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# lab9(new) - CE 497 Compression Testing of Metals Section 5...

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CE 497 Compression Testing of Metals Section 5

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Hui Fan 4/2/2009
INTRODUCTION In this lab, experiments were conducted to investigate the relationship between stress and strain and the relationship between axial and transverse strain. The compression was applied to the specimen and two pairs of strain gages were attached to the surface of specimen to measure the axial and transverse strain. After collecting and processing the data, we expect to find the value of Yong’s elastic modulus and Poisson’s ratios for both specimens. PROCEDURE According to the Hooke’s Law, most engineering materials exhibit a linear relationship between stress and strain within the elastic region and this relationship can be expressed as: Axial Stress = E(young’s elastic modulus) * Axial Strain. When a load is applied to specimen, it changes its length and radius. There is a linear relationship between the transverse strain and axial strain: Poisson’s ratio= |transverse strain/ axial strain|. In this experiment, compression is applied to the ends of the specimen with dimension 3”*1” diameter. To ensure the specimen in the elastic region, the load is added 1000 lb per time. For 1020 HR Steel, up to 10000 lb compression is added and for aluminum, 8000lb is added. We then calculate the stress using the formula: stress=load/area. After we collected and processed the data, we plotted graphs and expected to observe the linear relationship between strain and stress, axial and transverse strains. We also expected to find out the Yong’s modulus and Poisson’s ratios for both specimens by calculation and graph method.

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