... theory, Journal of Mech. of Solids, 47(1999), pp. 921-933.7. Dao Van Dung, Stability of thin plates with compressible material according to thetheory of elastoplastic processes, Journal of Mech., ... problems of structures subjected to complex loading, Vietnam Journal of Mech., NCST of Vietnam, Vol 22, No 3(2000), pp. 133-148.3. Nhu Phuong Mai and Hoang Si Tuan, Elastoplastic stability of triangular ... TamDepartment of Mathematics, College of Sciences, VNUAbstract. The stability problem of thin triangular plates by the small elastoplasticdeformation theory, was studied in [3]. Basing on the theory of...