STRUCTURES LAB 1

STRUCTURES LAB 1 - TENSION TESTING AND STRESS...

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Unformatted text preview: TENSION TESTING AND STRESS CONCENTRATIONS Date(s) Performed 02/22/2008 02/29/2008 Friday 11:00 am MAE 4284 Florida Institute of Technology Aerospace Engineering Program SYRUS JEANES Group Members: Marco Herrera, Joshua Gauvin, Tyler Jandreau, Anthony Costantini, Zoe Morozko, Kyle Chapman, Ben Holohan, Adam Cooper, Ivan Mravlag, Robert Radomski Introduction The purpose of this lab was to test certain material specimens in order to determine specific characteristics of said materials. In this experiment we tested several samples of Al 2024 and Al 6061. So called dogbone specimens of 2024 and 6061 were subjected to a tensile test while 6061 specimens with a hole in the center were subjected to the same test. Also, a large sample, similar in nature to the hole specimens was also tested but not to failure. The data from these tests were then analyzed to give several important characteristics of the materials, consisting of Modulus of Elasticity, Poisson Ration, Yield and Ultimate Strength and Stress Concentrations. Procedure The specific samples tested are as follows: two dogbone samples of Al 2024-T351 and Al 6061 T651; two hole specimens of Al 6061-T651 and a single, large hole specimen of Al 6061-T651. The dimensions of the specimens are listed in the table below. Strain gages were placed on each specimen in strategic locations. Gages were placed on the dogbones in both the axial and transverse directions to measure y and x strains respectively. Using these strains, the Modulus of Elasticity and Poissons Ratio for each sample were calculated. The Modulus of Elasticity is a measure of the elasticity of a material, and Poissons ratio is the relationship between contraction or expansion in one direction versus the change in contraction or expansion in the perpendicular direction. Longitudinal Gage Transverse Gage For the hole specimens, 2 gages were placed inside the hole; one longitudinally and one transverse while another gage was placed outside the hole in the longitudinal direction. The gages in the hole gave x and y strain data at a very critical point, which was used to calculate the maximum stress seen by the sample. The external longitudinal gage was placed midway between the clamp and the hole so as to alleviate any of the stress concentration effects due to both the clamp and the hole. Using these data, the Stress Concentration Factor was calculated. The large hole specimen had one longitudinal specimen place in hole as well as on the outer edge of the specimen. Between these gages, three more were placed equidistant from each other in the longitudinal direction. Readings from these gages enabled us to create a Stress Distribution Graph for several loading conditions....
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This lab report was uploaded on 04/21/2008 for the course MAE 4281 taught by Professor Fleming during the Spring '08 term at FIT.

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STRUCTURES LAB 1 - TENSION TESTING AND STRESS...

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