A statistical model for ubiquitiformal crack extension in quasi-brittle materials

The aim of this study is to demonstrate the influence of the stress parallel to the crack plane on subcritical crack growth in brittle materials by using a numerical code MFPA2D. The mechanism of this influence is also discussed. The curves of subcritical crack extension vs. strain of brittle materials under uniaxial and biaxial stress were obtained through numerical tests with acoustic emission consideration. The results showed that the tensile stress parallel to the crack plane has the effect on crack arrest, while the compressive stress parallel to the crack plane plays important role in crack opening process. The numerical results were consistent with experimental observed result, which shows the reliability of the numerical method, and provides theoretic foundation for failure analysis and life estimation of brittle materials.

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On the Crack Extension in Plates Under Plane Loading and Transverse Shear

Journal of Basic Engineering ◽

10.1115/1.3656897 ◽

1963 ◽

Vol 85 (4) ◽

pp. 519-525 ◽

Cited By ~ 2686

Author(s):

F. Erdogan ◽

G. C. Sih

Keyword(s):

Stress Intensity ◽

Stress Intensity Factors ◽

Crack Extension ◽

Brittle Materials ◽

Crack Tip ◽

Intensity Factors ◽

Plane Shear ◽

Tearing Modes ◽

Symmetric Plane ◽

General Plane

The crack extension in a large plate subjected to general plane loading is examined theoretically and experimentally. It is found that under skew-symmetric plane loading of brittle materials the “sliding” or the crack extension in its own plane does not take place, instead crack grows in the direction approximately 70 deg from the plane of the crack. This is very nearly the direction perpendicular to the maximum tangential stress at the crack tip, which is 70.5 deg. The hypothesis that the crack will grow in the direction perpendicular to the largest tension at the crack tip seems to be verified also by cracked plates under combined tension and shear. In spite of the fact that “sliding” and “tearing” modes of crack extension do not take place in brittle materials it is shown that one can still talk about critical stress intensity factors in plane shear and transverse bending of plates. It is also shown that, in general plane loading, the fracture criterion in terms of stress intensity factors is an ellipse.

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G110023 Applicability of crack extension to breaking process for brittle materials

The Proceedings of Mechanical Engineering Congress Japan ◽

10.1299/jsmemecj.2011._g110023-1 ◽

2011 ◽

Vol 2011 (0) ◽

pp. _G110023-1-_G110023-4

Author(s):

Naoki SAEKI ◽

Hatsuhiko USAMI

Keyword(s):

Crack Extension ◽

Brittle Materials

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SURVEY OF RECENT WORK ON THE EFFECT OF THE ATOMIC STRUCTURE'S DISCRETENESS ON CLEAVAGE CRACK EXTENSION IN BRITTLE MATERIALS

Fracture and Society ◽

10.1016/b978-0-08-022146-5.50018-x ◽

1978 ◽

pp. 43-60

Author(s):

E. Smith

Keyword(s):

Recent Work ◽

Crack Extension ◽

Brittle Materials ◽

Cleavage Crack

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Application of TEM to Deformation, Wear, and Fracture of Ceramics

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100052377 ◽

1974 ◽

Vol 32 ◽

pp. 472-473

Author(s):

B. J. Hockey

Keyword(s):

Wear Resistance ◽

High Temperature ◽

Mechanical Behavior ◽

Brittle Materials ◽

High Temperature Strength ◽

Wide Range ◽

Corrosive Environments ◽

Further Development

Ceramics, such as Al2O3 and SiC have numerous current and potential uses in applications where high temperature strength, hardness, and wear resistance are required often in corrosive environments. These materials are, however, highly anisotropic and brittle, so that their mechanical behavior is often unpredictable. The further development of these materials will require a better understanding of the basic mechanisms controlling deformation, wear, and fracture.The purpose of this talk is to describe applications of TEM to the study of the deformation, wear, and fracture of Al2O3. Similar studies are currently being conducted on SiC and the techniques involved should be applicable to a wide range of hard, brittle materials.

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