RETROSPECTIVE VIEW ON THE ROLE OF THE PLASTIC ZONE AT A FATIGUE CRACK TIP

1996 ◽  
Vol 19 (11) ◽  
pp. 1301-1306 ◽  
Author(s):  
C. Bathias
Keyword(s):  
Fatigue Crack ◽  
Plastic Zone ◽  
Crack Tip ◽  
Retrospective View

Plastic Strain Distribution at the Tips of Propagating Fatigue Cracks

1976 ◽  
Vol 98 (1) ◽  
pp. 24-29 ◽  
Author(s):  
D. L. Davidson ◽  
J. Lankford
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Crack ◽  
Plastic Strain ◽  
Plastic Zone ◽  
Strain Distribution ◽  
Dimensionless Parameter ◽  
Fatigue Cracks ◽  
Crack Tip ◽  
Cyclic Plastic Zone ◽  
Plastic Zones

The techniques of selected area electron channeling and positive replica examination have been used to study the plastic zones attending fatigue crack propagation in 304 SS, 6061-T6 aluminum alloy, and Fe-3Si steel. These observations allowed the strain distribution at the crack tip to be determined. The results indicate that the concepts of a monotonic and a cyclic plastic zone are essentially correct, with the strains at demarcation between these two zones being 3 to 6 percent. Strain distribution varies as r−1/2 in the cyclic zone and as ln r in the monotonic plastic zone. The strain distributions for all materials studied may be made approximately coincident by using a dimensionless parameter related to distance from the crack tip.

Role of crack tip plasticity in fatigue crack growth

2001 ◽  
Vol 81 (5) ◽  
pp. 1283-1303 ◽  
Author(s):  
K. Sadanandaa, Dorai-Nirmal V. Ramaswamy
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Crack Tip ◽  
Crack Tip Plasticity

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.

Higher-harmonic imaging of the plastic zone in front of a fatigue crack tip

2014 ◽  
Vol 53 (7S) ◽  
pp. 07KC04 ◽  
Author(s):  
Koichiro Kawashima ◽  
Takumi Aida ◽  
Hazime Yasui
Keyword(s):  
Fatigue Crack ◽  
Plastic Zone ◽  
Crack Tip ◽  
Harmonic Imaging ◽  
Higher Harmonic
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