TY - JOUR
T1 - Unifying acoustic emission and digital imaging observations of quasi-brittle fracture
AU - Lin, Qing
AU - Wan, Bin
AU - Wang, Yan
AU - Lu, Y.
AU - Labuz, Joseph F.
N1 - Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/10
Y1 - 2019/10
N2 - Acoustic emission (AE) and digital image correlation (DIC) were used to characterize the fracture process zone (FPZ) in Berea sandstone, a quasi-brittle material with a maximum grain size of 1 mm. The complimentary techniques of AE and DIC provide information on (i) damage throughout the volume, including AE locations and relative energy, and (ii) detailed DIC measurements of opening displacements associated with the FPZ. Three types of specimens were tested by three-point bending: center notch, smooth boundary, and large radius center notch. Experimental results indicate the following: (1) The length of FPZ is about 10 times longer than the maximum grain size. (2) The evaluation of energy based on the two different measurements, AE and DIC, is consistent with a linear softening law for the FPZ. (3) The fracture energy is estimated to be 120–140 J/m2, about seven times greater than the fracture energy based on linear fracture mechanics.
AB - Acoustic emission (AE) and digital image correlation (DIC) were used to characterize the fracture process zone (FPZ) in Berea sandstone, a quasi-brittle material with a maximum grain size of 1 mm. The complimentary techniques of AE and DIC provide information on (i) damage throughout the volume, including AE locations and relative energy, and (ii) detailed DIC measurements of opening displacements associated with the FPZ. Three types of specimens were tested by three-point bending: center notch, smooth boundary, and large radius center notch. Experimental results indicate the following: (1) The length of FPZ is about 10 times longer than the maximum grain size. (2) The evaluation of energy based on the two different measurements, AE and DIC, is consistent with a linear softening law for the FPZ. (3) The fracture energy is estimated to be 120–140 J/m2, about seven times greater than the fracture energy based on linear fracture mechanics.
KW - AE energy
KW - Acoustic emission (AE)
KW - Digital image correlation (DIC)
KW - Fracture energy
KW - Fracture process zone (FPZ)
KW - Softening law
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U2 - 10.1016/j.tafmec.2019.102301
DO - 10.1016/j.tafmec.2019.102301
M3 - Article
AN - SCOPUS:85069579873
SN - 0167-8442
VL - 103
JO - Theoretical and Applied Fracture Mechanics
JF - Theoretical and Applied Fracture Mechanics
M1 - 102301
ER -