Fractography

fractography

[‚frak′täg·rə·fē] (metallurgy) The microscopic examination of fractured metal surfaces.

Fractography

the description of fractured metal surfaces in order to analyze the causes and process of fracture. Fracto-graphic examination may be performed by the unaided eye or with the use of a magnifier, optical microscope, or electron microscope. Transmission electron microscopes are used to examine a replica of the fracture surface, whose contrast is reinforced by shadowing, that is, by depositing a layer of metal on it, rather than the fracture itself. The fracture surface itself can be studied with a scanning electron microscope. The type of fracture encountered depends on the type of stress imposed (static, impact, or variable), the conditions under which stress is applied (such as the temperature and type of medium), the nature of crack extension (intragranular or intergranular fracture), and the degree of development of plastic deformation in failure (brittle or ductile fracture).

REFERENCE

Fridman, Ia. B. Mekhanicheskie svoistva metallov, 3rd ed., vol. 1. Moscow, 1974. Chapter 11.

单词	fractography
释义	fractography fractography (frækˈtɒɡrəfɪ) n (Civil Engineering) engineering the study of fractures or cracks in a material, esp metal, in order to predict or identify the cause of a failure in a structure Fractography fractography [‚frak′täg·rə·fē] (metallurgy) The microscopic examination of fractured metal surfaces. Fractography the description of fractured metal surfaces in order to analyze the causes and process of fracture. Fracto-graphic examination may be performed by the unaided eye or with the use of a magnifier, optical microscope, or electron microscope. Transmission electron microscopes are used to examine a replica of the fracture surface, whose contrast is reinforced by shadowing, that is, by depositing a layer of metal on it, rather than the fracture itself. The fracture surface itself can be studied with a scanning electron microscope. The type of fracture encountered depends on the type of stress imposed (static, impact, or variable), the conditions under which stress is applied (such as the temperature and type of medium), the nature of crack extension (intragranular or intergranular fracture), and the degree of development of plastic deformation in failure (brittle or ductile fracture). REFERENCE Fridman, Ia. B. Mekhanicheskie svoistva metallov, 3rd ed., vol. 1. Moscow, 1974. Chapter 11.
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