Stress intensity factors for surface cracks in single-edge notch bend specimen by a three-dimensional weight function method

2016 ◽  
Vol 39 (11) ◽  
pp. 1407-1418 ◽  
Author(s):  
X C Zhao ◽  
X R Wu ◽  
J C Newman ◽  
D H Tong
Keyword(s):  
Stress Intensity ◽  
Stress Intensity Factors ◽  
Function Method ◽  
Three Dimensional ◽  
Surface Cracks ◽  
Bend Specimen ◽  
Single Edge ◽  
Intensity Factors ◽  
Edge Notch ◽  
Single Edge Notch Bend

Stress Intensity Factors for High Aspect Ratio Semi-Elliptical External Surface Cracks in Cylindrical Vessels

2014 ◽  
Vol 986-987 ◽  
pp. 882-886
Author(s):  
Hong Yu Qi ◽  
Peng Chao Guo
Keyword(s):  
Stress Intensity ◽  
Aspect Ratio ◽  
Stress Intensity Factors ◽  
High Aspect Ratio ◽  
External Surface ◽  
Superposition Principle ◽  
Three Dimensional ◽  
Surface Cracks ◽  
Intensity Factors ◽  
Aspect Ratios

External surface cracks can occur in cylindrical vessels due to damage and propagate in the manufacturing process and during service life. Most of research focuses on stress intensity factors for surface cracks with low aspect ratios, i.e., a/c ≤1.0. Situation may well arise where the aspect ratio of cracks is larger than one. An external longitudinal surface crack is assumed to be subjected to different types of hoop stress distributions acting perpendicular to the crack faces. The stress intensity factors (SIFs) along the crack front were determined through the three-dimensional finite element method. Then these results are used to compute approximate values of SIFs in the case of complex loadings by employing both the superposition principle and the power series expansions of the actual hoop stresses. It is found that the maximum stress intensity factor for external surface cracks with high aspect ratio occurs at different point to that with low aspect ratio.

scholarly journals Photoelastic research of threedimensional problems of fracture mechanics

2021 ◽  
Vol 1 (101) ◽  
pp. 5-14
Author(s):  
Yu. Rudyak ◽  
M. Pidgurskyi ◽  
I. Matvieieva ◽  
V. Groza ◽  
V. Sіchко ◽  
...  
Keyword(s):  
Stress Intensity ◽  
Fracture Mechanics ◽  
Stress Intensity Factors ◽  
Three Dimensional ◽  
Thin Plates ◽  
Engineering Practice ◽  
Thin Shells ◽  
Surface Cracks ◽  
Intensity Factors ◽  
Polarization Optical Method

A polarization-optical method for studying three-dimensional problems of fracture mechanics has been developed. The method was tested to determine the values of stress intensity factors (SIF) for surface cracks in thin plates and thin shells. The data of SIF values for surface cracks of different geometry, which are subjected to different loadings, are obtained. The experimentally obtained values of SIF were compared with those calculated analytically. The efficiency of the proposed technique for solving the corresponding problems of engineering practice is shown.

Inner and Outer Cracks in Internally Pressurized Cylinders

1977 ◽  
Vol 99 (1) ◽  
pp. 83-89 ◽  
Author(s):  
A. S. Kobayashi ◽  
N. Polvanich ◽  
A. F. Emery ◽  
W. J. Love
Keyword(s):  
Stress Intensity ◽  
Stress Intensity Factors ◽  
Finite Thickness ◽  
Internal Surface ◽  
Surface Cracks ◽  
Single Edge ◽  
Intensity Factors ◽  
Curvature Effects ◽  
Aspect Ratios ◽  
Dimensional Finite Element

Stress intensity factors of pressurized surface cracks at the internal surface and un-pressurized surface cracks at the external surface of an internally pressurized cylinder are estimated from stress intensity factors of a semi-elliptical crack in a finite-thickness flat plate. Curvature effects of the cylinder are determined by comparing two-dimensional finite element solutions of fixed-grip, single edge-notched plates and single edge-notched cylinders. Stress intensity factors for semi-elliptical cracks with crack aspect ratios of b/a = 0.2 and 0.98 at crack depths up to 80 percent of the cylindrical wall thickness are shown for internally pressurized cylinders with outer to inner diameter ratios, Ro/Ri, ranging from 10:9 to 5:4 for outer surface cracks and to 3:2 for inner surface cracks.

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