scholarly journals Couple effects of mixed mode biaxial loading and crack tip configuration on plastic stress intensity factor behavior at small and large scale yielding

2019 ◽  
Vol 18 ◽  
pp. 749-756
Author(s):  
A.P. Zakharov ◽  
V.N. Shlyannikov ◽  
A.M. Tartygasheva ◽  
D.V. Fedotova
Keyword(s):  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Mixed Mode ◽  
Large Scale ◽  
Biaxial Loading ◽  
Crack Tip ◽  
Scale Yielding ◽  
Plastic Stress

Plastic Stress Intensity Factors for Small Scale Yielding in Antiplane Shear by Caustics

1982 ◽  
Vol 49 (4) ◽  
pp. 754-760 ◽  
Author(s):  
P. S. Theocaris ◽  
C. I. Razem
Keyword(s):  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Crack Tip ◽  
Antiplane Shear ◽  
Elastic Behavior ◽  
Small Scale ◽  
Small Scale Yielding ◽  
Scale Yielding ◽  
Plastic Stress

The KIII-stress intensity factor in an edge-cracked plate submitted to antiplane shear may be evaluated by the reflected caustic created around the crack tip, provided that a purely elastic behavior exists at the crack tip [1]. For a work-hardening, elastic-plastic material, when stresses at the vicinity of the crack tip exceed the yield limit of the material, the new shape of caustic differs substantially from the corresponding shape of the elastic solution. In this paper the shape and size of the caustics created at the tip of the crack, when small-scale yielding is established in the vicinity of the crack tip, were studied, based on a closed-form solution introduced by Rice [2]. The plastic stress intensity factor may be evaluated from the dimensions of the plastic caustic. Experimental evidence with cracked plates made of opaque materials, like steel, corroborated the results of the theory.

scholarly journals Plastic stress intensity factor behavior at small and large scale yielding

2020 ◽  
Vol 14 (53) ◽  
pp. 223-235
Author(s):  
Alexander Zakharov ◽  
Valery Shlyannikov ◽  
Anastasia Tartygasheva
Keyword(s):  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Large Scale ◽  
Scale Yielding ◽  
Plastic Stress

Experimental and Numerical Analyses of Mixed Mode Crack Initiation Angle

2006 ◽  
Author(s):  
Jafar Al Bin Mousa ◽  
Nesar Merah ◽  
Abdel-Salam Eleiche ◽  
Abul-Fazal Arif
Keyword(s):  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Crack Initiation ◽  
Mixed Mode ◽  
Crack Tip ◽  
Numerical Analyses ◽  
Mixed Mode Fracture ◽  
Smith Method ◽  
Crack Initiation Angle

This paper presents a study for predicting crack initiation angle in the case of mixed mode fracture i.e., opening and sliding mode. Experimental and numerical analyses were carried out using photoelasticity and ANSYS finite element program, respectively. Polycarbonate specimens with a thickness of 3mm and different angles of inclinations namely 0° and 22.5° were considered in this analysis. Predicting the crack initiation angles is dependent on the value of stress in the vicinity of the crack tip. As a result, stress intensity factor is considered as the most significant parameter in this regard because it represents the stress level at the crack tip. In experimental analysis Schroedl and Smith method is used to calculate the pure opening mode stress intensity factor (KI) and Smith and Smith method for the mixed mode case (KI & KII). Then, SIF’s for straight and inclined crack are determined numerically using ANSYS. After that, the values of stress intensities are incorporated in minimum strain energy density criterion (S-Criterion) to find the crack’s angle of initiation.

Does the Biaxial Loading Affect the Apparent Fracture Toughness (Kc)?

2019 ◽  
Author(s):  
Chentong Chen ◽  
Hanbin Xiao ◽  
Yuh J. Chao ◽  
Poh-Sang Lam
Keyword(s):  
Fracture Toughness ◽  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Test Data ◽  
Biaxial Loading ◽  
Stress Component ◽  
Crack Tip ◽  
Apparent Fracture Toughness ◽  
Biaxial Load

Abstract From linear elastic fracture mechanics (LEFM), it is well accepted that only the singular stress near the crack tip contributes to the fracture event through the crack tip stress intensity factor K. In the biaxial loading, the stress component that adds to the T-stress at the crack tip, affects only the second term in the Williams’ series solution around the crack tip. Therefore, it is generally believed that biaxial load does not change the apparent fracture toughness or the critical stress intensity factor (Kc). This paper revisited several specimen geometries under biaxial loading with finite element method. The sources of discrepancy between the theory and the test data were identified. It was found that the ideal biaxial loading would not be achieved for typical fracture specimens with finite geometry. Comparison to available test data shows that, while the biaxial load could affect the apparent fracture toughness, the contribution is relatively small.

Does the Biaxial Loading Affect the Apparent Fracture Toughness (KC)?

2020 ◽  
Vol 142 (3) ◽  
Author(s):  
Chentong Chen ◽  
Hanbin Xiao ◽  
Yuh J. Chao ◽  
Poh-Sang Lam
Keyword(s):  
Fracture Toughness ◽  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Test Data ◽  
Biaxial Loading ◽  
Stress Component ◽  
Crack Tip ◽  
Apparent Fracture Toughness ◽  
Biaxial Load

Abstract From linear elastic fracture mechanics (LEFM), it is well accepted that only the singular stress near the crack tip contributes to the fracture event through the crack tip stress intensity factor K. In the biaxial loading, the stress component that adds to the T-stress at the crack tip, affects only the second term in the Williams' series solution around the crack tip. Therefore, it is generally believed that biaxial load does not change the apparent fracture toughness or the critical stress intensity factor (Kc). This paper revisited several specimen geometries under biaxial loading with finite element method. The sources of discrepancy between the theory and the test data were identified. It was found that the ideal biaxial loading would not be achieved for typical fracture specimens with finite geometry. Comparison to available test data shows that, while the biaxial load could affect the apparent fracture toughness, the contribution is relatively small.

Evaluation of Stress-Intensity Factor of Mixed-Mode Crack by Hybrid Speckle Photography

2002 ◽  
Author(s):  
Kenji Machida
Keyword(s):  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Mixed Mode ◽  
Least Squares Method ◽  
Processing System ◽  
Crack Tip ◽  
Speckle Photography ◽  
Element Analysis ◽  
Virtual Crack Extension Method

The experiment was conducted on the compact normal and shear (CNS) specimens made of homogeneous and dissimilar materials subjected to mixed-mode loading. Many Young’s fringes patterns around the crack tip were taken and analyzed by the image-processing system developed in my laboratory. The displacement obtained by speckle photography is not as smooth as that obtained by the finite element analysis (FEA). Therefore, the displacement data were smoothed by 2 D FFT filtering and least squares method. The intelligent hybrid method proposed by Nishioka et al. was applied to the stress-strain analysis. Consequently, the stress and strain near the crack tip can be evaluated with high accuracy by the present stress-analyzing system. Then, the stress-intensity factor was evaluated by the virtual crack extension method (VCEM) and displacement extrapolation. The accuracy of stress-intensity factor at the free surface was discussed from both viewpoint of experiment and 3 D FEA.

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