@Article{cmc.2014.040.001,
AUTHOR = {Y. L.  Liu, N.  Hu, H.  Xu, H.  Ning, L. K.  Wu},
TITLE = {A Real-time Monitoring Technique for Local Plasticity in Metals Based on Lamb Waves and a Directional Actuator/Sensor Set},
JOURNAL = {Computers, Materials \& Continua},
VOLUME = {40},
YEAR = {2014},
NUMBER = {1},
PAGES = {1--20},
URL = {http://www.techscience.com/cmc/v40n1/22730},
ISSN = {1546-2226},
ABSTRACT = {A real-time monitoring technique for local plasticity using Lamb waves was developed. Tensile test of a thin aluminum plate with a circular hole where high stress concentration was induced was conducted to verify this technique. During the tensile test, a series of wave signals passing through the local plastic region were collected using a directional actuator/sensor set to monitor plasticity evolution. A pulse compression technique was used to process the wave signals. With the increase of tensile stress in the specimen, the amplitude changes of S<sub>0</sub> and A<sub>0</sub> modes were obtained and the difference of Lamb wave signals was further evaluated using a proposed signal index <i>I</i> calculated by wavelet analysis. Combined with the numerical stress analysis of the tensile specimen, the influence of the plasticity on the amplitudes of S<sub>0</sub> and A<sub>0</sub> wave modes was analyzed. As the plastic zone grows gradually, the wave amplitudes and <i>I</i> of S<sub>0</sub> and A<sub>0</sub> wave modes show their different change tendencies compared with those in elastic stage. The amplitude change is more sensitive to mild plasticity than that of <i>I</i>, while the change of <i>I</i> caused by severe plasticity is more obvious than the amplitude change.},
DOI = {10.3970/cmc.2014.040.001}
}