Strain energy release rate in combination with reinforcement isotropic solid model (SERIS): A new mixed-mode I/II criterion to investigate fracture behavior of orthotropic materials

Khaji, Zahra; Fakoor, Mahdi

doi:10.1016/j.tafmec.2021.102962

Cited by 20 publications

(9 citation statements)

References 56 publications

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“…Currently, intensive research on various modifications of concretes is being carried out all over the world, e.g., with the use of: nanotechnology and nanomaterials [1][2][3], wastes [4][5][6], pozzolanic additives [7][8][9] and materials with special properties [10][11][12]. Such activities are mainly aimed at creating new composites, which would be the sustainable materials [13,14].…”

Section: Introductionmentioning

confidence: 99%

Rheology of Cement Pastes with Siliceous Fly Ash and the CSH Nano-Admixture

Szóstak

Golewski

2021

Materials

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The use of fly ash in cement composites adversely affects its mechanical properties during the first days of mixture curing. Modern technology, in the form of an admixture containing the hydrated calcium silicates, allows to accelerate the hardening and binding process of concrete. In this paper, studies on the influence of the admixture on properties of concretes with the ordinary Portland cements (OPC) containing the addition of siliceous fly ash (FA) have been carried out. As part of the experimental research, the authors conducted a series of studies for cement pastes modified with the addition of FA and the CSH nano-admixture (NA). In order to compare the mixtures, the following tests of cement pastes were carried out: the compressive and flexural strength, heat of hydration, SEM and rheological shrinkage. The mechanical parameters were tested after 4, 8, 12 and 24 h. The hydration heat test and microstructure analysis were carried out during the first 24 h of the concrete curing. All tests were carried out on the standard samples. On the basis of the heat of hydration test, much higher hydration heat was found in mixtures modified with the NA. During the shrinkage test, a positive effect of the NA was observed—the shrinkage during the first 28 days of mixture curing was lower than in the reference samples. The application of the CSH nano-admixture to cement pastes with the addition of FA has brought positive effects. Apart from a significant increase in strength in the first 24 h of mixture curing, a reduction in the rheological shrinkage was observed. The admixture can be successfully used in the ash concretes, in which a higher early strength is required.

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Section: Introductionmentioning

confidence: 99%

Rheology of Cement Pastes with Siliceous Fly Ash and the CSH Nano-Admixture

Szóstak

Golewski

2021

Materials

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“…Figure 1 shows molecular configuration IDIC structures and tiny acceptors developed their functionality is controlled by the materials they use. It is critical to investigate materials only at molecular scale [41]. In compared to Thiophene-N-substituted, the red shifting of the absorption maxima for phenyl-N-substituted were about 56 nm.…”

Section: Electronic Featuresmentioning

confidence: 99%

Theoretical Design of Efficient Small Molecules with sp2 Hybridized Nitrogen at Varying Positions for Organic Pull Push (ON/OFF) Solar Switches

Hassan

Sumrra

Mohyuddin³

et al. 2022

Preprint

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The efficacy of specific molecular acceptors in photovoltaic devices is determined by their chemical composition. Multiscale computations are required to protect investigation design and, as a result, efforts and money are saved. Using multiscale computer simulations, the influence of sp2-hybridized nitrogen substitutions at the interior or outer location of the internal center, carbonyl group, and terminating group of specific molecular acceptors is explored. The electronic behavior is studied using quantum molecular modeling. End-capping with nitrogen has greatly reduced the energy of electron rearrangement. The transfer integral plus excited state behavior shows a significant difference. Nitrogen alteration at the terminating group location, on the other hand, is an effective approach to boost electronic conductivity. The characteristics of the acceptor with their composites with 2,2'-((4-heptyl-4,9,9-trihexyl-4,9-dihydro-s-indaceno[1,2-b:5,6-b']dithiophene-2,7-diyl)bis(methanylylidene)bis(3-oxo-2,3-dihydro-1H-indene-1-yl-2-ylidene)dimalononitrile (IDIC) donor are also investigated using molecular dynamics. To investigate the mixing of specified specific molecular acceptors is determined. According to the radial distribution function, idic4 has a tighter packing alongside IDIC3 and IDIC4. Nitrogen modification at end capping has been discovered by all analyses.

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“…Fracture criteria for isotropic and orthotropic materials are classified into three categories based on energy, stress, and strain. To understand accurately the fracture behavior of orthotropic materials under mixed-mode I / II loading, new criteria based on the maximum tangential stress [36][37][38][39][40][41], minimum strain energy density [20,[42][43][44][45][46][47][48][49], and maximum strain energy release rate [50][51][52][53][54][55][56][57], maximum shear stress [58][59][60], and maximum tangential strain [61][62][63][64] criteria were presented.…”

Section: Introductionmentioning

confidence: 99%

“…There are different methods to analyze an isotropic Brazilian disc with angular cracks to estimate SIF's [81][82][83][84]. Center notched disk tension (CNDT) specimen is introduced for evaluating fracture behavior and employed for fracture tests [50,85,86]. In this specimen, crack is in the direction of the fibers and the direction of loading changes.…”

Section: Introductionmentioning

confidence: 99%

Presentation of a new wood test specimen to investigate the fracture behavior of orthotropic materials under mixed-mode I/II loading

Fakoor

Khali

2022

Preprint

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In this paper, a new test specimen as "Center Notched Disk Tension (CNDT)" to study mode I and II stress intensity factors (SIF’s) in orthotropic materials is presented. In the field of Fracture Mechanics, mode I and II SIF’s play an important role to describe the stress distribution. In CNDT specimens, for crack along the fibers, mode mixity is created by changing the loading direction. Also, by changing the crack-fibers direction for the desired crack-load, various mode mixity can be created. For desired crack-fiber angle, by changing the loading share, different mode mixities are created. Thus, the crack kink changes the loading shares. In this analysis, a comprehensive study is performed on the influence of crack-fibers orientation and crack-loading direction on SIF’s. For the first time, SIF’s are presented for cracked orthotropic specimens in different crack-fibers and crack-loading directions. SIF’s are estimated using the Finite Element Method (FEM). The presented specimen is standardized using a unite load in different directions. The crack length is assumed to be constant. Analytical relationships are also presented for the crack tip parameters in mode I and II. Pure mode I and II conditions are investigated based on SIF’s. Due to the difficulty of establishing pure mode II conditions, it is possible to establish pure mode II conditions at certain crack-fiber and load-crack angles. In these situations, mode II SIF’s can be extracted. The obtained results are validated using reported results in the literature.

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Strain energy release rate in combination with reinforcement isotropic solid model (SERIS): A new mixed-mode I/II criterion to investigate fracture behavior of orthotropic materials

Cited by 20 publications

References 56 publications

Rheology of Cement Pastes with Siliceous Fly Ash and the CSH Nano-Admixture

Rheology of Cement Pastes with Siliceous Fly Ash and the CSH Nano-Admixture

Theoretical Design of Efficient Small Molecules with sp2 Hybridized Nitrogen at Varying Positions for Organic Pull Push (ON/OFF) Solar Switches

Presentation of a new wood test specimen to investigate the fracture behavior of orthotropic materials under mixed-mode I/II loading

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