Strain and stress states of laminated plates subjected to mechanical and hygrothermal loads

Nowadays different composite layered structures have been intensively used in civil and industry engineering. Layered structures as well as laminated plates are cheap in comparison with traditional materials, so they have been very popular in practice. The usage of the analytical theory for such kind of plates and beams is a complicated and un-universal problem for a real engineer, whereas numerical methods and composed simulations by computational algorithms are not devoid of many difficulties. The main objective of the proposed investigations - on the basis of the analytical expressions from the classical theories to propose practically easy and exact solution method for the strain and stress state analysis of the laminated plates. The presented analytical model can exactly describe the mechanical parameters for each of nodes on the surface and inside of a laminated plate, which is affected by external membrane and bending loads and, additionally, by influences of the temperature and atmospheric humidity. Such kind of analysis describes this problem for the whole plate as well as for each of its layers. The proposed paper consists of a review of the existing solution methods of the laminated plates and stress/strain analysis problem in case, in cases when the plates are subjected to various technological and atmospheric influences. The calculation results for many examples are presented. The conclusions are drawn and the most important results are given. Besides some recommendations for application of the proposed method to layered structures are presented.