Mode I stress intensity factors induced by fracture surface roughness under pure mode III loading: Application to the effect of loading modes on stress corrosion crack growth

1989 ◽  
Vol 20 (10) ◽  
pp. 1989-1999 ◽  
Author(s):  
T. S. Gross ◽  
D. A. Mendelsohn
Keyword(s):  
Surface Roughness ◽  
Stress Intensity ◽  
Fracture Surface ◽  
Stress Intensity Factors ◽  
Mode I ◽  
Pure Mode ◽  
Intensity Factors ◽  
Mode Iii ◽  
Fracture Surface Roughness ◽  
Loading Modes

Three-Dimensional Mode Separation to Obtain Stress Intensity Factors

2006 ◽  
Author(s):  
Pei Gu ◽  
R. J. Asaro
Keyword(s):  
Stress Intensity ◽  
Crack Propagation ◽  
Stress Intensity Factors ◽  
Three Dimensional ◽  
Integral Approach ◽  
Mode I ◽  
Mode Ii ◽  
Intensity Factors ◽  
Mode Iii ◽  
Mode Separation

For mixed-mode loading at a crack tip under small-scale yielding condition, mode I, mode II and mode III stress intensity factors control the crack propagation. This paper discusses three-dimensional mode separation to obtain the three stress intensity factors using the interaction integral approach. The 2D interaction integral approach to obtain mode I and mode II stress intensity factors is derived to 3D arbitrary crack configuration for mode I, mode II and mode III stress intensity factors. The method is implemented in a finite element code using domain integral method and numerical examples show good convergence for the domains around the crack tip. A complete solution for the three stress intensity factors is obtained for a bar with inclined crack face to the cross-section from numerical calculations. The solution for the bar is plotted into curves in terms of a set of non-dimensional parameters for practical engineering purpose. From the solution, mode mixity along the crack front and its implication to the direction of crack propagation is discussed.

scholarly journals An evaluation of the loading condition on mixed-mode stress intensity factors for CTST specimens made of 2024-T351 aluminum alloy

2021 ◽  
Author(s):  
Afshin Khatammanesh ◽  
Khalil Farhangdoost ◽  
Danial Ghahremani-Moghadam
Keyword(s):  
Aluminum Alloy ◽  
Stress Intensity ◽  
Stress Intensity Factors ◽  
Mixed Mode ◽  
Integral Approach ◽  
Unstable Fracture ◽  
Pure Mode ◽  
Loading Conditions ◽  
Intensity Factors ◽  
Mode Iii

In this research paper, the unstable fracture of 2024-T351 aluminum alloy is studied under a variety of in-plane and out-of-plane mixed-mode loading conditions including pure mode I and pure mode III loadings. A recently proposed loading device with compact tension shear tearing (CTST) specimens is employed for performing fracture experiments. Three-dimensional finite element analyses using the M-integral approach are conducted to derive the stress intensity factors distributions along the crack front for different mixed-mode configurations. The numerical results reveals that the coupled effect of modes II and III can be observed under mixed-modes I/II, I/III and I/II/III loading conditions. Furthermore, the values of stress intensity factors at the midsection of the specimens are used to predict the critical loads based on different mixed-mode criteria. A good consistency is observed between the theoretical predictions of the criteria and the experimental results for different loading conditions.

Effects of Thickness on Fracture Toughness of Carbon/Polyester Composite

2011 ◽  
Vol 471-472 ◽  
pp. 886-891
Author(s):  
Mohammad Hossein Heydari ◽  
Naghdali Choupani
Keyword(s):  
Fracture Toughness ◽  
Stress Intensity ◽  
Stress Intensity Factors ◽  
Mixed Mode ◽  
Mode I ◽  
Mode Ii ◽  
Pure Mode ◽  
Intensity Factors ◽  
Interlaminar Fracture ◽  
Polyester Composite

The aim of this paper is to evaluate interlaminar fracture toughness and non dimensional stress intensity factors of woven Carbon-Polyester composite based on numerical and experimental methods. A modified version of Arcan specimen was employed to conduct a mixed-mode fracture test using a special loading device. By changing the loading angle, α, from 0° to 90°, mode-I, mode-II and all mixed-mode data were created. The finite element analysis was performed with Abaqus software. The interaction j-integral was used to separate the mixed mode stress intensity factors and energy release rate at the crack tip under different loading conditions and different thickness of specimens. The results of fracture toughness tests revealed that the interlaminar fracture of composite is strong under the shearing-mode loading but weaker to the opening- mode loading. It can be seen that by increasing the thickness of the composite specimen, non dimensional stress intensity factors for pure mode I (α=0°) and pure mode II (α=90° ) loading conditions were decreased.

Mixed-mode stress intensity factors for inclined cracks in round bars

1993 ◽  
Vol 28 (4) ◽  
pp. 257-262 ◽  
Author(s):  
T H Hyde ◽  
N A Warrior
Keyword(s):  
Stress Intensity ◽  
Stress Intensity Factors ◽  
Mode I ◽  
Mode Ii ◽  
Pure Mode ◽  
Intensity Factors ◽  
Analysis Technique ◽  
Mode Stress ◽  
Photoelastic Stress ◽  
Inclined Cracks

The frozen-stress photoelastic stress analysis technique is used to obtain the mode I and mode II stress-intensity factors for cracks in round bars. The bars, which are subjected to bending, contain cracks inclined to the transverse planes of the bars. Results for inclinations of 45, 60, 75, and 90 degress are obtained. Crack depths of 0.3 ×, 0.5 ×, and 0.7 × the diameter are investigated. The results are normalized so that they can be applied to similar shaped cracks in bars of any diameter and material subjected to bending. The agreement with previously published results (for the pure mode I case) is very good, i.e., within 3 percent. The choice of normalizing parameters makes the normalized mode I and mode II stress-intensity factor relatively insensitive to the crack inclination. The mode II stress-intensity factors are practically constant along the crack fronts whereas the mode I stress intensity factors fall sharply near the ends of the crack, i.e., where they break the surface of the bar.

Crack Propagation in Rolling Line Contacts

1992 ◽  
Vol 114 (4) ◽  
pp. 690-697 ◽  
Author(s):  
H. Salehizadeh ◽  
N. Saka
Keyword(s):  
Stress Intensity ◽  
Crack Propagation ◽  
Stress Intensity Factors ◽  
Mode Ii ◽  
Pure Mode ◽  
Intensity Factors ◽  
Crack Face ◽  
Normal Loading ◽  
Line Contacts ◽  
Crack Growth Model

The stress intensity factors for short straight and branched subsurface cracks subjected to a Hertzian loading are calculated by the finite element method. The effect of crack face friction on stress intensity factors is considered for both straight and branched cracks. The calculations show that the straight crack is subjected to pure mode II loading, whereas the branched crack is subjected to both mode I and mode II, with ΔKI/ΔKII < 0.25. Although KI is small, it strongly influences KII by keeping the branched crack faces apart. Based on the ΔKII values and Paris’s crack growth model, the number of stress reversals required to grow a crack in a rolling component from an initial threshold length to the final spalling length was estimated. It was found that the crack propagation period is small compared with the expected bearing fatigue life. Therefore, crack propagation is not the rate controlling factor in the fatigue failure of bearings operating under normal loading levels.

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