Numerical Parametric Study of Coda Wave Interferometry Sensitivity to Microcrack Change in a Multiple Scattering...

Area of Science:

• Materials Science
• Structural Engineering
• Geophysics

Background:

• Crack propagation in 3D printed concrete threatens structural integrity.
• Monitoring microcrack development is crucial for preventing failure.
• The behavior of ultrasonic coda waves during crack growth requires further clarification.

Purpose of the Study:

• To numerically investigate the sensitivity and feasibility of Coda Wave Interferometry (CWI) for monitoring microcrack growth in heterogeneous materials.
• To quantitatively analyze the evolution pattern of ultrasonic coda waves in response to crack propagation.
• To establish functional relationships between CWI parameters and crack characteristics.

Main Methods:

• Development of a two-phase concrete model with microcracks of varying angles and lengths using ABAQUS finite element analysis software.
• Quantitative analysis of relative velocity change (Δv/v) and decorrelation coefficient (Kd) at different crack increments.
• Establishing functional relationships between CWI observations (Kd, Δv/v) and crack parameters (angle, relative length).

Main Results:

• Coda waves demonstrate sensitivity to both microcrack length and angle.
• Relative velocity change (Δv/v) exhibits a linear increase with microcrack length.
• Decorrelation coefficient (Kd) shows a quadratic relationship with crack length.
• Quantitative relationships between CWI parameters and crack characteristics were established.
• A sinusoidal function accurately fits the nonlinear relationship between slope and crack angle.

Conclusions:

• The study quantitatively assesses coda wave variation patterns during crack propagation in 3D printed concrete.
• Established relationships provide a basis for applying CWI in structural health monitoring of concrete materials.
• Findings are significant for the promotion and application of CWI technology in detecting and monitoring crack growth.