M5_1 - NANYANG TECHNOLOGICAL UNIVERSITY First Year Common...

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NANYANG TECHNOLOGICAL UNIVERSITY First Year Common Engineering Course G172 : Laboratory Experiment 1B Formal Report for Experiment M5 Mechanical Properties Of Materials Date of experiment: Laboratory: Location:
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Contents I Introduction II Objective III Theory i. Tensile Stress ii. Tensile Strain iii. Percentage Elongation iv. Modulus of Elasticity or Young’s Modulus v. Flexural Strength vi. Tensile Strength vii. Ductility viii. Toughness ix. Crystalline and Amorphous Materials IV Experiment i. Specimens: Material, shape and dimension ii. Procedure iii. Precautions V Results of Mechanical Tests VI Questions and Answers i. What is the basic microstructure of metals, polymers and ceramics? ii. How does the microstructure determine the strength and ductility of metals, polymers and ceramics? iii. Why are steels stronger than aluminum alloys? iv. Account for the difference in strength of solution-treated and aged aluminum and annealed aluminum alloys. v. Is PS (Polystyrene) or PE (Polyethylene) stronger, and why? vi. Comment on the testing technique and strength of glass. VII Discussion VIII Conclusion IX Reference
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I Introduction Different types of material such as metals, polymers and ceramics have differing mechanical properties. Knowing this allows engineers to select the right material for the right application. This is so as to not to cause excessive deformation in material and that fracture will not occur. Basically, there are three broad categories of materials used in engineering application: metals, polymers and ceramics. The aim of this experiment is to study the differing mechanical properties of the three categories of materials. With that, we will explore the factors that can affect the mechanical strength of materials. These factors include: Category of material (e.g.: metal, ceramic or polymer) Type of material in that category (e.g.: cross linked or thermoplastics) Difference in microstructure of the same material (crystalline or amorphous) II Objectives i. To understand the different mechanical properties of materials ii. To study how 3 types of materials behaves in mechanical properties by conducting tensile and bend tests iii. To understand the major factors which determine mechanical properties of materials Atomic/ molecular bonding Amorphous/ crystalline structure Chemical structure III Theory Before the start of the experiment, there are some formulas one should be familiarize with. i. Tensile Stress ( σ ) Tensile stress ( σ ) is the instantaneous load applied to a specimen divided by its cross sectional are before any deformation. The formula is as follows: σ = F / A o is the engineering stress (MPa) is the applied force (N) is the original cross sectional area before deformation (m 2 )
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where σ F A o ii. Tensile Strain ( ε ) Tensile strain ( ε ) is the change in gauge length of a specimen (in direction of an applied stress) divided by its original gauge length. The formula is as follows: ε = ( l 1
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M5_1 - NANYANG TECHNOLOGICAL UNIVERSITY First Year Common...

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