Session: 01-07-01: Nonlinear Problems in Aerospace Structures

Paper Number: 106606

106606 - Post-Buckling Analysis of Stringer-Reinforced Composite Wing Panel by Classical and Cuf-Based Finite Elements and Effect of Material and Geometrical Uncertainties 

The design of reinforced composite aerospace structures and the choice of safety margins are strongly affected by our predictive capability. The analysis of buckling and many other failure mechanisms require the use of mathematical models able to capture 3D complex internal stress states, which is a major concern in composite laminates and represents a challenge of today structural simulations. In this work, a detailed model to characterize the post-buckling behaviour and the stress state of a stringer-reinforced composite wing panel subjected to uniform compression is proposed. The model under consideration has layerwise capabilities and is based on the Carrera Unified Formulation (CUF) [1]. According to CUF, refined structural theories can be formulated automatically as a generalization of the three-dimensional equilibrium equations and by making use of arbitrary expansion of the primary unknowns, which can be either distributed along 1D (CUF beam models) or 2D (CUF plate models) supports. Depending on the choice of the expansion functions, low- to high-order structural theories can be developed in a unified manner. Particular attention is focussed on the effect of material and geometry uncertainties on the characterization of the limit load [2], bifurcations, post-buckling and failure.  The numerical results clearly show the advantages of the proposed method and provide good confidence for further experimental testing to justify the use of opportune models able to predict and mimic the stochastic dispersion.

REFERENCES

[1]     E. Carrera, M. Cinefra, M. Petrolo, and E. Zappino, Finite Element Analysis of structures through Unified Formulation, Wiley & Sons., (2014).

[2]     P.H. Cabral, E. Carrera, H.E.A.A. dos Santos, P.H.G. Galeb, A. Pagani, D. Peeters, A.P. Prado, Experimental and numerical vibration correlation of pre-stressed laminated reinforced panel, Mechanics of Advanced Materials and Structures, 29(15):2165-2175.

Presenting Author: Riccardo Augello Politecnico di Torino

Presenting Author Biography: Riccardo Augello is a researcher at Politecnico di Torino. He obtained his Bachelor's degree in Mechanical Engineering from Politecnico di Torino in 2014 by discussing a thesis on the evaluation of the dissipated power of Gaussian specimen in very-high-cycle fatigue tests. Afterward, he earned a Master of Science degree in Mechanical Engineering from Politecnico di Torino in 2016. His master thesis topic was “Multibody simulation of landing mission phases for robotic exploration”, which was undertaken after an Internship period at Thales Alenia Space.

Riccardo Augello started working at Politecnico di Torino in January 2017 under the supervision of Prof. Erasmo Carrera, and he started his Ph.D. program in Mechanics in November 2017. His doctoral project was about micropolar theories and was carried out in collaboration with the City University of Hong Kong, where he spent six months in 2019.

In the framework of PRE-ECO, Riccardo is developing advanced theories based on nonlocal mechanics, including the geometrical nonlinear analysis for the large deflection and post-buckling of composite structures.

Authors:

Pedro H. Cabral Embraer S.A.
Alex P. Do Prado Embraer S.A.
Alfonso Pagani Politecnico Di Torino
Riccardo Augello Politecnico di Torino
Erasmo Carrera Politecnico di Torino