Theoretical Analysis of Mechanical Load Induced Micro-crack Generation in Concruction Materials

Theoretical Analysis of Mechanical Load Induced Micro-crack Generation in Concruction Materials

Paper in proceedings (conference paper)

If a solid is loaded by a kind of mechanical stress (compression, tensile stress, bending, mechanical shocks, shearing, notching, material fibre breakage etc.), cracks are generated in it which in turn results in a non-uniform distribution of the electric charge over the crack walls, which are getting charged by opposite sign charges. In consequence of the charge oscillatory motion corresponding to the acoustic emission (AE) taking place simultaneously with the crack generation, a time-varying electric dipole is formed. In this way, the cracks make up the source of an electromagnetic field, which can be detected in both the material neighbourhood and, in some cases, a remote region.

If a solid is loaded by a kind of mechanical stress (compression, tensile stress, bending, mechanical shocks, shearing, notching, material fibre breakage etc.), cracks are generated in it which in turn results in a non-uniform distribution of the electric charge over the crack walls, which are getting charged by opposite sign charges. In consequence of the charge oscillatory motion corresponding to the acoustic emission (AE) taking place simultaneously with the crack generation, a time-varying electric dipole is formed. In this way, the cracks make up the source of an electromagnetic field, which can be detected in both the material neighbourhood and, in some cases, a remote region.

Micro-crack, mechanical stress, electromagnetic emission, acoustic emission

ŠTEFKOVÁ, M.; KOKTAVÝ, P.

01.01.2005

České vysoké učení technické v Brně

Praha

80-01-03290-6

Proocedings of International Workshop Physical and Material Engineering 2005

205

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