Sheng-Wei Chi, Department of Civil and Materials Engineering, UIC Primary Grant Support: UIC
Problem Statement and Motivation
Progressive penetration processes and predicted damage and contact surfaces
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Increasing demands are placed on materials and structures to withstand complex phenomena due to extreme loads such as impact and penetration.
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Key issues needed to be addressed in penetration simulation include high strain rate, extreme large deformation, material fracture, and fragment impact.
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The study aims to develop a multiscale meshfree approach for modeling fragment penetration into concrete.
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The ultimate goal is to understand better the phenomena in the penetration process and to predict the structure response under extreme loads.
Comparison of experimental and numerical damage patterns
Key Achievements and Future Goals
Technical Approach • • • •
Semi-Lagrangian Reproducing Kernel Particle formulation in which the point discretization follows the material while the radius of interaction of a point is fixed in Euler coordinates. Levelset enhanced kernel contact algorithm Image-based meso-scale concrete fracture simulation Microstructure informed damage model Meshfree discretization
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Schematic of image-based meso-scale concrete fracture simulation
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Develop a levelset enhanced kernel contact algorithm that does not require a predefined contact surface.
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Develop an image-based computational approach to effectively construct a computer model based on cross sectional images.
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Develop a concrete constitutive model based on the damage evolution in the meso-scale via the energy bridge theory.
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The future Goal of this study is to take into consideration multi-physics phenomena in penetration simulations, including: • • •
Thermo effects Rate effects on concrete and projectiles Shock wave