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EXPERIMENTAL PROCEDURE :

1. Winded up pressure in the pressure cylinder until the screw rise about 5cm.2. Replaced the pressure plate with Brinell test unit (10mm steel ball).3. Screwed the lower plate in position.4. Positioned the steel test piece on the lower pressure plate, so that the center of the

steel ball is at least 20mm from the edge.

5. Winded up the pressure to 10kN slowly.6. Hold the load pressure for about 15 seconds.7. Measured the diameter of the indentation using the magnifying lens.8. The experiment using the other test pieces were repeated.9. The tensile strength of the specimens are calculated.

RESULTS

Material Diameter of

Indentation,d(mm)

Brinell hardness

number, HB(N/mm2)

Tensile strength of the

material (MPa)

Stainless steel 5.40 19.34

Copper 4.26 6.76

DISCUSSION :

i. A 10mm diameter Brinell hardness indenter produced an indentation 2.50mm diameterin a steel alloy when a load of 1000kg was used. Computer the HB of this material.

HB = 2(1000 x 10N)

(3.142)(10mm)[10mm (10mm2 2.5mm2)1/2]= 20000N / 9.977

= 2004.58 N/mm2

ii. What will be the diameter of an indentation to yield a hardness of 300 HB when 500kgload is used?

300 HB = 2(500x10N)

(10)[10mm (102 d

2)

1/2]

300 = 10000

10 [10 (10 d)]

300 = 10000

100 10 (10 d)

300 = 10000

100 100 + 10d

300 = 10000

10d

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10 d = 10000300

d = 33.33

10(3.142)

d = 10.47mm

CONCLUSION :

REFERENCE :