Results 211 to 220 of about 13,745 (237)
Some of the next articles are maybe not open access.
1977
Theoretical calculation and experimental measurement of fatigue crack tip plastic zone size are reviewed, and recent plastic zone measurements using selected area electron channeling are presented. The relationships between state of stress, measurement technique, and plastic zone shape and size are discussed.
J Lankford, DL Davidson, TS Cook
openaire +1 more source
Theoretical calculation and experimental measurement of fatigue crack tip plastic zone size are reviewed, and recent plastic zone measurements using selected area electron channeling are presented. The relationships between state of stress, measurement technique, and plastic zone shape and size are discussed.
J Lankford, DL Davidson, TS Cook
openaire +1 more source
CRACK TIP PARAMETERS FOR CREEP‐BRITTLE CRACK GROWTH
Fatigue & Fracture of Engineering Materials & Structures, 1998Crack growth histories for creep‐brittle aluminium alloy 2519‐T87 are simulated by controlling the rate of release of finite element nodes along the crack growth path using a variable time‐step, nodal release algorithm. While earlier experimental studies established little or no correlation between time‐dependent fracture parameters and the crack ...
null Hall, null McDowell, null Saxena
openaire +1 more source
2016
This chapter includes some theoretical aspects of linear-elastic fracture mechanics (LEFM) when a crack tip undergoes some plasticity [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24]. For a small-scale yielding (SSY ) approximation, the plastic zone size (r) is used to define the classical singularity in the elastic ...
openaire +1 more source
This chapter includes some theoretical aspects of linear-elastic fracture mechanics (LEFM) when a crack tip undergoes some plasticity [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24]. For a small-scale yielding (SSY ) approximation, the plastic zone size (r) is used to define the classical singularity in the elastic ...
openaire +1 more source
Crack Tip Plasticity of a Tearing Crack
1985The effects of crack tip plasticity associated with rapid tearing under Mode I and stable crack growth under combined Modes I and II crack tip deformations are analyzed by a modified Dugdale model. The modification consists of an unloaded region immediately ahead of the crack tip.
OS Lee, AS Kobayashi
openaire +1 more source
On crack-tip cooling during dynamic crack initiation
International Journal of Solids and Structures, 2001Abstract This paper presents a hybrid experimental–numerical treatment of the transient thermoelastic effects around a crack tip, subjected to a dynamic loading. A simple numerical procedure was devised to calculate the transient crack-tip temperature field, in a “one-way” coupled approach.
Bougaut, O., Rittel, D.
openaire +2 more sources
Creep crack propagation by cavitation near crack tips
Metal Science, 1980Abstract A model in which cracks propagate by nucleation, growth, and coalescence with cavities in front of the crack tip is analysed in detail. The applied stress field is assumed to be elastic or elastic–plastic, and the relaxation of stresses from the growth of cavitation damage is included in the analysis. The spacing of the cavities, the threshold
R. Raj, S. Baik
openaire +1 more source
Some experimental observations on crack closure and crack‐tip plasticity
Fatigue & Fracture of Engineering Materials & Structures, 2009ABSTRACTThis study presents a methodology for evaluating crack closure and the effect of crack‐tip plasticity on stress intensity. Full‐field displacement maps obtained by digital image correlation are used to obtain the mixed‐mode, crack‐driving force.
Lopez-Crespo, P +4 more
openaire +3 more sources
Corrosion Science, 2010
A theoretical equation for stress corrosion crack growth rate of austenitic alloys in high temperature water is reformulated based on crack tip asymptotic fields and crack tip transient oxidation kinetics. A general oxidation kinetic law is introduced, emphasizing the role of mass transport through solid oxide film at the crack tip.
Tetsuo Shoji +2 more
openaire +1 more source
A theoretical equation for stress corrosion crack growth rate of austenitic alloys in high temperature water is reformulated based on crack tip asymptotic fields and crack tip transient oxidation kinetics. A general oxidation kinetic law is introduced, emphasizing the role of mass transport through solid oxide film at the crack tip.
Tetsuo Shoji +2 more
openaire +1 more source
Crack-Tip-Acuity Effect on Crack Growth Initiation
Journal of Engineering Materials and Technology, 1987For a stationary crack of an initially finite root radius in plane-strain tension, the strain fields around the smoothly blunted crack-tip are calculated for each deformation stage using the slipline field method for nonhardening plastic material. The crack growth initiation from the blunt crack-tip in small-scale yielding, with a full triaxiality ...
openaire +1 more source
Crack tip-dislocation loop interactions
Materials Science and Engineering: A, 1991The elastic interaction between a circular dislocation loop and a crack in an infinite isotropic medium has been studied. This is believed to have a profound influence on the process of dislocation emission from the crack tip, especially in irratiated metals where loops are found in abundance.
A.S. Kirtikar, A.H. King
openaire +1 more source