METHOD OF EVALUATION OF THE LIFE OF STEEL CASES OF ARTILLERY SHELLS Russian patent published in 2018 - IPC F42B35/00 G01N27/72 

FIELD: weapons and ammunition.

SUBSTANCE: invention relates to artillery ammunition and can be used in evaluating the life of steel shell cases after long periods of storage. Essence: coercive force is measured on all shell cases, without their dismantling, in close proximity to the leading belt on the case. Measurement is performed by scanning the case area along the entire belt, both on both sides of the belt. Average value of the coercive force in the cases for the whole batch is determined. Shells, on the cases of which the coercive force is more than 20 % higher than the average value in the batch, are rejected. Of the remaining monitored shells, at least ten percent of the batch with the highest coercive force values is selected. From the sample, the shell with the maximum value of the coercive force is disassembled. From the case of this shell, samples for mechanical testing are cut from the anchoring zone of the leading belt. Tests are carried out according to standard procedures. Based on these tests, the mechanical properties of the case metal are evaluated. If these properties are consistent with the level specified in the drawing, a decision is made to extend the life of the batch of products. If these properties deviate from the level specified in the drawing, at least two shells with a coercive force level of at least 10 % less than the one already tested are selected. Mechanical properties of the metal of these two cases are evaluated by the same method. If the mechanical properties of the metal of these shells correspond to a given level, a decision is made to extend the life of the batch of products. Shells, in which the coercive force is greater than the coercive force on the last tested shell with positive properties, is withdrawn from the batch. If negative test results are received, service life of the batch of these shells is not extended.

EFFECT: increase in the economical efficiency and technological effectiveness of the method of estimating the life of steel cases of artillery shells.

1 cl, 2 dwg