4Obata Y, Noda N. Steady thermal stresses in a hollow cir- cular cylinder and a hollow sphere of a functionally gradient material[J].Thermal stresses,1994,17:471- 487.
5Tanigawa Y, Akai T , Kawamura R, et al. Transient heat conduction and thermal stress problems of a nonhomogeneous plate with temperature dependent material properties[J].Thermal Stresses,1996,19:77-102.
