An optimal design of internal pressurized stiffened conical shell is investigated using the genetic algorithm (GA) to minimize the structural weight and to prevent various types of stress and buckling failures. Axial compressive load is applied to the shell. Five stress and buckling failures as constraints are taken into account. Using the discrete elements method as well as the energy method, ...

In this paper, we propose a novel design and fabrication strategy to produce architected core structures for use as the in composite sandwich structures. A traditional foam or honeycomb structure is lightweight stiff, but susceptible permanent deformation when subjected excessive loading. Here of an composed arrays hollow truncated cone unit cells that dissipate energy exhibit structural recove...

Sandwich structures with thin, strong skin layers on both sides of a thick, compliant and light core combine low weight, high bending stiffness, high strength and high buckling resistance. These structures find use in many applications such as aircraft, marine applications and wind turbine blades. When used for wind turbine blades the sandwich structures are mainly made from FRP laminate skins ...

This paper presents a series of approaches for discrete time-domain synthesis of conical bore instrument sounds. The generation of steady, selfsustained oscillations using conical waveguides is complicated by properties inherent to truncated conic frusta. Two different physical structures are discussed which can be characterized by the same circuit diagram. A more abstract and flexible “virtual...

A comprehensive study of the silicon nanowire growth process has been carried out. Silicon nanowires were grown by plasma-assisted-vapor-solid method using tin as a catalyst. We have focused on the evolution of the silicon nanowire density, morphology, and crystallinity. For the first time, the initial growth stage, which determines the nanowire (NW) density and growth direction, has been obser...

Rocket fairings, load-carrying structures of solid rocket motor case, e.g., inter-stage joint, satellite-rocket joint, etc., usually take the shape of conical shell sections. This paper is to evaluate spatially distributed microscopic control characteristics of distributed actuator patches bonded on conical shell surfaces. The converse effect of piezoelectric materials has been recognized as on...