into simulations is crucial for predicting material behaviour, especially in fracture mechanics. Digital Image Correlation (DIC) provides precise disp…
Estimation of fatigue life of TiN coatings using cyclic micro-impact testing
Abdalrhaman Koko, Elsiddig Elmukashf, Tony Fry +2
This paper studies the behaviour of a thin titanium nitride (TiN) coating (1.5 um thick) on a tool steel substrate material under dynamic and cyclic impacts through an approach com…
In situ characterisation of slip bands behaviour in ferrite under mechanical loading
Abdalrhaman Koko
This study investigates the behaviour of slip bands, terminated mid-grain in the ferrite grains of age-hardened stainless steel, under different conditions to understand their disl…
HR-EBSD analysis of in situ stable crack growth at the micron scale
Abdalrhaman Koko, Thorsten H. Becker, Elsiddig Elmukashfi +3
Understanding the local fracture resistance of microstructural features. such as brittle inclusions, coatings, and interfaces at the microscale under complex loading conditions is…
An iterative method for reference pattern selection in high resolution electron backscatter diffraction (HR-EBSD)
Abdalrhaman Koko, Vivian Tong, Angus J. Wilkinson +1
For high (angular) resolution electron backscatter diffraction (HR-EBSD), the selection of a reference diffraction pattern (EBSP0) significantly affects the precision of the calcul…
A Computational Method for the Determination of the Elastic Displacement Field using Measured Elastic Deformation Field
Abdalrhaman Koko, James Marrow, Elsiddig Elmukashfi
A novel approach was derived to compute the elastic displacement field from a measured elastic deformation field (i.e., deformation gradient or strain). The method is based on inte…