Journal ArticleDOI
Environmental sensitivity of small crack growth in 7075 aluminium alloy
A. Zeghloul,J. Petit +1 more
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TLDR
In this paper, Fatigue propagation tests on artificial short cracks (initial length ˜ 0.15 mm) were performed in vacuum and in nitrogen containing small traces of water vapour (3 ppm) on a high strength aluminium alloy type 7075 in two aged conditions (T651 and T7351) at a load ratio of 0.1 and a frequency of 35 Hz.Abstract:
Fatigue propagation tests on artificial short cracks (initial length ˜ 0.15 mm) were performed in vacuum and in nitrogen containing small traces of water vapour (˜ 3 ppm) on a high strength aluminium alloy type 7075 in two aged conditions (T651 and T7351) at a load ratio of 0.1 and a frequency of 35 Hz. A predominant influence of environment was determined for short crack growth. This behaviour has been discussed in terms of crack growth rate versus the effective stress intensity factor range relationship previously determined for long cracks. The results obtained suggest the absence of closure at the early stage of short crack growth with an enhanced environmental influence as compared to long crack behaviour at the same load ratio. As the crack grows the effect of closure increases progressively and the short crack effect disappears after a crack growth of the order of 1 mm.read more
Citations
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Journal ArticleDOI
Exfoliation Corrosion and Pitting Corrosion and Their Role in Fatigue Predictive Modeling: State-of-the-Art Review
TL;DR: In this article, a detailed discussion of cases where granular attack and exfoliation caused issues in structural integrity in aircraft in operational fleets is presented along with a much more detailed presentation of the issues involved in dealing with corrosion of aircraft.
Journal ArticleDOI
Fatigue crack growth behavior of Ti–6Al–4V alloy forging
TL;DR: In this article, the transition from Regime I to Regime II fatigue-crack growth behavior in a room-temperature high-humidity environment (TP-1) was investigated, and an empirical correlation equation was developed to predict the transitional stress intensity factor for a number of materials.
References
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Book ChapterDOI
Plane strain crack toughness testing of high strength metallic materials.
William F. Brown,John E. Srawley +1 more
Journal ArticleDOI
Propagation of short fatigue cracks
Subra Suresh,Robert O. Ritchie +1 more
TL;DR: In this paper, the authors examined the micro-structural properties of short fatigue cracks in terms of fracture mechanics, microstructure, and environment, and compared their propagation behavior with those of long cracks.
Journal ArticleDOI
Initiation of fatigue cracks in commercial aluminium alloys and the subsequent propagation of very short cracks
TL;DR: In this paper, the authors observed the initiation of fatigue cracks at a plane polished surface and the subsequent growth of very short cracks [0.006 mm (0.00025 in.)-0.5 mm(0.02 in.) deep].
Journal ArticleDOI
The short crack problem
TL;DR: The problem associated with short crack growth, defined as situations in which the intensity of the crack tip field is underestimated by linear elastic fracture mechanics analyses, is briefly reviewed in this paper.
Journal ArticleDOI
The growth of small fatigue cracks in 7075–t6 aluminum
TL;DR: In this paper, the growth of half-penny shaped surface fatigue cracks in a precipitation hardened aluminum alloy is compared with the growth in fracture mechanics type specimens, and it is suggested that localized microplasticity in nominally elastic specimens is responsible for the rapid growth of small cracks and that grain size limitations on the micro-plastic regions cause transient decelerations and sometimes permanent arrest, in crack growth.