Abstract
An experimental study of degradation mechanisms and patterning in brittle materials is reported. Specimens of a cast-in brittle material were subjected to external mechanical load. At various pre-peak load levels, through transmission ultrasonic measurements were taken at several locations of the sample. The damage evolution and its patterning were studied through analysis of the attenuation of the transmitted wave. For monotonically increasing load significant attenuation was observed at low load levels, while for unloading the attenuation changes were relatively small. The test results indicate random and non-symmetric distribution of attenuation within the sample. However, in general, higher attenuation was observed close to the load-free surfaces than in the interior of the sample. This observation signifies the so-called skin effect. Occasionally, at a few locations of various samples the energy of the received wave increased with increasing external load. This may indicate unloading of partially formed cracks. Measured surface strains are compared to the overall ones and the degradation patterning within the samples. The ultrasonic measurements are examined with respect to estimating the internal material length. The relation between ultrasonic wave attenuation and mechanical dissipated energy is examined.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 347-369 |
| Number of pages | 23 |
| Journal | Engineering Fracture Mechanics |
| Volume | 42 |
| Issue number | 2 |
| DOIs | |
| State | Published - 1992 |
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ASJC Scopus subject areas
- Mechanical Engineering
- Mechanics of Materials
Cite this
Degradation mechanisms in brittle materials investigated by ultrasonic scanning. / Frantziskonis, George N; Desai, C. S.; Tang, F. F.; Daniewicz, D.
In: Engineering Fracture Mechanics, Vol. 42, No. 2, 1992, p. 347-369.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Degradation mechanisms in brittle materials investigated by ultrasonic scanning
AU - Frantziskonis, George N
AU - Desai, C. S.
AU - Tang, F. F.
AU - Daniewicz, D.
PY - 1992
Y1 - 1992
N2 - An experimental study of degradation mechanisms and patterning in brittle materials is reported. Specimens of a cast-in brittle material were subjected to external mechanical load. At various pre-peak load levels, through transmission ultrasonic measurements were taken at several locations of the sample. The damage evolution and its patterning were studied through analysis of the attenuation of the transmitted wave. For monotonically increasing load significant attenuation was observed at low load levels, while for unloading the attenuation changes were relatively small. The test results indicate random and non-symmetric distribution of attenuation within the sample. However, in general, higher attenuation was observed close to the load-free surfaces than in the interior of the sample. This observation signifies the so-called skin effect. Occasionally, at a few locations of various samples the energy of the received wave increased with increasing external load. This may indicate unloading of partially formed cracks. Measured surface strains are compared to the overall ones and the degradation patterning within the samples. The ultrasonic measurements are examined with respect to estimating the internal material length. The relation between ultrasonic wave attenuation and mechanical dissipated energy is examined.
AB - An experimental study of degradation mechanisms and patterning in brittle materials is reported. Specimens of a cast-in brittle material were subjected to external mechanical load. At various pre-peak load levels, through transmission ultrasonic measurements were taken at several locations of the sample. The damage evolution and its patterning were studied through analysis of the attenuation of the transmitted wave. For monotonically increasing load significant attenuation was observed at low load levels, while for unloading the attenuation changes were relatively small. The test results indicate random and non-symmetric distribution of attenuation within the sample. However, in general, higher attenuation was observed close to the load-free surfaces than in the interior of the sample. This observation signifies the so-called skin effect. Occasionally, at a few locations of various samples the energy of the received wave increased with increasing external load. This may indicate unloading of partially formed cracks. Measured surface strains are compared to the overall ones and the degradation patterning within the samples. The ultrasonic measurements are examined with respect to estimating the internal material length. The relation between ultrasonic wave attenuation and mechanical dissipated energy is examined.
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U2 - 10.1016/0013-7944(92)90225-4
DO - 10.1016/0013-7944(92)90225-4
M3 - Article
AN - SCOPUS:0026867478
VL - 42
SP - 347
EP - 369
JO - Engineering Fracture Mechanics
JF - Engineering Fracture Mechanics
SN - 0013-7944
IS - 2
ER -