Sound Emission

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Sound emission

Definition

Sound emissions always occur in solids when certain material stresses are exceeded and elastic energy is released in the form of mechanical stress waves.

They can be caused by both microscopic and macroscopic processes. The emissions can be caused by various source mechanisms:

• Plastic deformations
• Crack formation, crack propagation, and fracture processes
• Friction processes in a crack
• Phase transformation processes

Frequency range for sound emission testing

In sound emission analysis, the occurrence of sound emissions is used to obtain in-depth information, e.g., on interface properties in fibre-reinforced plastics.

See also

• Acoustic emission
• Sound emission experimental conditions
• Sound emission analysis
• Sound emission testing
• Sound velocity
• Ultrasonic birefringence
• Ultrasonic sensors

Reference

• Bardenheier, R.: Schallemissionsuntersuchungen an polymeren Verbundwerkstoffen. Part I: Das Schallemissionsverfahren als quasi-zerstörungsfreie Werkstoffprüfung. Z. Werkstofftechnik 11 (1980) pp. 41–46