Tensile Test Lab - Tensile Testing EMA3012C Lab Time Friday...

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Tensile Testing EMA3012C March 28, 2008 Lab Time: Friday 1:30 pm Jean-Claude Le
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Abstract A tensile test was performed on three different samples with similar dimensions. All three samples were made of the same material. Data measurements were taken and recorded. The samples were tested to determine the Young’s Modulus, Ultimate Tensile Strength, percent elongations, percent area reduction, as well as other relevant data such as stress and strain. The results for the average Ultimate Tensile Strength was 19.595 kN and the average Young’s Modulus was found to be 27.141 kN/mm. The average percent elongation and area reduction were found to be 8.8% and 52.87% respectively. Overall, the recorded data was deemed precise as the standard deviation was relatively low. Introduction There are many types of testing machines. The most common are universal testing machines, which test materials in tension, compression or bending. The primary use of the testing machine is to create the stress-strain diagram. Once the diagram is generated, a pencil and straight edge or computer algorithm can be used to calculate yield strength, Young’s Modulus, tensile strength or total elongation. There are two classes of testing machines, electromechanical and hydraulic. The electromechanical machine uses an electric motor, gear reduction system and one, two or four screws to move the crosshead up or down. A range of crosshead speeds can be achieved by changing the speed of the motor. A microprocessor based closed-loop servo system can be implemented to accurately control the speed of the crosshead. A hydraulic testing machine uses either a single or dual-acting piston to move the crosshead up or down. In a manually operated machine, the operator adjusts a needle valve to control the rate of loading. In a closed- loop hydraulic servo system, the needle valve is replaced by an electrically operated servo-valve for precise control. In general, the electromechanical machine is capable of a wide range of test speeds and long crosshead displacements, whereas the hydraulic
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Tensile Test Lab - Tensile Testing EMA3012C Lab Time Friday...

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