To Determine Yield Strength & Tensile Strength of a Steel Bar

Apparatus:

UTM, Test Specimen, Vernier Calipers, Ruler etc.

Description of UTM:

A machine designed to perform tensile, compression, bend and shear tests, is called UTM,. It mainly consists of two parts.

• Loading Unit, control unit. In addition to these units, there are certain accessories like bending table, jaws for gripping recorders etc.
• Loading unit consists of two crossheads i.e upper cross head and lower cross head and a table

Procedure:

1. Prepare a test specimen of at least two feet.

2. Measure caliper at least at three places and then find average.

3. Insert the suitable jaws in the grip and select a suitable load scale on UTM.

4. Insert the specimen in the grip by adjusting the cross heads of UTM.

1. Start machine and continue applying the load.

2. At a point when the values of the load at that point this is called yield point.

3. When the specimen breaks stop the machine.

4. Note the ultimate value of the load.

5. Determine the yield strength and tensile strength of load dividing the yield load & ultimate load by cross sectional area of the bar.

Gauge length = 8 inch

ASTM Standards

Elongation = 9.8 – 8 = 1.9

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