Results 11 to 20 of about 513,932 (143)
Using 3D Digital Image Correlation (3D-DIC) to Measure CTOD in a Semi-Elliptical Surface Crack [PDF]
Proceedings, 2018 The subsurface nature of Crack Tip Opening Displacement (CTOD) makes its direct measurement very difficult, if not impossible. During fracture toughness testing, CTOD is commonly calculated by applying a plastic hinge model using externally applied clip ...
Kaveh Samadian +2 more
doaj +2 more sources
A modified model for calculating crack tip opening displacement (CTOD) considering fracture process zone (FPZ) in rock [PDF]
Geomechanics and Geophysics for Geo-Energy and Geo-ResourcesA new CTOD calculation method is investigated in this study, considering the FPZ and the effective Young’s modulus. The calculated CTOD values from four theoretical models are compared with the measured CTOD values from the three-point beam experiments ...
Yang Qiao, Zong-Xian Zhang, Jun Zhou
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X70 STEEL CRITICAL CTOD VALUE ANSYS CALCULATION
Jixie qiangdu, 2015 With the development of ocean engineering,increase in the number of project exploration of Marine oil and gas,natural gas and oil transportation engineering are increasingly developed.
YE YunQin, MIAO ZhangMu, ZHANG BuAi
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Hierarchical Twin Networks Enable Exceptional Strength and Fracture Toughness in Titanium. [PDF]
Adv Sci (Weinh)A commercial‐purity titanium with hierarchical ultrafine twin structures delivers an exceptional combination of fracture toughness (KJIc) of 187 MPa·m1/2 and specific yield strength of 140 MPa·cm3·g−1, in which pre‐engineered high‐density twin boundaries stimulate massive and
Zou XW, Zhu T, Ma E, Han WZ.
europepmc +2 more sources
Strain Field Around Individual Dislocations Controls Failure. [PDF]
Small MethodsBy 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 +4 more
europepmc +2 more sources
Fatigue Crack Growth from Notches: A Numerical Analysis
Applied Sciences, 2020 A numerical approach based on plastic crack tip opening displacement (CTOD) was followed to study fatigue crack growth (FCG) from notches. The identification of fundamental mechanisms was made considering notched and unnotched models, with and without ...
Micael Borges +4 more
doaj +1 more source
A numerical study of crack shielding and deflection under extensive plasticity [PDF]
, 2009 Experimentally observed crack deflection events in multi-layered material systems, occurring even under pure mode-I loading, are here simulated and explained through elasto-plastic finite element modelling.
Reed, Philippa A.S. +2 more
core +1 more source
Fatigue &Fracture of Engineering Materials &Structures, Volume 46, Issue 11, Page 4103-4118, November 2023., 2023 Abstract The current work investigates the relationship between the crack growth rate (CGR) and the cyclic crack‐tip opening displacement (ΔCTOD) of microstructurally small fatigue cracks by using high‐resolution digital image correlation (DIC). Load‐controlled fatigue tests were conducted on small‐scale specimens of 18%Cr body‐centered cubic ferritic ...
Ilari Tillikainen +3 more
wiley +1 more source
Estimation of the Fracture Probability Parameters for Specimens Made by JIS SM490A Steel
Materials Research, 2021 This work established the fracture probability equation for JIS SM490A steel using the computational model supported by the local approach and the standard Crack Tip Opening Displacement (CTOD) fracture toughness experiments.
Rafael Magalhães de Melo Freire +4 more
doaj +1 more source
Fatigue &Fracture of Engineering Materials &Structures, Volume 46, Issue 10, Page 3912-3926, October 2023., 2023 Abstract The effects of mechanical and microstructural anisotropy on short fatigue crack initiation and propagation behaviors of a directionally solidified superalloy have been studied. An unusual result was found where the fatigue lives of specimens with grains longitudinally aligned along the loading direction fail at lower lifetimes than specimens ...
Yuanguo Tan +3 more
wiley +1 more source