ISSN:
1551-2916
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
The stress relaxation of two-phase polycrystalline ceramics has been examined. A two-dimensional array of elastic hexagonal grains embedded in a contiguous fluid has been used as a model for grain-boundary sliding and grain interlocking. The viscoelastic constitutive equation, in a phenomenological sense, is of a nonlinear Maxwell type; the model is composed of a strain-dependent dashpot and an elastic spring connected in series. The squeezing-in/out processes and mechanisms of grain-boundary fluid essentially result in the rheological nonlinearity. The experimental results in stress-relaxation tests of a β-spodumene glass-ceramic under simple shear are characterized from the standpoint of the nonlinear constitutive equation. It is emphasized that the stress-relaxation test is one of the important test techniques that enables one to study quantitatively the rheological behavior of polycrystalline ceramics with grain-boundary sliding and grain interlocking without any of the difficulties and ambiguities that are accompanied by stress-induced grain-boundary cavities, which so often appear in conventional creep tests.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1151-2916.1999.tb01737.x
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