Dr. Japheth Obiko

Designation: Tutorial Fellow

Areas of Research
Material and Metallugry

Computational Methods (FEM)

Manufacturing processes (WAAM)

Welding Metallurgy

Machining (Hard to machne alloys)

Composites  

Published Book Chapters

  1. J. Obiko, F. Mwema (2021) “Stress and strain distribution in the upsetting process: Numerical simulation,” Handbook of Recent Developments in Manufacturing, Materials, and Mechanical Engineering, DOI: 10.4018/978-1-7998-4939-1.ch013, Publisher: IGI Global eEditorial Discovery.
  2. Obiko et al (2021) “Surface engineering of materials through weld-based technologies: An overview”, Advanced surface coating techniques for modern industrial applications,DOI: 10.4018/978-1-7998-4870-7.ch011, Publisher: IGI Global eEditorial Discovery

Published Journal Articles

  1. Cleophas Obara, F.M. Mwema, James N. Keraita, Harrison Shagwira and J. Obiko “A multi-response optimisation of the MDF process for Aluminium 7075 alloy using grey-based Taguchi method” SN Appl. Sci., vol. 3, p.596, 2021. doi.org/10.1007/s42452-021-04527-2
  2. M. Muigai, F. M. Mwema, E. Akinlabi, J. Obiko “Influence of direct current (DC) on mild steel coating using stainless steel rods via TIG welding: A model for rehabilitation of steel components” IOP Conf. Ser. Mater. Sci. Eng, vol. 1107 p. 012039, 2021. doi:10.1088/1757-899X/1107/1/012039
  3. J. Obiko, F. Mwema, and M. Bodunrin “Validation and Optimization of cutting parameters for Ti-6Al-4V turning operation using DEFORM 3D simulations and Taguchi method” Manufacturing Rev. 8,5 (2021).
  4. Japheth Obiko “Friction correction of flow stress-strain curve in the upsetting process” IOPSciNotes 2 (2021)014401, doi.org/10.1088/2633-1357/abdd96
  5. Obiko et al. “An overview of conventional and non-conventional techniques for machining of titanium alloys” Manufacturing Rev. Vol 7, No.34 (2020). doi.org/10.1051/mfreview/2020029
  6. J. Obiko, F. Mwema “Deformation behaviour of high-strength aluminium alloy during forging process using Finite element method” Eng. Solid Mech., Vol 9 pp. 31-45, 2021, doi: 10.5267/j.esm.2020.6.001.
  7. J. Obiko, F. Mwema “Numerical simulation on the effect of sample geometry size on the metal flow behaviour during the forging process” IOP SciNotes. IOP Publishing, 1(1), p. 014401. doi: 10.1088/2633-1357/ab828c.
  8. J. Obiko, F. Mwema, H. Shangwira “Forging optimisation process using numerical simulation and Taguchi method” SN Applied Sciences, vol 2, pp. 713-721, 2020. doi.org/10.1007/s42452-020-2547-0.
  9. J. Obiko, L. Chown and D. Whitefield “Warm deformation behaviour of P92 steel” Material Research Express, vol 6, 1265j7, 2019. doi.org/10.1088/2053-1591/ab5e9c.
  10. J. Obiko, L. Chown, and D. Whitefield, “Microstructure characterisation and microhardness of P92 steel heat treated at the transformation temperatures,” IOP Conf. Ser. Mater. Sci. Eng., vol. 655, p. 012014, 2019. doi: 10.1088/1757-899X/655/1/012014
  11. J. Obiko, F. Mwema, and M. Bodunrin, “Finite element simulation of X20CrMoV121 steel billet forging process using the Deform 3D software,” SN Appl. Sci., vol. 1, no. 9, p. 1044, 2019.
  12. F. Mwema, T. Mbuya, E. T. Akinlabi, P. Reed, and J. Obiko, “Data on the effect of high-pressure torsion processing on secondary cast Al–10%Si– Cu piston alloy: Methods, microstructure and mechanical characterizations,” Data Br., vol. 25, p. 104160, 2019.
  13. J. Obiko, F. Mwema, and E. Akinlabi, “Strain rate-strain/stress relationship during isothermal forging: A Deform-3D FEM,” Eng. Solid Mech., vol. 8, pp. 1–6, 2019.
  14. F. Mwema, J. Obiko, T. Leso, T. Mbuya, B. Mose, and E. Akinlabi, “Wear Characteristics of Recycled Cast Al-6Si-3Cu Alloys,” Tribol. Ind., vol. 41, no. 4, pp. 613–621, 2019.
  15. J. Obiko, F. Mwema “Finite element modelling of non-constrained closed die forging (modified upsetting) using DEFORM 3D TMInt. J.  Sci. and Tech. Res., vol 9, no. 1, pp 642-647, 2020
  16. F.M. Mwema, J.O. Obiko, E.T Akinlabi, S.A. Akinlabi and O. S. Fatoba. “Effect of punch force on the upsetting deformation process using three- dimensional finite element analysis” Journal of Physics: Conference Series 1378(2019) 032094, doi:10.1088/1742-6596/1378/3/032094
  17. F. Mwema, K. Mathew, S. Harrison, and O. Japheth, “Design Optimization of Angular Extrusion for Severe Plastic Deformation of Tubular Specimens,” Int. J. Mech. Appl., vol. 7, no. 1, pp. 1–13, 2017.

Conferences Articles
1. Short Fatigue Crack Growth Behaviour of a Cast Al-Si-Cu-Ni piston alloy The 8th International Conference of the Africa Materials Research Society December 7-10,2015 Accra, Ghana.

2. Effect of Minor Elements on the Crack Initiation and S-N Performance of a Cast Al-Si-Cu-Ni-Fe piston alloy The 8th International Conference of the Africa Materials Research Society December 7-10,2015 Accra, Ghana.


Contacts
Office: COHES 3rd Flr, right wing
Phone: (067)52711, 52181 Ext. 2376
Email: jobiko@jkuat.ac.ke