Variational analysis on therm-elastical stresses of plane strain problem of thermal barrier coating structure in laser radiate

Present fundamental equations of thermoelastic deformation of thermal barrier coating(TBC) irradiated by laser in the condition of plane strain. Series solutions of steady temperature field are derived. Thermoelastic stress field in TBC is studied by means of variational principle of complementary energy. The distributed characters of maximal stresses and interfacial ones and the effects of some physical parameters on stresses are investigated. The results show that the main factor caused destroy of TBC is tensile stress; The interfacial stresses are comparatively feeble, but concentrate at the free edge; The peeling stresses are stronger than shearing ones and are important reason for failure of coating. Increase of coating’s thickness changes the distribution of stresses in the directio