Ae. Giannakopoulos et al., ELASTOPLASTIC ANALYSIS OF THERMAL CYCLING - LAYERED MATERIALS WITH COMPOSITIONAL GRADIENTS, Acta metallurgica et materialia, 43(4), 1995, pp. 1335-1354
Citations number
24
Categorie Soggetti
Material Science","Metallurgy & Metallurigical Engineering
Elastoplastic analyses are presented for the cyclic thermal response i
n multi-layered materials which comprise layers of fixed compositions
of a metal and a ceramic, and a compositionally graded interface. Anal
ytical solutions for the characteristic temperature at which the onset
of thermally induced plastic deformation occurs are derived for the l
ayered composite. Solutions for the evolution of curvature and thermal
strains, and for the initiation of plastic yielding are also obtained
for different combinations of the geometry, physical properties and c
ompositional gradation for both thermoelastic and thermoplastic deform
ation. Finite-element formulations incorporating continuous and smooth
spatial variations in the composition and properties of the graded la
yer are used to simulate the evolution of thermal stresses, the accumu
lation of plastic strains, and the development of monotonic and cyclic
plastic zones at the interfaces, edges and free surfaces of different
layers during thermal cycling. Engineering diagrams detailing the eff
ects of compositional gradients are also presented for optimizing ther
mal residual stresses, layer geometry, acid plastic strain accumulatio
n.