How to get a correct estimate of the plastic zone size for shear-mode fatigue cracks?

2019 ◽  
Vol 104 ◽  
pp. 102332 ◽  
Author(s):  
Tomáš Vojtek ◽  
Miroslav Hrstka
Keyword(s):  
Plastic Zone ◽  
Fatigue Cracks ◽  
Plastic Zone Size ◽  
Shear Mode ◽  
Zone Size ◽  
Correct Estimate

Verification of Linear Dependence of Plastic Zone Size on J-Integral for Mixed-Mode Loading

2015 ◽  
Vol 751 ◽  
pp. 15-20 ◽  
Author(s):  
Stanislav Žák ◽  
Jana Horníková ◽  
Pavel Šandera ◽  
Jaroslav Pokluda
Keyword(s):  
Plastic Zone ◽  
Crack Growth ◽  
Mixed Mode ◽  
Plastic Zone Size ◽  
Small Scale ◽  
Shear Mode ◽  
Mode Ii ◽  
Zone Size ◽  
Shear Cracks ◽  
Loading Modes

Determination of fatigue crack growth characteristics under shear-mode loading is a rather complicated problem. To increase an efficiency and precision of such testing, special specimens enabling simultaneous propagation of shear cracks under II, III and II+III loading modes started to be used rather recently. However, a description of crack growth rate in terms of appropriate fracture mechanics quantities demands a precise assessment of plastic zone size under various shear-mode loading levels. This contribution is focused on the numerical elasto-plastic analysis of stress-strain field at the crack tip in specimens made of a pure polycrystalline (ARMCO) iron loaded by mixed mode II+III. The dependence of plastic zone size on theJ-integral value described the wide region of loading. The results reveal that formixed mode II+III the small scale yielding conditions are fulfilled in the region where plastic zone size is smaller than 1/10 of the total crack length.

A Study on the Cyclic Plastic Zone Size Method, ω*, for Digital Fatigue Life Prediction of Arc-Welded Joints

2003 ◽  
Author(s):  
Tomohiro Hirata ◽  
Toshiaki Nakamaru ◽  
Keisuke Toyama ◽  
Shuichi Magara ◽  
Hiroshi Watanabe ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Plastic Zone ◽  
Welded Joints ◽  
Life Prediction ◽  
Plastic Zone Size ◽  
Fatigue Life Prediction ◽  
Zone Size ◽  
Cyclic Plastic ◽  
Cyclic Plastic Zone

A Method for the Analysis of the Growth of Short Fatigue Cracks

1995 ◽  
Vol 117 (4) ◽  
pp. 408-411 ◽  
Author(s):  
A. J. McEvily ◽  
Y.-S. Shin
Keyword(s):  
Experimental Data ◽  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Fatigue Cracks ◽  
Material Constant ◽  
Plastic Zone Size ◽  
Surface Cracks ◽  
Zone Size ◽  
Short Cracks

A method for the analysis of the fatigue crack growth rate for short cracks has been developed and is applied to the case of fatigue crack growth of short surface cracks in a 1045 carbon steel. The method entails three modifications to standard LEFM procedures. These modifications include the use of a material constant to bridge between smooth and cracked specimen behavior, consideration of the plastic zone size to crack length ratio, and incorporation of the development of crack closure. Comparisons are made between calculations based upon this approach and experimental data.

Inclusion Effect on The Plastic Zone Size in Confined Plasticity

2008 ◽  
pp. 407-408
Author(s):  
M. Benguediab ◽  
M. Elmegueni ◽  
M. Nait-Abdelaziz ◽  
A. Imad
Keyword(s):  
Plastic Zone ◽  
Plastic Zone Size ◽  
Zone Size
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