IN-TARGET RADIAL STRESS MEASUREMENTS FROM PENETRATION EXPERIMENTS INTO CONCRETE BY OGIVE-NOSE STEEL PROJECTILES

We conducted three penetration experiments of a hardened 4340 steel pr ojectile with a length-to-diameter ratio of 7 into concrete targets ha ving an unconfined compressive strength of 43 MPa. The targets were ea ch cast with six flatpack stress gages oriented to measure radial stre ss and positioned at various depths and radii from the penetration pat h. The experiments provide researchers with quality data that can be u sed to validate first-principle codes and to better understand the pen etration mechanics in brittle, porous materials. Additional tests are recommended at other striking velocities and gage locations to further quantify stress within concrete targets. (C) 1997 Elsevier Science Lt d.