Finite Elements in Analysis and Design

Riveted assemblies play a crucial role in the strength and failure of aeronautical structures subjected to shock and impact. The finite element evaluation of stress concentrations in these zones necessitate accurate modeling of both the full-scale structure and the local assembly zone to evaluate the structure survivability. To address this challenge, an approach based on the modeling of the asse…

This paper proposes a topology optimization method that accounts for tool accessibility, including tool direction and depth constraints, in multistage machining processes. Although additive manufacturing provides a high degree of design freedom, it often produces rough surfaces. To overcome this limitation, a hybrid approach that appropriately integrates machining processes is advantageous. Howev…

This study presents an optimization method using cellular structures to mitigate dynamic instability. Dynamic instability, characterized by positive real parts of complex eigenvalues, arises from asymmetric system matrices. It often leads to problematic squeal noise and severe vibrations in engineering systems. The conventional optimization approach of cellular structures consists of three main s…

Auxetic metamaterials, characterized by a negative Poisson’s ratio, exhibit distinctive deformation mechanisms that make them attractive for applications requiring enhanced energy absorption and stiffness control. In this work, a quasi-static compression test is performed on a 3D-printed coupon based on the General Auxetic Metamaterial (GAM) cell to experimentally characterize its global response…

The main goal of this work involves conducting numerical simulations to determine the vibrational behavior of composite shell structures. The introduction of doubly-curved laminated shells plays a pivotal role in diverse engineering applications, offering an expanded design space and the potential to enhance mechanical performance. However, the analysis of this kind of structures poses significan…

The fineness of element meshes strongly affects the accuracy and cost of solutions in computational mechanics. In this regards, an accurate coarse mesh-based analysis approach (CMA) for nonlinear bending and post-buckling problems of plates and shells utilizing nonlinear auto-regressive exogenous Bayesian neural networks (NARX-BNNs) is first proposed in this work. The CMA approach comprises two p…