Ultrasonic Wave Propagation Simulation in Concrete Using Explicit Dynamic Finite Element Method

摘要

Time domain simulation of ultrasonic wave propagation through highly inhomogeneous media such as concrete was studied using the explicit dynamic finite element method (EDFEM). In this study, a concrete slab was modeled as a five-phase 2-D model composed of cement paste, aggregates, steel reinforcing bar, aluminum pipe and air voids. The model considers the ultrasonic wave scattering from different inclusions in concrete and compared with actual experimental data. The explicit method is especially well-suited for solving high-speed dynamic events that require many small increments to obtain a high-resolution solution. The most striking feature of the explicit method is the absence of a global tangent stiffness matrix, which is required with implicit methods. Since the state of the model is advanced explicitly, iterations and tolerances are not required.