A threshold formula for fatigue crack growth with mean stress intensity factors

Cai, Xiao Jiang; Xia, Ri; Huo, Mingchen; Xu, Jin-Quan

doi:10.1016/j.ijmecsci.2017.12.014

Cited by 16 publications

(11 citation statements)

References 32 publications

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“…, 2013). The threshold formula of average SIF is deduced based on the fatigue limit condition of crack front (Cai et al. , 2018).…”

Section: Hot Spots and Problemsmentioning

confidence: 99%

Evaluation and prediction of material fatigue characteristics under impact loads: review and prospects

Liu

et al. 2022

IJSI

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PurposeThe properties of materials under impact load are introduced in terms of metal, nonmetallic materials and composite materials. And the application of impact load research in biological fields is also mentioned. The current hot research topics and achievements in this field are summarized. In addition, some problems in theoretical modeling and testing of the mechanical properties of materials are discussed.Design/methodology/approachThe situation of materials under impact load is of great significance to show the mechanical performance. The performance of various materials under impact load is different, and there are many research methods. It is affected by some kinds of factors, such as the temperature, the gap and the speed of load.FindingsThe research on mechanical properties of materials under impact load has the characteristics as fellow. It is difficult to build the theoretical model, verify by experiment and analyze the data accumulation.Originality/valueThis review provides a reference for further study of material properties.

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“…, 2013). The threshold formula of average SIF is deduced based on the fatigue limit condition of crack front (Cai et al. , 2018).…”

Section: Hot Spots and Problemsmentioning

confidence: 99%

Evaluation and prediction of material fatigue characteristics under impact loads: review and prospects

Liu

et al. 2022

IJSI

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“…Moreover, Table shows the increase in cationic species concentration after the oxidative dissolution, such as Ca 2+ and Mg 2+ , which may have a positive effect on the strength of hydration forces . If these forces work together, it may concentrate the stress on the crack tip and increase the stress intensity factor . Once the stress intensity factor is higher than the fracture toughness, it will cause the expansion and propagation of cracks.…”

Section: Discussionmentioning

confidence: 99%

“…31 If these forces work together, it may concentrate the stress on the crack tip and increase the stress intensity factor. 80 Once the stress intensity factor is higher than the fracture toughness, it will cause the expansion and propagation of cracks.…”

Section: Energy and Fuelsmentioning

confidence: 99%

Imbibition of Oxidative Fluid into Organic-Rich Shale: Implication for Oxidizing Stimulation

et al. 2018

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A large amount of fracturing fluid enters a well of a shale gas reservoir to create a fracture network, but the recovery of fracturing fluid is generally less than 30%. Fracturing fluid from the hydraulic fractures usually invades the microfractures and matrix by spontaneous imbibition during the shut-in. Recent studies show that the water–rock interaction may induce shale structure failures, which can significantly affect imbibition rate. Due to the presence of oxidizable compositions (e.g., pyrite and organic matter (OM)), oxidation easily induced the structure failures and dissolution pores. However, its effects on imbibition of water into the shale is poorly understood. In this study, imbibition experiments of deionized water (DI water) and oxidative fluid under no confining pressure conditions were conducted to determine the imbibition characteristics; shale cubes (1 cm × 1 cm × 1 cm) and crushed samples (380–830 μm) were treated by DI water and oxidative fluid for revelation of the change in the composition and the associated dissolution structures and explanation of the imbibition characteristics of oxidative fluid in shale. The results show that the final amount of oxidative fluid imbibed is higher than that of DI water; oxidation-induced microfractures during the imbibition lead to a “phase step” of the normalized imbibed volume vs time curve and “S” characteristic of the normalized imbibed volume vs square root of time (sqrt time) curve. These differences are mainly caused by the improvement of the imbibition pathway and the increase of water retention space by oxidation. After the oxidation treatment of crushed shale samples for 48 h, lots of oxidation-induced microfractures and dissolution pores were observed by field-emission scanning electron microscopy. Combining the analysis of X-ray diffraction (XRD) and atomic absorption spectroscopy (AAS) found that the dissolution pores seemed to strongly contribute to the loss of calcite, dolomite, and pyrite. Results from mercury injection capillary pressure analysis showed that the oxidative dissolution could lead to a high porosity and good connectivity of nanoscale pores networks in shale cubes. Moreover, oxidative dissolution decreased the barriers of microfracture propagation according to the decrease of zeta potential in the shale–water system and, meanwhile, accelerated the release of clay hydration forces to induce microfractures. The results indicate that the coordinative effect between spontaneous imbibition and oxidative dissolution may play a significant role in increasing the gas supply ability of nanoscale pores and microfractures, thus achieving oxidizing stimulation of shale formation to enhance shale gas recovery.

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“…Under different mean stresses, the S-N curves were different. Therefore, the influence of mean stress on fatigue life had been widely studied (Kamaya and Kawakubo, 2015;Duran and Hernandez, 2015;Cai et al, 2018;Geng et al, 2019). New mean stress corrected strain energy model of fatigue life prediction was proposed by Zhu et al (2017), who incorporated a mean stress sensitivity parameter to modify the dissipated strain energy.…”

Section: Ec 386mentioning

confidence: 99%

An improved fatigue life prediction model for shock absorber cylinder with surface roughness correction

Wang

Liu

et al. 2021

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Purpose The purpose of this paper is to obtain a more accurate fatigue life of structures by introducing the surface roughness into fatigue life prediction model. Design/methodology/approach Based on the fatigue life prediction model with surface roughness correction, the shock absorber cylinder is taken as an example to verify the feasibility of the improved method. Based on the load of the shock absorber cylinder during driving, fatigue experiments are performed under longitudinal and lateral forces, respectively. Then, the fatigue life predicted by the modified model is compared with that predicted by the traditional model. Findings By comparing with the test results, considering the influence of mean stress, the Manson method is more accurate in life prediction. Then, the modified Manson-Coffin and Manson method with surface roughness is more accurate in life prediction under longitudinal force and lateral forces, respectively. This verifies the feasibility of the improved method with the surface roughness. Originality/value The research on the influence of surface roughness on fatigue life can lay the technical foundation for the life prediction of products and have great significance to the quality evaluation of products.

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A threshold formula for fatigue crack growth with mean stress intensity factors

Cited by 16 publications

References 32 publications

Evaluation and prediction of material fatigue characteristics under impact loads: review and prospects

Evaluation and prediction of material fatigue characteristics under impact loads: review and prospects

Imbibition of Oxidative Fluid into Organic-Rich Shale: Implication for Oxidizing Stimulation

An improved fatigue life prediction model for shock absorber cylinder with surface roughness correction

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