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Laboratory Investigation of Hooke’s Law

Hooke's Law Spring
 
 

Apparatus:

UTM , test specimen, divider, vernier caliper, scale.

Procedure:

  1. Prepare the test specimen that is steel bar and find its diameter at tree different places and find its man value.

  2. Mark two points 8" a part of 2 ft long steel bar.

  3. Insert the bar in jaws for gripping the steel bar and select suitable bar on UTM. Place the steel bar and fix it.

  4. Start t machine and start applying load.

  5. There will be gradual increase in length which will be directly proportional to applied load.

  6. During this load application measure change in length at different load, till the steel bar breaks.

  7. Find the stress and strain at those points and investigate the law by drawing the graph between stress and strain

S No Dia of Bar Load(Tons) Elongation Area of Bar Stress = Load/Area Strain= Elongation/Gauge Length
01 ¾ in 3.68 0 in 0. 441 in2 8.34 Psi 0
02 ¾in 6.84 0 in 0. 441 in2 15.51Psi 0
03 ¾ in 10.28 0 in 0. 441 in2 23.31 Psi 0
04 ¾ in 10.72 1/8 in 0. 441 in2 24.30 Psi 0.0156
05 ¾in 11.82 3/16 in 0. 441 in2 26.80 Psi 0.0234
06 ¾in 12.04 ¼ in 0. 441 in2 27.30 Psi 0.031
07 ¾in 13.04 5/16 in 0. 441 in2 29.56 Psi 0.039
08 ¾in 13.78 7/16   in 0. 441 in2 31.24   Psi 0.054
09 ¾in 14.34 9/16   in 0. 441 in2 32.51 Psi 0.070
10 ¾in 14.88 11/16 in 0. 441 in2 33.74 Psi 0.085
11 ½  in 12.6 (Rupture) -------------- 0. 196 in2 64.28 Psi ---------------------
12 ½  in 15.86 (Ultimate) 2 ¼ in 0. 196 in2 80.91 Psi 0.218
 

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