The present contribution deals with a two-layered composite structure weakened by an interface penny-shaped crack under the action of couple of concentrated heat sources at the vicinity of the defect. The corresponding 3D stationary thermoelasticity problem is formulated within the framework of linear thermoelasticity with microlocal parameters. By constructing the appropriate representations of the temperature, displacements and stresses through some harmonic functions, the resulting boundary value problem is reduced to some mixed problem of potential theory that leads to singular integro-differential equation of Newton's type. Its approximated solution is obtained by using the analogue of Dyson's theorem. The stress intensity factors are determined. The influence of the properties of the subsequent layers on SIF is examined.
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