The calculated Young's Modulus from the experiment using an extensometer was found to be 11 GPa, significantly lower than the expected value of 200 GPa for steel. The discrepancy likely arises from incorrect plotting of stress versus strain, as Young's Modulus is determined from the initial slope of this graph. It is crucial to ensure that the stress is measured in GPa and strain is dimensionless, focusing on the tangent to the curve at low stress values for accurate results.
PREREQUISITESStudents in materials science, engineers conducting tensile tests, and researchers analyzing mechanical properties of materials will benefit from this discussion.
Are you sure you plotted stress (in GPa) versus strain (dimensionless)? If you are looking for Youngs Modulus, you need to look at the initial slope of the graph you plot (i.e, tangent to curve at low stress value, although for steel the curve should be close to linear below the yield stress).MegaDeth said:Homework Statement
I carried out an experiment using a extensometer, had a range of values for the elongation and load. I calculated the value from the data and had 11GPa whereas it should be 200GPa. Do you know what could have gone wrong? Thanks a lot.