Effect of loading frequency on fatigue crack growth under high temperature

Qian, Zhendong; Takezono, Shigeo; Tao, Katsumi

doi:10.1016/0020-7683(95)00201-4

Cited by 6 publications

(5 citation statements)

References 15 publications

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“…The strains local to a crack tip are of multiaxial nature such that an equivalent strain, which accounts for all strain components, is often adopted as a damage parameter (e.g., Riedel and Rice, 1980;Ritchie and Thompson, 1985;Yatomi, 2003;Zhao et al, 2006). In the current work, however, only the strain component normal to the crack growth plane was considered, as it is most relevant to material separation in mode I, and it also coincides with the maximum principal strain (Qian et al, 1996). As proposed by Kapoor (1994), two modes of failure may be identified in ductile fatigue rupture: low cycle fatigue (LCF) and ratchetting.…”

Section: Discussionmentioning

confidence: 98%

“…Sung and Liou (1993) analytically studied the near-tip fields for transient crack growth in a viscoplastic solid under small-scale yielding conditions, where the crack tip fields were shown to depend on both time and crack propagation speed. Experimental and numerical work by Qian et al (1996) showed marked effects of loading frequency on crack growth rate, stresses and viscoplastic strains. Anderson et al…”

Section: Introductionmentioning

confidence: 99%

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A viscoplastic study of crack-tip deformation and crack growth in a nickel-based superalloy at elevated temperature

Tong

2008

Journal of the Mechanics and Physics of Solids

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Citation: ZHAO, L. and TONG, J., 2008. A viscoplastic study of crack-tip deformation and crack growth in a nickel-based superalloy at elevated temperature. Journal of the Mechanics and Physics of Solids, 56 (12), Additional Information:• This is the author's version of a work that was accepted for publication in the Journal of the Mechanics and Physics of Solids. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subse- AbstractViscoplastic crack tip deformation behaviour in a nickel-based superalloy at elevated temperature has been studied for both stationary and growing cracks in a compact tension (CT) specimen using the finite element method. The material behaviour was described by a unified viscoplastic constitutive model with non-linear kinematic and isotropic hardening rules, and implemented in the finite element software ABAQUS via a userdefined material subroutine (UMAT). Finite element analyses for stationary cracks showed distinctive strain ratchetting behaviour near the crack tip at selected load ratios, leading to progressive accumulation of tensile strain normal to the crack growth plane.Results also showed that low frequencies and superimposed hold periods at peak loads significantly enhanced strain accumulation at crack tip. Finite element simulation of crack growth was carried out under a constant ∆K-controlled loading condition, again ratchetting was observed ahead of the crack tip, similar to that for stationary cracks.A crack growth criterion based on strain-accumulation is proposed where a crack is assumed to grow when the accumulated strain ahead of the crack tip reaches a critical value over a characteristic distance. The criterion has been utilised in the prediction of crack growth rates in a CT specimen at selected loading ranges, frequencies and dwell periods, and the predictions were compared with the experimental results.

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Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

A viscoplastic study of crack-tip deformation and crack growth in a nickel-based superalloy at elevated temperature

Tong

2008

Journal of the Mechanics and Physics of Solids

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“…The strains local to a crack tip are of multiaxial nature such that an equivalent strain, which accounts for all strain components, is often adopted as a damage parameter [23,24]. In the current work, however, only the strain component normal to the crack growth plane was considered, as it is most relevant to material separation in mode I, and it also coincides with the maximum principal strain [25].…”

Section: Discussionmentioning

confidence: 99%

Ratchetting strain as a driving force for fatigue crack growth

Tong

Lin

2013

International Journal of Fatigue

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“…According to a large number of test results, loading amplitude, loading sequence, environment, and loading frequency all have effects on the FCG. As shown in Figure and Table , with the increase of crack length, the crack growth rate decreases at first and then increases.…”

Section: Resultsmentioning

confidence: 99%

Experimental study on acoustic emission characteristic of fatigue crack growth of self-compacting concrete

Chen

Guo

2019

Struct Control Health Monit

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Summary In order to study the fatigue crack growth (FCG) of self‐compacting concrete, in this paper, the 100 mm × 100 mm × 400 mm specimens with a 30‐mm initial notch were used for three‐point bending test under three different stress levels (0.75, 0.8, and 0.85) and three different loading frequencies (0.5, 1, and 2 Hz), and the acoustic emission (AE) technique was used for monitoring the FCG. According to the results, the changes of the crack mouth opening displacement, the stiffness, and the effective crack length all present three obvious stages with the increase of fatigue cycles. According to Paris law, under the same stress level, the increase of loading frequency results in the increase of fatigue life and the decrease of FCG rate, but the curves of da/dN are approximately parallel under different loading frequencies. Furthermore, the research results of characteristic parameters of AE show that cumulative hits, counts and energy show three stages, which are similar to the change of stiffness, and there is a failure point in the curves of cumulative counts and cumulative energy. The cumulative laws of hits and counts can be used to well describe the FCG, and the b value can be used to analyze the three stages of fatigue fracture. Therefore, the AE technology can be used to monitor the FCG in concrete engineering.

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Effect of loading frequency on fatigue crack growth under high temperature

Cited by 6 publications

References 15 publications

A viscoplastic study of crack-tip deformation and crack growth in a nickel-based superalloy at elevated temperature

A viscoplastic study of crack-tip deformation and crack growth in a nickel-based superalloy at elevated temperature

Ratchetting strain as a driving force for fatigue crack growth

Experimental study on acoustic emission characteristic of fatigue crack growth of self-compacting concrete

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