... to the autofrettage process allow a higher operational pressure in the vessel and decrease the cylinder’s susceptibility to possible inner cracking by impeding crack initiation, further slowing down fatigue crack growth and thus extending the pressure vessel’s fatigue life. In this study, we attempt...

...Shinji Konosu; Kyosuke Kasahara It is generally believed that multiple fatigue crack growth prediction is difficult with the use of conventional stress intensity factor (SIF) solution calculations because of issues such as SIF magnification and shielding effects. Therefore, almost all the existing...

... considered here. Hence, the leakage was caused by low-cycle fatigue with small-scale yielding. The procedure used to make predictions of low-cycle fatigue crack growth with small-scale yielding was based on the Dowling ΔJ procedure, which is an extension of linear-elastic fatigue crack growth methodology...

... different types and dimensions of part-through slot in the defective pipeline are investigated. The maximum plastic strain range over the steady cycle with different cyclic loading combinations is evaluated for a low cycle fatigue assessment. The location of the initiation of a fatigue crack...

... high vibrational bending stresses and corrosive agents. It was shown that the role of a vibrational bending stress due to high velocity of input steam is very impressive. The important point in this study was the branching of corrosion fatigue cracks during their growth in presence of NaOH and chloride...

...Feng Ju; John Aumuller; Zihui Xia; Pierre Du Plessis Coke drums are critical equipment in the petroleum industry. The failure modes of coke drums include excessive bulging deformation and fatigue cracking. The elastic-plastic behavior of a coke drum, subjected to both thermal and mechanical...

...A. N. Shuaib; O. M. Duffuaa; N. Merah; Y. Al-Nassar Heat exchanger tube rolling introduces tensile residual stresses in the expanded part of the tube and the transition zone between the expanded and unexpanded regions of the tube. These tensile residual stresses accelerate fatigue crack initiation...

... is provided in order to facilitate the numerical integration of the propagation law during a fatigue crack growth analysis. This set of equations avoids the use of tabulated values, usually available in the main design codes, for fatigue analysis, considering the crack aspect ratio evolution during...

... within a factor of 2. Comparison between the measured CCD observation cycle number N III and the predicted cycle N c from load-cycle curve (0.3% and 0.5% strain amplitude) fatigue cracks fatigue testing geometry plates (structures) stainless steel temperature...

... of the critical flaw sizes for each cylinder by adjusting for fatigue crack growth that may occur during the use of the cylinder. Finally, the “acceptance/rejection criteria” is established to take into account other factors, such as all the expected operating conditions that the cylinders may see in service...

... of heavy-section low-alloy steel plates, forgings, and welds, including metallurgical studies, mechanical properties, fracture toughness (quasi-static and dynamic), fatigue crack-growth, and crack-arrest toughness. Also included were irradiation effects studies, thermal shock analyses, testing of thick...

...S. Alavudeen; C. V. Krishnamurthy; Krishnan Balasubramaniam; D. M. Pugazhendhi; G. Raghava; P. Gandhi The determination of depth profile of vertical fatigue cracks generated in thick cruciform samples using an ultrasonic phased array is investigated in this paper. The cracks were formed...

... Simulation of Variable Amplitude Fatigue Crack Initiation Behaviour Using a New Strain-Based Cumulative Damage Model ,” Int. J. Fatigue 0142-1123 , 24 , pp. 977 – 986 . 10.1016/S0142-1123(02)00007-5 DuQuesnay , D. L. , Topper , T. H. , Yu , M. T. , and Pompetzki , M...

... finite element analysis. The testing shows that expanding, in addition to welding, may slightly enhance the fatigue strength of a welded joint. From a microscopic view, the fatigue crack begins at the half melt coarse grain zone of the welded seam on the outer wall of tube and then propagates to the zone...

... in area, threshold stress intensity factor, fracture toughness, and fatigue crack growth. These properties are from literature sources under a variety of test methods and conditions. The collection of literature data is by no means complete, but the diversity of data and dependency of results on test...

.... 157–162 ), which hereafter is called as steady state. If one is interested in fatigue crack growth (assuming Paris law) under this thermal stress, because the SIF range soon converges to a constant, it seemed important to know the maximum value of the steady state SIF range for a given cylinder...

...Hyeong-Yeon Lee; Jae-Han Lee; Kamran Nikbin Creep-fatigue crack behavior has been investigated for a welded component with 316L stainless steel and Mod. 9Cr–1Mo steel through assessment and test. The evaluation of creep-fatigue crack initiation and propagation was carried out for 316L stainless...

...William J. O’Donnell; William John O’Donnell; Thomas P. O’Donnell High temperature ( > 300 ° F , 149 ° C ) water has been found to greatly accelerate fatigue crack growth rates in carbon and low-alloy steels. Current ASME Code fatigue design curves are based entirely on data obtained in air...

.... The existing fatigue ε - N data have been evaluated to identify the various material, environmental, and loading parameters that influence fatigue crack initiation and to establish the effects of key parameters on the fatigue life of these steels. Statistical models are presented for estimating fatigue life...

... with the experiments in terms of fatigue life. The predicted cracking directions by the criteria were less satisfactory when comparing with the experimentally observed cracking behavior under different loading conditions. 27 02 2007 18 07 2007 11 12 2008 alloy steel fatigue cracks fracture...