Near-threshold fatigue: a review

Lawson, L.; Chen, E.Y.; Meshii, M.

doi:10.1016/s0142-1123(99)00053-5

Cited by 116 publications

(49 citation statements)

References 102 publications

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“…A summary of the main mechanisms observed in tortuous cracks is given in Fig. 1a, [5]. RICC limits the minimum stress intensity, hook or 'lock-up' mechanisms limit the maximum stress intensity and branching produces true elastic shielding, [1].…”

Section: Fatigue Crack Pathsmentioning

confidence: 99%

“…a) scheme of possible mechanisms attending near-threshold fatigue crack growth, [5] b) magnified view of crack path in coarse-grained magnesium alloy.…”

Section: Fatigue Crack Pathsmentioning

confidence: 99%

“…It will be shown in a subsequent section that crack growth through the microstructure involved significant rate irregularities, which show up also in the present plot. It is known that low R-ratios and near-threshold conditions may favor the development of RICC and oxide-induced crack closure (OICC) mechanisms rather than Elber's plasticityinduced crack closure (PICC), [1,5]. Therefore crack opening load levels during the fatigue tests were determined according to the practice of ASTM E -647 from the specimen compliance loop in a loading cycle.…”

Section: Fatigue Crack Growth Ratesmentioning

confidence: 99%

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Fatigue crack paths in coarse‐grained magnesium

Nicoletto

Konečná

Pirondi

2004

Fatigue Fract Eng Mat Struct

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Section: Fatigue Crack Pathsmentioning

confidence: 99%

“…a) scheme of possible mechanisms attending near-threshold fatigue crack growth, [5] b) magnified view of crack path in coarse-grained magnesium alloy.…”

Section: Fatigue Crack Pathsmentioning

confidence: 99%

Section: Fatigue Crack Growth Ratesmentioning

confidence: 99%

See 1 more Smart Citation

Fatigue crack paths in coarse‐grained magnesium

Nicoletto

Konečná

Pirondi

2004

Fatigue Fract Eng Mat Struct

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“…It is of great significance to obtain fatigue crack growth data in the near-threshold regime both for the life prediction of components and for the optimization of design of engineering structures. In the near-threshold regime, fatigue crack growth may be affected by microstructure, load ratio and environment (Ritchie 1979;Sadananda 1984;Lawson et al 1999). Since crack closure was reported by Elber (1970), the mechanism of microstructure-sensitive fatigue crack propagation has been explained by roughness-induced crack closure (RICC) (Ritchie and Suresh 1982), plasticity-induced crack closure (PICC) and oxide-induced crack closure (OICC) (Taylor 1989;Suresh 1998).…”

Section: Introductionmentioning

confidence: 99%

Effect of microstructure on appearance of near-threshold fatigue fracture in Cr–Mo–V steel

Zhu

Xuan

2009

Int J Fract

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Near-threshold fatigue crack growth behavior in 25Cr2NiMo1V steel with different microstructures was investigated by utilizing the load-shedding technique at ambient temperature. Crack surface morphology was observed by SEM with special emphases on the incidence of intergranular fracture and the influence on crack growth rates. Results show that the maximum intergranularity occurs at the K corresponding to the cyclic plastic zone size being equivalent to the prior austenitic grain size. Two types of crack growth mode were observed in the near-threshold regime, i.e., the crystallographic mode of crack growth and the striation mode of crack advance. The incidence of faceted fracture was mainly rationalized by comparing the cyclic plastic zone size with the grain size. It is concluded that, in the crystallographic mode, lower crack growth rates in samples with higher heat treatment temperatures are caused by a greater degree of roughness-induced crack closure (RICC), faceted fracture induced crack closure (FFICC), and oxide-induced crack closure (OICC). The faceted fracture shows negligible influence on crack growth rates when cracks grow in a striation controlled mode.

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“…Garrett (1982) [13] 의 slender rod 이론을 통해 수립한 지배 미분방정식을 기본으로 하여 수행이 가능하다. Gerber의 응력모델을 본 연구에서는 적용한다 [14], [15] . [16], [17] .…”

Section: 다고 알려져 있다unclassified

Investigation of Fatigue Damage of the Mooring Lines for Submerged Floating Tunnels Under Irregular Waves

Kim¹,

Won²

2017

Journal of Korean Society of Steel Construction

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-As well as the strength check, fatigue life check is also mainly required for designing mooring lines of the floating structures. In general, forces which induce dynamic structural response significantly affect to fatigue design of the mooring lines. So, waves are mainly considered as the governing loading for fatigue design of the mooring lines. In this study, characteristics of the fatigue damage of the mooring lines for submerged floating tunnels (SFT) under irregular waves are investigated. For this study time domain hydrodynamic analysis is used to obtain motion of the tunnel and tension and stresses of the mooring lines under the specific environmental conditions. Also, the Rainflow-counting method, the Palmgren-Miner's rule, and S-N curves for floating offshore structures presented by DNV recommendation is applied to calculate the fatigue damage due to the fluctuating stresses. Referring to the design plactice of the tendon pipes for TLP (tension-leg platform), which is very similar structural system to SFT, it is assumed that a 100 year return period wave attacks the SFT systems during 48 hours and the fatigue damages due to the environmental loading are calculated. Following the analysis sequence, the effects of the tunnel draft, spacing and initial inclination angle of the mooring lines on the fatigue damage under the specific environmental loadings are investigated. .

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Near-threshold fatigue: a review

Cited by 116 publications

References 102 publications

Fatigue crack paths in coarse‐grained magnesium

Fatigue crack paths in coarse‐grained magnesium

Effect of microstructure on appearance of near-threshold fatigue fracture in Cr–Mo–V steel

Investigation of Fatigue Damage of the Mooring Lines for Submerged Floating Tunnels Under Irregular Waves

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