Three-Dimensional Analyses of Crack-Tip-Opening Angles and δ

2009 ◽  
pp. 279-279-19 ◽  
Author(s):  
MA James ◽  
JC Newman ◽  
WM Johnston
Keyword(s):  
Three Dimensional ◽  
Crack Tip ◽  
Crack Tip Opening

Experimental Methods for Three-Dimensional Mixed Mode Fracture

2006 ◽  
Vol 326-328 ◽  
pp. 923-926
Author(s):  
Hui Ru Dong ◽  
Quan Liang Liu ◽  
Zhi Guo Zhang ◽  
Yun Xiang Cheng
Keyword(s):  
Mixed Mode ◽  
Three Dimensional ◽  
Crack Tip ◽  
Experimental Methods ◽  
Mixed Mode Fracture ◽  
Crack Tip Opening Displacement ◽  
Opening Displacement ◽  
Mode Fracture ◽  
Maximal Load ◽  
Crack Tip Opening

Experimental methods that can be used in three-dimensional mixed mode fracture researches are investigated. The methods are capable of determining the initiation load, maximal load, crack tip opening displacement, crack tip slipping displacement and initiation angle of the mixed mode crack simply and conveniently. As an example, the effect of thickness on mixed-mode I/II fracture of a kind of aluminum alloy is revealed by the methods.

Fracture Mechanics of Thin Plates and Shells Under Combined Membrane, Bending, and Twisting Loads

2005 ◽  
Vol 58 (1) ◽  
pp. 37-48 ◽  
Author(s):  
Alan T. Zehnder ◽  
Mark J. Viz
Keyword(s):  
Fracture Mechanics ◽  
Plate Theory ◽  
Experimental Studies ◽  
Three Dimensional ◽  
Crack Tip ◽  
Thin Plates ◽  
Element Analysis ◽  
Crack Tip Fields ◽  
Plates And Shells ◽  
Membrane Bending

The fracture mechanics of plates and shells under membrane, bending, twisting, and shearing loads are reviewed, starting with the crack tip fields for plane stress, Kirchhoff, and Reissner theories. The energy release rate for each of these theories is calculated and is used to determine the relation between the Kirchhoff and Reissner theories for thin plates. For thicker plates, this relationship is explored using three-dimensional finite element analysis. The validity of the application of two-dimensional (plate theory) solutions to actual three-dimensional objects is analyzed and discussed. Crack tip fields in plates undergoing large deflection are analyzed using von Ka´rma´n theory. Solutions for cracked shells are discussed as well. A number of computational methods for determining stress intensity factors in plates and shells are discussed. Applications of these computational approaches to aircraft structures are examined. The relatively few experimental studies of fracture in plates under bending and twisting loads are also reviewed. There are 101 references cited in this article.

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