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To Determine Bend Test on Steel Bar

 
 

Apparatus:

UTM, test specimen, bending table support pin.

Procedure:

  1. Take a test specimen of the steel rod.

  2. Measure the diameter of the steel rod. Take at least 3 readings and calculate the mean.

  3. Now place the test specimen in the bending table specimen should be kept in the bending table in such a way that the plane

  4. Intersecting the longitudinal ribs is parallel to the axis of the pin.

  5. Select suitable rang of scale.

  6. Start the machine and start applying load continuously and uniformly throughout the bending.

  7. As the load is applied on the rod it will start bending.

  8. Discontinue the application of load when the angle of bent specified in the material specimen has been achieved before rebound.

  9. Take out the specimen and examine the tension surface of the specimen for cracking.

Specification for Angel in Bend Test:

Bar # 3 to Bar #11 should bend up to 180o without crack
Bar # 14 & Bar # 18 should bend upto90o without crack

This all specification has been given in AASHTO (American Association for Sate Highway and Transportation Officials)

Bend Test Requirements:

Bar No

Grade 40

Grade 60

Grad 75

3, 4, 5

3 ½ db

3 ½ db

-------------------

6

5 db

5 db

-------------------

7, 8

-------------------

5 db

-------------------

9, 10

-------------------

7 db

-------------------

11

-------------------

7 db

7 db

14, 18

-------------------

9 db

9 db

 

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