TY - JOUR
T1 - Model-driven fatigue crack characterization and growth prediction: A two-step, 3-D fatigue damage modeling framework for structural health monitoring
AU - Xu, Lei
AU - Wang, Kai
AU - Yang, Xiongbin
AU - Su, Yiyin
AU - Yang, Jianwei
AU - Liao, Yaozhong
AU - Zhou, Pengyu
AU - Su, Zhongqing
N1 - Funding Information:
The work was supported by a General Project (No. 51875492) and a Key Project (No. 51635008) received from the National Natural Science Foundation of China. Z Su acknowledges the support from the Hong Kong Research Grants Council via General Research Funds (Nos. 15202820, 15204419 and 15212417).
Publisher Copyright:
© 2020
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2021/4/1
Y1 - 2021/4/1
N2 - Prevailing fatigue damage evaluation approaches that make use of the acoustic nonlinearity of guided ultrasonic waves (GUWs) are sustained by simplified models, most of which depict three-dimensional (3-D) fatigue damage in a two-dimensional (2-D) domain [1]. Such approximation risks the evaluation accuracy. With such motivation, this study aspires to a new, two-step modeling framework, aimed at accurately characterizing and continuously monitoring fatigue damage, from its embryonic initiation, through progressive growth to formation of macroscopic crack. In the first step, a 3-D, analytical model based on the theory of elastodynamics sheds light on the generation of contact acoustic nonlinearity in GUWs under the modulation of `breathing' behavior of a non-penetrating fatigue crack, on which basis a crack-area-dependent nonlinear damage index is yielded. In the second step, a 3-D fatigue crack growth model predicts the continuous growth of the identified fatigue crack in the length and depth along crack front. The framework is validated using numerical simulation, followed with experiment, in both of which the initiation and progressive growth of a real corner fatigue crack is monitored, with continuous prediction of the crack growth in length and depth. Results have demonstrated the accuracy and precision of the developed modeling framework for characterizing embryonic fatigue damage.
AB - Prevailing fatigue damage evaluation approaches that make use of the acoustic nonlinearity of guided ultrasonic waves (GUWs) are sustained by simplified models, most of which depict three-dimensional (3-D) fatigue damage in a two-dimensional (2-D) domain [1]. Such approximation risks the evaluation accuracy. With such motivation, this study aspires to a new, two-step modeling framework, aimed at accurately characterizing and continuously monitoring fatigue damage, from its embryonic initiation, through progressive growth to formation of macroscopic crack. In the first step, a 3-D, analytical model based on the theory of elastodynamics sheds light on the generation of contact acoustic nonlinearity in GUWs under the modulation of `breathing' behavior of a non-penetrating fatigue crack, on which basis a crack-area-dependent nonlinear damage index is yielded. In the second step, a 3-D fatigue crack growth model predicts the continuous growth of the identified fatigue crack in the length and depth along crack front. The framework is validated using numerical simulation, followed with experiment, in both of which the initiation and progressive growth of a real corner fatigue crack is monitored, with continuous prediction of the crack growth in length and depth. Results have demonstrated the accuracy and precision of the developed modeling framework for characterizing embryonic fatigue damage.
KW - Contact acoustic nonlinearity
KW - Crack growth
KW - Fatigue crack
KW - Non-penetrating crack
KW - Structural health monitoring
UR - http://www.scopus.com/inward/record.url?scp=85098465008&partnerID=8YFLogxK
U2 - 10.1016/j.ijmecsci.2020.106226
DO - 10.1016/j.ijmecsci.2020.106226
M3 - Journal article
AN - SCOPUS:85098465008
SN - 0020-7403
VL - 195
JO - International Journal of Mechanical Sciences
JF - International Journal of Mechanical Sciences
M1 - 106226
ER -