[SY-G2] Multiscale modeling of strength enhancement of aluminium honeycombs under combined shear-compression at high strain rate
Aluminum honeycombs are widely used as sandwich cores in the protective component in transport industry. For example, they are involved in the bird strike shielding as well as in the crashworthiness design, etc. Under impact loading, testing results showed a significant enhancement of the out-of-plane crushing strength of honeycombs with respect to the quasi-static case, which cannot be explained by the rate sensitivity of aluminum alloy.
This paper firstly presents the quasi-static and impact testing results for a series of aluminium honeycombs of different cell sizes (3003 and 5052 alloys). A significantly different strength enhancement of 3003 honeycombs is found from the 5052 ones. In order to understand and model this strength enhancement, a comprehensive numerical investigation with rate insensitive constitutive laws is performed to reproduce the experimental results for different cell size/wall thickness/base materials. In fact, due to the lateral inertia effect under impact buckling, larger strain under impact loading than quasi-static case in the element nears intersectional line is observed. Different ratios of the strain hardening stress over the yield stress of the 3003 alloy from the 5052 alloy lead to the different honeycomb strength enhancements. Finally, aluminum 5052 and 3003 honeycombs are studied under combined shear-compression loading. It was focused on the interaction between the additional shear loading and the lateral inertia effect under the impact loading. It was found that the expansion of the crush envelopes from the quasi-static loading to the dynamic loading was almost homogeneous for the two honeycombs.
Hou B., Zhao H., Pattofatto S., Liu J.G., Li Y.L., 2012, Inertia effects on the progressive crushing of aluminium honeycombs under impact loading, Int. J. Solids & Struct.,, 49 (19-20), 2754-2762.
Hou B., Pattofatto S., Li Y. L., Zhao H., 2011, Impact behavior of honeycombs under combined shear-compression, Part II Analysis, Int. J. Solids & Struct.. 48, 698-705
This paper firstly presents the quasi-static and impact testing results for a series of aluminium honeycombs of different cell sizes (3003 and 5052 alloys). A significantly different strength enhancement of 3003 honeycombs is found from the 5052 ones. In order to understand and model this strength enhancement, a comprehensive numerical investigation with rate insensitive constitutive laws is performed to reproduce the experimental results for different cell size/wall thickness/base materials. In fact, due to the lateral inertia effect under impact buckling, larger strain under impact loading than quasi-static case in the element nears intersectional line is observed. Different ratios of the strain hardening stress over the yield stress of the 3003 alloy from the 5052 alloy lead to the different honeycomb strength enhancements. Finally, aluminum 5052 and 3003 honeycombs are studied under combined shear-compression loading. It was focused on the interaction between the additional shear loading and the lateral inertia effect under the impact loading. It was found that the expansion of the crush envelopes from the quasi-static loading to the dynamic loading was almost homogeneous for the two honeycombs.
Hou B., Zhao H., Pattofatto S., Liu J.G., Li Y.L., 2012, Inertia effects on the progressive crushing of aluminium honeycombs under impact loading, Int. J. Solids & Struct.,, 49 (19-20), 2754-2762.
Hou B., Pattofatto S., Li Y. L., Zhao H., 2011, Impact behavior of honeycombs under combined shear-compression, Part II Analysis, Int. J. Solids & Struct.. 48, 698-705