Results 221 to 230 of about 1,119 (244)

Crack tip shielding by asperity contact as determined by acoustic measurements

Engineering Fracture Mechanics, 1987
Abstract 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
openaire   +1 more source

Distribution of dislocations at a mode I crack tip and their shielding effect

International Journal of Fracture, 2000
Distribution 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
openaire   +1 more source

Crack-Tip Shielding in Particulate Composites Undergoing Damage

1998
A simple rate-independent phenomenological constitutive model is used to model fracture behavior in elastic particulate composites undergoing damage. The constitutive model consists of two damage functions that govern the degradation of the bulk and the shear moduli.
Ravichandran, G., Liu, C. T.
openaire   +2 more sources

The stress state close to a crack tip shielded by a dislocation array

Scripta Metallurgica, 1988
The 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
openaire   +1 more source

Complete Crack-Tip Shielding of the Mode III Crack in a Work-Hardening Solid

Journal of Applied Mechanics, 1991
The 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.
openaire   +1 more source

Inclined Dislocation Emission at a Shielded Crack Tip*

2023
S. -J. Chang, S. M. Ohr
openaire   +1 more source

PHOTOELASTIC ANALYSIS OF CRACK TIP SHIELDING AFTER AN OVERLOAD

2009
The 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, E. Patterson, VERGANI, LAURA MARIA   +2 more
openaire   +1 more source

A higher order thermoelastic analysis of fatigue crack growth can assess crack tip shielding

Fatigue and Fracture of Engineering Materials and Structures, 2023
Vasco-Olmo JOSÉ Manuel, Alonso Camacho Reyes, Diaz F A   +2 more
exaly  

Shielding of Crack Tips by Dislocations

International Journal of Materials Research, 1984
openaire   +1 more source

Effect of Crack-tip Shielding by Dislocations on Fracture Toughness – in Relation to Hydrogen Embrittlement –

ISIJ International, 2022
Masaki Tanaka, Kenji Higashida, Sunao Sadamatsu   +2 more
exaly