Elastic structural response of prismatic metal sandwich tubes to internal moving pressure loading

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:46

Article

Zhou, Jiaxi¹  Deng, Zichen^1,2  Liu, Tao¹  Hou, Xiuhui¹ 

[1] NW Polytech Univ, Dept Engn Mech, Xian 710072, Peoples R China

[2] Dalian Univ Technol, State Key Lab Struct Anal Ind Equipment, Dalian 116024, Peoples R China

关键词: Prismatic sandwich tube;    Homogenization;    Dynamic structural response;    Transient analytical model;    Steady state model;   

DOI  :  10.1016/j.ijsolstr.2009.01.017

来源: Elsevier

【 摘 要 】

The analytical and numerical modeling of the structural response of a prismatic metal sandwich tube subjected to internal moving pressure loading is investigated in this paper. The prismatic core is equivalent to homogeneous and cylindrical orthotropic solids via homogenization procedure. The sandwich tube with the effective homogenized core is modeled using multi-layer sandwich theory considering the effects of transverse shear deformation and compressibility of the core; moreover, the solutions are obtained by using the precise integration method. Several dynamic elastic finite element (FE) simulations are carried out to obtain the structural response of the tube to shock loading moving at different velocities. The comparison between analytic solutions and FE simulations demonstrates that the transient analytical model, based on the proposed sandwich model, is capable of predicting the critical velocity and the dynamic structural response of the sandwich tube with the effective homogenized core with a high degree of accuracy. In addition, the critical velocity predicted using FE simulations of the complete model is not in agreement with that of the effective model. However, the structural response and the maximum amplification factors obtained using FE simulations of the complete model are nearly similar to that of the effective model, when the shock loading moves at the critical velocity. The influences of the relative density on the structural response are studied, and the capabilities of load bearing for sandwich tubes with different cores are compared with each other and with the monolithic tube. The results indicate that Kagome and triangle-6 are preferred among five topologies. (C) 2009 Elsevier Ltd. All rights reserved.

【 授权许可】

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