EVALUATION OF THE DRIVING FORCE IN FATIGUE CRACK GROWTH, IN PLANE STRAIN AND PLANE STRESS STATE TESTS, UNDER CONSTANT ΔK

2018 ◽  
Author(s):  
Julián Andrés Ortiz González ◽  
Jaime Tupiassú Pinho de Castro
Keyword(s):  
Fatigue Crack ◽  
Stress State ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Plane Strain ◽  
Plane Stress ◽  
Driving Force ◽  
Plane Stress State ◽  
State Tests

The Influence of Strain Conditions in Steel Samples on the Fatigue Crack Growth and Delay after Overload

2014 ◽  
Vol 224 ◽  
pp. 151-156
Author(s):  
Krzysztof Werner
Keyword(s):  
Growth Rate ◽  
Fatigue Crack ◽  
Stress State ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Strain State ◽  
Plane Stress State ◽  
Test Results ◽  
Single Overload ◽  
Flat Steel

The work presents the results of the analysis of fatigue crack growth in flat steel samples for different strain conditions on crack tip in the sample. Growth of fatigue crack in the samples was studied in conditions of a plane strain state, plane stress state and in the transitory zone between those states. Test results showed a clear influence of these conditions on the fatigue crack growth rate. The paper also includes the test results of effectiveness of retardation of fatigue crack growth after single overload cycles used in different strain conditions.

scholarly journals Can ?Keff be assumed as the driving force for fatigue crack growth?

2015 ◽  
Vol 9 (33) ◽  
pp. 97-104 ◽  
Author(s):  
J.T.P. Castro ◽  
M.A. Meggiolaro ◽  
J.A.O. González
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Driving Force

Numerical Simulation of Fatigue Crack Growth for Curved Cracks Emanating from Fastener Holes in Sheets by the MVCCI Method

2006 ◽  
Vol 324-325 ◽  
pp. 863-866
Author(s):  
Holger Theilig ◽  
M. Goth ◽  
Michael Wünsche
Keyword(s):  
Numerical Simulation ◽  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Plane Stress ◽  
Mixed Mode ◽  
Mixed Mode Loading ◽  
Multiple Crack ◽  
2D Structure ◽  
Predictor Corrector

The paper presents the results of a continued study of curved fatigue crack growth in a multiple arbitrarily pre-cracked isotropic sheet under plane stress loading. The predictor-corrector method (PCM) was extended in order to analyse the growth of multiple crack systems in a finite 2D structure. Together with the recently proposed improved modified virtual crack closure integral (MVCCI) method we can obtain accurate SIF values also for interacting cracks, and furthermore we can simulate fatigue crack growth of multiple crack systems in plane sheets under proportional mixed mode loading conditions. As a result, the program PCCS-2D is written to run within ANSYS to simulate interacting curved cracks. In order to check the accuracy and efficiency of the proposed method several example problems are solved. Especially curved cracks emanating from loaded fastener holes in sheets are analysed.

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