Dislocation structures in copper single crystals fatigued at low amplitudes

Buchinger, L.; Stanzl, S.; Laird, C.

doi:10.1080/01418618408244227

Cited by 57 publications

(12 citation statements)

References 36 publications

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“…Both the dislocation density map (left box) and its autocorrelation function (right box) indicate that the dislocations tend to form a more or less periodic arrangement of dense regions. The dislocation pattern developed is very similar to the so called "matrix" structure experimentally observed on fatigued fcc single crystals [60] (see Figure 10).…”

Section: Numerical Studiessupporting

confidence: 61%

See 1 more Smart Citation

Statistical physical approach to describe the collective properties of dislocations

Groma

2010

Multiscale Modelling of Plasticity and Fracture by Means of Dislocation Mechanics

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Section: Numerical Studiessupporting

confidence: 61%

“…Figure 10. Dislocation "matrix" structure obtained on fatigued Cu single crystal oriented for single slip [60].…”

Section: The Role Of Dislocation-dislocation Correlationmentioning

confidence: 99%

Statistical physical approach to describe the collective properties of dislocations

Groma

2010

Multiscale Modelling of Plasticity and Fracture by Means of Dislocation Mechanics

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“…In order to study the basic mechanisms of fatigue crack initiation, experiments on single crystals are most straightforward. Therefore, experiments on Cu single crystals were performed at room temperature and 77 K at ultrasonic frequency 18 ,. 19 Tests were conducted by increasing the displacement amplitude stepwise so as to simulate roughly a test run in plastic strain control.…”

Section: Experimental Set‐up Of An Ultrasonic Fatigue Machinementioning

confidence: 99%

Fracture mechanisms and fracture mechanics at ultrasonic frequencies

Stanzl-Tschegg¹

1999

Fatigue Fract Eng Mat Struct

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Performing fatigue tests at ultrasonic frequencies, e.g. 20 000 Hz, allows one to perform experiments beyond 109 and 1010 cycles within half a day or a week, respectively. The testing technique has led to the construction of fatigue machines of high technical standard. Use of the ultrasound technique to study the mechanisms of crack initiation in pure metal single crystals, in cast alloys with voids being crack initiation sites, and in complicated fibre‐reinforced laminates is reported. Likewise, use of ultrasonic loading to study the mechanisms of crack propagation is discussed, as well as LEFM principles; especially when these principles cannot be applied. It is shown how crack growth retardation with increasing crack length is attained in fibre‐reinforced laminates by the effect of fibre bridging. Additional experimental possibilities, e.g. random loading, variation of mean load, superposition of shear loads, variation of temperature and environment, and not only axial but also torsional loading at ultrasonic frequency, and recent research results are discussed.

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“…6-8 show the dislocation structures from misorientation cells, cells, walls, loop patches re-evolution regardless of the load condition reduction. These results vary in comparison to that for a single crystal [33]. The saturation stress for ultra-large grain is larger than that for large grain [22][23][24].…”

Section: Resultsmentioning

confidence: 96%