Test methods and procedures

Page Title: Test methods and procedures
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MIL-P-45172F(MU)

4.4 Test methods and procedures.

4.4.1 Hardness. -The method of test shall be in accordance with ASTM E18-67,

Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials.

4.4.1.1 Body. -Each sample body shall be sectioned , prepared and one hardness

impression taken within each of the areas as shown on Dwg. D7258807, a detail

of D7258804.

4.4.1.2 Adapter. -One hardness impression shall be taken per test assembly

in the area prescribed on Dwg. D7258804. No cylindrical correction shall

be applied.

4.4.1.3 Nose. -Three hardness impressions shall be taken, approximately 120

apart, on the cylindrical diameter of each nose of the sample. The average

of the three readings shall apply as the nose hardness. Test sample noses

shall be supported on a mandrel approximately 0.5 inch in diameter. No

cylindrical correction shall be applied.

4.4.2 Adapter security. -The test for adapter security shall be conducted

using a standard tension testing machine of sufficient capacity. Rate of

pull shall be l inches 1/4 inch per minute.

4.4.3 Band tightness. - The method of test shall be in accordance with all

requirements of the operating instructions for the band tightness tester

(Dwg. B7259545, a detail of IEL 7258805). The inspection sample shall be

cycled through the tester to determine compliance with the rotating band

tightness requirement. The total measurement of radial void, registered

on the tester indicator at final ram pressure, shall be divided by four

(number of indenters) to determine the average radial void.

4.4.4 Soundness. -The method of inspection shall be in accordance with all

requirements of Operating Instructions Manual, Eddy Current Flaw Detector,

Dwg. D110752O3 (a detail of IEL 7258805) for Detecting Metal Discontinuity

in Projectile Bodies for 20mm Ammunition, except for those inspection re-

quirements which are reserved for Government application, as specified

herein.

4.4.4.1 Application of defect standards. -Master defect standards, refer-

enced in the Operating Instruction Manual, shall apply to resolve inspection

discrepancies occurring between the results of defect standards supplied for

contractor "soundness" inspection and those supplied for Government "sound-

ness" verification. (see 6.6)

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