Dynamic propagation of a macrocrack interacting with parallel small cracks

Oterkus, Selda; Važić, Božo; Hanlin, Wang; Diyaroglu, Cagan; Öterkuş, Erkan

doi:10.3934/matersci.2017.1.118

Cited by 49 publications

(13 citation statements)

References 19 publications

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“…Brittle materials have advantages such as hardness and wear resistance, but their deficiencies in terms of toughness and brittleness significantly restrain their usage in practice. This is the main reason that the problem of crack propagation at both macro and micro levels is a problem of frequent discussion in the recent literature [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…The solutions belong to the problem of the interaction of intricate micro-crack patterns are not widely presented in the current literature [4]. One of the most recent studies on the effect of small cracks on the propagation of a macro-crack is presented in [3]. They provide a relation between various locations, density, and numbers of cracks and macro-crack propagation speed.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Crack Propagation and Its Interaction With Micro-Cracks in an Impact Problem

Candaş

Öterkuş

Irmak

2020

Journal of Engineering Materials and Technology

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Abstract The dynamic fracture behavior of brittle materials that contain micro-level cracks should be examined when material subjected to impact loading. We investigated the effect of micro-cracks on the propagation of macro-cracks that initiate from notch tips in the Kalthoff-Winkler experiment, a classical impact problem. To define pre-defined micro-cracks in three-dimensional space, we proposed a two-dimensional micro-crack plane definition in the bond-based Peridynamics (PD) that is a non-local form of classical continuum theory. Randomly distributed micro-cracks with different number densities in a constant area and number in expending area models were examined to monitor the toughening of the material. The velocities of macro-crack propagation and the time required for completing of fractures were considered in several pre-defined micro-cracks cases. It has been observed that toughening mechanism only initiated by exceeding a certain number of micro-cracks; therefore, there is a positive correlation between the density of pre-defined micro-cracks and macro-crack propagation rate and also, toughening mechanism.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic Crack Propagation and Its Interaction With Micro-Cracks in an Impact Problem

Candaş

Öterkuş

Irmak

2020

Journal of Engineering Materials and Technology

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“…Recently, Vazic et al [41] used the bond-based (BB) PD formulation to investigate the effect of the presence of parallel micro-cracks on dynamics of a main crack and their effects on the toughness enhancement of the poly methyl methacrylate (PMMA) material. According to their results, both positive and negative influence rate of micro-cracks are observed on the velocity of main-crack propagation and material toughness.…”

Section: Introductionmentioning

confidence: 99%

An ordinary state-based peridynamic model for toughness enhancement of brittle materials through drilling stop-holes

Rahimi

Kefal

Yıldız

et al. 2020

International Journal of Mechanical Sciences

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In this paper, the ordinary state-based peridynamic (OSB) is used to simulate and study the effects of different-shaped stop-holes with different combinations on crack dynamics in brittle materials in order to establish a detailed knowledge about the toughening effect of internal features that can be in the form of holes and pores. Using the OSB analyses, a new easy-toapply technique is introduced to toughen the materials against crack propagations. As a first case study, the high accuracy of peridynamic approach in damage prediction is demonstrated through solving a collection of numerical and experimental benchmark problems. Moreover, the bi-hole, parabolic, branched, bi-parabolic, and mixed-parabolic combinations of stopholes under tensile loading, and the T-shape, I-shape, bi-linear, linear, and linear-parabolic combinations of stop-holes under shear loading are suggested for notably enhancing material toughness and are practically and functionally compared with each other. Generally, the suggested geometries are proven to be highly effective on toughness enhancement of materials with a relative ease of implementation, in comparison to other internal features such as microcracks. In addition, a further case study is carried out on the effects of the distance of stopholes from the initial crack-tip on crack dynamics and material toughness, in which it is observed that every hole has a specific µ-range, and thus, the crack dynamics are affected by the hole if and only if the crack enters this range. Overall, the arrestment and accelerating effects of the stop-holes on crack dynamics are carefully explained numerically and conceptually, which will help engineers and designers to maximize the positive effects of stopholes on material toughness and design a tougher micro-structural material using easily applied defects.

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“…PD formulation allows to deal with complex crack interaction problems where multiple cracks of arbitrary shapes can be introduced in the structure, and tracking of the crack tip location and crack behaviour is not necessary. For this reason, original "bond-based" PD has been successfully applied to brittle fracture problems to predict crack nucleation and propagation [31][32][33][34] as well as the main crack interacting with micro-cracks [35,36]. However, the wide application of the "bond-based" PD [37] model has limitations in the specification of material properties since Poisson's ratio is constrained to 1/3 in the 2D models and 1/4 in the 3D models.…”

Section: Introductionmentioning

confidence: 99%

Influence of Different Types of Small-Size Defects on Propagation of Macro-cracks in Brittle Materials

Karpenko

Oterkus

Öterkuş

2020

J Peridyn Nonlocal Model

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The presence of defects in the structure requires noticeable attention and understanding of fracture mechanisms in brittle materials has to be established. Defects in the form of holes, macro-and micro-cracks are the main interest of this paper. This work investigates the dual role of holes and micro-crack arrays on toughening and degradation mechanisms in concrete structures. An ordinary state-based peridynamics (PD) model is utilized to analyse the fracture problem at the micro-level. The application of PD shows its advantage in crack-hole, macro-and micro-crack interaction problems since PD can accurately predict the contribution of defects on structural behaviour. The study of the three-point bending problem with five types of holes existing in the structure showed the crack arrest phenomena at the hole boundary and the "attraction" of the crack to propagate towards the hole. For the study of the macro-and micro-cracks interaction problem, various cases of the micro-crack distribution and inclination angles are considered and validated with analytical studies. The PD quasi-static simulations show good agreement with analytical solutions. Moreover, PD dynamic solutions show the capability of PD to capture complex crack propagation paths. It is observed that the presence of micro-cracks and holes ahead of the main crack can suppress its further propagation as well as have an influence on the crack propagation direction. The numerical results demonstrate the efficiency of the PD modelling of multiple crack interaction problems.

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Dynamic propagation of a macrocrack interacting with parallel small cracks

Cited by 49 publications

References 19 publications

Dynamic Crack Propagation and Its Interaction With Micro-Cracks in an Impact Problem

Dynamic Crack Propagation and Its Interaction With Micro-Cracks in an Impact Problem

An ordinary state-based peridynamic model for toughness enhancement of brittle materials through drilling stop-holes

Influence of Different Types of Small-Size Defects on Propagation of Macro-cracks in Brittle Materials

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