Finite Element and Discrete Element Approach to Concrete's Material Behavior at High Strain Rates

Research Paper (postgraduate) from the year 2018 in the subject Engineering - Civil Engineering, grade: 1.3, Dresden Technical University, course: Finite Element Method and Discrete Element Method, language: English, abstract: Can numerical simulations accurately predict the shattering forces unleashed during high-velocity impacts on concrete structures? This book delves into the heart of this question, offering a comparative analysis of two powerful computational methods: the Finite Element Method (FEM) and the Discrete Element Method (DEM). Focusing on the dynamic response of a Timoshenko plate with a circular opening subjected to extreme stress, the study meticulously examines the suitability of each method for modeling complex material behavior under high strain rates. Explore the intricacies of wave propagation and crack initiation within the concrete structure, as revealed through detailed simulations performed using ANSYS for FEM and a custom-built C++ code for DEM. Witness a side-by-side comparison of these methodologies, uncovering their respective strengths and limitations in capturing the nuances of concrete's response to impact loading. From the theoretical underpinnings of the wave equation and finite difference method (FDM) to the practical application of boundary conditions and meshing strategies, this book provides a comprehensive exploration of the tools and techniques employed in dynamic analysis. Uncover the secrets of transient structural analysis and explicit dynamics, gaining insights into the deformation, stress distribution, and overall structural integrity under intense pressure. Whether you're a student, researcher, or engineer working with concrete structures or numerical modeling, this book offers a valuable resource for understanding and applying FEM and DEM to solve real-world engineering challenges, particularly those involving high strain rates, impact dynamics, and structural integrity assessments. Discover how these methods compare in computational efficiency, accuracy, and their ability to predict failure mechanisms, ultimately guiding you in selecting the most appropriate approach for your specific application in concrete behavior analysis and beyond. This exploration bridges the gap between theoretical concepts and practical implementation, furnishing a robust understanding of the numerical methods essential for tackling complex engineering problems involving concrete and other materials under extreme conditions. Keywords: Finite Element Method (FEM), Discrete Element Method (DEM), high strain rates, concrete, Timoshenko plate, impact loading, wave propagation, crack propagation, ANSYS, C++, numerical simulation, dynamic analysis, stress, strain, deformation.