The nature of the stress singularity that occurs at the surface of an axisymmetric, two-material creep test specimen has been investigated. Steady state finite element analyses were obtained for this purpose, using Norton's power law creep equations having the same stress exponent for each material. The strength of the singularity was found to be strongly dependent upon the relative creep strengths of the two materials, but was surprisingly insensitive to the relative dimensions of the two materials. The implications of the results for practical situations are discussed.
HydeT. H.SunW.A method for estimating the stress distributions on the centre line of axisymmetric two-material creep test specimens. Int. J. Mech. Sci. (accepted).
2.
BogyD. B.Edge-bonded dissimilar orthogonal elastic wedges under normal and shear loading. J. Appl. Mechanics, 1968, 35, 460–466.
3.
DundursJ.Discussion on: Edge-bonded dissimilar elastic wedges under normal and shear loading. J. Appl. Mechanics, 1969, 36, 650–652.
4.
EnglandA. H.On stress singularities in linear elasticity. Int. J. Engng Sci., 1971, 9, 571–585.
5.
KellyP. A.HillsD. A.NowellD.The design of joints between elastically dissimilar components. J. Strain Analysis, 1992, 27, 15–20.
6.
LauC. W.DelaleF.Interfacial stress singularities at free edge of hybrid metal matrix composite. J. Engng Mater. Technol., 1988, 110, 41–47.
7.
RudgeM. R. H.Interfacial stress singularities in bi-material wedge. Int. J. Fracture, 1993, 63, 21–26.
8.
HallF. R.HayhurstD. R.Continuum damage mechanics modelling of high temperature deformation and failure in a pipe weldment. Proc. R. Soc. Lond. A, 1991, 433, 383–403.
9.
ABAQUS Version 5.4, Hibbitt, Karison and Sorenson Inc., 1994.
10.
FEMGEN/FEMVIEW, Femsys Ltd, 1992.
11.
HydeT. H.YehiaK.SunW.Observations on the creep of two-material structures. J. Strain Analysis, 1996, 31 (6), 441–461.
