Fragmentation and constitutive response of tailored mesostructured aluminum compacts
Fragmentation and constitutive response of tailored mesostructured aluminum compacts
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DOI：
10.1063/1.4945813
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发表时间：
2016-04
影响因子：
3.2
通讯作者：
A. Marquez;C. Braithwaite;T. Weihs;N. Krywopusk;D. Gibbins;K. Vecchio;M. Meyers
中科院分区：
文献类型：
--
作者：
A. Marquez;C. Braithwaite;T. Weihs;N. Krywopusk;D. Gibbins;K. Vecchio;M. Meyers
采用细观粉末压坯在动态条件下研究了铝基压坯的破碎和本构响应，其中粉末之间的界面(尺寸分别为40、100和400μm)在旋压加工过程中被定制。通过爆炸加载在这种材料的环形样品中诱导碎裂，并通过高速摄影、激光干涉测量和碎片软捕获进行检测。记录到的碎片速度约为100m/S。得到的碎片质量分布一般与压坯的界面强度以及粉末尺寸相关。通过引入压坯的断裂韧性，将实验结果与碎裂理论进行了比较，以表征基于材料细观结构的反应粉末的行为。利用Mott理论的一种改进形式计算了平均碎片尺寸，并与实验结果进行了比较。
The fragmentation and constitutive response of aluminum-based compacts were examined under dynamic conditions using mesostructured powder compacts in which the interfaces between the powders (sizes of 40, 100, and 400 μm) were tailored during the swaging fabrication process. Fragmentation was induced in ring samples of this material through explosive loading and was examined through high speed photography, laser interferometry, and soft capture of fragments. Fragment velocities of around 100 m/s were recorded. The fragment mass distributions obtained correlated in general with the interfacial strength of the compacts as well as with the powder size. Experimental results are compared with fragmentation theories to characterize the behavior of reactive powders based on the material's mesostructure by introducing the fracture toughness of the compacts. The mean fragment size is calculated using a modified form of Mott's theory and successfully compared with experimental results.