Asked by  | 6th Feb, 2010, 12:18: AM

Expert Answer:

Do you need explanation of the Extenstion vs load curve or the Experiement? Please find a short description of the experiment below.

When a stress is applied to a material, it will deform. In this experiment we calculate
Young’s modulus, the constant of proportionality between tension strain and stress in a
wire. The stress will be produced by placing kilogram weights on a hanger suspended
from a steel wire. We will use a micrometer screw to determine elongation, from which
we calculate the amount of strain.

Young’s modulus refers to tension/compression stress; for the case of a wire, the stress
will always be tension. (You cannot push with a wire, which would give compression
stress.) Young’s modulus is found by the ratio of stress to strain. Because the numbers
are small, it is usual to use a graph and take the slope in order to get a better value of the




Answered by  | 6th Feb, 2010, 10:28: AM

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