Results 1 to 10 of about 232 (144)

Numerical Study on the Variability of Plastic CTOD [PDF]

Materials, 2020
This paper presents a numerical study on the influence of material parameters and loading variability in the plastic crack tip opening displacement (CTOD) results. For this purpose, AA7050-T6 was selected as reference material and a middle-cracked tension specimen geometry was considered. The studied input parameters were the Young’s modulus, Poisson’s
Pedro A Prates, Micael F Borges, F V Antunes   +2 more
exaly   +6 more sources

Crack Growth in Ni-Cr-Mo-V Steel Using ΔCTOD Elastic–Plastic Model

Journal of Marine Science and Engineering, 2022
Many studies have shown that the linear elastic fracture mechanics (LEFM) method based on the stress intensity factor range (ΔK) has limitations that cannot be ignored. Due to neglecting the influence of plastic deformation near the crack tip, LEFM shows
Jiankang Lei, Y Garbatov
exaly   +4 more sources

Effect of numerical parameters on plastic CTOD [PDF]

Fracture and Structural Integrity, 2017
Fatigue crack growth (FCG) is associated with irreversible and non-linear processes happening at the crack tip. This explains different problems observed in the use of da/dN-?K curves, namely the inability to explain stress ratio and load history effects.
F.V. Antunes, R. Simoes, R. Branco, P. Prates   +3 more
doaj   +4 more sources

Characterisation of fatigue crack growth using digital image correlation measurements of plastic CTOD [PDF]

Theoretical and Applied Fracture Mechanics, 2019
Crack tip opening displacement (CTOD) was measured using digital image correlation (DIC) and resolved into elastic and plastic CTOD components via an offset compliance technique. The plastic CTOD range gave a single linear correlation for fatigue crack growth rate at stress ratios of 0.1 and 0.6 in compact- tension (CT) specimens of Grade 2 titanium. A
J M Vasco-Olmo, Francisco A Diaz, F V Antunes   +2 more
exaly   +4 more sources

Three-dimensional numerical study of thickness effect on plastic CTOD and monotonic plastic zone in an aluminium CT specimen

Theoretical and Applied Fracture Mechanics, 2023
This work is a numerical study of CT specimens with straight cracks and different thickness values submitted to different load levels, which aims to analyse the shape and dimension variations of the monotonic yielded area near the crack tip, examining the impact of variables such as load magnitude, thickness of the specimen and position along the crack
D Camas, Ricardo Branco, F V Antunes
exaly   +5 more sources

Mechanical, microstructural and fracture studies on inconel 825-SS316L functionally graded wall fabricated by wire arc additive manufacturing. [PDF]

Sci Rep, 2023
This paper presents a novel method that uses the cold metal transfer based wire arc additive manufacturing process to fabricate functionally graded Inconel 825–SS316L walls.
Senthil TS, Babu SR, Puviyarasan M.
europepmc   +2 more sources

Strain Field Around Individual Dislocations Controls Failure. [PDF]

Small Methods
By conducting in situ transmission electron microscopy strain mapping during a nanoscale fracture experiment, the dislocation processes taking place at the crack tip in the rather brittle metal chromium is detailed. Moreover, for the first time, the local stress fields of the dislocations shielding the crack is directly measured. Abstract Understanding
Gammer C, Issa I, Minor AM, Ritchie RO, Kiener D.   +4 more
europepmc   +2 more sources

Plastic CTOD as fatigue crack growth characterising parameter in 2024‐T3 and 7050‐T6 aluminium alloys using DIC [PDF]

Fatigue and Fracture of Engineering Materials and Structures, 2020
AbstractThe plastic range of crack tip opening displacement (CTOD) has been used for the experimental characterisation of fatigue crack growth for 2024‐T3 and 7050‐T6 aluminium alloys using digital image correlation (DIC). Analysis of a complete loading cycle allowed resolving the CTOD into elastic and plastic components.
J M Vasco-Olmo, F V Antunes, M N James   +2 more
exaly   +4 more sources

Experimental analysis of the plastic CTOD to characterize the variable amplitude fatigue crack growth in Grade 2 titanium samples

International Journal of Fatigue, 2023
T1, Q1 (15/183 en Mechanical Engineering, IF 2023 = 5.7)
G L G Gonzales, F V Antunes, Diogo M Neto   +2 more
exaly   +4 more sources

Fatigue crack propagation studies based on the plastic component of the CTOD evaluated from Digital Image Correlation data

Procedia Structural Integrity, 2022
This work presents a new approach based on the Crack Tip Opening Displacement (CTOD) for studying the fatigue crack growth. The plastic component of the CTOD is employed for predicting the crack propagation on austenitic stainless steel. This is in contrast to Linear Elastic Fracture Mechanics analysis based on the Stress Intensity Factor (SIF) (Ewalds
Alejandro S Cruces, F V Antunes, Pablo Lopez-Crespo   +2 more
exaly   +3 more sources