MetE 206 Exp7 - Middle East Technical University Department...

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Middle East Technical University Department of Metallurgical & Material Engineering MetE 206 Materials Laboratory Experiment 7 Charpy Impact Testing Lab Assistant Güher Kotan Tahir Mahmut Beydola 1394014
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Introduction In this experiment we observed the fracture of materials with different composition and temperature. Testing the specimens with appropriate Charpy testing machine shows us the material absorbs the impact energy also termed as notch toughness for different temperatures that gives us the ductile to brittle transition of the material. The test determines the fracture properties of materials. This test has wide usage because of its low cost. Ductile to brittle transition temperature was not known in World War II because of that many US ships sank in North Atlantic Ocean. Also Titanic sank because low temperature made the ship brittle like glass. Tensile test is used for determining the yield strength and the elongation until fracture of materials. Impact toughness affected by the notch size, impurities in the material. Also the temperature has a big effect on that. The temperature dependence is seen basely polymers, BCC materials like low-c steels. However ceramic, high strength alloys and FCC-HCP materials like non-ferrous, low strength metals have small temperature dependence.
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When inspecting the fracture surface of the specimens we can see the rough pattern for higher temperatures but below the room temperature we can observe shinier surface because of behaving like brittle material. Ductile Fracture
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This note was uploaded on 12/27/2011 for the course MATH 286 taught by Professor Adad during the Spring '11 term at Middle East Technical University.

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MetE 206 Exp7 - Middle East Technical University Department...

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