Large-deflection analysis of composite and FGM thin-walled beams under thermal pre-stresses


Filippi M., Augello R., Demirbaş M. D. , Carrera E.

MECHCOMP7-7th International Conference on Mechanics of Composites, Porto, Portugal, 1 - 03 September 2021, pp.26-27

  • Publication Type: Conference Paper / Summary Text
  • City: Porto
  • Country: Portugal
  • Page Numbers: pp.26-27

Abstract

In some applications, working structures, such as rotor shafts, can be simultaneously exposed to mechanical and thermal loads. Moreover, due to extreme service conditions, mechanical loads may induce large deflections and rotations within the structure, so an accurate evaluation of the geometrically nonlinear behavior of the structure is mandatory for an ac- curate design of such components. Finally, the thermal condition causes pre-stresses that afflict the static nonlinear equilibrium path, so they need to be included within the analysis. The moderns techniques rely on three-dimensional (3D) Finite Element (FE) models for the numerical simulation of such structures (see [1]). Despite significant advances in computing power, complex three-dimensional (3D) Finite Element (FE) models still impose large computational costs, especially during the iterative design stage. For this reason, reduced refined models may be used to obtain solutions with lower computational efforts The proposed methodology for the structural analysis of components subjected to thermal pre-stressed and large-deflections was built in the framework of the Carrera Unified Formulation (CUF) ([2]). This methodology, according to which the 3D displacement field can be evaluated as an arbitrary expansion of the unknowns evaluated through the FE method, is extremely suitable for this analysis. In fact, every component or layer within the structure can have its own kinematic described independently from the others, without the need for any ad-hoc theory implementation. As a matter of fact, one can evaluate the influence of pre-stress, material properties, and geometric characteristics in a unified manner. Arch-type structures are analyzed, comparing obtained results with those provided from literature and experimental tests. The results establish and report graphs showing the effects of the reinforcements on the overall behavior of the components, with the aim of providing a reliable starting point for the future design of the structure in the civil engineering field. References: [1] M. Zhuo, L.H. Yang, and L. Yu. The steady-state thermal effect on rotor dynamics of a rod-fastened rotor-bearing system. In ASME International Mechanical Engineering Congress and Exposition, Volume 46483, page V04BT04A014. American Society of Mechanical Engineers, 2014. [2] E. Carrera, M. Cinefra, M. Petrolo, and E. Zappino. Finite element analysis of structures through unified formulation. John Wiley Sons, 2014.