Direct Observation of Fatigue Crack Growth Behavior under Repeated Two-step Loading Using Field Emission Type Scanning Electron Microscope.

Jono, Masahiro; Sugeta, Atsushi; Hamasaki, Toshiaki

doi:10.2472/jsms.40.1428

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“…Early work of Kikukawa and Jono 7–10 was on fatigue crack growth in an SEM on a grain‐orientated 3% silicon iron to confirm that the mechanism of mode I crack growth at relatively high stress intensity regime is an alternative slipping‐off process at the apex of the fatigue crack. The authors successfully developed an image processing system for a quantitative analysis of the crack tip opening displacement (CTOD) 10 , 11 and slip deformation near the fatigue crack tip. Using this system they clarified the retardation mechanism of fatigue crack growth under Hi‐Lo two‐step loading 12 .…”

Section: Introductionmentioning

confidence: 96%

“…Most direct observations of fatigue crack growth behaviour has been made using an optical microscope and/or a scanning electron microscope (SEM), and many valuable findings on the crack growth mechanism have been obtained 1–6 . Early work of Kikukawa and Jono 7–10 was on fatigue crack growth in an SEM on a grain‐orientated 3% silicon iron to confirm that the mechanism of mode I crack growth at relatively high stress intensity regime is an alternative slipping‐off process at the apex of the fatigue crack. The authors successfully developed an image processing system for a quantitative analysis of the crack tip opening displacement (CTOD) 10 , 11 and slip deformation near the fatigue crack tip.…”

Section: Introductionmentioning

confidence: 99%

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Atomic force microscopy and the mechanism of fatigue crack growth

Jono

Sugeta

Uematsu

2001

Fatigue Fract Eng Mat Struct

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Fatigue crack test was performed using a grain‐orientated 3% silicon iron under constant amplitude loading. Growth behaviour of the fatigue crack and slip deformation behaviour near the crack tip were observed in detail by using an atomic force microscope. In the lower K region, only one preferential slip system of this material operated and the fatigue crack grew along that slip plane. It was found that constraint of slip deformation due to cyclic strain hardening resulted in crack arrest and crack branching. The fatigue crack grew in a zigzag manner as a result of such successive crack branching and deflection. In the high K region, two preferential slip systems operated simultaneously to an almost identical extent and the fatigue crack grew in a direction perpendicular to the loading axis. The slipping distance in one loading cycle was measured quantitatively by using the image processing technique and the crack growth mechanism is discussed.

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Section: Introductionmentioning

confidence: 96%