Evaluation of stress distributions in the geometrical nonlinear regime of composite and FG structures by means of CUF

Demirbaş M. D., Augello R., Xian Yang, X., Carrera E.

MECHCOMP7 - 7th International Conference on Mechanics of Composites, Porto, Portugal, 1 - 03 September 2021, pp.29

  • Publication Type: Conference Paper / Summary Text
  • City: Porto
  • Country: Portugal
  • Page Numbers: pp.29
  • Erciyes University Affiliated: Yes


In many engineering applications, due to overload conditions, large deformations and rotations can appear within working structures. In such cases, residual stresses may occur in the system. Then, for an accurate design process, a rigorous determination of the stress distribution in the nonlinear regime plays a crucial role. To consider these conditions, a geometric nonlinear analysis should be performed. The nonlinear analysis proposed in this study is based on the Carrera Unified Formulation (CUF). CUF offers a hierarchical formulation that considers the order of the structural model as an input of the analysis. Thus, no specific formulation is required to obtain any model. The possibility of producing high-grade structural elements makes it possible to analyze any loading condition, including the postbuckling situation. In addition, CUF can automatically calculate the hardness matrix, making it possible to evaluate laminated structures without any simplification of the three-dimensional (3D) stress tensor. In this study, stress distributions in the geometric nonlinear regime of composite and functionally graded structures are evaluated with CUF. The results are compared with the literature and the success of this approach in evaluating the 3D stress conditions is demonstrated.