Prof. Mutuli Stephen M. Publications |
1 | 2013 | Variability Of Fatigue Strength And The Effect Of Heat On Properties Of Reinforcing Steel Bars Made From Local Scrap Click to View Abstract
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2 | 2013 | Analysis Of The Single Toggle Jaw Crusher Kinematics Click to View Abstract
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3 | 2013 | Characterization Of The Mechanical Properties Of Reinforcing Steel Bars Produced From Scrap Metals : Case Study Of Kenya Steel INDUS Click to View Abstract
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4 | 2013 | Development Of An Experimental Rig For A Two-dimensional Stress And Strain Analysis Laboratory Experiment Click to View Abstract
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5 | 2013 | A Dislocation Density Evolution Model Of Metal Plasticity Click to View Abstract
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6 | 2013 | The Interfacial Bond Strength Of Sisal Fibre Reinforced Rice Husk Ash Cement Composite Click to View Abstract
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7 | 2012 | Advanced Topics In Solid & Structural Mechanics Click to View Abstract
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8 | 2012 | Fundamentals Of Solid And Structural Mechanics An Introduction To The Mechanics Of Elastic Deformation Of Structural Components Click to View Abstract
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9 | 2012 | An Intrinsic Dislocation Density – Finite Element Formulation Of Metal Plasticity Click to View Abstract
A computational model was developed to simulate elastic and plastic behavior in Body Centered Cubic (BCC) metals and alloys. The model provided for simultaneous simulation of the micro and macro length scales and used periodicity to link the two length scales. The model was implemented in a 3dimensional framework giving rise to a finite element technique incorporating intrinsic dislocation information in the simulation of the material’s behavior. The technique was validated by simulating loading over the elastic range and the immediate region beyond yield, of thin steel strips, and comparing the results to those obtained by conventional analysis. Stress-strain curves and slip plane percentage contribution factors were generated. Specifically the stress-strain curves generated upheld Hooke’s law and demonstrated a definite yield plateau followed by material recovery after yielding.
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10 | 2011 | Boiler, Piping And Pressure Vessel Cross-Bore Design Stresses A Quick Design Approach Click to View Abstract
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11 | 2011 | A Survey Of Ultrasonic Waves In Powder Transportation Click to View Abstract
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12 | 2011 | Determination Of Resonant Frequency Of A Piezoelectric Ring For Generation Of Ultrasonic Waves Click to View Abstract
Ultrasound technology has become an important aspect in material handling and machining. Standing and traveling ultrasonic waves have been applied in powder transportation, feeding, dosing and supply of small amounts of powder with high quantitative accuracy and precision. Piezoelectric actuators are the most commonly used to generate the ultrasonic waves in various devices. Hence, these devices have presented a unique, economic and simple means of accurate handling of powder. This paper describes the determination of the resonant frequency of a piezoelectric ring that can be applied for generation of the ultrasonic waves. The resonant frequency is important in determining the highest amplitude of the vibration of the ring.
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13 | 2011 | Optimal Placement Of A Piezoelectric Ring In An Ultrasonic Powder Transport System Click to View Abstract
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14 | 2006 | KIHIU J, RADING G.O, MUTULI S.M "Universal SCFs And Optimal Chamfering In Cross - Bored Cylinder" Accepted For Publication In The "International Journal Of Pressure Vessels And Piping". 2006 Click to View Abstract
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15 | 2006 | "Universal SCFs And Optimal Chamfering In Cross - Bored Cylinder Click to View Abstract
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16 | 2006 | Overstrain In Flush Optimal-chamfered Cross-bored Cylinders Click to View Abstract
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17 | 2004 | Effect Of Heat On Microstructure And Mechanical Properties Of Reinforcing Steel Bars Click to View Abstract
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18 | 2004 | Transition, Coverage And Constancy In Radiused Entry Cross-Bored Cylinders Click to View Abstract
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19 | 2003 | Stress Characterization Of Autofrettaged Thick-walled Cylinders Click to View Abstract
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20 | 2003 | Geometric Constants In Plain Cross-bored Cylinders Click to View Abstract
A three-dimensional FEM computer program was developed to establish the stress distributions and SCFs in thick walled cylinders with flush and nonprotruding plain 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. In the far field, the FEM stresses and displacements were in good agreement with the through thickness analytical values. The variation of SCF with d was established for various thickness ratios. For k> 1.25, the maximum hoop stress occurred away from the crotch corner when d≤0.2. For k=1.25, the maximum hoop stress occurred away from the crotch corner when d≤0.15. For k≥1.75, d was found to be a geometrical constant equal to 0.2 where the k values have a SCF of 2.734. For k
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21 | 2000 | Interfacial Bond Strength For Sisal 4 Fibre Composite Click to View Abstract
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22 | 1998 | Time And Space Management In Structural Analysis Problems Click to View Abstract
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23 | 1997 | An Investigation Of The Mechanical Properties Of Sisal Fibre, Loofah Matt And Their Composites With Epoxy Resin Click to View Abstract
The mechanical properties of sisal fibre, loofah matt, epoxy resin and their resulting composites were determined experimentally. The influence of volume fraction of the reinforcing fibres and matt on the mechanical properties of the composites was investigated. It was found that loofah matt reduces the mechanical properties of epoxy resin and as such loofah is not a suitable reinforcing material. Sisal fibre on the other hand does improve the mechanical properties of epoxy resin; the improvement being dependent on fibre volume fraction. This makes fibre reinforced composites useful practical materials. Based on the “effective reinforcement” and the advent of multiple matrix fracture, design limitations for the composites were set.
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24 | 1995 | Determination Of Interfacial Bond Strength Of Sisal Fibre Reinforced Epoxy Composites Click to View Abstract
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25 | 1988 | Velocity Fields In Grease Lubricated Contact Click to View Abstract
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26 | 1986 | Determination Of Velocity Fields In Newtonian And Non- Newtonian Lubricating Films Click to View Abstract
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27 | 1984 | Velocity Measurements In The Inlet Zone Of A Hydrodynamic Contact Click to View Abstract
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28 | 1983 | Mesure Et Analyse Des Champs De Vitesse A’ L’entrée D’un Contact Lubrifie Entre Deux Cylindres Click to View Abstract
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29 | 1982 | MUTULI S.M; BESSELL T.J And TALITWALA E.S.J "The Potential Of Sisal As A Reinforcing Fibre In Cement Base Materials" African Journal Of Science And Technology (ANSTI) Vol, No. 1 Pp. 5 - 16, April 1982. Click to View Abstract
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30 | 1982 | MUTULI S.M; BESSELL T.J And TALITWALA E.S.J "The Potential Of Sisal As A Reinforcing Fibre In Cement Base Materials" African Journal Of Science And Technology (ANSTI) Vol, No. 1 Pp. 5 - 16, April 1982. Click to View Abstract
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31 | 1982 | The Interfacial Bond Strength Of Sisal- Cement Composites Using A Tensile Test Click to View Abstract
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32 | 1979 | MUTULI S.M; "The Properties Of Sisal Fibre And Sisal Fibre Reinforced Composite Materials" M.Sc. Thesis, University Of Nairobi - Kenya, 1979. Click to View Abstract
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33 | 1979 | MUTULI S.M; "The Properties Of Sisal Fibre And Sisal Fibre Reinforced Composite Materials" M.Sc. Thesis, University Of Nairobi - Kenya, 1979. Click to View Abstract
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