Impact performance of egg-box core sandwich panels made from sisal fibers and castor-oil-based polymer - Santos, Júlio C dos; Silva, Rodrigo da; Christoforo, André L; Freire, Rodrigo Teixeira Santos; Tarpani, José Ricardo; Scarpa, Fabrizio; Panzera, Túlio Hallak (Polymer Composites, 2024)