Kamis, 21 Juli 2011

laporan prktikum

Laporan Praktikum Laboratorium Metrologi dan fluida
Pengujian Bahan

Charpy Impact


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Charpy Impact is a single point test that measures a materials resistance to impact from a swinging pendulum. Charpy impact is defined as the kinetic energy needed to initiate fracture and continue the fracture until the specimen is broken. The values obtained can be used for quality control or to differentiate general toughness.

Test Procedure:
The specimen is mounted horizontally and supported unclamped at both ends. The hammer is released and allowed to strike through the specimen. If breakage does not occur, a heavier hammer is used until failure occurs.

Specimen size:
Specimens are 80 x 10mm by thickness. The specimens can be either notched or unnotched.

Impact energy is expressed in joules. Impact strength is calculated by dividing impact energy in joules by the area under the notch. The higher the resulting number, the tougher the material. 

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