| METALS AND METAL MATRIX COMPOSITES |
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| Dynamic Performances of Graded Honeycomb Materials Containing Random Defects Under Impact Loading |
| HU Jun1, REN Jianwei1, MA Wei1, LIU Jianhua1, WANG Aiguo2 1
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Anhui Key Laboratory of Architectural Structure and Underground Engineering of Anhui Architecture University, Hefei 230601
2 The Key Advanced Building Materials Laboratory of Anhui Architecture University, Hefei 230601 |
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Abstract It is inevitable for honeycomb metal materials to generate graded density and random defects during its producing process. Based on the material gradient and random defects, this work investigated the dynamic performances of honeycomb materials with variable gradients and random defect contents. A coefficient, homogeneous deformation index Φ, was proposed to evaluate the deformation modes of materials with diffe-rent load conditions. The results could be concluded that: ⅰ When honeycombs are intact, the crushing mode of unilayer honeycomb presents a X-shaped mode and that of multilayer honeycombs presents a V-shaped mode under low speed impact loading(v=20 m/s); under high speed impact loading(v=60 m/s), honeycomb materials exist crushing bands caused by inertia around impact end, and exist V-shaped deformation bands in zone where the relative density of honeycombs is weaker. When honeycombs contain random defects, its deformation modes are distri-buted diffusely. ⅱ Moderate random defects and honeycomb gradient could improve its deformation uniformity, and reduce its index of Φ. ⅲ The plateau stresses of honeycombs decrease as its gradient increase when honeycombs are subjected to low-speed impact loading, while increases as its gradient increases when subjected to high-speed impact loading. Meanwhile, the plateau stresses decrease as random defects increase if the content of defects do not exceed 15%; and the plateau stresses will decrease sharply if the content of random defects exceed 15%. And in this stage, the content of random defects in honeycombs is the main factor for material's dynamic performances.
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Published: 12 July 2019
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| Fund:This work was financially supported by the National Natural Science Foundation of China (51778003), the Key Program of Anhui Provincial Educational Department College Natural Science Foundation (KJ2017A486). |
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2019, Vol. 33 
