Department of Engineering
University of Hull
3rd December 2013
Abstract / Summary
This experiment is to determine the Young’s modulus of elasticity for a sample of brass, aluminium and mild steel. Also determine other material properties by testing the samples to failure. The report will include all calculations from the experiment along with results in graph and numerical forms. The experiment was a success but did have some abnormal results such as brass having higher than expected results and mild steel having lower than expected results.
Mark two 50mm gauge lengths on opposite faces of each sample with the marker pen (Example fig 1). Ensure that the gauge lengths overlap. By doing this the extension to fail results can be taken no matter where the material fails. Measure the cross sectional area of each sample.
Fig 1
Each sample should be clamped in the testing machine with the extensometer attached. Tensile load will be applied to the sample in increments of approximately 500N up to approximately 5000N. Record the elastic extension produced by each load. With the extensometer removed, the sample will be loaded until it fails. A graph of load and extension will be produced by the testing machine. Measure the cross sectional area of each sample at the fracture. Measure the final length of each sample by reassembling the pieces and measuring between the gauge marks. Consideration should be taken to the accuracy of these measurements.
