Crack growth at fastener holes containing intergranular cracking

Peng, Daren; Jones, Rhys; Lo, Michael Chie Siung; Bowler, Adam; Brick, Gregory; Janardhana, Madabhushi; Edwards, D.A.

doi:10.1016/j.engfracmech.2015.01.032

Cited by 7 publications

(13 citation statements)

References 5 publications

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“…Eq. This supports the supposition in Refs 35,36,56 that, provided that the IGC does not break through to the free surface and result in spalling, the effect of IGC on fatigue crack propagation is small. The stress intensity threshold ΔK thr values used to capture the scatter in the test data varied from 0.20 to 0.50 MPa √m.…”

Section: R E S U L T S a N D Discussion Ssupporting

confidence: 87%

“…other than the IGC and associated surface pitting, there was no artificially notch introduced. As first revealed in Refs 35,36 , the finite element analysis showed that, provided that there is minimal deviation in the IGC growth path 50 and the maximum gap in § Location FCA352-PDN-1 corresponds to 'the fairing dome nut holes in the lower surface panels at the inboard nacelle'; location FCA361-PDN-3 corresponds to 'the outer wing lower panels 1 to panel 3inboard nacelleoutboard fillet fairing dome nut holes'. The advantages of this formulation are cracks do not have to be explicitly modelled; there is no restriction on the aspect ratios, which are allowed to change as the crack(s) grow; and only the uncracked finite element model is required.…”

Section: O M P U T I N G T H E S T R E S S I N T E N S I T Y F a C mentioning

confidence: 63%

“…In the fracture and fatigue analyses, the associated SIFs were computed using the weight function method as per Refs 35,36 . Models were created for both with and without IGC.…”

Section: O M P U T I N G T H E S T R E S S I N T E N S I T Y F a C mentioning

confidence: 99%

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Crack growth at fastener holes containing intergranular cracking

Jones

Bowler

et al. 2017

Fatigue Fract Eng Mat Struct

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This paper examines the growth of cracks at a fastener hole containing intergranular cracking with a focus on ‘dome nut hole’ coupons that are representative of a critical location in the Royal Australian Air Force AP‐3C Orion wing. It is shown that crack growth under operational flight loads can be captured using the NASGRO formulation and that the scatter in these various tests can also be captured by allowing for small variations in the value of the cyclic stress intensity fatigue threshold. In this context, it is shown that crack growth can be captured using both a cycle‐by‐cycle analysis and also a United States Air Force ‘characteristic K’ approach. We also see that, for the operational load spectra considered, the crack growth history is approximately exponential so that the United States Air Force risk assessment computer program (PRobability Of Fracture) can be used to assess the risk of failure by fracture. The results of this study also suggest that, provided that intergranular cracking does not turn and break through to a free surface, it should have little effect on crack growth at a fastener hole.

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Section: R E S U L T S a N D Discussion Ssupporting

confidence: 87%

Section: O M P U T I N G T H E S T R E S S I N T E N S I T Y F a C mentioning

confidence: 63%

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Crack growth at fastener holes containing intergranular cracking

Jones

Bowler

et al. 2017

Fatigue Fract Eng Mat Struct

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“…Bentuk permukaan patahan berupa patah lelah, terlihat adanya alur garis pantai (beach mark) [6][7][8] (Gambar 8).…”

Section: Pemeriksaan Fraktografiunclassified

ANALISIS KERUSAKAN RADIATOR SEPEDA MOTOR 150cc

Suhadi¹

2023

Majalah Ilmiah Pengkajian Industri

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AbstrakSepeda motor yang mempunyai kapasitas mesin relatif besar memerlukan pendingin yang efisien agar ketika beroperasi tidak mengalami panas yang berlebihan sehingga dapat merusak mesin tersebut. Jika sepeda motor dengan kapasitas mesin kecil cukup menggunakan pendingin udara, maka sepeda motor dengan kapasitas mesin besar menggunakan pendingin dengan sistem cairan, dan dikenal dengan nama radiator. Jika radiator rusak maka proses pendinginan tidak berjalan dengan baik sehingga berpotensi terjadi kebakaran pada mesin. Pada penelitian ini dilakukan analisa terhadap kebocoran yang terjadi pada sebuah radiator sepeda motor 150cc, dengan tujuan untuk mencari penyebab kerusakan dari radiator tersebut agar kerusakan serupa tidak terjadi pada produk sepeda motor yang sejenis. Analisa yang dilakukan meliputi pemeriksaan permukaan patahan dengan cara analisa makro fraktografi, pemeriksaan struktur mikro, pemeriksaan komposisi kimia, pemeriksaan kekerasan dan pemeriksaan SEM (Scanning Electron Microscopy) serta pemeriksaan menggunakan EDS (Energy Dispersive Spectrometer). Hasil penelitian menunjukkan bahwa retak dan patahnya penopang radiator disebabkan adanya beban dinamis atau getaran yang terjadi pada konstruksi tersebut dan dipikul oleh pelat penopang radiator. Bukti dari hasil pemeriksaan menunjukkan bahwa karet yang berfungsi sebagai peredam getaran radiator pada posisi atas telah aus dan kendur sehingga fungsi peredaman tidak optimum lagi, sehingga pelat penopang radiator retak dan retaknya merambat ke kisi kisi yang berisi cairan pendingin dan mengakibatkan kebocoran.

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“…This generally takes less than 5 minutes on a laptop or a PC. Examples of this technique applied to cracking in sideframes, couplers and rail wheels are given in [14,17] and examples associated with cracking in aerospace materials are given in [8,21]. d)…”

Section: Introductionmentioning

confidence: 99%

Effect of corrosion and fatigue on the remaining life of structures and its implication to additive manufacturing

Peng

Jones²,

Berto

et al. 2018

Frattura Ed Integrità Strutturale

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ABSTRACT. This paper investigates the combined effect of corrosion and fatigue on the growth of cracks that arise from natural corrosion in steel bridges. It is shown that if these two effects need to be simultaneously analyzed. If not, then the resulting life is not conservative. Consequently, to enable a better understanding of the remaining life of steel bridges this paper presents a simple methodology for performing this coupled analysis. The implication of this study to additively manufactured Ti-6Al-4V is also discussed. KEYWORDS. Steel bridges; Corrosion; Fatigue crack growth; Remaining life.Citation: Peng., D., Jones, R., Berto, F., Razavi, S.M.J., Effect of corrosion and fatigue on the remaining life of structures and its implication to additive manufacturing, Frattura ed Integrità Strutturale, 45 (2018) 33-44.

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Crack growth at fastener holes containing intergranular cracking

Cited by 7 publications

References 5 publications

Crack growth at fastener holes containing intergranular cracking

Crack growth at fastener holes containing intergranular cracking

ANALISIS KERUSAKAN RADIATOR SEPEDA MOTOR 150cc

Effect of corrosion and fatigue on the remaining life of structures and its implication to additive manufacturing

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