On the influence of one-point-bend impact test parameters on dynamic stress intensity factor variation

Mathematical model of the specimen deformation during one-point-bend impact test is proposed. Using mode superposition technique, a closed form solution for dynamic stress intensity factor (DSIF) variation with time is derived. Parameters used in this formula are determined for plane stress finite element model of the specimen. Theoretical DSIF-time curve is compared with experimental one registered by Bِhme and Kalthoff using caustics method. Influence on DSIF of the specimen geometry parameters and specimen-striker contact stiffness is investigated. It is shown that increasing of contact stiffness causes increasing DSIF growth rate. Increasing crack relative depth and/or specimen length leads to higher maximum DSIF values.