Experimental and theoretical investigation on vibration of laminated composite conical-cylindrical-combining shells with elastic foundation in hygrothermal environment

• Published in: Composite structures Vol. 323; p. 117470
• Main Authors: Wang, Chenguang, Song, Xuyuan, Zang, Jian, Zhang, Yewei
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.11.2023
• Subjects: Composite conical-cylindrical-combining shell; Elastic boundaries; Experiment investigation; Hygrothermal environment; Elastic boundaries; Hygrothermal environment; Composite conical-cylindrical-combining shell; Experiment investigation
• ISSN: 0263-8223; 1879-1085
• DOI: 10.1016/j.compstruct.2023.117470

•Present a theoretical mode for the vibration of CCCCSs in hygrothermal load.•Explain the mechanism of joint stiffness on the coupled form of the structure.•Revealed the dynamic sensitive temperature scope of CCCCSs. The present investigation focuses on the vibration of composite conical-cylindrical-combining shells (CCCCSs) subjected to elastic supports and hygrothermal effects by means of experimental and theoretical investigation. The kinetic energy, potential energy and hygrothermal potential energy are derived via the Donnell shell hypothesis. A set of elastic springs are introduced to the free edges of the CCCCSs aiming to simulate the elastic supports and the interface of the two shell. The dynamic equations of laminated CCCCSs with elastic supports in hygrothermal environment have been obtained in frame of Rayleigh-Ritz method by means of a set of modified orthogonal polynomials as the proper admittance displacement functions. Several experimental and finite element simulation research projects were carried out to validate the effectiveness of the proposed analytical strategy. The unique vibration characteristics of CCCCSs with respect to various temperature, humidity, interfacial bonded stiffness and elastic boundary conditions are thoroughly discussed. The results indicated that the coupling phenomenon performs obviously with the increase of the interface joint stiffness of the structures. Furthermore, the effect of the thermal load on the vibration of CCCCSs become more obviously during some specific temperature range which is determined by the mechanics of the material and manufactured scheme.