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Dislocation crack tip shielding and the Paris exponent
Materials Science and Engineering: A, 2007Abstract In a previous paper we considered how the crack blunting dislocation emission mechanism likely leads to a Paris fatigue crack growth rate law exponent n = 2 if dislocation shielding is not important and showed how dislocation crack tip shielding can cause a reduction in the fatigue crack growth rate and showed qualitatively how it ...
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Journal of Mechanical Science and Technology, 2012
In this letter, the shielding or anti-shielding effect is firstly applied to obtain the behavior of two parallel cracks in a two-dimensional type-II superconducting under electromagnetic force. Fracture analysis is performed by the finite element method and the magnetic behavior of superconductor is described by the critical state Bean model.
Zhi-Wen Gao, Kang Yong Lee, You-He Zhou
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In this letter, the shielding or anti-shielding effect is firstly applied to obtain the behavior of two parallel cracks in a two-dimensional type-II superconducting under electromagnetic force. Fracture analysis is performed by the finite element method and the magnetic behavior of superconductor is described by the critical state Bean model.
Zhi-Wen Gao, Kang Yong Lee, You-He Zhou
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Stress intensity factors for crack tip shielding or anti-shielding by impurity atoms
International Journal of Fracture, 1986The average value of the crack tip stress intensity factor produced by a row of impurity atoms is calculated in this paper. The row of impurity atoms lies parallel to the crack front and is situated at an arbitrary position about a crack. The impurity atom produced mode I shielding/antishielding stress intensity factor LiI for a row of impurity atoms ...
J. Weertman, J. E. Hack
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Engineering Analysis with Boundary Elements, 2014
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Jun Lei +2 more
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Jun Lei +2 more
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On the Role of Microdefects in Crack Tip Shielding and Amplification
Durability of Composite Materials, 1994Abstract The interaction of cracks with various microdefects such as microcracks, microvoids, transformed inclusions and reinforcing fibers plays an important role in the micromechanics modeling of toughening mechanisms in advanced composite materials.
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Crack-tip stress shielding by a hard fiber in β-SiC: an atomistic study
Computer Physics Communications, 2005Abstract We present and discuss the application of large-scale molecular dynamics simulations addressed to investigate the interaction between a crack tip and a hard inclusion in monocrystalline β -SiC. We study the Griffith criterion for the stability of an isolated crack.
Alessandro Mattoni +2 more
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Crack Tip Shielding in 2090 Al-Li Alloy
1996Thermal dependency of fracture toughness as a function of normal cracking and cold pre-stressing (CPS) conditions at the 173 K is studied in 2090 Al-Li alloy. It was found that fracture toughness increases with decreasing temperature for L-T orientation.
Arie Bussiba, Moshe Kupiec, Yosef Katz
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Crack tip shielding by asperity contact as determined by acoustic measurements
Engineering Fracture Mechanics, 1987Abstract Asperity contact along the fracture surface of a crack is one of the mechanisms of crack closure. This contact shields the crack tip, in part, from the externally applied driving force. We have now succeeded in using information from acoustic transmission and diffraction experiments, obtained under plane strain conditions, to determine the ...
O. Buck, D.K. Rehbein, R.B. Thompson
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Distribution of dislocations at a mode I crack tip and their shielding effect
International Journal of Fracture, 2000Distribution of dislocations at a finite mode I crack tip is formulated. Closed form solutions for the dislocation distribution function, the dislocation-free zone (DFZ), the local stress intensity factor and the crack tip stress field are obtained. The dislocation distribution has similar features to a mode III crack model.
Jianqiao Chen, Seiichiro Kitaoka
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The stress state close to a crack tip shielded by a dislocation array
Scripta Metallurgica, 1988The dislocation shielding effect in the fracture of many FCC and BCC crystals has been discussed. In general, under a Mode I loading condition, it is suggested that dislocation shielding can result from plastic deformation which then prevents the propagation of a crack. This means that due to the back stresses of shielding the stress singularity at the
M. Lii, W.W. Gerberich
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