scholarly journals Transient elastic-plastic-creep crack-tip stress fields under load-controlled loading

2017 ◽  
Vol 41 (4) ◽  
pp. 949-965 ◽  
Author(s):  
H.-S. Lee ◽  
D.-J. Kim ◽  
Y.-J. Kim ◽  
R.A. Ainsworth ◽  
P.J. Budden
Keyword(s):  
Crack Tip ◽  
Stress Fields ◽  
Elastic Plastic ◽  
Creep Crack ◽  
Plastic Creep ◽  
Crack Tip Stress

scholarly journals Characterization of elastic-plastic-creep crack-tip stress fields under load and displacement control

2016 ◽  
Vol 2 ◽  
pp. 832-839
Author(s):  
Dong-Jun Kim ◽  
Han-Sang Lee ◽  
Jin-Ho Je ◽  
Yun-Jae Kim ◽  
Robert A. Ainsworth ◽  
...  
Keyword(s):  
Crack Tip ◽  
Stress Fields ◽  
Displacement Control ◽  
Elastic Plastic ◽  
Creep Crack ◽  
Plastic Creep ◽  
Crack Tip Stress

Comparison of methods for obtaining crack-tip stress distributions in an elastic-plastic material

2005 ◽  
Vol 40 (5) ◽  
pp. 431-449 ◽  
Author(s):  
C. M Davies ◽  
N. P O'Dowd ◽  
K. M Nikbin ◽  
G A Webster ◽  
F Biglari
Keyword(s):  
Principal Stress ◽  
Plastic Material ◽  
Crack Tip ◽  
Maximum Principal Stress ◽  
Stress Fields ◽  
Good Representation ◽  
Elastic Plastic ◽  
Elastic Plastic Material ◽  
Von Mises ◽  
Crack Tip Stress

Under linear elastic and elastic-plastic conditions the K field and the HRR (Hutchinson-Rice-Rosengren) field respectively are expected to provide an accurate representation of the stress field close to the crack tip in an elastic-plastic material. It has recently been proposed in French and UK defect assessment procedures that the Neuber method, originally developed for sharply curved notches, provides an alternative approach to estimate both notch and crack-tip stress fields, for use in conjunction with the sigma- d (σd) method to predict creep crack initiation times. In this work, the crack-tip stress fields under plane strain conditions, predicted from the Neuber approach, are compared with the HRR and K fields as well as those obtained from full-field finite element calculations. A compact tension and a single edge notched tension specimen have been examined; the material model used is the Ramberg-Osgood, power law plasticity model. As expected, the K field and HRR field have been found to provide a good representation of the near-tip fields at low and high loads respectively. Satisfactory solutions have also been obtained through the use of the reference stress to estimate the amplitude of the crack-tip stress in conjunction with the HRR field. The Neuber approach provides a good estimate of the equivalent (von Mises) stresses over the full range of load levels. However, but the use of the Neuber approach directly to predict the maximum principal stress in the plane of the crack provides a non-conservative prediction. A modified Neuber method, using an appropriate scaling function, has been proposed to determine the maximum principal stress in the plane of the crack from the equivalent (von Mises) stress predicted by the Neuber approach. Using the proposed method, a significantly improved estimate of the crack-tip stresses is obtained.

Simulation of Crack Tip Stress Fields in Elastic-Plastic FCC Single Crystals

2017 ◽  
Author(s):  
Guilherme Fiorin Fornel ◽  
Eduardo Bittencourt ◽  
Rafael Luis Moresco
Keyword(s):  
Single Crystals ◽  
Crack Tip ◽  
Stress Fields ◽  
Elastic Plastic ◽  
Crack Tip Stress

Constraint effects on crack tip stress fields for cracks located at the fusion line of weldments

1999 ◽  
Vol 15 (3) ◽  
pp. 275-284 ◽  
Author(s):  
C Thaulow ◽  
Z.L Zhang ◽  
M Hauge ◽  
W Burget ◽  
D Memhard
Keyword(s):  
Crack Tip ◽  
Fusion Line ◽  
Stress Fields ◽  
Constraint Effects ◽  
Crack Tip Stress

The effect of complex crack shape on crack driving forces and crack tip stress fields: Experiment and FE analysis

2020 ◽  
Vol 185 ◽  
pp. 104135
Author(s):  
Seung-Jae Kim ◽  
Kyung-Dong Bae ◽  
Yun-Jae Kim ◽  
Ho-Wan Ryu ◽  
Jin-Weon Kim ◽  
...  
Keyword(s):  
Driving Forces ◽  
Crack Tip ◽  
Fe Analysis ◽  
Stress Fields ◽  
Crack Shape ◽  
Complex Crack ◽  
Crack Tip Stress

Virtual Methods in Creep Crack Growth Predictions in 316H Stainless Steels

2007 ◽  
Author(s):  
Masataka Yatomi ◽  
Kamran M. Nikbin
Keyword(s):  
Crack Growth ◽  
Plane Strain ◽  
Stainless Steels ◽  
Creep Crack Growth ◽  
Crack Propagation Rate ◽  
Creep Model ◽  
Elastic Plastic ◽  
Creep Crack ◽  
Plastic Creep ◽  
Plane Strain Crack

The paper discusses numerically based virtual techniques of creep crack growth predictions in a fracture mechanics component. The material properties used are for 316H stainless steels and the constitutive behaviour of the steel is described by a power law creep model. A damage-based approach is used to predict the crack propagation rate in compact tension (C(T)) specimens and the data are correlated against an independently determined C* parameter. Elastic-plastic-creep analyses are performed using two different crack growth criteria to predict crack extension under plane stress and plane strain conditions. The NSW and NSW-MOD strain exhaustion models are applied to compare to the experimental data and FE predictions. The plane strain crack growth rate predicted from the numerical analysis is found to be less conservative than the plane strain NSW model but more conservative than plane strain NSW-MOD model, for values of C* within the limits of the present creep crack growth testing standards. At higher loads and C* values, the plane strain crack growth rates, predicted using an elastic-plastic-creep material response, approach is considered and compared to the plane strain NSW-MOD model.

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