A Magnetic Method of Detecting Shell Casing Defects.

摘要

The report presents the results of a technique used to detect defects in shell casings manufactured under the Small Caliber Ammunition Modernization Program. The method of detecting defects is based on the fact that a magnetic flux field is produced about a conductor carrying a current. The technique for testing shell casings was evaluated in the laboratory of 5.56caliber shell casings. The results of the laboratory tests proved that the magnetic field check is not sensitive to small defects. The lack of sensitivity is due to the fact that the magnetic field about a defect failed to follow the shape of the defect but rather tended to form a concentric symmetrical pattern. (Modified author abstract)