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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 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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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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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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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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Complete Crack-Tip Shielding of the Mode III Crack in a Work-Hardening Solid
Journal of Applied Mechanics, 1991The crack-tip shielding stress intensity factor L, for the mode III crack in a work-hardening solid is equal to L = - K, where K is the applied stress intensity factor. That is, the crack tip is perfectly shielded. This result is shown two ways: from the dislocation shielding and from the dislocation crack extension force.
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Inclined Dislocation Emission at a Shielded Crack Tip*
2023S. -J. Chang, S. M. Ohr
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PHOTOELASTIC ANALYSIS OF CRACK TIP SHIELDING AFTER AN OVERLOAD
2009The mechanism underlying the plasticity induced shielding of a crack tip during fatigue was experimentally investigated by means of photo-elasticity and by a recently-developed mathematical model which considers the stress field near the crack tip and along the flanks.
COLOMBO, CHIARA +2 more
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Shielding of Crack Tips by Dislocations
International Journal of Materials Research, 1984openaire +1 more source