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Erfassung der Rißbildung in Werkstoffen durch Ausnutzung der elektrischen Emission

Detection of crack formation in materials by using the electric emission
: Fraunhofer-Institut für Kurzzeitdynamik, Ernst-Mach-Institut -EMI-, Freiburg/Brsg.

Freiburg/Brsg., 1991, 19 S. : Abb.,Lit.
EMI-Berichte, 8/91
Fraunhofer EMI ()
crack formation; crack propagation; electrical emission; elektrische Emission; material test; Materialuntersuchung; Rißausbreitung; Rißentstehung

A novel technique for detecting crack formation and propagation in metallic and nonmetallic materials, based upon electric emission, is described. It is shown that a correlation between electric emission and fracture exists for glass, steel and concretes. The superiority of the electric emission gauges when compared to other methods lies in the fact that a direct contact between the tested materials and the gauge is not required. Furthermore, the gauges are not destroyed by the fracture event and are, therefore, reusable so that multiple successive crack initiation and growth can be detected. Also, it is demonstrated that this technique is applicable to measurement of crack formation in other nonmetallic and even in conducting materials.