scholarly journals Effect of Mechanical Mismatch on the Stress Intensity Factors of Inclined Cracks under Mode I Tension Loading

2015 ◽  
Vol 773-774 ◽  
pp. 129-133
Author(s):  
Mohd Azwir Azlan ◽  
Al Emran Ismail
Keyword(s):  
Stress Intensity ◽  
Stress Intensity Factors ◽  
Mode I ◽  
Mode Ii ◽  
Intensity Factors ◽  
Finite Element Program ◽  
Element Program ◽  
Plain Strain ◽  
Tension Loading ◽  
Inclined Cracks

This paper presents numerical analysis of stress intensity factors (SIFs) of inclined cracks due to mechanical mismatches. According to literature survey, tremendous amounts of SIFs can be found elsewhere. However, the SIFs for inclined cracks are difficult to obtain especially when mechanical mismatch at the crack interface are considered. ANSYS finite element program is used to model the cracks embedded in plain strain plates. The cracks are oriented at the interface between two different materials and subjected to mode I tension loading. It is showed that when mechanical mismatches are introduced the mode I SIFs reduced and on the other hand mode II SIFs increased. When the cracks are inclined, the mode I SIFs diverged but it is not for mode II SIFs and gradually increased when compared with the normal cracks.

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.

Estimation of Mixed-Mode Stress Intensity Factors with Presence of the Confinement Parameters T-Stress and A3

2016 ◽  
Vol 18 ◽  
pp. 52-57
Author(s):  
Lahouari Fodil ◽  
Abdallah El Azzizi ◽  
Mohammed Hadj Meliani
Keyword(s):  
Stress Intensity ◽  
Stress Intensity Factors ◽  
Mixed Mode ◽  
Compact Tension ◽  
Mode I ◽  
Mode Ii ◽  
Mixed Mode Fracture ◽  
Intensity Factors ◽  
Element Analysis ◽  
T Stress

A failure criterion is proposed for ductile fracture in U-notched components under mixed mode static loading. The Compact Tension Shear (CTS) is the preferred test specimen used to determine stress intensity factor in the mode I, mode II and the mixed-mode fracture. In this work, the mode I and mode II stress intensity factors were computed for different notch ratio lengths 0.1<a/W<0.7, of the inner radius of notch 0.25mm<ρ<4mm and load orientation angles 0°<α< 90° using finite element analysis. However, a review of numerical analysis results reveals that the conventional fracture criteria with only stress intensity factors (NSIFs) Kρ first term of Williams’s solution provide different description of stress field around notch zone comparing with results introduce the second and third parameter T-stress and A3.

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.

Evaluation of stress intensity factors by using the parallel finite element program ADVNETURE

2003 ◽  
Vol 2003.16 (0) ◽  
pp. 539-540
Author(s):  
Mayumi HIGASHI ◽  
Hiroshi OKADA ◽  
Tsuyoshi KAMIBEPPU ◽  
Yasuyoshi FUKUI ◽  
Noriyoshi KUMAZAWA
Keyword(s):  
Finite Element ◽  
Stress Intensity ◽  
Stress Intensity Factors ◽  
Intensity Factors ◽  
Finite Element Program ◽  
Element Program ◽  
Parallel Finite Element

Stress intensity factors in fretting fatigue

1979 ◽  
Vol 14 (1) ◽  
pp. 1-6 ◽  
Author(s):  
D P Rooke ◽  
D A Jones
Keyword(s):  
Stress Intensity ◽  
Crack Length ◽  
Stress Intensity Factors ◽  
Polynomial Function ◽  
Fretting Fatigue ◽  
Mode I ◽  
Mode Ii ◽  
Shear Stresses ◽  
Intensity Factors ◽  
Tangential Forces

Solutions are derived for mode I and mode II stress intensity factors for a crack at the edge of a sheet subjected to localized fretting forces. Both normal and tangential forces are considered. These solutions are approximated by a polynomial function of crack length, which is then used as a Green's function to derive stress intensity factors for arbitrary distributions of tensile and shear stresses at the edge of the sheet.

Stress Intensity Factors of Eccentric Cracks in Bi-Material Plates

2014 ◽  
Vol 663 ◽  
pp. 98-102 ◽  
Author(s):  
Al Emran Ismail
Keyword(s):  
Stress Intensity ◽  
Stress Intensity Factors ◽  
Edge Crack ◽  
Central Line ◽  
Mode I ◽  
Single Edge ◽  
Intensity Factors ◽  
Finite Element Software ◽  
Edge Cracks ◽  
Plain Strain

This paper presents the effect of eccentric cracks on the behavior of stress intensity factors (SIF) of single edge crack in bi-material plates. According to literature, it is found that most of the research conducted previously more on central single edge crack and it is well understood. However, not many research conducted on the eccentric stress intensity factor of single edge crack in bi-material plates. In order to evaluate the SIFs of eccentric edge cracks, ANSYS finite element software is used to model plain strain single edge crack in a plate subjected mode I loadings. The present SIFs are then validated with the existing central crack and it is well agreed to each others. According to the present results, it is found that mode I SIFs decreased insignificantly and mode II SIFs decreased asymptotically when the crack situated away from the central line. As expected all types of SIFs increased when crack length is increased.

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