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plastic tensile strength - German-Jordanian University...

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German-Jordanian University Industrial Engineering Department Material Science Lab (IE2210) Fall 2007 Dr. Safwan A. Altarazi, Eng. Nidal Ha’boush, Eng. Abeer Daood Student Name: Experiment Title: “Tensile Testing of Plastics” Objectives: This method is used to investigate the following: 1. The tensile behavior of the testing specimens, 2. Determining the following properties: The relationship between tensile stress and strain, The yield point, Modulus of elasticity, Tensile strength, Percentage of elongation. Out of Mark Title 10 Abstract 15 Introduction 15
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Material Science Lab. IE2210 Method 30 Results 20 Discussion and Conclusion 10 Report Organization and Neatness 100 Total Mark Abstract This experiment is similar to our first experiment (“Tensile Testing of Metals”), however, it is conducted on plastics rather than on metals. In this experiment, we will have three plastic specimens on which tension is applied in a single direction. Thus, the mechanical property tested for will be tension and our results for the three test specimens will be compared. The importance of this test is that it specifies the general principles for determining the tensile properties of plastics under defined conditions. Different types of test specimens are defined to suit different types of materials. Introduction The principle of the tensile test is the resistance of a material to a tensile load applied to a specimen. The mechanical properties of polymers are specified with many of the same parameters that are used for metals: modulus of elasticity, yield strength and tensile strength. This test (the simple stress-strain test), is employed for the identification of some of these mechanical parameters. The mechanical properties characteristics of polymers, for the most part, are highly sensitive to the strain rate (rate of deformation), the temperature and the chemical nature of the environment. In this test, a specimen is held firmly between a fixed beam and a moving crosshead. A load cell measures the stress built up in the material as it is pulled by the moving crosshead and the extensometer measures the change in length of the specimen.
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