Non-alignment effects on the frequency behaviors of sandwich stepped cylindrical shells with auxetic 3D-ARCS core

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2025-03-05 DOI:10.1016/j.tws.2025.113162

Ali Heidari-Soureshjani , Esmail Asadi , Roohollah Talebitooti , Mostafa Talebitooti

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引用次数: 0

Abstract

The present paper focuses on the frequency behavior of sandwich auxetic stepped cylindrical shells with non-aligned mid-surfaces, incorporating three-dimensional augmented re-entrant cellular structures (3D-ARCS) in the core layer. In real-world applications, the radial arrangement of 3D-ARCS in the core layer increases the shell's thickness, necessitating the use of three-dimensional elasticity theory to accurately capture through-thickness stress and strain distributions. Furthermore, this theory facilitates the satisfaction of both radial and meridional continuity at adjacent layers, enabling the creation of an integrated, seamless multi-segmented structure without resorting to simplifications. The effective material properties of the 3D-ARCS core are derived using classical beam theory and a representative unit cell model. Altering the geometric parameters of the 3D-ARCS can modify the effective properties and provide frequency diversity. This research also investigates a specific type of external stepped cylindrical shell that is applicable in mechanical, aerospace, and civil engineering industries. This structure features an auxetic cylindrical shell integrated with a circular flange composed of a bottom face sheet with a functionally graded ceramic-steel material. The validity of the two-directional generalized differential quadrature (2D-GDQ) results is confirmed through experimental testing on a simplified isotropic model, FEM model of a 3D-ARCS auxetic sandwich cylindrical shell, and relevant research. Subsequently, the effects of several key parameters are studied.

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来源期刊

Thin-Walled Structures 工程技术-工程：土木

CiteScore

9.60

自引率

20.30%

发文量

801

审稿时长

66 days

期刊介绍： Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses. Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering. The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.