Naslov
A Strain Gradient Approach for Modeling of Quasi-Brittle Damage Responses

Autori
Putar, Filip ; Sorić, Jurica ; Lesičar, Tomislav ; Tonković, Zdenko

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
CFRAC 2017 International Conference on Computational Fracture and Failure of Materials and Structures BOOK OF ABSTRACTS / Moes, Nicolas ; Olivier, Xavier ; Jirasek, Milan ; Allix, Olivier - Nantes : Ecole Centrale de Nantes, 2017, 74-74

Skup
Fifth International Conference on Computational Fracture and Failure of Materials and Structures

Mjesto i datum
Nantes, Francuska, 14.06.2017. - 16.06.2017

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Quasi-Brittle Damage ; C1 Continuity Finite Element ; Strain Gradient Theory ; Heterogeneous Material

Sažetak
An efficient damage model for quasi-brittle materials implemented into the two dimensional C1 continuity triangular finite element formulation [1] employing the nonlocal continuum theory is proposed. In this way, a nonlocal material behaviour is introduced in the model, enabling the preservation of the positive definiteness of the stiffness matrices, as well as the ellipticity of the damage related field equations in the softening regime. The isotropic damage law is introduced into the higher-order stress-strain constitutive relations, which enable the analysis of both homogeneous and heterogeneous materials. Such softening formulation also ensures a decrease of the nonlocality associated with the damage growth, which is necessary for the correct description of the narrow localized deformation [2]. Because the linear elastic material behaviour is considered, the constitutive tensors can be calculated only once, prior to the softening analysis by applying the second-order homogenization procedure at the appropriate microstructural representative volume element, as described in [1]. All algorithms derived are implemented into the FE software ABAQUS in order to achieve higher computational efficiency. The robustness and accuracy of the computational algorithms derived are shown in numerical examples. The numerical results are compared with the solutions obtained by other available nonlocal formulations [2, 3].

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

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