TY - JOUR
T1 - Dynamic response of aluminum corrugated sandwich subjected to underwater impulsive loading
T2 - Experiment and numerical modeling
AU - Huang, Wei
AU - Zhang, Wei
AU - Huang, Xianglin
AU - Jiang, Xiongwen
AU - Li, Ying
AU - Zhang, Lei
N1 - Publisher Copyright:
© 2017
PY - 2017/11
Y1 - 2017/11
N2 - The aluminum sandwich structures with the trapezoidal corrugated core subjected to underwater impulsive loadings are studied experimentally and numerically in the present study. The blast resistance in terms of dynamic deformation, failure modes and associated mechanisms is evaluated in relation to the load intensity, and the core height under air-backed and water-backed conditions. 3D digital imaging correlation and postmortem analysis are employed to investigate the deformation and failure of individual components, focusing on the effects of loading intensities, core height and loaded condition. The discrepancy in bending stiffness along the x-direction and y-direction results in the asymmetrical propagation of plastic hinges and the crack initiates and propagates along the x-direction. Although the core height affects the response rate and the local tendency of deformation greatly as the impulses increase, the core height has a limited influence on the deflection resistance when the corrugated sandwich panels have the same areal mass. The critical impulse for tearing failure of sandwich with higher core height is much smaller than that of panels with lower core height. Due to the resistance and reaction in backwater column, the transverse deflection does not increase monotonously to the increasing core heights and impulses under water-backed condition. The corrugated sandwich panels suffer significantly smaller inner face deflections than the solid plates of identical mass per area under air-backed condition, while all plates involved show approximate blast-resistance performance under water-backed condition.
AB - The aluminum sandwich structures with the trapezoidal corrugated core subjected to underwater impulsive loadings are studied experimentally and numerically in the present study. The blast resistance in terms of dynamic deformation, failure modes and associated mechanisms is evaluated in relation to the load intensity, and the core height under air-backed and water-backed conditions. 3D digital imaging correlation and postmortem analysis are employed to investigate the deformation and failure of individual components, focusing on the effects of loading intensities, core height and loaded condition. The discrepancy in bending stiffness along the x-direction and y-direction results in the asymmetrical propagation of plastic hinges and the crack initiates and propagates along the x-direction. Although the core height affects the response rate and the local tendency of deformation greatly as the impulses increase, the core height has a limited influence on the deflection resistance when the corrugated sandwich panels have the same areal mass. The critical impulse for tearing failure of sandwich with higher core height is much smaller than that of panels with lower core height. Due to the resistance and reaction in backwater column, the transverse deflection does not increase monotonously to the increasing core heights and impulses under water-backed condition. The corrugated sandwich panels suffer significantly smaller inner face deflections than the solid plates of identical mass per area under air-backed condition, while all plates involved show approximate blast-resistance performance under water-backed condition.
KW - Blast resistance
KW - Corrugated sandwich
KW - Dynamic failure
KW - Fluid-structure interactions
UR - http://www.scopus.com/inward/record.url?scp=85020696464&partnerID=8YFLogxK
U2 - 10.1016/j.ijimpeng.2017.06.002
DO - 10.1016/j.ijimpeng.2017.06.002
M3 - Article
AN - SCOPUS:85020696464
SN - 0734-743X
VL - 109
SP - 78
EP - 91
JO - International Journal of Impact Engineering
JF - International Journal of Impact Engineering
ER -