Fatigue crack initiation behavior in embrittled austenitic–ferritic stainless steel

Sahu, J.K.; Krupp, Ulrich; Christ, H.‐J.

doi:10.1016/j.ijfatigue.2012.06.018

Cited by 24 publications

(16 citation statements)

References 18 publications

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“…However, the conventional element is still used at the outer side of the singular element. The singularity isoparametric element method is adopted in this paper, that is, by moving the midside-node of the 8-node isoparametric element from the normal position to 1/4 of side length, the stress singularity occurs near the angular point, as shown in section (2) in Fig. (6).…”

Section: The Crack Tip Stress Singularitymentioning

confidence: 99%

“…Fatigue crack initiation and propagation in the material or structure occur when they are subjected to alternating loading, and also can result in material fatigue failure [1][2][3]. Nowadays, the fatigue failure cannot be completely studied by the effective theoretical method, so, the specific materials for fatigue crack propagation test have acquired considerable importance for studying the fracture mechanism.…”

Section: Introductionmentioning

confidence: 99%

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The Variation Law of Mechanical Parameters of Type I Fatigue Crack Tip Under High Frequency Resonant Loading

Gao¹,

Huan-Bin²,

Xin-Guo³

et al. 2015

TOMEJ

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This work explores the variation law of mechanical parameters at fatigue crack tip of compact tension specimen with type I pre-notch based on dynamic finite element method (FEM) in the high frequency resonant fatigue crack propagation test. The displacement fields, the strain fields and the stress intensity factors (SIF) at CT specimen fatigue crack tip in one stress cycle and at different crack lengths under constant amplitude high frequency sinusoidal alternating loading condition are calculated and the related variation laws of mechanical parameters are analyzed. In order to calculate the dynamic SIF at fatigue crack tip, the static SIF has been calculated first. The compared results of the static finite element analysis with the theoretical calculation show that finite element modeling and calculating method and respective results are accurate. Secondly, the variation law of SIF at crack tip during the process of fatigue crack propagation test is studied by dynamic FEM. Finally, the high frequency resonant fatigue crack propagation test has been performed and the dynamic strain gauge is used to measure the strain at crack tip during one stress cycle. The research results show that during crack stable propagation stage, the displacement, strain and SIF at type I fatigue crack tip are in the same form having high frequency resonant load, and the displacement, strain and SIF amplitude increase with the crack growth. The error of static SIF between the calculated result by FEM and the theoretical result is 2.51%. The maximum error of the strain at crack tip between the FEM calculating result and the experimental result is 2.93%.

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Section: The Crack Tip Stress Singularitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Variation Law of Mechanical Parameters of Type I Fatigue Crack Tip Under High Frequency Resonant Loading

Gao¹,

Huan-Bin²,

Xin-Guo³

et al. 2015

TOMEJ

View full text Add to dashboard Cite

show abstract

“…However, Llanes et al considered that the effects of thermal aging on the cyclic deformation mechanisms of a duplex stainless steel were strongly related to the plastic strain amplitude [22]. The investigation of fatigue crack initiation behavior in SAF 2205 DSS (aged at 475 • C for 100 h) indicated that the intersection of slip markings and phase boundaries were the triggering points of fatigue crack initiation [23]. Marrow et al considered that the fatigue crack propagation in a thermally aged duplex is associated with the cleavage…”

Section: Introductionmentioning

confidence: 99%

Effects of Thermal Aging on the Low Cycle Fatigue Behaviors of Cast Duplex Stainless Steels

Wang

2019

Metals

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The low cycle fatigue (LCF) behaviors of cast duplex stainless steel (CDSS) thermally aged at different times were investigated under different strain amplitudes. The effects of thermal aging on the LCF lives of CDSS are closely related to the strain amplitude. At a low strain amplitude, the fatigue life of the material increases significantly after thermal aging, while the LCF life decreases with an increasing aging time at a high strain amplitude. After thermal aging at 400 °C for 10,000 h, the fatigue fracture morphologies of CDSS change from fatigue fringes to mixture features including fatigue fringes in austenite and cleavage cracks in ferrite. Severe plastic deformation in ferrite of the aged CDSS under a high strain amplitude causes the cleavage cracking of ferrite. The premature failure of ferrite accelerates the propagation of fatigue crack and shortens the fatigue life at a high strain amplitude.

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“…Fatigue cracks initiation and propagation in the metal materials or structures occur when they are subjected to alternating load and can result in material fatigue failure. Many studies show that a large number of fractures are closely related to the generation and propagation of fatigue cracks [1][2][3]. Nowadays, the fatigue failure cannot be completely studied by the effective theoretical method, so the specific material fatigue crack growth (FCG) tests have acquired considerable importance for studying the fracture mechanism.…”

Section: Introductionmentioning

confidence: 99%

Deformation Fields Measurement of Crack Tip under High‐Frequency Resonant Loading Using a Novel Hybrid Image Processing Method

Gao

Zhang

Jiang

et al. 2018

Shock and Vibration

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A novel hybrid image processing method is proposed to obtain the crack tip location, crack propagation path, displacement, strain fields, and plastic zone size of crack tip region under high-frequency resonant loading in this paper. An ordinary CCD camera is used to collect a series of crack images on one side of the compact tension (CT) specimen; meanwhile, a high-speed digital camera is used to acquire a series of digital speckle images of the other side of the specimen under the loading conditions at regular time intervals. Digital image processing (DIP) method is used to determine the macroscopic crack position. Digital image correlation (DIC) method is applied to obtain the displacement, strain fields, and plastic zone size of crack tip region. The characteristic digital speckle images of one stress cycle are obtained by data fitting and image matching method. Accordingly, the displacement/strain fields of crack tip region within one stress cycle and the displacement and strain amplitude fields with different crack lengths are obtained and analyzed. The obtained results are compared with the measured results of ordinary methods and show a good match. The success of this method will help to obtain better insight into and understanding of the fatigue and failure behavior of metal material with mode I crack under high-frequency resonant loading.

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Fatigue crack initiation behavior in embrittled austenitic–ferritic stainless steel

Cited by 24 publications

References 18 publications

The Variation Law of Mechanical Parameters of Type I Fatigue Crack Tip Under High Frequency Resonant Loading

The Variation Law of Mechanical Parameters of Type I Fatigue Crack Tip Under High Frequency Resonant Loading

Effects of Thermal Aging on the Low Cycle Fatigue Behaviors of Cast Duplex Stainless Steels

Deformation Fields Measurement of Crack Tip under High‐Frequency Resonant Loading Using a Novel Hybrid Image Processing Method

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