报告题目：On resolving fractures in additively manufactured composites using the SBFEM
报告人：Savvas Triantafyllou副教授（雅典国家技术大学）
报告时间：2024年11月22日（星期五）14:00-15:30
报告地点：乐学楼1116会议室
主办单位：力学与工程科学学院动力学与控制研究所
欢迎广大师生参加！报告简介：
Additively manufactured fiber-reinforced components (FRC) rapidly gain traction in the European aerospace and transport industry. This is attributed to their well-established benefits, including reduced machine, material, and labor costs, minimized manufacturing waste, and the utilization of more efficient materials. Despite these advantages, a notable drawback of additively manufactured components lies in their intricate and often tessellated geometry. This complexity gives rise to combined damage mechanisms, such as fiber pull-outs and matrix cracking, deviating from the conventional paradigm of high strength and ductile metal. To address this challenge, the phase-field method emerges as a robust approach for damage modeling, offering capabilities to accurately resolve the initiation, propagation, branching, and merging of complex curvilinear crack topologies.
In this session, we revisit the cohesive phase-field model for isotropic domains and extend it to resolve intra-laminar damage response in 3D printed fibre reinforced composites. The damage model incorporates a linear crack-surface density functional, exhibiting pure-elastic behavior until damage onset, and a quasi-quadratic degradation function which can be used to calibrate experimental strain softening curves, thereby accurately predicting quasi-brittle damage response in FRC. The nonlinear phase-field evolution equation is solved using a staggered solution scheme, and an Augmented Lagrange method is incorporated to facilitate the irreversible evolution of the damage phase-field variable.
报告人简介：
Dr. Savvas Triantafyllou is an Associate Professor in Structural Engineering at the School of Civil Engineering, National Technical University of Athens (NTUA). Prior to NTUA he was an Associate Professor at the Faculty of Engineering, University of Nottingham, UK. He obtained the degree of Meng in Civil Engineering from NTUA and his PhD on Computational Methods from the same University. His research interests are on the broad area of engineering mechanics with a particular emphasis on the development of advanced numerical methods to resolve damage evolution in composite and in general heterogenous domains. He has been the PI on over €1.5M of funding in the past five years.
