期刊
THIN-WALLED STRUCTURES
卷 78, 期 -, 页码 70-78出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.tws.2014.01.017
关键词
Corrugated; Compression; Simulation; Multilayer; Sandwich
The axial crushing responses of bonded and brazed multi-layer 1050 H14 trapezoidal aluminum corrugated core (fin) sandwich structures, with and without aluminum interlayer sheets in 0 degrees/0 degrees and 0 degrees/90 degrees core orientations, were both experimentally and numerically investigated at quasi-static and dynamic strain rates. Multi-layering the core layers decreased the buckling stress and increased the densification strain. The experimental and simulation compression stress-strain curves showed reasonable agreements with each other. Two main crushing modes were observed experimentally and numerically: the progressive fin folding and the shearing interlayer aluminum sheets. Both, the simulation and experimental buckling and post-buckling stresses increased when the interlayer sheets were constraint laterally. The multi-layer samples without interlayer sheets in 0 degrees/90 degrees core orientation exhibited higher buckling stresses than the samples in 0 degrees/0 degrees core orientation. The increased buckling stress of 0 degrees/0 degrees oriented core samples without interlayer sheets at high strain rate was attributed to the micro-inertial effects which led to increased bending forces at higher impact velocities. (C) 2014 Elsevier Ltd. All rights reserved.
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