A Novel Diagonal-Cruciform Test Specimen to Evaluate Sheet Formability Rui F. V. Sampaio, João P. M. Pragana, Ivo M. F. Bragança, Carlos M. A. Silva and Paulo A. F. Martins MATEC Web Conf., 408 (2025) 01010 Published online: 07 May 2025 DOI: 10.1051/matecconf/202540801010