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Ab initiodynamics of rapid fracture (1998)

Abraham, Farid F ; Brodbeck, D ; Rudge, W E ; [weitere]

Institute of Physics

In: Modelling and Simulation in Materials Science and Engineering. 1998; 6(5): 639-670. Published 1998 Sep 01. doi: 10.1088/0965-0393/6/5/010.

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Publikationsdatum: 1998-09-01

Print ISSN: 0965-0393

Digitale ISSN: 1361-651X

Thema: Maschinenbau

Publiziert von Institute of Physics

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THE ELECTRON CHANNELLING CONTRAST TECHNIQUE APPLIED TO THE CHARACTERISATION OF DISLOCATION STRUCTURES IN THE VICINITY OF A FATIGUE CRACK (1997)

Chen, D. L. ; Melisova, D. ; Weiss, B. ; [weitere]

Oxford, UK : Blackwell Publishing Ltd

Fatigue & fracture of engineering materials & structures 20 (1997), S. 0

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ISSN: 1460-2695

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Maschinenbau

Notizen: Abstract— In this investigation the Electron Channelling Contrast (ECC) technique in scanning electron microscopy (SEM) was applied to reveal the dislocation structures in the vicinity of surface fatigue cracks in comparison to those of cyclically-deformed recrystallized polycrystalline copper. The plastic zone around a fatigue crack was found to consist of an innermost region containing cells, followed by a region containing dense veins and PSBs, surrounded by a structure of loose veins, bundles and loop patches typical of the cyclically deformed matrix. A relation between plastic strain amplitude values deduced from cyclic stress-strain investigations and the dislocation structures near fatigue cracks are given. Typical regions of damage accumulation were identified and plastic strain contours for surface fatigue cracks established. The essentially non-destructive ECC technique is particularly suited to identify the changes in mesoscopic dislocation structures from surface layers to the interior of specimens over large specimen areas.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1460-2695.1997.tb01510.x

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ANALYSIS OF CRACK INITIATION AND PROPAGATION IN FRETTING FATIGUE: THE EFFECTIVE INITIAL FLAW SIZE METHODOLOGY (1997)

Fellows, L. J. ; Nowell, D. ; Hills, D. A.

Oxford, UK : Blackwell Publishing Ltd

Fatigue & fracture of engineering materials & structures 20 (1997), S. 0

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ISSN: 1460-2695

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Maschinenbau

Notizen: Abstract— A number of fretting fatigue tests were carried out on CMV steel and INCO 718 alloys under closely controlled experimental conditions. A fracture mechanics-based lifing model was developed and the Paris Law employed to predict fatigue lives under a range of experimental conditions. An effective initial flaw size was used to describe initiation and early propagation of cracks. This approach was found to give good predictions of fatigue life of specimens for different values of bulk stress under the same fretting load.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1460-2695.1997.tb00402.x

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Digitale Medien

MECHANISMS AND FACTORS THAT INFLUENCE POSTWELD INTERGRANULAR UNDERCLAD CRACKING (1996)

Tigges, D. ; Piques, R. ; Buisine, D. ; [weitere]

Oxford, UK : Blackwell Publishing Ltd

Fatigue & fracture of engineering materials & structures 19 (1996), S. 0

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ISSN: 1460-2695

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Maschinenbau

Notizen: Abstract— Forged components of ferritic steel can be protected by a welded austenitic stainless steel clad. Intergranular cracking can take place in the ferritic phase close to the ferritic austenitic interface. After developing a technique for fabrication of these cracks, the formation conditions are studied. Auger electron spectroscopy investigations of specimens containing a real crack opened inside the vacuum chamber are used for interpretation. Sulphur segregations embrittle the grain boundaries which are cracked by residual and thermal stresses during the postweld heat treatment.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1460-2695.1996.tb01324.x

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ON THE FRACTURE OF COLD-WORKED Zr–2.5Nb PRESSURE TUBES FABRICATED FROM 100% RECYCLED MATERIAL (1995)

Davies, P. H. ; Aitchison, I. ; Himbeault, D. D. ; [weitere]

Oxford, UK : Blackwell Publishing Ltd

Fatigue & fracture of engineering materials & structures 18 (1995), S. 0

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ISSN: 1460-2695

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Maschinenbau

Notizen: Abstract A study was completed on irradiated and unirradiated (offcut) material from Pickering Nuclear Generating Station (NGS) A Unit 3 pressure tubes which were fabricated from ingots of 100% recycled material (quadruple-vacuum-arc-melted). The toughness of the material is shown to be generally higher than that of previous material fabricated from 〈 100% recycled material (double-vacuum-arc-melted). Fractographic and microstructural studies demonstrate that variations in toughness of the low chlorine (〈 1 ppm) material are predominantly due to preferential void nucleation at particles, in particular aligned zirconium phosphides. In the absence of such particles, very high toughness levels can be maintained after irradiation.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1460-2695.1995.tb00904.x

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Digitale Medien

THE BEHAVIOUR OF SMALL CORNER CRACKS IN A FERRITIC/PEARLITIC STEEL: EXPERIMENTS AND ANALYIS (1995)

Craig, D. ; Ellyin, F. ; Kujawski, D.

Oxford, UK : Blackwell Publishing Ltd

Fatigue & fracture of engineering materials & structures 18 (1995), S. 0

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ISSN: 1460-2695

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Maschinenbau

Notizen: Abstract An experimental investigation into the growth and closure behaviour of small corner cracks has been conducted on a low carbon steel (ASTM A516 Grade 70). This ferritic/pearlitic steel has been chosen to investigate the complexities of small crack behaviour in the dual phase material. Innovative procedures are used for compliance measurement and opening load determination. The closure and growth behaviour of the small corner cracks are presented in terms of shape and size. The results are divided into two stages, the first pertaining to the “stationary crack”, and the second dealing with the crack as it grows. The cracks are shown to exhibit an irregular growth rate, which is in part, shown to correspond with microstructural features of the material. In the short crack regime, the linear fracture mechanics parameter, ΔK does not correlate with the data and the use of a ΔKeff based on the effective applied load provided little improvement.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1460-2695.1995.tb00910.x

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