scholarly journals Investigation of Energy Dissipation and Plastic Zone Size During Fatigue Crack Propagation in a High-Alloyed Steel

2014 ◽  
Vol 3 ◽  
pp. 408-413 ◽  
Author(s):  
Jürgen Bär ◽  
Stefan Seifert
Keyword(s):  
Fatigue Crack ◽  
Energy Dissipation ◽  
Plastic Zone ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Plastic Zone Size ◽  
Alloyed Steel ◽  
Zone Size ◽  
High Alloyed Steel

Analytical Prediction Model for Fatigue Crack Propagation Rate under Tension-Compression Loading

2013 ◽  
Vol 842 ◽  
pp. 455-461
Author(s):  
Yu Sha ◽  
Shi Gang Bai ◽  
Ya Hui Wang
Keyword(s):  
Finite Element ◽  
Fatigue Crack ◽  
Plastic Zone ◽  
Crack Propagation ◽  
Compressive Stress ◽  
Fatigue Crack Propagation ◽  
Crack Tip ◽  
Plastic Zone Size ◽  
Zone Size ◽  
Compression Loading

Elastic–plastic finite element analyses have been performed to study the compressive stress effect on fatigue crack growth under applied tension–compression loading. The near crack tip stress, crack tip opening displacement and crack tip plastic zone size were obtained for a kinematic hardening material. The results have shown that the near crack tip local stress, displacement and reverse plastic zone size are controlled by the maximum stress intensity factors Kmax and the applied compressive stress σmaxcom under tension–compression. Based on the finite element analysis results, a fatigue crack propagation model using Kmax and σmaxcom as a parameters under tension–compression loading has been developed.The models under tension–compression loading agreed well with experimental observations.

Research on fatigue crack propagation of micro-alloyed steel by acoustic emission

2015 ◽  
Vol 19 (sup5) ◽  
pp. S5-420-S5-422 ◽  
Author(s):  
H. W. Wang ◽  
H. Q. Xiao ◽  
H. Bai ◽  
H. Bai ◽  
Z. Y. Han ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Alloyed Steel ◽  
Micro Alloyed Steel

The study of a fatigue crack propagation in titanium Grade 2 using analysis of energy dissipation and acoustic emission data

2019 ◽  
Vol 210 ◽  
pp. 312-319 ◽  
Author(s):  
A.N. Vshivkov ◽  
A. Yu. Iziumova ◽  
I.A. Panteleev ◽  
A.V. Ilinykh ◽  
V.E. Wildemann ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Fatigue Crack ◽  
Energy Dissipation ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Emission Data ◽  
Titanium Grade

50-Fold Difference in Region-II Fatigue Crack Propagation Resistance of Titanium Alloys: A Grain-Size Effect

1979 ◽  
Vol 101 (1) ◽  
pp. 86-90 ◽  
Author(s):  
G. R. Yoder ◽  
L. A. Cooley ◽  
T. W. Crooker
Keyword(s):  
Grain Size ◽  
Fatigue Crack ◽  
Crack Propagation ◽  
Crack Growth ◽  
Fatigue Crack Propagation ◽  
Load Ratio ◽  
Plastic Zone Size ◽  
Crack Propagation Resistance ◽  
Order Of Magnitude ◽  
Region Ii

Fatigue crack growth rates (da/dN) in ambient laboratory air have been determined for a wide variety of materials from four basic α + β titanium alloy systems. Each material was cyclically loaded with a haversine waveform and a load ratio, R = 0.10. The results indicate that, at a constant value of stress-intensity range (ΔK), the width of the da/dN data band exceeds an order of magnitude. For example, at ΔK = 21 MPa·m1/2, a 50-fold difference in fatigue crack propagation rates is observed. Analysis of the crack growth rate data at this point indicates a systematic dependence on grain size (l), viz. that da/dN decreases with increasing l. An interpretation of this effect is offered in terms of reversed (cyclic) plastic zone size considerations.

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