Browse ORBilu by Open Access
- What it is and what it isn't
- Green Road / Gold Road?
- Ready to Publish. Now What?
- How can I support the OA movement?
- Where can I learn more?
ORBilu is a project developed by
   Computational chemo-thermo-mechanical coupling phase-field model for complex fracture induced by early-age shrinkage and hydration heat in cement-based materialsNguyen, Thanh Tung  ; Waldmann, Danièle ; in Computer Methods in Applied Mechanics and Engineering (2019), 348 In this paper, we present a new multi-physics computational framework that enables us to capture and investigate complex fracture behavior in cement-based materials at early-age. The present model ... [more ▼] In this paper, we present a new multi-physics computational framework that enables us to capture and investigate complex fracture behavior in cement-based materials at early-age. The present model consists of coupling the most important chemo-thermo-mechanical processes to describe temperature evolution, variation of hydration degree, and mechanical behavior. The changes of material properties are expressed as a function of the hydration degree, to capture the age effects. Fracture analysis of these processes are then accommodated by a versatile phase field model in the framework of smeared crack models, addressing the influence of cracks on hydration and thermal transfer. We additionally describe a stable and robust numerical algorithm, which aims to solve coupled problems by using a staggered scheme. The developed approach is applied to study the fracture phenomena at both macroscopic and mesoscopic scales, in which all microstructural heterogeneities of sand and cement matrix are explicitly accounted. Nucleation, initiation, and propagation of complex crack network are simulated in an efficient way demonstrating the potential of the proposed approach to assess the early-age defects in concrete structures and materials. [less ▲] Detailed reference viewed: 232 (29 UL)Role of interfacial transition zone in phase field modeling of fracture in layered heterogeneous structuresNguyen, Thanh Tung ; Waldmann, Danièle ; in Journal of Computational Physics (2019), 386 Mechanical behavior of layered materials and structures greatly depends on the mechanical behavior of interfaces. In the past decades, the failure in such layered media has been studied by many ... [more ▼] Mechanical behavior of layered materials and structures greatly depends on the mechanical behavior of interfaces. In the past decades, the failure in such layered media has been studied by many researchers due to their critical role in the mechanics and physics of solids. This study aims at investigating crack-interface interaction in two-dimensional (2-D) and three-dimensional (3-D) layered media by a phase field model. Our objectives are fourfold: (a) to better understand fracture behavior in layered heterogeneous systems under quasi-static load; (b) to introduce a new methodology for better describing interfaces by a regularized interfacial transition zone in the context of varia-tional phase field approach, exploring its important role; (c) to show the accuracy , performance and applicability of the present model in modeling material failure at the interfaces in both 2-D and 3-D bodies; and (d) to quantitatively validate computed crack path with respect to experimental data. Phase field models with both perfectly and cohesive bonded interfaces are thus derived. A regularized interfacial transition zone is introduced to capture characteristics of material mismatch at the interfaces. Numerical examples for 2-D and 3-D layered systems with experimental validation provide fundamentals of fracture behavior in layered structures. The obtained results shed light on the behavior of crack paths, which are drastically affected by the elastic modulus mismatch between two layers and interface types, and reveal the important role of the proposed interfacial transition zone in phase field modeling of crack interface interactions. [less ▲] Detailed reference viewed: 210 (24 UL) Phase field simulation of early-age fracture in cement-based materialsNguyen, Thanh Tung ; Waldmann, Danièle ; E-print/Working paper (2018) Detailed reference viewed: 104 (14 UL)Structural shape optimization by IGABEM and particle swarm optimization algorithm; ; Nguyen, Thanh Tung et alin Engineering Analysis with Boundary Elements (2018), 88 Detailed reference viewed: 99 (0 UL)Multi-inclusions modeling by adaptive XIGA based on LR B-splines and multiple level sets; ; et al in Finite Elements in Analysis and Design (2018), 148 Detailed reference viewed: 81 (0 UL)Adaptive multi-patch isogeometric analysis based on locally refined B-splines; ; et al in Computer Methods in Applied Mechanics and Engineering (2018), 339 Detailed reference viewed: 81 (1 UL) |
||
