Fatigue in engine connecting rod bolt due to forming laps

Griza, Sandro; Bertoni, Fabiano; Zanon, Gabriele; Reguly, Afonso; Strohaecker, Telmo Roberto

doi:10.1016/j.engfailanal.2008.10.002

Cited by 34 publications

(20 citation statements)

References 7 publications

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“…Dari hasil pemeriksaan komposisi kimia menunjukan bahwa Material yang digunakan adalah JIS G 4106 Class SMn 433 (Tabel.1), sesuai dengan material yang direkomendasikan untuk connecting rod dan pemeriksaan secara visual dan metalografi didapat hasil struktur mikro martensit halus, juga terdapat retak rambut pada area patah fatik bushing [8] . Kerusakan berawal pada connecting rod di area bushing (gambar 4) [5] , dari bentuk permukaan patahan, patahan diawali dengan terbentuknya beberapa initial crack yang membuat menjadi retak fatik (perambatan retak) yang cukup luas dan hampir mencapai setengah dari penampang connecting rod di bagian bushing (gambar.4), dan ditemukan dua area perambatan patah lelah yang berbeda luas 4] . Terjadinya patah lelah dengan indikasi tersebut disebabkan oleh spin ruang bushing yang berbenturan akibat keausan / gesekan yang cukup signifikan hingga membentuk jarak antara bushing dengan permukaan diameter dalamnya (longgar), keausan tersebut disebabkan oleh kurangnya lubrikasi atau pelumasan (gambar 5 dan 6).…”

Section: Pemeriksaan Mikrostrukturunclassified

Fenomena Terjadinya Kerusakan Pada Material Batang Piston

Nusa¹

2023

Majalah Ilmiah Pengkajian Industri

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Fenomena terjadinya kerusakan pada material batang piston, tulisan ini membahas tentang batang piston atau connecting rod sebagai batang penyambung berfungsi untuk memindahkan gaya yang mendorong piston, pada mesin yang mengubah gerak vertikal/horizontal dari piston menjadi gerak rotasi (putaran). Terjadi kerusakan dan pecah pada area bushing dan patah pada batang connecting rod. Dilakukan penelitian untuk mengetahui penyebab kerusakan tersebut dengan metode fractography, metalography, uji kekerasan dan uji komposisi kimia dan secara visual. Ditemukan indikasi kerusakan berawal pada dearah bushing dengan awal retak (initial crack) dan penjalaran retak (crack propagation) juga beberapa retak rambut, ini bentuk patah fatik dan menyebabkan patah pada batang connecting rod dengan ciri patah ulet (ductile fracture). Patah fatik akibat dari benturan halus yang berlangsung beberapa lama akibat dari rongga bushing yang longgar karena kurangnya pelumasan atau pelumasan yang kurang sempurna. Kata kunci : Connecting Rod – Pelumasan – Longgar – Retak – Pecah

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Section: Pemeriksaan Mikrostrukturunclassified

Fenomena Terjadinya Kerusakan Pada Material Batang Piston

Nusa¹

2023

Majalah Ilmiah Pengkajian Industri

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“…A number of efforts has been made to improve performance of connecting rods. Apart from experimental studies using fracture analysis and microstructural examination, the use of a finite element model (FEM) could aid to improve the design of a connecting rod [6,7].…”

Section: Introductionmentioning

confidence: 99%

Failure analysis and fatigue performance evaluation of a failed connecting rod of reciprocating air compressor

Ilman

Barizy

2015

Engineering Failure Analysis

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“…In addition, a local bending effect was produced as well, which led to premature rod fatigue failure. The study [7] and common literature dealing with bolted joints [8] highlight that it is generally recommended to fasten screws up to a sufficiently high tightening torque, which makes it possible to achieve a sufficiently strong preload. In fact, the higher the preload, the lower the stress amplitude being transferred to the screw under fatigue in service condition.…”

Section: Introductionmentioning

confidence: 99%

“…In fact, the higher the preload, the lower the stress amplitude being transferred to the screw under fatigue in service condition. The studies [6,7] highlight that the actually achieved big hole bolt preload does have a significant impact on the screw behavior and on the rod response from different points of view. In fact, on one hand, a too high preload may generate a too high load on the rod surface, thus weakening this component, and exposing it to fatigue and fretting failures.…”

Section: Introductionmentioning

confidence: 99%

Tribological Properties of Connecting Rod High Strength Screws Improved by Surface Peening Treatments

Croccolo

Agostinis

Fini

et al. 2020

Metals

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Bolted joints are highly loaded components and serious issues may arise from improper fastening and in particular from too high or too low preload. Friction at the underhead plays an important role, as it significantly affects the achievable preload for fixed and controlled tightening torque. In addition, multiple tightening is usually performed on connecting rod screws, which may be a further source of friction increment. This study investigates the effect of two surface treatments, shot-peening and deep-rolling, on the tribological properties upon bolt fastening. This topic was tackled experimentally and the campaign involved MJ9 X 1 4 g grade 13.9 36 NiCrMo connecting rod screws, in both lubricated and dry conditions. The results, processed by statistical tools, indicate that deep-rolling does not affect friction, whereas shot-peening yields significant benefits. As an effect of the generation of dimples and multiple contacts, it is able to lower (up to 25%) the bearing frictional coefficient in lubricated conditions, also making the friction level independent of the number of re-tightenings. For a dry surface, an even higher friction decrease (up to 30%) is achieved. Without lubrication, the friction coefficient keeps increasing for the incremented number of tightenings, but the increase rate is lowered with respect to the untreated surface.

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Fatigue in engine connecting rod bolt due to forming laps

Cited by 34 publications

References 7 publications

Fenomena Terjadinya Kerusakan Pada Material Batang Piston

Fenomena Terjadinya Kerusakan Pada Material Batang Piston

Failure analysis and fatigue performance evaluation of a failed connecting rod of reciprocating air compressor

Tribological Properties of Connecting Rod High Strength Screws Improved by Surface Peening Treatments

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