Random Load Fatigue Crack Growth in T-Joints

1977 ◽  
Author(s):  
R.D. Hibberal ◽  
W.D. Dover
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Random Load ◽  
T Joints

A New Approach for Modeling of Fatigue Crack Growth in Welded Cruciform and Curve T Joint Structures

2005 ◽  
Author(s):  
Mohammad S. Alam ◽  
Muhammad A. Wahab
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Propagation ◽  
Crack Growth ◽  
Bonding Strength ◽  
Computer Time ◽  
Interface Element ◽  
Interface Debonding ◽  
T Joints ◽  
New Approach

A new approach for the simulation of fatigue crack growth in welded joint has been developed and the concept has been applied to welded cruciform and curve T-joints. The phenomena of crack propagation and interface debonding can be regarded as the formation of new surface. Thus, it is possible to model these problems by introducing the mechanism of surface formation. In the proposed method, the formation of new surface is represented by interface element based on the interface potential energy. The properties of this interface element represent the bonding strength of the material. As the cyclic load continues, the bonding strength decreases between the interacting surfaces and the crack propagates slowly. Based on this concept, an ANSYS code has been written for the simulation of crack propagation. Using this code, fatigue crack growth rate and fatigue crack propagation life of 2-D FEM models of welded cruciform and curve T-joints for different stress/load ratios have been analyzed and presented in this paper. The method is relatively simple compared to other conventional FEM method and save computer time significantly. The predicted results are compared with experimental results and good agreement has been achieved.

Crack closure at positive stresses during random load fatigue crack growth

1976 ◽  
Vol 11 (1) ◽  
pp. 32-38 ◽  
Author(s):  
W D Dover ◽  
N F Boutle
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Crack Closure ◽  
Dynamic Range ◽  
Broad Band ◽  
Random Load ◽  
Fatigue Crack Closure ◽  
Closure Stress ◽  
Strain Fracture

Fatigue crack closure at positive stresses during broad band, random load fatigue crack growth, has been investigated. Tests were performed on centre-notched specimens made from an aluminium alloy (B.S. 2L 71). The closure stress was found to be dependent upon the material thickness, the mode of fracture and the stress ratio Q. Under plane strain fracture mode conditions it was found that the closure stress for 22 mm thick specimens was greater than that found with 6 mm thick specimens. This difference in closure behaviour produced a slower fatigue crack growth rate for the thicker specimens. In addition it was found that for a given r.m.s. stress the fatigue crack closure level only impinged upon the dynamic range at low mean stress levels.

Fatigue Crack Growth In T-Joints; Out-Of-Plane Bending

1978 ◽  
Author(s):  
W.D. Dover ◽  
M.S.J. Holdbrook ◽  
R.D. Hibberd ◽  
F.D.W. Charlesworth
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
T Joints ◽  
Out Of Plane ◽  
Plane Bending
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