Analysis of fracture initiation angle in some cracked ceramics using the generalized maximum tangential stress criterion

Aliha, M.R.M.; Ayatollahi, M.R.

doi:10.1016/j.ijsolstr.2012.03.029

Cited by 87 publications

(40 citation statements)

References 29 publications

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“…(5), the direction of the fracture initiation depends on the critical distance, rc, where the tangential strain component is evaluated. According to the literature (Ayatollahi & Aliha, 2008Aliha et al, 2010Aliha et al, , 2012, 2014, Akbardoost et al, 2014Ayatollahi et al, 2006Ayatollahi et al, , 2011b, the critical distance parameter may have different values for different brittle and quasi-brittle materials like, ceramics (within the range of 0.068 mm and 0.5 mm), brittle polymers (e.g. PMMA with rc in the range of 0.05 and 0.2 mm), graphite (rc = 0.35 mm and rc = 0.47 mm for graphite 7477and graphite SA, respectively) or rocks (rc = 2 to 6 mm).…”

Section: Numerical Example and Discussionmentioning

confidence: 99%

Fracture of underwater notched structures

Mirsayar¹,

Takabi²

2016

10.5267/j.esm

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Underwater structures are subjected to hydrostatic pressure during their service life. Sharp Vnotched components can be seen as a part of many underwater structures. For example, welded components, machined parts, gears, screws and bolts are among the well-known elements that contain sharp V-notches. The notch tip is a likely zone for initiation of cracks due to high stress/ strain concentration. The reliability analysis of the V-notched components requires a good understanding of stress/ strain distribution near the notch tip. The fracture initiation of the Vnotched components can be controlled by the tangential strain field near the notch tip. The tangential strain distribution and fracture initiation conditions are studied in this paper for notched components subjected to hydrostatic pressure. The effect of each tangential strain term on fracture initiation angle as well as tangential strain distribution around the notch tip is investigated using finite element simulation of a V-notched semi-circular specimen. It is shown that not only the singular terms, but also the "constants train field" significantly influence on tangential strain distribution and fracture initiation angle around the notch tip. The results of this paper can be used for standardization of the fracture in underwater structures containing V-notched components.

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Section: Numerical Example and Discussionmentioning

confidence: 99%

Fracture of underwater notched structures

Mirsayar¹,

Takabi²

2016

10.5267/j.esm

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“…This includes the determination of crack initiation angles which describe the first instant of cracking path. Several criteria were proposed in many researchers to address and to predict the crack initiation angle in loading leading to I/II mixed mode fracture at the crack tip (Khan & Khraisheh, 2000;Mirlohi & Aliha, 2013;Aliha et al, 2010Aliha, & Ayatollahi, 2012). Many criteria are used to understand the fracture behavior of materials under mixed mode I/II loading conditions such as maximum tangential stress (Erdogan & Shi, 1963), minimum strain energy density (Sih & Macdonald, 1974), maximum energy release rate (Hussain, 1974;Nuismer, 1975) and maximum tangential strain (Chang, 1981).…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of mixed mode I/II stress intensity factors of edge slant cracked plates

Fayed¹

2017

10.5267/j.esm

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Mixed mode I/II stress intensity factors of an edge slant-cracked plate under tensile loading were assessed. A two-dimensional finite element analysis was employed using ABAQUS. Various crack lengths and angles were analyzed. The effect of the crack location at the plate edge was also examined. Crack initiation angles were calculated. In general, modes I and II stress intensity factor increase with increasing crack length. However, the rate of increase in mode I SIF decreases with increasing the main crack angle. The results showed that stress intensity factors decreased ad the crack mouth approaches the edge mid line. The crack location becomes more significant as the crack length increases. The angle of first cracking depends on crack length, location, and angle.

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“…Many research works have been carried out using different test specimens and different techniques. The most popular brittle materials of interest for mixed mode fracture were mainly rocks [9], [10], [12], [14], [15], ceramics [5], [8], [20], [21], Glasses like plexiglass (PMMA) [2], [3], [7], [11], [15], [16], soda lime silica glass [4], [6], [7], [13], [17], [18], [19] and some polymers.…”

Section: Introductionmentioning

confidence: 99%

“…Indentation technique used are Knoop indentation tests [4], [6] and Vickers indentation tests [8], [13]. The popular test methods used for experiments include cracked Brazilian disc [10], [11], [12], [14], [19], [21] under diametrical compression and semicircular bend specimen [9], [12], [15], [16], [20] with thru crack under three point bending. From the literature it can be concluded that the simplicity of loading fixture, manufacturing ease and specimen pre-cracking were prime reasons for selecting specimens and testing procedure for particular mixed mode testing in brittle material [15].…”

Section: Introductionmentioning

confidence: 99%

“…Some of the researchers derived the empirical equation which closely approximated experimental results for brittle fracture in mixed mode. Generalized or modified maximum tangential stress criterion (GMTS) [1], [15], [16], [19], [20], [21] used in many research works which takes into account T-stress. In cracked Brazilian disc specimen negative T-stresses [19] would be present which enhances fracture resistance in CBD.…”

Section: Introductionmentioning

confidence: 99%

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