Title Page………………..i




Table of content………vii


1.1 Background of the Study

1.2 Statement of the Problem

1.3    Objectives    

1.3.1 Main Objective                                                        

1.3.2 Specific Objectives                                                  

1.4 Significance of the Project

1.4  Scope of Work           


2.1 Tensile Testing Process                                                                                                               

2.2 Tensile Test Specimen

2.3  Tensile Test Equipment

2.4  Tensile Testing Standards for Metals


3.1 Introduction                                                 

3.2 Materials                                             

3.3 Methods                                              

3.3.1 Material Selection                                                      

3.3.2. Power Screws                                            

3.3.3 Nuts for Power Screws                                         

3.3.4. Guide Rods

3.3.5 Gear Train - Gears, Gear Shafts and Retainers                                                        

3.3.6 Cross-Members                               

3.3.7 Base Box                                                        

3.3.8 Lower Wedge-Grip Holder                                          

3.3.9 Wedge Grips                                            

3.3.10 Bearings                                                               

3.3.11 Electric Motor and Speed Controls                                

3.3.12 Load Cell and Extensometer                                 

3.3.13 Data Acquisition Devices                               

3.3.14 Lubrication                                           

3.3.15 Maximum Deflections of Machine Parts                          

3.3.16 Selection of Manufacturing Processes   


 4.1 Working Design Drawings and Process Sheets for the Manufacture of Power

           Screws, Nuts, Guide Rods and Slotted Discs.

4.2 Working Design Drawing and Process Sheet for the Manufacture of Fixed Cross-

         Head of Tensile Testing Machine

4.3 Working Design Drawing and Process Sheet for the Manufacture of Tensile      

    Testing Machine Moving Cross-Head

4.4 Working Design Drawings and Process Sheets for the Manufacture of Tensile

      Testing Machine Base Box

4.4.1 Working Design Drawing and Process Sheet for the Manufacture of Tensile

        Testing Machine Base Box Cover

4.4.2 Working Design Drawing and Process Sheet for the Manufacture of Tensile

        Testing Machine Base Box Bottom

4.5 Working Design Drawings and Process Sheets for the Manufacture of Tensile

     Testing Machine Gear Train Components

4.5.1 Working Design Drawings and Process Sheets for Manufacture of Gears, Keys,

     and Transmission Shaft of Tensile Testing Machine

4.5.2 Working Design Drawings and Process Sheets for Manufacture of Gear      

       Retainers, and Gear Train Pillars of Tensile Testing Machine

4.6 Working Design Drawing and Process Sheet for the Manufacture of Lower      

    Wedge-Grip Holder for Tensile Testing Machine

4.7 Engineering Working Design Drawing and Process Sheet for the Manufacture of


    Adapter Plates, Spacer, and Vibration Damping Pads for the Tensile Testing

4.8    Assembly of Tensile Testing Machine                                         

4.8.1 Assembling the Gear Train                                     

4.8.2 Assembling the Lower Wedge-Grip Holder

4.8.3 Assembling the Tensile Testing Machine                                    

4.9 Bill of Engineering Measurements and Estimates (BEME)   


  5.1  Summary                                                       

5.2  Conclusion                                                          

5.3 Engineering Implications of Work

5.4 Contribution to Knowledge                                      

5.5    Recommendations                                                  


                                                         CHAPTER ONE


1.1 Background of the Study

      Tensile testing, which is also known as tension testing (Horst et al, 2006), is a fundamental material  test, where a standard sample is subjected to controlled tensional loading until the material fails and fractures. The test results are generally used in materials selection in design applications, prediction of material behaviour under different types of loading other than uniaxial tension, and for quality control. Tensile properties of materials are often measured during the development of new materials and processes so that different materials and processes of manufacture can be compared (Davis, 2004).

      Tensile testing directly records the load/elongation profile of the test specimen. In particular, tensile testing measures properties such as the yield point, maximum load, and load at fracture. It also measures uniform and maximum elongation, as indices of ductility. Using these data, both the engineering and the true stress-strain curves can be plotted from which the material’s fundamental properties such as Young’s Modulus, Yield Strength, Ultimate Tensile Strength, Poisson ratio and strain-hardening characteristics can be computed using appropriate algorithms.

      For isotropic materials, the most commonly used test for obtaining mechanical properties is the uniaxial tensile test, while for anisotropic materials such as composites and textile materials, multi-directional tensile testing serves to enable the parameterization of the extent of anisotropy.

1.2 Statement of the Problem

      The dearth of necessary and needed infrastructure in the nation’s institutions of learning is glaring to all concerned. The need for students in general, and engineering students in particular, to have a firm and practical grasp of the all-important tensile test cannot be over-emphasized.

      Hence, the need to develop an instructional model of the tensile testing machine using, as much as possible, locally sourced materials, in order to bridge the gap between theoretical lectures on tensile testing and the much needed practical aspect of it.

1.3    Objectives    

      The objectives of this project include the main and specific objectives which are outlined below:                                                                             1.3.1 Main Objective                                                             The main objective of the project is the design of a 60 kN capacity electromechanically powered tensile testing machine.                                                            1.3.2 Specific Objectives                                                         The specific objectives of this project include:

(i)     Specification of the various parts of the machine.

(ii)     Specifying optimal engineering materials, from which the various parts can be made,           based on a compromise of factors such as cost, availability of materials and amenability           to locally available fabrication process.

(iii)     Production of the detailed design drawings of the machine parts as well as the assembly           drawing of the machine as a whole using AutoCAD design and modeling software.

(iv)     Contribute to the process of bridging the gap between theory and practical in the                teaching of materials testing.

1.4 Significance of the Project

       The significance of the project includes the qualitative impartation of the knowledge of materials testing to students practically, as opposed to mere theory and the attendant difficulty of comprehension.

1.4  Scope of Work    

In this project, the dual column type of a 60 kN capacity tensile testing machine, including the various parts, will be designed. The specimen-holding cross-heads, based on ASTM E8/E8M Standards, will also be specified. Accommodation will be made in the design for the critical components such as the load cell and extensometer to be purchased and fitted on the machine. These are, however, expected to be fully integrated into the machine on subsequent and further work by students. The present model design will be for uniaxial loading only, complete with compression and bending capabilities. Finally, detailed design drawings of the machine and its various parts will be produced using AutoCAD design and modeling software.



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