Development of Fatigue Testing System for in-situ Observation by an Atomic Force Microscope and Small Fatigue Crack Growth Behavior in α-Brass

Sugeta, Atsushi; Uematsu, Yoshihiko; Tomita, Keitarou; Hirose, Keikichi; Jono, Masahiro

doi:10.1299/jsmea.49.382

Cited by 4 publications

(4 citation statements)

References 10 publications

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“…Crack initiation took place at slip band roots and propagation was mainly transgranular and occasionally intergranular. The crack mode is similar to the one observed in α-brass [39,40].…”

Section: Crack Initiationsupporting

confidence: 76%

Low cycle fatigue behaviour of a precipitation hardened Cu-Ni-Si alloy

Delbove

Vogt

Bouquerel

et al. 2016

International Journal of Fatigue

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Low cycle fatigue tests were performed at room temperature to investigate the role of the microstructure of a Cu-Ni-Si alloy on the stress response to strain cycling and on the fatigue resistance. The cyclic accommodation consisted in a hardening followed by a softening. TEM analysis showed that in some grains dislocations remained isolated and confined between precipitates while in other grains dislocations piled up at δ-Ni 2 Si precipitates and then cut them. Repetitive cutting allows their dissolution and formation of precipitate-free bands where the plastic deformation is localised. The Manson-Coffin diagram exhibited two regimes according to the proportion of grains involved in the plastic deformation accommodation. Keywords copper alloys-cyclic properties-low cycle fatiguemicrostructure-microscopy Highlights Investigated Cu-Ni-Si contains δ-Ni 2 Si nano precipitates-Cyclic hardening followed by softening is observed-Dissolution of δ-Ni 2 Si results from repetitive cutting-Deformation is localised in precipitate-free bands Highlights Investigated Cu-Ni-Si contains a high density of δ-Ni Si precipitates-Cyclic hardening followed by softening is observed-Dissolution of δ-Ni 2 Si results from repetitive cuttinglocalisation of deformation in precipitate-free bands

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“…Crack initiation took place at slip band roots and propagation was mainly transgranular and occasionally intergranular. The crack mode is similar to the one observed in α-brass [39,40].…”

Section: Crack Initiationsupporting

confidence: 76%

Low cycle fatigue behaviour of a precipitation hardened Cu-Ni-Si alloy

Delbove

Vogt

Bouquerel

et al. 2016

International Journal of Fatigue

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“…The short surface cracks grew in a zigzag manner because the cracks grew along the α/Bi and α/β grain boundaries. The FCG morphology of such short surface cracks was similar to the observations of 7-3 [ 6 ] and 6-4 brasses [ 9 ].…”

Section: Resultssupporting

confidence: 80%

“…Therefore, in the low-FCG region, the influence of d and R on the FCG velocity becomes significant. According to Sugeta et al [ 9 ], in the low-FCG velocity range, owing to the effects of grain boundaries and repeated strain hardening, the slip system that had been operating until it was suppressed, and other slip systems began to operate, leading to zigzag FCG behavior. The above observations were similar to those for 7-3 brass [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Study on the Fatigue Crack Initiation and Growth Behavior in Bismuth- and Lead-Based Free-Cutting Brasses

et al. 2022

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Several studies have been conducted on the fatigue behavior of copper and 7-3, and 6-4 brasses. However, there have been fewer studies on the fatigue behavior and fatigue crack growth (FCG) properties of free-cutting brass, primarily because emphasis has been placed on the development of lead-free free-cutting brass. In this study, fatigue experiments were performed in the atmosphere at room temperature using three types of free-cutting, two types of bismuth (Bi)-based (with different grain sizes), and lead (Pb)-based brasses. It was found that lead-free Bi-based free-cutting brass had approximately the same fatigue performance as that of Pb-based free-cutting brass. It was also clarified that the addition of Bi or Pb initiated fatigue cracks, and that the crack growth period occupied most of the fatigue life. Differences in the FCG behavior of the three free-cutting brasses were observed in the low ΔK range. The modified linear fracture mechanics parameter M was used to quantitatively analyze the fatigue life and FCG behavior (short surface cracks). A comparison between the calculated and experimental results showed that M was useful.

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“…This chapter presents a FTM materials testing machine and experimental fatigue tests, to study composite materials behavior subjected to fatigue bending plane; the machine is designed to perform specific fatigue tests with different boundary conditions (such as frequency, elastic modulus, etc.). The development of a fatigue testing machine in plane bending starts with the need to perform multi-axial fatigue tests on metallic materials (Frustey & Laserre, 1989) and to make fatigue-corrosion tests (Berchem & Hocking, 2006), on aluminum alloys (Beck et at 2002; 2001) and on α-brass (Sugeta et al 2006). It is very difficult to find specifics to FTM machines for composite and polymeric materials in the literature (Trotignon, 1995;Caligiana et al 2003;Marannano et al 2007), while applications on bonded joints are not frequent.…”

Section: Introductionmentioning

confidence: 99%