A NEW ALUMINUM HONEYCOMB CONSTITUTIVE MODEL FOR IMPACT ANALYSES

摘要

A new constitutive model for large deformation of aluminum honeycomb has been developed. This model has six yield surfaces that are coupled to account for the orthotropic behavior of the cellular honeycomb being crushed on-axis and off-axis. Model parameters have been identified to fit uniaxial and biaxial crush test data for high density (38 lb/ft~3) aluminum honeycomb. The honeycomb model was implemented in the transient dynamic Presto finite element code for dynamic impact simulations. In order to extract useful constitutive-parameter information from crush tests, each test configuration and process is simulated with a Presto finite element model to analyze the non-uniform strain/crush behavior within the test samples. Results from the suite of honeycomb crush tests that were used to calibrate the new honeycomb model are shown. Also, the honeycomb model's predictions are compared with test data and with the older Orthotropic Crush Model predictions.