Question

Amazon rectangular bar of low carbon steel A-36 is exposed to an axial strees of 150 MPa. What is the original length of the bar in m, if it elongates 1.35 mm under these conditions?

Answer 1

1.8m

Step-by-step explanation:

Let the Elastics of the steel ASTM-36
`E = 200000 MPa`

The strain of the bar when subjected to 150 MPa is

`\epsilon = (\sigma)/(E) = (150)/(200000) = 0.00075`

Therefore, if the bar elongates by 1.35 mm, then the original length L would be:

`\epsilon = (\Delta L)/(L)`

`L = (\Delta L)/(\epsilon) = (1.35)/(0.00075) = 1800 mm` or 1.8m