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Materials In Practice Tensile Strength Test

1177 words - 5 pages

SynopsisThe objective of this experiment is to measure the force required to stretch a specimen material until it breaks using modern tensile testing machine.In tensile test experiment, after knowing the measurement (thickness and width) of 4 different specimens, place one of the specimens to the grips. Start the test program, when the specimen breaks, test results and Load against Extension graph are obtained in the program.Through this experiment we can find the breaking load, maximum load, tensile strength and tensile modulus of different type of thermoplastic materials. Specimen with highest tensile strength is the strongest, which required larger amount of load to break the specimen. In this experiment, the result will show us that Purpose Polystyrene (GPPS) has the highest tensile strength and therefore breaking load is the largest among all other specimens.Introduction to Tensile testTensile test work out by pulling the sample from both end and measure the force required to pull the specimen until it fractures along with how much the sample elongate before breaking. This test is being conducted to test the ability of a material to resist breaking under tensile stress. It is being preformed for several reasons. Tensile strength is used in selecting materials for structural applications. Tensile properties are usually included in material specifications to ensure quality and often are measured during development of new materials, so that different materials can be compared.Theory by on tensile testTensile properties indicate how the material will react to forces being applied to it. A tensile test is probably the most basic mechanical test we can perform on material where a specimen is load in the tensile testing machine, measuring the applied load and the extension of the specimen over some distance. From tensile test, we can get a graph of load against extension, which than we can convert into a stress against strain curve. Stress is obtained by dividing the load by constant value, which is the area of the specimen. And strain is obtained by dividing the extension by another constant value, which is the original length of the specimen. The load-extension curve will have the same shape as the stress-strain curve since both stress and strain are obtain by dividing with a constant value. From the stress-strain curve, we can find out the tensile modulus at elastic region by dividing stress by strain. And from the load-extension curve, we can get tensile strength and yield strength by dividing the breaking load and maximum load by area respectively. However, we can only obtain yield strength for ductile material as a ductile material yields before failure, whilst a brittle material does not exhibit yielding.Procedure1.4 specimen are selected which is the General Purpose Polystyrene (GPPS), High Impact Polystyrene (HIPS), High Density Polyethylene (HDPE) and Polypropylene (PP).2.After thickness and width is measured and recorded, the particular...

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