Vol. 9, No. 4, 2014

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ISSN: 1559-3959
Collapse mechanisms of metallic sandwich structures with aluminum foam-filled corrugated cores

Bin Han, Lei L. Yan, Bo Yu, Qian C. Zhang, Chang Q. Chen and Tian J. Lu

Vol. 9 (2014), No. 4, 397–425
Abstract

The physical mechanisms underlying the beneficial effect of filling aluminum foams into the interstices of corrugated plates made of stainless steel were explored with finite element (FE) simulations. Relative to unfilled corrugated plates of equal mass, this effect was assessed on the basis of elevated peak stress and enhanced energy absorption under quasistatic out-of-plane compression. Upon validating the FE predictions against existing measurements, the influence of key geometrical and material parameters on the compressive response of foam-filled corrugated plates was investigated. Different from the traditional buckling modes of empty corrugations, four new buckling modes were identified for foam-filled corrugations. Based upon these deformation modes of post-buckling, collapse mechanism maps were constructed. Due to the additional resistance provided by foam filling against buckling of the corrugated plate and the strengthening of foam insertions due to complex stressing, both the load bearing capacity and energy absorption of foam-filled sandwiches were greatly enhanced.

Keywords
foam-filled corrugated core, finite element method, buckling, collapse mechanism
Milestones
Received: 10 December 2013
Revised: 28 March 2014
Accepted: 30 April 2014
Published: 19 October 2014
Authors
Bin Han
State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace
Xi’an Jiaotong University
Xi’an, 710049
China
Lei L. Yan
State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace
Xi’an Jiaotong University
Xi’an, 710049
China
Bo Yu
State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace
Xi’an Jiaotong University
Xi’an, 710049
China
Qian C. Zhang
State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace
Xi’an Jiaotong University
Xi’an, 710049
China
Chang Q. Chen
Department of Engineering Mechanics, CNMM & AML
Tsinghua University
Beijing, 100084
China
Tian J. Lu
State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace
Xi’an Jiaotong University
Xi’an, 710049
China