Iskanje po katalogu digitalne knjižnice

Opis: This doctoral thesis investigates cell-size-graded metallic and non-metallic Triply Periodic Minimal Surface (TPMS) structures' behavior under varying loading rates. Using experimental tests, analytical calculations, and advanced computer simulations, the research explores the interplay between material properties, cell size grading, and deformation mechanisms under different strain rates. The study focuses on enhancing the Direct Impact Hopkinson Bar (DIHB) setup for accurate force and displacement measurements and pioneering a method for quantifying inertial forces, critical at high strain rates. Key findings show that cell-size grading significantly affects deformation patterns, with initial deformation occurring in regions with smaller and lower stiffness cells across different loading rates and TPMS geometries. The research also highlights topology's influence on mechanical response, with photopolymer-based diamond structures showing superior energy absorption and gas-atomized steel structures favoring gyroid configurations. This underscores the importance of considering both topology and base material selection during TPMS design. The study demonstrates the increasing prominence of inertial forces as deformation rates rise, impacting structural response and failure likelihood in TPMS structures. These insights inform the design of optimized cellular metamaterials for high-performance applications requiring superior energy absorption and structural integrity under high loading rates. The research advances material characterization techniques and computational modelling capabilities, contributing to the development of next-generation cellular metamaterials for broader engineering applications.
Ključne besede: Triply Periodic Minimal Surfaces, TPMS, Cell-size-grading, Impact, High-strainrate, Digital Image Correlation
Objavljeno v DKUM: 17.10.2024; Ogledov: 0; Prenosov: 16
Celotno besedilo (46,48 MB)