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PROF GEORGE O RADING

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Publications


2021

A A Fabuyide, Cornish LA, Apata AO, Rading GO, Muobeni TN, Witcomb MJ, Jain PK, Borode JO.  2021.  Experimental Liquidus Surface Projection and Isothermal Section at 1000C of the V-Ni-C System, J of Phase Equilibria and Diffusion.

2019

Ngugi,(1) J, Rading GO, ODERA BO, Ngibe B, Forbes R, Cornish LA.  2019.  Partial Isothermal Sections of the Cu-Rich Corner of the Al-Cu-Zn System at 200 and 240°C. J of Phase Equilibria and Diffusion. . :588-599.

2016

Rotich,(2) SK, Rading GO, Kavishe FPL, Chown L.  2016.  Fatigue Crack Growth and Fatigue Strength Characteristics in the HAZ of AA 7075 T651. African J of Sci and Tech (AJST), 13(2), . :1-12.

2015

Odera,(3) BO, Papo MJ, Couperthwaite R, Rading GO, Billing D, Cornish LA.  2015.  High-Order Additions to Platinum-Based Alloys for High Temperature Applications. J Southern Africa Institute of Mining and Metallurgy, 115. :241-250.
Njoroge,(4) KD, Rading GO, Kihiu JM, Witcomb MJ, Cornish LA.  2015.  The Dislocation Core Misfit Potential. Comput. Mater. Sci. 100. :195-202.

2014

Njoroge,(5) KD, Rading GO, Kihiu JM, Witcomb MJ, Cornish LA.  2014.  ) The Impact of Interstitial Carbon on Dislocation Motion in the Alpha-Fe Lattice. , Int J Computational Engineering Research, 4 (12), . :5-9.
Apata,(6) AO, Muobeleni TN, A A Fabuyide, Ogunmuyiwa EN, G.O.Rading, Jain PK, Witcomb WJ, Cornish LA.  2014.  Development of VC-Ni Eutectic Alloys for Wear Resistance. Advanced Materials Research, 1019. :347-354.
Odera,(7) BO, Papo MJ, Rading GO, Cornish LA.  2014.  Experimental Solidification Projection, Liquidus Surface Projection and Isothermal Section at 1000oC for Pt-Cr-V System. J Phase Equilibria and Diffusion, 35 (4). :476-489.
Mwero,(8) JN, Abuodha SO, Mumenya SW, Rading GO, Kavishe FPL.  2014.  Durability Characteristics of Concrete Containing Sugar Cane Waste Fiber Ash (SWFA). ICASTOR J. of Eng. 7 (2), . :95-114.

2013

Mwero,(9) JN, Abuodha SO, Mumenya SW, Rading GO, Kavishe FPL.  2013.  The Effect of Partial Replacement of Portland Cement with Sugar Cane Waste Fiber Ash (SWFA) on Mechanical Properties of Concrete. ICASTOR J. of Eng. 6 (3). :97-114.

2012

Mbuge,(3) DO, Gumbe L, Rading G.  2012.  Service Life of HDPE Plastic Dam Lining. , Saarbrucken: Lambert Academic Publishing
Rading, GO.  2012.  D O Mbuge, L Gumbe and G O Rading: Service Life of HDPE Plastic Dam Lining. , Saarbrucken: Lambert Academic Publishing
Rading, GO.  2012.  B O Odera, L A Cornish, M B Shongwe, G O Rading and M J Papo: As Cast and Heat Treated Alloys of the Pt-Al-V System at the Pt-Rich Corner. Journal of the Southern Africa Institute of Mining and Metallurgy. 7A:505-515.
Njoroge, KD.  2012.  Dynamic Analysis of Dislocation Cores in a-Fe Lattice Using the Embeded Atom Model. International Journal of Computational Engineering Research. 2(3):851-859.

2011

Kihiu, J, Rading G, Mutuli S.  2011.  Boiler, Piping and Pressure Vessel Cross-Bore Design Stresses. , Saarbrucken: VDM Publishing
ODERA, BO, Cornish LA, Rading GO, Papo MJ.  2011.  Solidification projection of the Pt-Al-V system at the Pt-rich corner.
and D O Mbuge, GRLGO.  2011.  Analysis of Natural Degradation of HDPE Lining Using Time-Dependent Properties. Polymer Engineering and Science. 51(6):1198-1205.

2010

Rading, GO.  2010.  D O Mbuge, L Gumbe and G O Rading: Analysis of the Weld Strength of High Density Polyethylene Dam Liner. African Journal of Science and Technology. 11(2):12-23.
Rading, GO.  2010.  A Parametric Investigation of Steel Fibres from Waste Tyres as Concrete Reinforcement. Icastor Journal of Engineering. 3(3):283-299.

2009

ODERA, BO, Cornish LA, Süss R, Rading GO.  2009.  A study of phases in selected alloys from the Pt-Al-V system in the Pt-rich corner.

2007

Rading, GO.  2007.  Concise Notes on Materials Science and Engineering. , Victoria: Trafford Publishing
Rading, GO.  2007.  J M Kihiu, G O Rading and S M Mutuli: Universal SCFs and Optimal Chamfering in Cross Bored Cylinders. International Journal of Pressure Vessels & Piping. 84:396-404.
Rading, GO.  2007.  Concise Notes on Materials Science and Engineering. , Victoria BC: Trafford Publishing

2006

MBUYA, TO, ODUORI MF, Rading GO, WEKESA MS.  2006.  Effect of runner design on mechanical properties of permanent mould aluminium castings. AbstractWebsite

A comparison of the influence of different runner designs on the mechanical properties of aluminium castings has shown that filtered rectangular runners (FRRs) yield aluminium castings with higher and more reliable mechanical properties than the conventional unfiltered rectangular runners. Unfiltered vortex flow runners have also been shown to improve the reliability of the modulus of rupture of cast aluminium alloys over unfiltered rectangular runners. In the present paper, experimental results of a comparative study on the effect of the unfiltered vortex flow and FRR designs on the tensile strength of permanent mould aluminium castings are reported. The results show that an FRR yields castings with higher and more reliable tensile strengths than the unfiltered vortex flow runner. Castings poured into a mould with an FRR had strengths between 269 and 291 MPa and a Weibull modulus of 50·2 while castings poured into the vortex flow runner had strengths between 255 and 280 MPa and a Weibull modulus of 40·3.

Rading, GO.  2006.  J M Kihiu, G O Rading and S M Mutuli: Overstrain in Flush Optimum Chamfered Cross Bored Cylinders. Journal of Mechanical Engineering Science. 220:15-25.

2005

O, PROFRADINGGEORGE.  2005.  G. O. Rading An Evaluation of Residual Stress Distribution in Welded Compact Tension Specimens Using Neutron Diffraction J. Strain Analysis 40(2) (2005) p 211-216. Mountain Research and Development, vol. 8, no. 2.. : 2011 Abstract

The neutron diffraction technique was used to determine the residual stress field in welded compact tension specimens of the aluminium-lithium alloy M 2095. The deep penetrating characteristic of neutrons was exploited to evaluate the through-thickness variation in residual stress. Moreover, insight into the redistribution of these stresses was gained by extending a fatigue crack through the residual stress field and re-examining the stress distribution. The specimen without a crack was found to have a high compressive stress (of the order of -135 MPa) ahead of the notch. This rose to a maximum tensile stress of about 50 MPa, 22 mm from the notch, followed by a drop to negative values further ahead of the notch. It was observed that the magnitude of the stresses changed on moving into the thickness of the specimen. However, the form of the graph showing stress versus distance ahead of the notch remained unchanged. When fatigue cracks of different lengths were introduced, the magnitude of the stress close to the tip first increased with crack length, before decreasing and then rising again. Nevertheless, the form of the graph remained unchanged and the stress at the crack tip remained compressive. The paper concludes that any study of the response of a component to mechanical loading involving a residual stress field must take these factors (i.e. through-thickness stress variation and stress redistribution) into consideration.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

 

2004

O, PROFRADINGGEORGE.  2004.  J. M. Kihiu, G. O. Rading and S. M. Mutuli Transition, Convergence and Constancy in Radiused Entry Cross-Bored Cylinders Trans. Canadian Society of Mechanical Engineers 28 (2B) (2004) p 343-353. Mountain Research and Development, vol. 8, no. 2.. : 2011 Abstract

A 3D FEM computer program was developed to establish the stress distributions and SCFs in thick walled cylinders with radiused entry flush and non-protruding cross bores under internal pressure. The displacement formulation and eight noded brick isoparametric elements were used. The Frontal solution technique was used due to the limited computing facilities. The variation of SCF with entry radius to main bore radius ratio was established for varying cylinder outer radius to main bore radius ratio and cross bore to main bore radius ratio. For low values of cylinder outer radius to main bore radius ratio (≤2.25), the lower values of cross bore to main bore radius ratio resulted in lower SCFs. For high values of cylinder outer radius to main bore radius ratio (>2.25),  the lower values of cross bore to main bore radius ratio resulted in higher SCFs. The cylinder with cylinder outer radius to main bore radius ratio of 2.25 was found to be a transition geometry. For very small values of cross bore to main bore radius ratio, the SCFs converged to a value of 2.2 for entry radius to main bore radius ratio of 0.2. The cylinder outer radius to main bore radius ratio of 1.75 to 3 cylinders had a constant SCF value of 2.3 at cross bore to main bore radius ratio of 0.05 and entry radius to main bore radius ratio of 0.2. A new categorization of cylinders earlier proposed in the study of plain cross-bored cylinders is further validated.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

O, PROFRADINGGEORGE.  2004.  J. M. Kihiu, G. O. Rading and S. M. Mutuli Overstraining of Plain Cross-Bored Cylinders J. Mechanical Engineering Science Vol. 218(2) (2004) p 143-153. Mountain Research and Development, vol. 8, no. 2.. : 2011 Abstract

A 3D FEM computer program was developed to establish the stress distributions and SCFs in thick walled cylinders with radiused entry flush and non-protruding cross bores under internal pressure. The displacement formulation and eight noded brick isoparametric elements were used. The Frontal solution technique was used due to the limited computing facilities. The variation of SCF with entry radius to main bore radius ratio was established for varying cylinder outer radius to main bore radius ratio and cross bore to main bore radius ratio. For low values of cylinder outer radius to main bore radius ratio (≤2.25), the lower values of cross bore to main bore radius ratio resulted in lower SCFs. For high values of cylinder outer radius to main bore radius ratio (>2.25),  the lower values of cross bore to main bore radius ratio resulted in higher SCFs. The cylinder with cylinder outer radius to main bore radius ratio of 2.25 was found to be a transition geometry. For very small values of cross bore to main bore radius ratio, the SCFs converged to a value of 2.2 for entry radius to main bore radius ratio of 0.2. The cylinder outer radius to main bore radius ratio of 1.75 to 3 cylinders had a constant SCF value of 2.3 at cross bore to main bore radius ratio of 0.05 and entry radius to main bore radius ratio of 0.2. A new categorization of cylinders earlier proposed in the study of plain cross-bored cylinders is further validated.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

2003

O, PROFRADINGGEORGE.  2003.  J. M. Kihiu, S. M. Mutuli and G.O. Rading Stress Characterization in Autofrettaged Thick Walled Cylinders Int. J. Mechanical Engineering Education. 31(4) (2003) p 370-389. Mountain Research and Development, vol. 8, no. 2.. : 2011 Abstract

The inaccessibility of commercial software has necessitated the development of low-cost, general-purpose finite element method (FEM) computer programs for structural analysis. Using the FEM program, the elastic, elastic-plastic, residual and service stresses and displacements in a closed ended, thick-walled cylinder under internal pressure were established. The displacement formulation was implemented and eight-noded brick isoparametric elements chosen. The frontal solution technique and the incremental theory of plasticity were used, as only limited computing facilities were available. The results were found to be in very good agreement with the through-thickness analytical values. The benefits of autofrettage were demonstrated and an optimum overstrain of 16% established for a cylinder with a thickness ratio of 2. The material economy achieved through autofrettage and the limitations imposed are illustrated. The FEM program could therefore be reliably used for other complex geometries and load conditions.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

O, PROFRADINGGEORGE.  2003.  J.M. Kihiu, G.O. Rading and S. M. Mutuli Geometric Constants in Plain Cross-Bored Cylinders J. Pressure Vessel Technology, 125 (2003) p 446-453. Mountain Research and Development, vol. 8, no. 2.. : 2011 Abstract

A 3D FEM computer program was developed to establish the stress distributions and SCFs in thick walled cylinders with radiused entry flush and non-protruding cross bores under internal pressure. The displacement formulation and eight noded brick isoparametric elements were used. The Frontal solution technique was used due to the limited computing facilities. The variation of SCF with entry radius to main bore radius ratio was established for varying cylinder outer radius to main bore radius ratio and cross bore to main bore radius ratio. For low values of cylinder outer radius to main bore radius ratio (≤2.25), the lower values of cross bore to main bore radius ratio resulted in lower SCFs. For high values of cylinder outer radius to main bore radius ratio (>2.25),  the lower values of cross bore to main bore radius ratio resulted in higher SCFs. The cylinder with cylinder outer radius to main bore radius ratio of 2.25 was found to be a transition geometry. For very small values of cross bore to main bore radius ratio, the SCFs converged to a value of 2.2 for entry radius to main bore radius ratio of 0.2. The cylinder outer radius to main bore radius ratio of 1.75 to 3 cylinders had a constant SCF value of 2.3 at cross bore to main bore radius ratio of 0.05 and entry radius to main bore radius ratio of 0.2. A new categorization of cylinders earlier proposed in the study of plain cross-bored cylinders is further validated.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

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