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The primary difference between the Charpy and Izod techniques lies in the manner of specimen support.
True
The Charpy V-notch (CVN) technique is most commonly used in Europe.
False
The energy absorption in the impact-testing apparatus is computed from the difference between h and h̀.
True
The ductile-to-brittle transition is related to the temperature dependence of the measured impact energy absorption.
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The temperature of the specimen has no influence on the test result and the fracture mode.
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At higher temperatures, the CVN energy is relatively small, in correlation with a brittle mode of fracture.
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The ductile to brittle transition temperature (DBTT) depends only on the material composition.
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As the temperature is lowered, the impact energy increases and the nature of fracture mode changes from brittle to ductile fracture surface.
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For brittle fracture, the surface appears dull and fibrous.
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The appearance of fracture surface is not an indication for the nature of fracture and used in transition temperature determination.
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The impact test measures the energy absorbed in breaking the specimen under shock loading or at high loading rates.
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The impact energy value indicates the brittleness of the material under test.
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The Charpy and Izod tests measure the impact energy or impact toughness of materials.
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The specimen for both Charpy and Izod tests is in the shape of a cylinder.
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The impact test conditions can be chosen to represent those most severe relative to the potential for ductile deformation.
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One of the factors in impact test conditions is the triaxial stress state, which may be introduced by the presence of a notch.
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