# stress and strain

for a tensile test on a specimen,having a diameter of 7.20mm and a gauge length of 55mm,the following results were recorded:

FORCE: (kn) --------------- EXTENSION X10 負3次方 (m)

2.0 ---------------------------------- 0.012

5.0 ------------------------------------ 0.03

10 ----------------------------------- 0.059

15 ------------------------------------- 0.0905

20 ------------------------------------ 0.1215

25 ----------------------------------------0.15

plot the stress/strain graph and calculate the modulus of elasticity for the material

(順便列明步驟點計,同d單位應該點轉換thx~~~~~)

### 1 Answer

- Prof. PhysicsLv 71 decade agoFavorite Answer
For the graph, please go to the following link:

http://s726.photobucket.com/albums/ww265/physicswo...

圖片參考：http://i726.photobucket.com/albums/ww265/physicswo...

As F = 入x/l, where 入 is the modulus of elasticity.

We take Force 2.0 (kN)

2000 = 入(0.012 X 10-3) / (55 X 10-3)

Modulus of elasticity, 入 = 9.17 X 106 N

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