32 1045 cold rolled steel during the tension test a

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3.2 1045 Cold-Rolled Steel
surface of the specimen was examined. The fracture surface was determined to be a cup and cone fracture. The angle of the failure surface was approximately at 45 degrees. A picture of the fracture surface can be seen in figure 1c. The final parameters calculated were the percent elongation and percent reduction of area. The percent elongation and percent reduction of area were calculated to be 21.1% and 55.1%, respectively. The 1045 normalized steel yielded once the stress level reached 520 MPa. The ultimate strength of the specimen reached 752 MPa long before failure occurred. The full stress-strain curve for this specimen can be seen in figure 5. In order to determine the Young’s modulus the elastic region of the stress-strain must be examined. Unlike some of the other test specimens 1045 normalized steel has a definite yield point. The elastic region of the stress-strain curve for 1045 normalized steel is shown in figure 6. A linear trend line was fitted to the elastic region of the curve and the equation of the line was determined to be y = 212220x + 13.99. Therefore, the Young’s modulus of 1045 normalized steel is 212220 MPa, or 212 GPa.A summary of these results is shown in table 1.

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