A data-driven ductile fracture criterion for high-speed impact

• This research proposes a data-driven fracture criterion to characterize the ductile fracture behavior subjected to high-speed impact loading conditions. • The decoupled assumption is introduced to reduce the required training dataset. • A logarithmic function is incorporated to enhance the predictability capability for unknown high strain rate. • The proposed data-driven fracture criterion is validated using both notched specimen cases and ballistic impact cases of Ti-6Al-4 V. Data-driven methods based on machine learning (ML) models offer new approaches for characterizing the fracture behavior of advanced elastoplastic materials. In this paper, a ML-based data-driven ductile fracture criterion is proposed to characterize the fracture behavior of elastoplastic materials under high-speed impact loading conditions. To reduce the required training dataset and enhance the predictability capability, several assumptions are used. Firstly, utilizing the decoupled assumption, two separate artificial neural network (ANN) models are employed to establish the fundamental fracture model and characterize the strain rate effect of ductile fracture behavior respectively. In addition, the enhanced method with a logarithmic function is introduced to improve predictability capability of the proposed data-driven criterion under known high strain rates. To establish a complete numerical implementation framework, an enhanced rate-dependent data-driven constitutive model and a compatible numerical implementation algorithm are additionally introduced. Eventually, to assess the applicability of the proposed data-driven fracture criterion, numerical simulations of notched specimen cases and ballistic impact cases of Ti-6Al-4 V material are conducted, respectively. These investigation results demonstrate the effectiveness of the proposed data-driven ductile fracture criterion.