SAE J442:2001 pdf download

SAE J442:2001 pdf download Test Strip, Holder, and Gage for Shot Peening
1. Scope—This SAE Standard defines requirements for equipment/supplies to be used in measuring shot peening intensity.Guidelines for the use of these articles (test strip, holding fixture, and gage) are also included.
2.References
2.1 Related Publications—The following publications are provided for information purposes only and are not a required part of this specification. The latest issue of SAE publications shall apply.
2.1.1 SAE PUBLICATION—Available from SAE,400 Commonwealth Drive, Warrendale, PA 15096-0001.
SAEJ443—Procedures for Using Standard Shot Peening Test Strip
SAE AMS-S-13165——Shot Peening of Metal Parts
2.1.2 ASTM PUBLICATION—Available from ASTM,100 Barr Harbor Drive, West Conshohocken,PA 19428-2959.
ASTME18—Standard Test Method for Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials
3. Outline of Method of Control—The control of a peening machine operation is primarily a matter of the control of the properties of a stream of shot in relation to the work being peened. The basis of measurement ofthese properties is as follows:
lf a flat piece of steel (the test strip) is clamped to a solid block (the test strip holder) and then exposed to astream of shot, it will be curved upon removal from the block. The curvature is due to residual compressivestresses induced by the shot impacts,causing the peened face to be convex. The curvature serves as ameans of measuring the effect of the shot stream. The degree of the curvature depends upon the propertiesof the shot stream, the properties and mounting of the test strip, and the exposure condition.
3.1 Properties
3.1.1 SHOT STREAM—The properties of the shot stream are: shot material (includes chemical and physical characteristics), size, shape, velocity, directional consistency, and shot flow rate.
3.1.2 TEST STRIP一The properties of the test strip are: material (includes chemical and physical properties),hardness, physical dimensions,and the extent of any internal stresses. The properties of the test stripmounting are flatness, rigidity,and the location and force of the holding means.
3.1 .3 E XPOSURE —The properties of exposure to the blast stream are length of time, angle of impact, and the degree of uniformity and consistency of the geometric relationship between the shot stream and test strip.
3.2 Standards—Based on these principles, the SAE has adopted the following standards: test strips, holding block, and gage. Specifications for these parts, the method of use, and a standard designation are presented herein.
4. Specifications of Intensity Measuring Equipment
4.1 Test Strips and Holding Fixture—Standard test strips, N, A, and C are shown in Figure 1 and test strip holder is shown in Figure 2. The approximate relationships between readings of test strips N, A, and C (for conditions of identical blast and exposure) are as follows: