Title:
Phase-Field Cohesive Zone Crack Propagation Model for Hard-Soft Architected Materials
Author(s):
Aimane Najmeddine
Publication:
Web Session
Volume:
ws_F24_Najmeddine.pdf
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
11/3/2024
Abstract:
Additively manufactured cement-based materials can exhibit complex fracture behaviors such as crack deflection, penetration, and bridging, under various loading conditions, due to the presence of heterogeneities such as interfaces. This can lead to significantly different mechanical properties such as strength and toughness and overall performance at a large scale. A major challenge encountered in designing additively manufactured concrete materials is understanding the contribution of interfacial cohesion between a material's constituents to the overall mechanical properties and performance of the structure. In this presentation, we propose a constitutive framework based on fracture mechanics to better elucidate the role of the interfaces in capturing and engineering the fracture response of additively manufactured cement-based materials. This framework integrates the phase-field approach to fracture with a Cohesive Zone Model (CZM) to capture various fracture propagation mechanisms within the bulk and across layered material’s interfaces. It has been demonstrated that the framework can accurately predict a range of fracture dissipation phenomena in brittle layered hard-hard cement-based assemblies as well as hard-soft composites with interfaces. These mechanisms include crack deflection and penetration in hard-hard assemblies and crack bridging in hard-soft assemblies along with other toughening mechanisms (e.g., progressive layer failure), all of which are crucial to properly design resilient additively manufactured materials and structures at large scale.