High-strain-rate behavior of maraging steel linear cellular alloys: Mechanical deformations

The high-strain-rate deformation response of 25% dense linear cellular alloy (LCA) structures made from high-strength high-toughness maraging 250 steel is investigated. Constitutive parameters for the Johnson–Cook strength model for this steel are determined and validated by correlating final and transient deformation states obtained from experiments on solid maraging 250 steel cylinders impacting a rigid high-strength steel anvil, with those predicted using AUTODYN-3D Lagrangian based finite element simulations. The constitutive parameters are then used to predict the deformation response of a 9-cell waffle-design LCA under axial impact against a rigid anvil. Experiments performed on the LCA structure under the same impact conditions reveal that the qualitative deformation response correlates well with simulations, indicating the unique response of the LCA structures is well captured by the validated Johnson–Cook model parameters.