? Abstract:
Bending analysis of the most slender structures can be effectively performed using one-dimensional beam models. These models are literally formulated upon some simplifying assumptions on the behaviour of cross section, which lead to parameters that vary only along the beam axis. The most frequently employed classical theories are Euler-Bernoulli (EBBT) -- which assumes plane sections remain plane and perpendicular to the neutral axis during bending -- and Timoshenko (TBT) -- which retains only the assumption that the cross sections remain plane during bending and therefore allows for constant transverse shear deformation. In spite of low computational cost, the classical beam models are often inadequate to simulate the kinetic behaviour of slender thin-walled structures. In particular, the modelling of the structure behaviour under bending load is a challenging task, as the global response is governed by the localised instabilities arise during folding and unfolding.
In this talk, I will present a refined unified nonlinear finite element formulation for efficient modelling of slender thin-walled structures, capable of matching different refinements in different cross sections. The main advantage of this formulation is that it enables the higher order beam theories of regions such as the fold where greater refinement is required whilst retaining the computational efficiency offered by the technique. In addition, the arc-length method is combined with automatic increments, to overcome the difficulty for efficient simulating of the highly nonlinear behaviour of the structure under bending loading — which is a combination of geometric nonlinearity, post-buckling and (in the case of the hollow slender structures) internal contact.
? Bio:
Dr Zahra Soltani is currently a Research Associate in the Aerospace Structures group in the Department of Aeronautics, Imperial College, London. She studied Aerospace Engineering for her Bachelor's and Master's degrees at Sharif University of Technology, from where she also obtained a PhD in Aerospace Structures in 2019. She spent one year as a visiting researcher in the Laboratory of Composite Materials and Adaptive Structures (CMASLab) at ETH in 2017 as part of her PhD study. Upon finishing her PhD, she joined Imperial College in 2019. Zahra's research background is mainly related to developing efficient and robust tools for the nonlinear and/or instability analysis of compliant structures and their optimum design. Her research interests include soft materials, geometrically nonlinear analysis, composite structures, deployable structures, adaptive mechanisms, Bayesian optimization, and machine learning.
? روز سهشنبه - 23 آذر ماه
⏰ ساعت 13
? اتاق مجازی انجمن علمی هوافضا شریف: https://vc.sharif.edu/ch/aero-stu
