Surface small crack growth behaviour in low-cycle fatigue at elevated temperature and application limit of macroscopic crack growth lawOkazaki, M., Yada, T. and Endoh, T. Nucl. Eng. Des. Jan. (II) 1989 111, (1), 123–134

1989 ◽  
Vol 11 (4) ◽  
pp. 286-286
Keyword(s):  
Elevated Temperature ◽  
Crack Growth ◽  
Low Cycle Fatigue ◽  
Small Crack ◽  
Cycle Fatigue ◽  
Growth Behaviour ◽  
Crack Growth Behaviour ◽  
Small Crack Growth ◽  
Macroscopic Crack ◽  
Application Limit

Evaluation of Internal Small Crack Growth Properties of Ductile Cast Iron in Low Cycle Fatigue

2000 ◽  
Vol 2000.3 (0) ◽  
pp. 277-278
Author(s):  
Takeshi TOMINAGA ◽  
Yousuke Wakabayashi ◽  
Yoshihito KUROSHIMA ◽  
Syoji HARADA
Keyword(s):  
Cast Iron ◽  
Crack Growth ◽  
Low Cycle Fatigue ◽  
Ductile Cast Iron ◽  
Small Crack ◽  
Cycle Fatigue ◽  
Growth Properties ◽  
Small Crack Growth

scholarly journals Simulation of fatigue small crack growth in additive manufactured Ti–6Al–4V material

2020 ◽  
Vol 32 (6) ◽  
pp. 1745-1761 ◽  
Author(s):  
A. Gupta ◽  
W. Sun ◽  
C. J. Bennett
Keyword(s):  
Cyclic Loading ◽  
Crack Growth ◽  
Prediction Method ◽  
Small Crack ◽  
Test Results ◽  
Growth Data ◽  
Growth Behaviour ◽  
Crack Growth Behaviour ◽  
Small Crack Growth ◽  
Number Of Cycles

Abstract Additive manufacturing (AM) offers design freedom and ability to fabricate parts of complex shapes which are not often possible with the conventional methods of manufacturing. In an AM part, even with optimum build parameters, a complete elimination of defects is not possible and this makes it hard to fully deploy the AM technology to build load bearing parts operating under cyclic loading conditions. Many of these defects are < 1 mm in size and are categorised as ‘small cracks’. Local interaction of cracks with microstructural features and closure effects at the wake of the crack tip are some of the factors which make the growth behaviour of small and long cracks different. A crack growth life prediction method, which effectively considers the small crack growth behaviour, has been discussed in this paper. This proposed method includes a detailed finite element-based crack growth simulation using the ANSYS SMART fracture technology. The lifing calculations utilise the modified NASGRO equation and small crack growth data which was obtained from the published long crack growth data, corrected for closure effects. The predicted stress versus number of cycles curves were compared against the fatigue test results for the AM specimens in Ti–6Al–4V material. A good correlation between the predictions and test results suggests that the proposed method can be used to assess the small crack growth life of AM parts where the fatigue effects of cyclic loading can be quite significant.

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