TY  - EJOU
AU  - Ko, Sun-Chien  
AU  - Hu, Chen-Ti  
AU  - Lee, Sanboh  
AU  - Chou, Y.T.  

TI  - Chemical Stresses Induced by Boundary Layer Diffusion in a Cylindrical Sandwich Composite
T2  - Computers, Materials \& Continua

PY  - 2012
VL  - 28
IS  - 2
SN  - 1546-2226

AB  - The chemical stresses developed in a cylindrical sandwich composite during radial boundary layer diffusion have been investigated. The system consists of a thin layer A of circular cross section sandwiched between two semi-infinite outer layers B, with the diffusivity of diffusant in A (<i>D</i><sub><i>A</i></sub>) being much greater than that in B (<i>D</i><i><sub>B</sub></i>). Two boundary conditions, the constant surface concentration and the instantaneous surface concentration, were considered. The concentration distributions were obtained by the Bessel-Laplace transform method. The stress functions were solved analytically based on the linear elasticity. Numerical computations were performed to illustrate the effects of the diffusivity ratio (<i>D</i><i><sub>A</sub></i>/<i>D</i><i><sub>B</sub></i>) and of the thickness of the central layer A on stress distributions. The results show that the induced stress in layer A increases as the diffusivity ratio, or its thickness, increases, in consistency with the general findings for composites of rectangular geometry.
KW  - Chemical stress
KW  -  Boundary layer diffusion
KW  -  Cylindrical sandwich composite

DO  - 10.3970/cmc.2012.028.165