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Lab Seven - opposed to remaining rigid prior to a buckling...

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Chase Machemehl November 1, 2007 Mrs. JoAnn Scales Section 10, Thursday 1-4pm Materials Science and Engineering Vanderbilt University Nashville, TN 37235 Beam Compression Dear Mrs. Scales, The following report details the results of the lab experiment performed Thursday October 18 th , 2007. The purpose of the experiment was to analyze the failure of cylindrical beams under compressive loading. Beams of birch, steel, aluminum, and nylon were examined. Lengths varying from 5 cm to 17.5 cm were examined. The samples were loaded into the load frame with spherical end pieces to allow for angular displacement upon compression. Students measured the specific dimensions of each sample using digital calipers. Each sample was then loaded in the pneumatic load frame and placed under compression. The maximum load sustained by each beam was recorded in a spreadsheet. Shorter samples failed by immediate buckling, sustaining a load up to a certain point and then bending severely at the maximum load. Longer samples gradually bent; as
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Unformatted text preview: opposed to remaining rigid prior to a buckling, they slowly deflected until the maximum load was exceeded and the beam had effectively bowed over (except for the birch sample). The attached graphs show the relationship between pressure and length divided by radius. The trend in each graph is a negative proportional progression such that increased length supports a smaller load to failure. This lab was a wonderful success; students developed an understanding of compressive forces and their development of failure in a longitudinally compressed beam. The relationship between length and compressive endurance was established and examined. Student’s familiarity with compression was developed exponentially, as the students previous experience with compression was incredibly limited and mostly theoretical. Thanks to this lab the students are now much more familiar with compressive forces in beams and their effects. Sincerely, Chase Machemehl...
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