scholarly journals The characterization of dominating region of fracture (process region) around a crack tip based on the concept of mechanical similarity and atomic mechanics

2014 ◽  
Vol 8 (2) ◽  
pp. 93-103
Author(s):  
A. Toshimitsu Yokobori, Jr. ◽  
Yoshiko Nagumo ◽  
Takahiro Yajima ◽  
Toshihito Ohmi
Keyword(s):  
Fracture Process ◽  
Crack Tip ◽  
Process Region

Characterization of Fatigue Crack Tip Deformation.

1978 ◽  
Author(s):  
James Lankford ◽  
Davidson Jr. ◽  
David L.
Keyword(s):  
Fatigue Crack ◽  
Crack Tip

Characterization of crack tip and geometry induced closure

1997 ◽  
Vol 19 (93) ◽  
pp. 205-210 ◽  
Author(s):  
W.J. Evans ◽  
S.H. Spence
Keyword(s):  
Crack Tip

The characterization of a crack-tip field

1991 ◽  
Vol 39 (2) ◽  
pp. 213-217 ◽  
Author(s):  
H.W. Liu ◽  
Chen Qi ◽  
Sanjiv K. Sinha
Keyword(s):  
Crack Tip ◽  
Crack Tip Field

Crack Tip Opening Angle: Measurement and Modeling of Fracture Resistance in Low and High Strength Pipeline Steels

2006 ◽  
Author(s):  
Ph. P. Darcis ◽  
G. Kohn ◽  
A. Bussiba ◽  
J. D. McColskey ◽  
C. N. McCowan ◽  
...  
Keyword(s):  
Steady State ◽  
Fracture Resistance ◽  
Fracture Process ◽  
Pipeline Steel ◽  
Crack Tip ◽  
High Strength ◽  
Opening Angle ◽  
Test Technique ◽  
Crack Tip Opening Angle ◽  
Crack Tip Opening

Crack tip opening angle (CTOA) is becoming one of the more widely accepted properties for characterizing fully plastic fracture. In fact, it has been recognized as a measure of the resistance of a material to fracture, in cases where there is a large degree of stable-tearing crack extension during the fracture process. This type of steady-state fracture resistance takes place when the CTOA in a material reaches a critical value, as typically occurs in low-constraint configurations. Our current research has applied the CTOA concept as an alternative or an addition to the Charpy V-notch and the drop weight tear test (DWTT) fracture energy in pipeline characterization. A test technique for direct measurement of CTOA was developed, using a modified double cantilever beam (MDCB) specimen. A digital camera and image analysis software are used to record the progression of the crack tip and to estimate CTOA using the crack edges adjacent to the crack tip. A steady-state CTOA has been successfully measured on five different strength grades of gas pipeline steel (four low strength grades and one high strength grade: X100). In addition, two-dimensional finite element models (2D FEMs) are used to demonstrate the sequence of the fracture process and the deformation mechanisms involved. The CTOA measurements and models are correlated and agree well.

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