Monday  |  Pine/Spruce  |  10:40 AM–11:00 AM

#18024, Energy Absorption Properties of Open-Cell Rhombic Dodecahedron Cellular Lattice Structures under Shock Compression

The shock response of cellular lattice structures, such as open-cell rhombic dodecahedron is quite complex due to wave propagation and interactions along the lattice structure as the material is compressed at high strain-rates. To develop a fundamental understanding of the mechanical behavior of these cellular lattice structures under dynamic extreme conditions such as those experienced under shock compression, we employ both Ti-6Al-4V alloy and 4340 steel with open-cell rhombic dodecahedron. A series of in-situ time-resolved coupled with high-speed videography and ex-situ recovery shock experiments were conducted via light gas guns using the normal plate impact loading configuration. Although the mechanical behaviors of both materials were distinctly different, it was evident from the experimental results that both materials with open-cell rhombic dodecahedron lattice structure act as effective shock wave disruptors. That is, the input shock wave was completely disrupted as it traverses through the open-cell rhombic dodecahedron lattice structure and both materials exhibit significant energy absorption properties. These properties will make open-cell rhombic dodecahedron lattice structures very attractive to armor designers.

Christopher Meredith   DEVCOM US Army Research Laboratory