Crack paths and hydrogen-Afinssisted crack growth response in AlSi 4340 steel

1984 ◽  
Vol 15 (4) ◽  
pp. 735-746 ◽  
Author(s):  
M. Gao ◽  
M. Lu ◽  
R. P. Wei
Keyword(s):  
Crack Growth ◽  
Growth Response ◽  
4340 Steel ◽  
Crack Paths

Crack Growth by Dimensional Reduction Methods

2012 ◽  
Vol 525-526 ◽  
pp. 17-20
Author(s):  
P.H. Wen ◽  
M.H. Aliabadi
Keyword(s):  
Crack Growth ◽  
Dimensional Reduction ◽  
Crack Extension ◽  
Initial Growth ◽  
Stress Criterion ◽  
The Maximum Principle ◽  
Reduction Methods ◽  
Small Increments ◽  
Crack Growth Path ◽  
Crack Paths

This paper presents a new fatigue crack growth prediction by using the dimensional reduction methods including the dual boundary element method (DBEM) and element-free Galerkin method (EFGM) for two dimensional elastostatic problems. One crack extension segment, i.e. a segment of arc, is introduced to model crack growth path. Based on the maximum principle stress criterion, this new prediction procedure ensures that the crack growth is smooth everywhere except the initial growth and the stress intensity factor of mode II is zero for each crack extension. It is found that the analyses of crack paths using coarse/large size of crack extension are in excellent agreement with analyses of the crack paths by the tangential method with very small increments of crack extension.

scholarly journals Cruciform specimens for the determination of crack growth behaviour in biaxial stress fields: calculation of K-factors

2019 ◽  
Vol 300 ◽  
pp. 11008
Author(s):  
Carl H. Wolf ◽  
Andreas Burgold ◽  
Sebastian Henkel ◽  
Meinhard Kuna ◽  
Horst Biermann
Keyword(s):  
Crack Growth ◽  
Steel Specimen ◽  
Biaxial Stress ◽  
Transmission Factor ◽  
Crack Growth Behaviour ◽  
Aluminum Specimen ◽  
Small Influence ◽  
Simplified Calculation ◽  
Crack Paths

The aim of this study is to propose a simplified calculation of the Mode I stress intensity factor K for the cruciform specimen design proposed by Brown and Miller. To calculate K, both cracks have to grow with a similar crack growth rate and the crack paths of the two single cracks with the length a should also be similar. The calculations are carried out on an aluminum specimen and a steel specimen. For all load cases and materials, the stresses resulting from the forces are first considered. It was found that the elastic constants E and ν have only a small influence of less than 3 %. In addition, the coupling between the forces of the load axes, which should be minimized by the slotted arms, is considered. Furthermore K-factors are calculated by FE for different crack lengths. These K-values together with the transmission factor allow to find a K-factor formula for cruciform specimens, which is based on the prescribed forces. Finally, the results of the FE calculation of the exact straight crack paths were compared to experimentally determined crack paths.

Fatigue Crack Growth Thresholds of Deflected Mixed-Mode Cracks in PWA1484

2005 ◽  
Vol 127 (1) ◽  
pp. 2-7 ◽  
Author(s):  
K. S. Chan ◽  
J. Feiger ◽  
Y.-D. Lee ◽  
R. John ◽  
S. J. Hudak,
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Mixed Mode ◽  
Fatigue Cracks ◽  
Symmetry Plane ◽  
Crystallographic Analysis ◽  
Mode I ◽  
Test Technique ◽  
Crack Paths

The fatigue crack growth (FCG) behavior of PWA1484 single crystals was characterized in air under mixed-mode loading at 593°C as a function of crystallographic orientation using an asymmetric four-point bend test technique. Most mixed-mode fatigue cracks deflected from the symmetry plane and propagated as transprecipitate, noncrystallographic cracks, while self-similar fatigue crack growth occurred on the (111) planes in (111)/[011] and 111/[112]¯ oriented crystals. The local stress intensity factors and the crack paths of the deflected mixed-mode cracks were analyzed using the finite-element fracture mechanics code, FRANC2D/L. The results indicated that the deflected crack path was close to being normal to the maximum tensile stress direction where the Mode II component diminishes. Crystallographic analysis of the deflected crack paths revealed that the Mode I and the deflected mixed-mode cracks were usually of different crystallographic orientations and could exhibit different Mode I FCG thresholds when the crystallography of the crack paths differed substantially. These results were used to identify the driving force and conditions for cracking mode transition.

A Study of Transient Crack Growth in AISI 4340 Steel in NaCl Solution

CORROSION ◽  
1985 ◽  
Vol 41 (3) ◽  
pp. 151-159 ◽  
Author(s):  
D. D. Macdonald ◽  
H. H. Chung
Keyword(s):  
Crack Growth ◽  
Nacl Solution ◽  
Aisi 4340 Steel ◽  
4340 Steel ◽  
Aisi 4340

scholarly journals Effect of thermal aging and irradiation on microstructure and crack growth response of Alloy 690

2021 ◽  
Author(s):  
Bogdan Alexandreanu ◽  
Yiren Chen ◽  
Xuan Zhang ◽  
Wei-Ying Chen
Keyword(s):  
Crack Growth ◽  
Thermal Aging ◽  
Growth Response ◽  
Alloy 690
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