Lab report Essay Example | Topics and Well Written Essays - 750 words - 3

Lab report - Essay Example The ration of the extension in length to the original length is referred to as tensile strain. Consequently, modulus of elasticity of the material is obtained by finding the ration between tensile stress and strain. The measurement of extension of a material before it snaps enables the classification of the material or specimen as ductile or brittle. The yield strength of a ductile material is obtained when the expansion is 0.2 percent. In order to understand the behavior of materials under high stress or loading rates, impact test is done. Impact tests are usually done using Izod or Charpy procedures. Impact test on steel and plastic aims at establishing their toughness. Impact test determines the behavior of a material under high stress levels that include tension/torsion and bending of the material. A specimen in impact test is broken by a single blow is a specially designed device. The energy spent in breaking the specimen in a single blow is the quality of the material or specimen. The property of a material varies with variation in temperature, thus conducting the experiment at different temperatures allows for the determination of change in properties of the material as temperature changes. Steel has a yield value of 43 ksi, which is approximately the same as the expected value. Also, the tensile strength and strain as well as ultimate strength before the material snaps are approximately the same as measured value. The modulus of elasticity of aluminum measured value tends towards 11 Msi as it approaches power six, which is perceived as equal value. The measured value for Plexiglas is very close to expected value as seen in Table 1. The temperature of the specimen affects impact test on the specimen. Consequently, in order to determine the effect of temperature on impact test, a similar specimen is tested under two different temperatures. The measured value or behavior of the specimen at two