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Department of Engineering Technology CET 345W Materials Testing Laboratory Experiment No. 6 Tension Test of Metals Civil Engineering Technology Old Dominion University Video Lecture Old Dominion University Engineering Technology Department Kaufman Hall, Room 149 Norfolk, VA 23529 Table of Contents
1. Summary …………………………………………….…………………………… 1 2. Procedure ……….………………………………………………………………… 1 3. Laboratory Equipment………….………………….……………………………… 2 4. Experiment Requirements ….…….………………………………………………. 3 5. Required Data …………….…….………………….……………………………. 3 6. Sample Calculations ….…….…….……………….……………………………. 9 7. Sketches/Graphs …………….…….……………….……………………………. 10 8. Conclusions/Analysis …………………………….………………………………. Appendix 1: References Appendix 2: Tension Test of Metals
1 1. Summary The ability to determine at which point materials cease to behave elastically and fail can be valuable when determining which materials to use to design safe structures. A safe material to use can be defined as a material at which the strength of the member is greater than the internal forces as a result of externally applied loads. If a material is not as strong as the internal forces resulting from externally applied loads, then it is deemed to fail. Tension tests provide the information needed to determine the strength and ductility of materials. During this experiment a tension test will be conducted on an aluminum, steel, and cast-iron specimen. A series of loads will be applied to each specimen. By applying loads to each specimen, we can observe both the load and its corresponding elongation, and at which load that the specimen reaches failure. With this information, a stress vs. strain curve will be developed. Using the stress vs. strain curve we will determine various mechanical properties of each specimen. Knowing the information on the mechanical properties of each specimen can provide insight on the suitability of each metal in different structural design scenarios. 2. Procedure I. Identify, Measure, and Mark 1. Measure the dimensions of the aluminum specimen, steel specimen, and cast- iron Specimen. a. Zero the digital micrometer before each measurement. b. Measure the width of the aluminum and steel specimen three times and calculate the average. c. Measure the thickness of the aluminum and steel specimen three times and calculate the average. d. Measure the diameter of the cast iron specimen three times and calculate the average. 2. Mark the aluminum specimen in preparation for the test by drawing a horizontal line across the specimen and then marking the specimen with a series of X’s beginning at the center and moving an inch out on either side of the specimen. Repeat for each specimen.

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