A New Damage Identification Method for a Penetrated Crack Using Visualized Ultrasonic Wave Propagation and Topology Optimization

2019 ◽  
Vol 2019 (0) ◽  
pp. OS1201
Author(s):  
Kazuki RYUZONO ◽  
Shigeki YASHIRO ◽  
Hiroto NAGAI
Keyword(s):  
Wave Propagation ◽  
Topology Optimization ◽  
Ultrasonic Wave ◽  
Damage Identification ◽  
Ultrasonic Wave Propagation ◽  
Identification Method ◽  
And Topology

scholarly journals Topology Optimization-Based Damage Identification Using Visualized Ultrasonic Wave Propagation

Materials ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 33 ◽  
Author(s):  
Kazuki Ryuzono ◽  
Shigeki Yashiro ◽  
Hiroto Nagai ◽  
Nobuyuki Toyama
Keyword(s):  
Wave Propagation ◽  
Topology Optimization ◽  
Objective Function ◽  
Young’S Modulus ◽  
Ultrasonic Wave ◽  
Damage Identification ◽  
Young's Modulus ◽  
Maximum Amplitude ◽  
Actual State ◽  
Ultrasonic Wave Propagation

This study proposes a new damage identification method based on topology optimization, combined with visualized ultrasonic wave propagation. Although a moving diagram of traveling waves aids in damage detection, it is difficult to acquire quantitative information about the damage, for which topology optimization is suitable. In this approach, a damage parameter, varying Young’s modulus, represents the state of the damage in a finite element model. The feature of ultrasonic wave propagation (e.g., the maximum amplitude map in this study) is inversely reproduced in the model by optimizing the distribution of the damage parameters. The actual state of the damage was successfully estimated with high accuracy in numerical examples. The sensitivity of the objective function, as well as the appropriate penalization exponent for Young’s modulus, was discussed. Moreover, the proposed method was applied to experimentally measured wave propagation in an aluminum plate with an artificial crack, and the estimated damage state and the sensitivity of the objective function had the same tendency as the numerical example. These results demonstrate the feasibility of the proposed method.

Simulation study of axial ultrasonic wave propagation in heterogeneous bovine cortical bone

2016 ◽  
Vol 140 (5) ◽  
pp. 3710-3717 ◽  
Author(s):  
Toshiho Hata ◽  
Yoshiki Nagatani ◽  
Koki Takano ◽  
Mami Matsukawa
Keyword(s):  
Wave Propagation ◽  
Cortical Bone ◽  
Ultrasonic Wave ◽  
Simulation Study ◽  
Ultrasonic Wave Propagation
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