Explain in less than 100 words, how you can obtain the young's modulus of a material using a tensile machine.

Answer with Explanation:

In a tensile test in an tensile machine the following steps followed to obtain the young's modulus:

1) A specimen of material with known cross sectional area and gauge length is loaded axially.

2) The load is increased and the corresponding change in the gauge length of the material is noted by using a deflectometer or a dial gauge.

3) The ratio between Force applied and the nominal cross section known as stress is calculated for each applied value of force until the material fails.

4) The ratio between the change in gauge length and the original gauge length is found this ratio is known as strain.

5) A graph is plotted between the values calculated in step 3 and 4 above.

6) The slope of the line at the origin of the graph gives the young's modulus of the material.