Fatigue crack propagation properties of submicron-thick freestanding copper films in vacuum environment

Kondo, Toshiyuki; Shin, Akihiro; Hirakata, Hideki; Minoshima, Kohji

doi:10.1016/j.prostr.2016.06.173

Cited by 8 publications

(5 citation statements)

References 4 publications

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“…In a previous study, we developed a fatigue testing machine and a method of investigating fatigue crack growth in air and vacuum. 13 Our experimental results suggested the presence of vacuum effects in approximately 500-nm-thick Cu thin films. However, the details of the vacuum effects in thin films have not yet been clarified, especially in the nearthreshold region.…”

Section: Introductionmentioning

confidence: 53%

“…This study was conducted to clarify the effects of vacuum on the properties and mechanisms of fatigue crack growth in freestanding metallic films with submicrometre thickness. In a previous study, we developed a fatigue testing machine and a method of investigating fatigue crack growth in air and vacuum . Our experimental results suggested the presence of vacuum effects in approximately 500‐nm‐thick Cu thin films.…”

Section: Introductionmentioning

confidence: 86%

“…We employed a fatigue testing machine, which was developed previously, to carry out fatigue crack growth experiments. Figure shows the external appearance and a schematic illustration of the fatigue loading mechanism of the machine.…”

Section: Experimental Methodsmentioning

confidence: 99%

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Vacuum effects on fatigue crack growth in submicrometre‐thick freestanding copper films

Kondo

Shin

Akasaka

et al. 2019

Fatigue Fract Eng Mat Struct

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To clarify vacuum effects on fatigue crack growth in freestanding metallic thin films, experiments were conducted on approximately 500‐nm‐thick copper films inside a field emission scanning electron microscope. Fatigue crack growth accompanied by intrusion/extrusion formation occurred in vacuum, and da/dN was smaller than in air in the middle‐ΔK region (ΔK ≈ 1.7‐3.1 MPam1/2). Conversely, in the low‐ΔK region (ΔK ≲ 1.7 MPam1/2), da/dN was larger in vacuum than in air. Further, fatigue crack growth in vacuum occurred below the fatigue threshold in air (ΔKth,air). A nonpropagating crack after reaching ΔKth,air continued to propagate in vacuum when the environment changed from air to vacuum. This indicates that fatigue crack growth resistance is smaller in vacuum than in air under the same effective driving force. The fatigue damage area near the crack paths in vacuum in the low‐ΔK region became wider, suggesting that the nucleation of fatigue damage was enhanced in vacuum.

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Section: Introductionmentioning

confidence: 53%

Section: Introductionmentioning

confidence: 86%

See 1 more Smart Citation

Vacuum effects on fatigue crack growth in submicrometre‐thick freestanding copper films

Kondo

Shin

Akasaka

et al. 2019

Fatigue Fract Eng Mat Struct

Self Cite

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“…For fatigue testing of micro-sized specimens ( e.g. metal foils), Kondo et al 42 developed a fatigue device driven by piezoelectric ceramics, offering a maximum frequency of 10 Hz and a maximum load of 500 mN. Geathers et al 39 integrated an ultrasonic fatigue testing device with the SEM chamber door, as shown in Fig.…”

Section: Development Of In Situ Sem Fatigue Testing Technologymentioning

confidence: 99%

In situ SEM fatigue testing technology for metallic materials: a review

Zhang,

Li,

Zhang

et al. 2024

Nanoscale

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“…31 PSB formation is also observed in air and in vacuum, ahead of a fatigue crack in thin film Cu. 32 A rough surface is formed as intrusions/extrusions in a lab air. Such a surface can introduce stress concentration to foster an early crack initiation.…”

Section: A1 | Comparative Interpretation Of Fcg In Air and Vacuummentioning

confidence: 99%

Implications of ΔK‐Rratio in vacuum

Kujawski

2022

Fatigue Fract Eng Mat Struct

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In this article we discuss the high vacuum implications on the role of positive load ratios (R = Pmin/Pmax) on the threshold ΔKth and fatigue crack growth (FCG) behavior in commercial alloys. It is experimentally observed that the ΔKth is independent of R in vacuum. Also, for a given applied ΔK, FCG rate is weakly dependent of R over the entire range of crack growth rates for several alloys. In addition, limited data on both short and long crack FCG in vacuum results fall within the same experimental scatter suggesting that a typical small crack FCG effect observed in lab air was insignificant or diminished in vacuum. A marginal R‐ratio effects on ΔKth in vacuum are seen for materials with different microstructures, yield strengths, elastic modulus, work hardening properties, and slip modes. The provided analysis and examples seem to imply that FCG in vacuum be primarily dependent on applied ΔK that comes from mechanical driving force. Possible mechanistic explanations are given.

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Fatigue crack propagation properties of submicron-thick freestanding copper films in vacuum environment

Cited by 8 publications

References 4 publications

Vacuum effects on fatigue crack growth in submicrometre‐thick freestanding copper films

Vacuum effects on fatigue crack growth in submicrometre‐thick freestanding copper films

In situ SEM fatigue testing technology for metallic materials: a review

Implications of ΔK‐Rratio in vacuum

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