DYNAMIC FORCE MEASUREMENT TECHNIQUES IN SPLIT HOPKINSON PRESSURE BAR TESTING OF LOW ACOUSTIC IMPEDANCE MATERIALS USED AS ARMOR INTERLAYER MATERIALS A Thesis Submitted to the Graduate School of Engineering and Sciences of Ġzmir Institute of Technology in Partial Fulfillment of the Requirements for the Degree of MASTER OF SCIENCE in Mechanical Engineering by Ali Kıvanç TURAN July 2012 ĠZMĠR