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Dr Amos M Muiruri

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Category: School of Engineering and Technology

Dr Amos M Muiruri modifiedLecturer and Chairperson
Department of Mechanical and Manufacturing Engineering
Primary Discipline: Mechanical Engineering; Solid and Structural Mechanics; Material Science and Engineering; Numerical Modelling and Simulation; Fracture Mechanics; Additive manufacturing.

Degrees Degrees Awarded: [Note: List highest degree awarded first]

  1. Doctor of Engineering in Mechanical Engineering (D.Eng. Mech.Eng.)- Central University of Technology, Freestate South Africa - 2021
  2. Master of Engineering in Mechanical Engineering (M. Eng. Mech. Eng.) – cum laude - Central University of Technology, Freestate South Africa – 2019
  3. Bachelor of Engineering in Mechanical Engineering (B.Eng.Mech. Eng.)- first class of honors. Technical University of Kenya – 2015.

Other Credentials/Recognitions & Awards Other Specialized Training

  1. Trained on Water Purification and De-centralized Solutions- German Water Partnership (GWP) in cooperation with Kenya Water Institute (KEWI).

Current Professional/Scientific Interests, Memberships, and Activities:

Registrated as a Graduated Mechanical Engineer: No. B18667 - Engineers Board of Kenya (EBK).

Research, Scholarly, Professional and Scientific Activities

Presented Conference Papers

  1. A. M. Muiruri, M. Maringa, W. B. du. Preez, L. M. Masu, “Dynamic behaviour of direct metal laser sintered Ti-6Al-4V (ELI) under high strain rates in compression loading”, Rapdasa International Conference Proceedings Durban, South Africa, pp.165-180: ISBN: 978-0-620-77329-4.
  2. A. M. Muiruri, M Maringa, W B du Preez & LM Masu, “Effect of Stress Relieving Heat Treatment on High Strain Rate Tensile Properties of Direct Melting Laser Sintered (DMLS) Parts”, 7th International Conference on Competitive Manufacturing (COMA-19), January 30 - February 1, 2019, Wallenberg Centre (STIAS), Stellenbosch, South Africa. ISBN No: 978-0-7972-1779-9.
  3. A. M. Muiruri, M Maringa & W B du Preez, “Constitutive Numerical Modelling in Additive Manufacturing: Challenges in Predicting the Yield Strength and Flow Properties of Alloys”, Rapdasa International Conference Proceedings, 06 – 08 November 2019, Emoya Estate, Bloemfontein, South Africa, pp. 190-203. ISBN 978-0-6398390-0-4.
  4. A.M. Muiruri, M. Maringa & W.B.du, Preez, “Application of Phenomenological Modelling in the Development of a Database for Additively Manufactured Ti6Al4V (ELI): A Review” 10th International Conference of the African Materials Research Society (AMRS2019), 10 – 13 December 2019 Arusha, Tanzania.
  5. Amos Muiruri; Maina Maringa; Willie du Preez. ‘Theoritical model of the flow properties of post processed direct metal laser sintering Ti6Al4V’ 6th World Congress on Integrated Computational Materials Engineering (ICME 2022): On-Demand Oral Presentations, Hyatt Regebcy Lake Tahoe, Nevada, USA, April 24- 25, 2022 http://www.programmaster.org/PM/PM.nsf/ViewSessionSheets?OpenAgent&ParentUNID=75AB275E59AC7CE9852587C100531136

Published Journal papers

  1. A M Muiruri, M Maringa, W B du Preez, L M Masu, “ Variation of impact toughness of as-built DMLS Ti6Al4V (ELI) specimens with temperature”, South African Journal of Industrial Engineering, November 2018 Vol 29(3) special edition, pp 284-298. ISSN 224-7890.
  2. A M Muiruri, M Maringa, W B du Preez & LM Masu, “Effects of Stress-Relieving Heat Treatment on Impact Toughness of Direct Metal Laser Sintering (DMLS)-Produced Ti6Al4V (ELI) Parts”, JOM (2019) doi:10.1007/s11837-019-03862-5
  3. Amos Muiruri, Maina Maringa, Wille du Preez and Leonard Masu, “Effect of stress-relieving heat treatment on the high strain rate dynamic compressive properties of Additively Manufactured Ti6Al4V(ELI)”, Metal, 2020, 10(5), 653. doi:org/10.3390/met10050653.
  4. Amos Muiruri, Maina Maringa, Willie du Preez, “Crystallographic texture analysis of as- built and heat-treated Ti6Al4V (ELI) produced by Direct Metal Laser Sintering”, Crystals 2020, 10, 699; doi:10.3390/cryst10080699
  5. Amos Muiruri, Maina Maringa, Willie du Preez, “Evaluation of dislocation densities in various microstructures of additively manufactured Ti6Al4V(ELI) by the method of X-ray diffraction”, Materials 2020, 13, 5355; doi:10.3390/ma13235355
  6. Muiruri, A., Maringa, M., du Preez, W. High strain rate properties of various forms of Ti6Al4V(ELI) produced by direct metal laser sintering. Applied Sciences 2021, 11(17), 8005; doi.org/10.3390/app11178005
  7. Muiruri, A.; Maringa, M.; Preez, W.d. Validation of a Microstructure-Based Model for Predicting the High Strain Rate Flow Properties of Various Forms of Additively Manufactured Ti6Al4V(ELI) Alloy. Metals 2021, 11, 1628. https://doi.org/10.3390/met11101628
  8. Muiruri, A.; Maringa, M.; du Preez, W. Development of VUMAT and VUHARD Subroutines for Simulating the Dynamic Mechanical Properties of Additively Manufactured Parts. Materials 2022, 15, 372. https://doi.org/10.3390/ma15010372
  9. Muiruri, A.; Maringa, M.; Preez, W.d. Numerical Simulation of High Strain Rate and Temperature Properties of Laser Powder Bed Fusion Ti6Al4V(ELI) Determined Using a Split Hopkinson Pressure Bar. Materials 2022, 15, 1872. https://doi.org/10.3390/ma1505187
  10. Muiruri, A.; Maringa, M.; du Preez, W. Statistical Analysis of the Distribution of the Schmid Factor in As-Built and Annealed Parts Produced by Laser Powder BedFusion. Crystals 2022, 12, 743. https://doi.org/10.3390/cryst12050743
  11. Muiruri, A.; Maringa, M.; du Preez, W. Quasi-Static Mechanical Properties of Post-Processed Laser Powder Bed Fusion Ti6Al4V(ELI) Parts under Compressive Loading. Appl. Sci. 2022, 12, 9552. https://doi.org/10.3390/app12199552

Supervision and co-supervision of post graduate students.

Masters students, titles of their dissertations and status

  1. Mr. Ignatius Chibinyani - Topology Optimization of Hierarchical Honeycomb Structures to Reduce Stress Concentration, Deformation, and Deflection- Ongoing.
  2. Mr. Tumelo Moloi - Elevated Temperature and Temperature-Dependence of the Fatigue Behaviour of Additively Manufactured Titanium Ti6Al4V and TC18 (Ti–5Al–5Mo–5V–1Cr–1Fe) - Ongoing.
  3. Mr Philip Mokoena – Deformation and dislocation analysis of Laser Powder Bed Fusion parts for aircraft applications. Ongoing.

Ongoing Research

Additive manufacturing of lightweight alloys: A focus in demanding structural application.

Contacts

Personal contact: +254796364091/ +27630141847
Email address: amuiruri@seku.ac.ke or amos.mwangi.muiruri@gmail.com