Fractography Study of the Mixed Mode Fatigue Crack Growth Process in Pressure Vessel P355NL1 Steel

2019 ◽  
Author(s):  
Grzegorz Lesiuk ◽  
Jose A. F. O. Correia ◽  
Michał Smolnicki ◽  
Wojciech Błażejewski ◽  
Mohamed El Amine Ben Seghier ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Fatigue Fracture ◽  
Pressure Vessel ◽  
Mixed Mode ◽  
Operating Conditions ◽  
Stress Effect ◽  
Loading Conditions ◽  
Stress States

Abstract The aim of the paper is to present a fatigue crack growth analysis thru a fractography study of different crack paths obtained in different operating conditions of the pressure vessel P355NL1 steel. All experiments were performed on CTS (Compact Tension Shear) specimens under the mixed mode (I+II) loading conditions. These stress states aim to reflect simple biaxiality stress states in a pressurized cylinder. In the experiments, different operating conditions were considered. Two different kinetic fatigue fracture diagrams were proposed for mixed mode fatigue crack growth rate estimation. The obtained results suggested a fact that energy approach describes synonymously the kinetics of fatigue crack growth under mixed mode loading conditions with respect to the mean stress effect – R-ratio. Finally, the fractography analysis sugessted that the fatigue fracture surface topography changes with the mixity level.

scholarly journals History effect in fatigue crack growth under mixed-mode loading conditions

2009 ◽  
Vol 31 (11-12) ◽  
pp. 1733-1741 ◽  
Author(s):  
P.Y. Decreuse ◽  
S. Pommier ◽  
L. Gentot ◽  
S. Pattofatto
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Mixed Mode ◽  
Loading Conditions ◽  
Mixed Mode Loading ◽  
History Effect

A Modified Compliance Method for Automatically Measuring Fatigue Crack Growth In Situ during Spectrum Fatigue Testing

2014 ◽  
Vol 891-892 ◽  
pp. 732-738
Author(s):  
Wyman Zhuang ◽  
Qian Chu Liu
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Operating Conditions ◽  
Loading Conditions ◽  
Variable Amplitude Loading ◽  
Variable Amplitude ◽  
Marker Band ◽  
Spectrum Loading

The fatigue critical structures of military aircraft are generally subjected to variable amplitude flight spectrum loading. Maintaining aircraft structural integrity to ensure safe operation of the fleet is critically dependent on accurate analysis and reliable prediction of fatigue crack growth in those structures under service operating conditions. To achieve this goal, laboratory experimental methods that can accurately measure and monitor fatigue crack growth under variable amplitude loading are required. This can be challenging as no test standard exists to guide the process of fatigue crack growth measurement under variable amplitude loading conditions to ensure the accuracy of the test results. This challenge was addressed by developing a modified compliance method as described in this paper. The results presented employed a modified compliance method complemented with a travelling microscope technique and marker band loads. The modified compliance method developed is able to measure in-situ, fatigue crack growth of standard compact-tension specimens under a fighter flight spectrum loading. The marker band loads and microscope readings were used to assist the post-test validation using quantitative fractography. The results from this study have demonstrated that the modified compliance method can produce consistent and accurate fatigue crack growth data under variable amplitude loading conditions.

Fatigue Crack Growth Simulation by Using S-Version FEM

2008 ◽  
Vol 385-387 ◽  
pp. 761-764
Author(s):  
Masanori Kikuchi ◽  
Yoshitaka Wada ◽  
Maigefeireti ◽  
Y. Li
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Mixed Mode ◽  
Crack Path ◽  
Loading Conditions ◽  
Mixed Mode Loading ◽  
Growth Simulation ◽  
Crack Growth Simulation ◽  
Curved Crack

Fatigue crack growth under mixed mode loading conditions is simulated using S-version FEM (Superposition FEM, S-FEM). By using S-FEM technique, only local mesh should be re-meshed and it becomes easy to simulate crack growth. By combining with re-meshing technique, local mesh is re-meshed automatically, and curved crack path is modeled easily.

Analysis of fatigue crack growth under mixed mode (I + II) loading conditions in rail steel using CTS specimen

2020 ◽  
Vol 109 ◽  
pp. 104354 ◽  
Author(s):  
Grzegorz Lesiuk ◽  
Michał Smolnicki ◽  
Rafał Mech ◽  
Anna Zięty ◽  
Cristiano Fragassa
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Mixed Mode ◽  
Rail Steel ◽  
Mode I ◽  
Loading Conditions
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