First-principles based data-driven strain engineering for ferroelectrics via active machine learning: A nonlinear piezoelectric constitutive equation - MINAMI, Susumu; MARUYAMA, Yasuaki; ABE, Yoshimasa; NAKAYAMA, Tomohiro; SHIMADA, Takahiro (Kikai Gakkai ronbunshū = Transactions of the Japan Society of Mechanical Engineers, 2025)