Stress Distribution in Multiphase Systems: II, Composite Disks with Cylindrical Interfaces

Abstract

Stress distributions calculated for thin disks having a cylindrical inclusion were found to agree with those measured for glass specimens cooled to room temperature after they were sealed. Maximum circumferential stress in the sheath was independent of inclusion size, but the more rapid decrease of this stress with distance from the inclusion makes crack extension from the interface impossible for inclusions below a certain size. For larger inclusions, flaws above a critical size can be expected to grow and to terminate after a certain distance.

Determining the shear properties of the PyC/SiC interface for a model TRISO fuel

“…The analytical solutions for the residual stress arising from the CTE mismatch, r CTE , are developed by Oel and Frechette [40] and Mikata and Taya [41]. These analytical models can be simply extended to a multi-layered tubular material.…”

The effect of neutron irradiation on the fiber/matrix interphase of silicon carbide composites

“…A clamping stress working at the F/M interface can be qualitatively predicted under the simple assumption by adopting the four-phase (fiber core/PyC interphase/SiC matrix/composites) cylinder model [45][46][47]. This model discusses (1) anisotropy of the constituents, (2) the effect of interlayer thickness, (3) contributions from the thermal expansion mismatch and (4) irradiation effects.…”

“…This model discusses (1) anisotropy of the constituents, (2) the effect of interlayer thickness, (3) contributions from the thermal expansion mismatch and (4) irradiation effects. Of many models, the analytical method proposed by Oel [47] is adopted due to the perceived applicability to the multilayered interphase structure. In the following analysis, isotropic swelling of SiC and PyC was assumed.…”

Shear properties at the PyC/SiC interface of a TRISO-coating

“…We set a radial stress at the interface as r i in equilibrium. By profiling the distribution of residual stresses [7,8], the radial and hoop stresses are uniformly distributed in the fiber and both stresses are equal to r i . In contrast, the residual stresses in the matrix are expressed as…”