A study on the impact fatigue crack propagation into the welding residual stresses field

1983 ◽  
Vol 23 (4) ◽  
pp. R151-R154
Author(s):  
R. Murakami ◽  
K. Akizono
Keyword(s):  
Fatigue Crack ◽  
Residual Stresses ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Impact Fatigue ◽  
The Impact

Effect of Residual Stresses on the Fatigue Crack Propagation in Welded Joints

2005 ◽  
Vol 2 (3) ◽  
pp. 12036 ◽  
Author(s):  
N Gubeljak ◽  
J Predan ◽  
R Pippan ◽  
M Oblak
Keyword(s):  
Fatigue Crack ◽  
Residual Stresses ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Welded Joints

Influence of Residual Stresses on Fatigue Crack Propagation in Pearlitic Cold-Drawn Steel Wires

2011 ◽  
Vol 681 ◽  
pp. 229-235 ◽  
Author(s):  
Roberto Brighenti ◽  
Andrea Carpinteri ◽  
Sabrina Vantadori
Keyword(s):  
Residual Stress ◽  
Fatigue Crack ◽  
Residual Stresses ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Notch Root ◽  
Steel Wire ◽  
Cold Drawing ◽  
Reduced Cross Section ◽  
Cyclic Tension

The aim of the present paper is to evaluate the effect of residual stresses, due to cold-drawing process, on the fatigue crack propagation in a pearlitic steel wire with a V-shaped circumferential notch. In order to analyse the effect of the notch severity on the residual stress distribution, three different values of the notch root radius are examined. The residual stress distributions in the reduced cross-section of such wires are numerically evaluated through FE analyses which simulate the material removing operation in the notched region. The stress-intensity factors (SIFs) related to tension loading and residual stresses are computed. Then, the crack propagation under cyclic tension combined with the residual stresses is analysed by taking into account the above SIF values and the actual stress ratio, which is different from that due to cyclic tension only.

Measurement of Stress Distribution Near Fatigue Crack in Ultra-Fine Grained Steel by Synchrotron Radiation

2005 ◽  
Vol 490-491 ◽  
pp. 118-123 ◽  
Author(s):  
Yoshiaki Akiniwa ◽  
Keisuke Tanaka ◽  
Hidehiko Kimura
Keyword(s):  
Fatigue Crack ◽  
Synchrotron Radiation ◽  
Stress Distribution ◽  
Residual Stresses ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Crack Closure ◽  
Experimental Result ◽  
Ultrafine Grained ◽  
Ultrafine Grained Steel

Single-edge-notched specimens of ultrafine-grained steel were fatigued. The mean grain size of the steel is about 2 micrometers. Propagation behavior of fatigue cracks was observed with the crack closure. The resistance of the crack propagation of ultrafine-grained steel was larger than that of conventional steels. The crack closure acted as an important role for the larger resistance of fatigue crack propagation. After fatigue tests, stress distribution near the fatigue crack was measured by monochromatic X-rays from synchrotron radiation. The irradiated area was 100 µm x 100 µm. Residual and loading stress distributions ahead of the crack tip and on the crack wake was measured at the maximum stress intensity factor and zero applied load. The stress was determined by sin2ψ method. The measured stress was compared with the value calculated by FEM and the fatigue crack propagation model. The stress distribution at the maximum load and residual stresses agreed very well with the calculated results. The crack opening stress calculated by the residual stresses agreed with the experimental result.

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