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THE JET MORPHOLOGY OF SQUARE CROSS-SECTION SHAPED CHARGE WITH AN INSCRIBED CIRCLE DIAMETER OF 56MM WAS OBSERVED BY CONDUCTING AN X-RAY EXPERIMENT. DEPTH-OF-PENETRATION TESTS AT STANDOFFS 80 AND 160 MM WERE ALSO CARRIED OUT. THE EXPERIMENTAL RESULTS ARE COMPARED WITH THE CIRCULAR CROSS-SECTION SHAPED CHARGE WITH SAME INSCRIBED CIRCLE DIAMETER. BASED ON THE SMOOTHED PARTICLE HYDRODYNAMIC METHOD IN AUTODYN SOFTWARE, THE RELEVANT NUMERICAL SIMULATIONS WERE CARRIED OUT. THE RESULTS SHOWED THAT THE JET OF SQUARE CROSS-SECTION SHAPED CHARGE CONSISTS OF A CONDENSED PART AND A NON-CONDENSED PART. THE CONDENSED PART HAS SIMILAR CHARACTERISTICS TO THE CORRESPONDING PART OF CIRCULAR CROSS-SECTION SHAPED CHARGE. AND THE NON-CONDENSED PART IS DISTRIBUTED AT THE JET TAIL. THE NON-CONDENSED PART CONSISTS OF A MAIN FLUID MOVING ALONG THE AXIS AND FOUR OFF-AXIS FLUIDS WITH OFF-AXIS VELOCITY ALONG THE SYMMETRY PLANE. THE NON-CONDENSING OF JET MAKES THE PENETRATION ABILITY OF THE SQUARE CROSS-SECTION SHAPED CHARGE LOWER THAN THAT OF THE CIRCULAR CROSS-SECTION SHAPED CHARGE, THE DECREASING RATE OF PENETRATION DEPTH INCREASED FROM 2.67% TO 17.3% WHEN THE STANDOFF IS INCREASED FROM 80 MM TO 160 MM. WHEN THE INSCRIBED CIRCLE DIAMETER OF THE CROSS-SECTION INCREASES TO 67.2 MM (1.2 TIMES OF 56 MM) AND THE LINER STRUCTURE REMAINS THE SAME, THE SQUARE CROSS-SECTION SHAPED CHARGE WILL FORM A COHESIVE JET.
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