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THE FATIGUE LIFE OF THICK-WALLED AUTOFRETTAGED CYLINDERS WITH CLOSED ENDS (1991)

Rees, D. W. A.

Oxford, UK : Blackwell Publishing Ltd

Fatigue & fracture of engineering materials & structures 14 (1991), S. 0

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ISSN: 1460-2695

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Abstract— It is well known that the fatigue strength of a thick-walled cylinder is enhanced by autofrettage. However, this does not appear to have been explained from fracture mechanics. The present paper shows that two uncertainties arise when this is attempted. Firstly, the distribution of residual stress resulting from the autofrettage pressure must be estimated and secondly a realistic stress intensity factors for subsequent fatigue cracking must be defined. A number of available stress intensity solutions are modified with the author's predictions to the residual stress following an elastic-plastic autofrettage pressure in a closed cylinder of hardening material. A comparison with experiment has enabled the various approaches to be appraised. It is shown that a modified stress intensity factor of Bowie and Freese is most consistent with the propagation fatigue life observed in autofrettaged cylinders provided their solution is adapted to account for the propagation of a semi-elliptical crack front in the presence of residual stress. Other K1 estimates appear to lead to dangerously optimistic predictions particularly within the range of fluctuating pressure where failure occurs between 105 and 106 cycles. The contribution to fatigue failure from initiation cycles is expressed as a power function of the observed life for cyclic pressures in the region of the fatigue limit.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1460-2695.1991.tb00642.x

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An examination of yield surface distortion and translation (1984)

Rees, D. W. A.

Springer

Acta mechanica 52 (1984), S. 15-40

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ISSN: 1619-6937

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: Summary It is shown that the components of a sixth rank anisotropy tensor are physically significant in representing the distortion observed in both the initial and subsequent yield surface for a polycrystalline material. This feature of anisotropy does not appear in the ellipsoidal surface given by previous theories in which second and fourth rank anisotropy tensors are employed. The number of tensor components, for a series function embodying tensor terms in ascending rank, reduces to a manageable number by the imposition of symmetry and coincidence between the axes of stress and principal orthotropic directions. The identification is made between the yield limits, as found from biaxial stress experiments and tensor components in composite sum form. A one-to-one correspondence is found from a further simplification through the assumption of incompressibility. This is confirmed experimentally for an orthotropic rolled copper and copper alloy sheet. An examination is made of the physical significance of a translation tensor which appears in the subsequent yield function. It is shown that the components of this tensor can be directly identified with those of an internal stress tensor that is a consequence of the heterogenous slipped state in a deformed polycrystal.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01175962

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An experimental appraisal of the equi-strain multi-surface hardening model (1987)

Rees, D. W. A.

Springer

Acta mechanica 70 (1987), S. 193-219

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ISSN: 1619-6937

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: Summary Comparisons are made between predictions from a multi-surface representation of the hardening behaviour in polycrystalline materials and experimental results. In general, good agreement is found for the deformation behaviour, i.e. non-linear stress-strain response, a rotation in the plastic strain path and the Bauschinger effect, under stress paths which change direction. It is further shown that the model supplies more reliable predictions to the observed behaviour than those corresponding to the isotropic and kinematic hardening rules. The valid range of application for the latter rules is also clarified. The limitations of the multi-surface model, in particular, are discussed in respect of initial material anisotropy and from a cyclic loading test with ratcheting.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01174655

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Yield functions that account for the effects of initial and subsequent plastic anisotropy (1982)

Rees, D. W. A.

Springer

Acta mechanica 43 (1982), S. 223-241

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ISSN: 1619-6937

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: Summary A descriptive initial yield function is presented from an examination of experimentally determined yield loci, component plastic strain paths and Lode's parameters that indicate either a severe textural anisotropy in a material or a slight departure from the von Mises condition. The transition from the initial function to one that describes a subsequent yield surface which translates with the stress vector is developed and compared with experimental results. Observations on the Bauschinger, Swift and hardening effects in subsequent yield loci, defined at the limit of proportionality, are adequately represented through Ziegler's translation law when modified for non-linear work hardening. It is shown that the marked distortion, particularly apparent, in the presence of shear stress, may be represented by considering separately the translation for each quadrant of the initial yield locus.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01176284

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