Fatigue growth of short cracks in Ti-17: Experiments and simulations

Cadario, Alessandro; Alfredsson, Bo

doi:10.1016/j.engfracmech.2006.11.016

Cited by 27 publications

(19 citation statements)

References 12 publications

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“…Note that the non-linear crack tip parameters parameters (DCTOD, cyclic plastic zone size), and also DJ, usually replace K in situations such that LEFM fails to describe fatigue crack growth [81]. It is interesting to note that the residual stresses ahead of crack tip are widely mentioned in literature.…”

Section: Identification Of Crack Tip Parametersmentioning

confidence: 99%

Effect of crack closure on non-linear crack tip parameters

Antunes

Sousa

Branco

et al. 2015

International Journal of Fatigue

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Crack closure concept has been widely used to explain different issues of fatigue crack propagation. However, some authors have questioned the relevance of crack closure and have proposed alternative concepts. The main objective here is to check the effectiveness of crack closure concept by linking the contact of crack flanks with non-linear crack tip parameters. Accordingly, 3D-FE numerical models with and without contact were developed for a wide range of loading scenarios and the crack tip parameters usually linked to fatigue crack growth, namely range of cyclic plastic strain, crack tip opening displacement, size of reversed plastic zone and total plastic dissipation per cycle were investigated. It was demonstrated that: (i) LEFM concepts are applicable to the problem under study; (ii) the crack closure phenomenon has a great influence on crack tip parameters decreasing their values; (iii) the ΔKeff concept is able to explain the variations of crack tip parameters produced by the contact of crack flanks; and (iv) the analysis of remote compliance is the best numerical parameter to quantify the crack opening level. Therefore the crack closure concept seems to be valid. Additionally, the curves of crack tip parameters against stress intensity factor range obtained without contact may be seen as master curves.

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Section: Identification Of Crack Tip Parametersmentioning

confidence: 99%

Effect of crack closure on non-linear crack tip parameters

Antunes

Sousa

Branco

et al. 2015

International Journal of Fatigue

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“…It can be seen that the scatter of crack growth rate at R = −1 seemed much larger than those at other stress ratios. 33 During the growth process of major cracks, they often coalesced with the micro cracks, thus resulting in a sudden increase in crack length and propagation rate.…”

Section: Effect Of Stress Ratio On Small Fatigue Crack Growth Ratementioning

confidence: 99%

Small fatigue crack growth behavior of titanium alloy TC4 at different stress ratios

Zhu

Jiang

et al. 2018

Fatigue Fract Eng Mat Struct

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In this paper, the small fatigue crack behavior of titanium alloy TC4 at different stress ratios was investigated. Single‐edge‐notch tension specimens were fatigued axially under a nominal maximum stress of 370 MPa at room temperature. Results indicate that fatigue cracks in TC4 initiate from the interface between α and β phases or within α phase. More than 90% of the total fatigue life is consumed in the small crack initiation and growth stages. The crack growth process of TC4 can be divided into three typical stages, ie, microstructurally small crack stage, physically small crack stage, and long crack stage. Although the stress ratio has a significant effect on the total fatigue life and crack initiation life at constant σmax, its effect on crack growth rate is indistinguishable at R = −0.1, 0.1, and 0.3 when crack growth rate is plotted as a function of ∆K.

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“…The cyclic plastic properties showed softening behaviour; see Ref. [16], when tested on specimens with circular cross‐sections, diameter 5 mm, and 20 mm test length. Figure 2a shows the stable hysteresis loops at 3, 4 and 5% total cyclic strain range.…”

Section: Fretting Experimentsmentioning

confidence: 99%

Influence of residual stresses from shot peening on fretting fatigue crack growth

Cadario

Alfredsson

2007

Fatigue Fract Eng Mat Struct

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A B S T R A C T One method to improve fretting fatigue life is to shot peen the contact surfaces. Experimental fretting life results from specimens in a Titanium alloy with and without shot peened surfaces were evaluated numerically. The residual stresses were measured at different depths below the fretting scar and compared to the corresponding residual stress profile of an unfretted surface. Thus, the amount of stress relaxation during fretting tests was estimated. Elastic-plastic finite element computations showed that stress relaxation was locally more significant than that captured in the measurements. Three different numerical fatigue crack growth models were compared. The best agreement between experimental and numerical fatigue lives for both peened and unpeened specimens was achieved with a parametric fatigue growth procedure that took into consideration the growth behaviour along the whole front of a semi-elliptical surface crack. Furthermore, the improved fretting fatigue life from shot peening was explained by slower crack growth rates in the shallow surface layer with compressive residual stresses from shot peening.The successful life analyses hinged on three important issues: an accurate residual stress profile, a sufficiently small start crack and a valid crack growth model.

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Fatigue growth of short cracks in Ti-17: Experiments and simulations

Cited by 27 publications

References 12 publications

Effect of crack closure on non-linear crack tip parameters

Effect of crack closure on non-linear crack tip parameters

Small fatigue crack growth behavior of titanium alloy TC4 at different stress ratios

Influence of residual stresses from shot peening on fretting fatigue crack growth

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