Experimental, numerical and analytical study of energy absorbtion in drop weight tear test specimen with chevron notch on API X65 steel

Drop weight tear test (DWTT) is a common experiment to determine the dynamic properties and evaluate the fracture energy of steel specimens. The purpose of present research is presenting experimental, numerical and analytical methods for determination energy transferred to the specimen during impact. Test specimen was cut from an actual spiral seam welded steel pipe with an outside diameter of 1219mm and wall thickness of 14.3mm and then machined to standard size. Then chevron notch was placed in the middle of specimen and test sample was fractured under dynamic loading with initial impact velocity of 6.3m/s. Experiment was impelemented on three specimens by dropping the impactor from 2m height. By drawing and analyzing the energy-displacement and energy-velocity diagrams a linear relation between fracture energy and hammer velocity was. Using this relation by having the impactor velocity in each time, one could evaluate the transferred energy to the specimen and finally the fracture energy of tested specimen. Also, using kinetic energy and potential energy formula by knowing the hammer location and velocity in each time and by neglecting energy losses one could calculate the absorbed energy in the specimen