Strain-rate dependence of acoustic-emission power and spectra in aluminum alloys
1976; American Institute of Physics; Volume: 47; Issue: 9 Linguagem: Inglês
10.1063/1.323250
ISSN1520-8850
Autores Tópico(s)Fatigue and fracture mechanics
ResumoStrain-rate dependence of acoustic-emission power and spectra for deformation of aluminum alloys is investigated over a wide frequency range of 100 kHz to 4 MHz. In case of Al-Cu-Mg alloy (2024) and pure aluminum (1100), it is found that acoustic-emission power is proportional to the first power of the plastic strain rate times the gauge length of the specimen. Normalized acoustic-emission power spectra show no significant change at a given strain depending on the strain rate, though they vary with the strain in early stages of deformation. In case of Al-Mg alloy (5056), repeated bursts of acoustic emission are recorded accompanied by repeated discontinuous yielding. The mode of inhomogeneous deformation and the pattern of acoustic emission vary with the strain rate.
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