The grain orientation effects on crack-tip fields for additively manufactured titanium alloy: A peridynamic study

•A macroscale description method for grain orientation effects in α-phase additively manufactured titanium alloy is proposed.•The capability of peridynamics to study crack-tip fields is verified by the displacement extrapolation method.•The grain orientation distributions have an impact on the crack-tip fields as well as crack growth behaviors. In this work, a macroscale description method for grain orientation effects in α-phase additively manufactured titanium alloy is proposed within peridynamic framework, and peridynamic simulations of grain orientation effects on crack-tip fields are performed. The proposed method describes the grain orientation effects by introducing anisotropic peridynamic parameters which are later calibrated according to strain energy density. Then, stationary crack-tip fields in single-crystal model, stationary crack-tip fields in polycrystalline model, and crack-tip fields at branching in polycrystalline model are respectively simulated, whose results are analyzed in detail as well as compared with experimental observations. In the end, some discussions and further considerations are presented, which indicates our efforts to future works. The proposed method may help develop a way to reveal interactive relationships among grain features, crack-tip fields and crack propagation behaviors.