Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/138662
Title: LOCALIZING GRADIENT DAMAGE MODELS FOR THE FRACTURE OF QUASI-BRITTLE MATERIALS
Authors: SUN GANG
Keywords: Gradient enhancement, Damage mechanics, Quasi-brittle materials, Fracture
Issue Date: 7-Jul-2017
Citation: SUN GANG (2017-07-07). LOCALIZING GRADIENT DAMAGE MODELS FOR THE FRACTURE OF QUASI-BRITTLE MATERIALS. ScholarBank@NUS Repository.
Abstract: This thesis focuses on the development of an improved gradient enhancement that fully regularizes the strain softening behavior of continuum damage models, i.e. a mesh independent structural response, with the development of localized damage profiles resembling macroscopic cracks at failure. The overall strategy is to first consider an idealized problem, where a higher-order microforce balance governing the damage process is recovered through a novel homogenization framework. Motivated by the insights obtained from the micromechanical analysis, a localizing gradient enhancement is developed from the generalized micromorphic framework, which is shown to avoid the anomalies associated with the conventional nonlocal approach. Finally, an isotropic damage model incorporating a newly proposed equivalent strain measure, regularized with the localizing gradient enhancement, is adopted for the mixed-mode fracture of concrete。
URI: http://scholarbank.nus.edu.sg/handle/10635/138662
Appears in Collections:Ph.D Theses (Open)

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