Strain Rate Effects in Metallic Cellular Materials
نویسندگان
چکیده
The high strain rate behavior of two cellular materials was investigated using a quasi-static loading stage and a Kolsky bar apparatus. The yield stress of these core materials under dynamic loading was found higher than in quasi-static loading. However, the plateau stress after yielding is not so sensitive to strain rate. For Aluminum foam materials, the deformation was more localized for quasi-static loading than under dynamic loading, where the collapse of cells was more distributed. Several failure modes were found in topologically structured cellular core (tetragonal truss), and these modes are strongly dependent on initial defects.
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