Procedures for Using Standard Shot Peening Almen Strip
- Ground Vehicle Standard
Figure 1 - Eliminate “or less” from the arc height increase criteria so one and only one numeric answer can be derived from a given saturation curve. Use of “or less” may allow extremely long exposure times with corresponding increases in arc heights to erroneously qualify as intensity.
Figure 2 - Demonstrates that special cases exist where some peening techniques are accomplished with incremental number of passes through a machine, rotations of a turntable, strokes of a reciprocating nozzle or other methods and due to configuration and machine control constraints the Almen strip is saturated at the first exposure (least amount of exposure available) to the shot stream and additional passes do not significantly increase the arc height further.
Section 7.3 - It is common to use a fixture with multiple Almen holders for intensity tests. The peening intensity at each holder position must meet the requested values. The “saturation times” for each holder will be unique. When performing intensity verifications (one strip at saturation time) each holder must be exposed individually to its own saturation time and its arc height must be within the requested tolerance band. An alternative method is allowed by establishing “target arc heights” for use in intensity verification whereby the fixture can be used with all holders simultaneously and the obtained arc heights (within tolerance band) at each location must repeat the arc heights obtained in their respective saturation curve.
Data Sets - Support Documents
|Unnamed Dataset 1|
The Surface Enhancement Committee is primarily engaged in standard practices for shot peening and similar metal treatments to abate fatigue failure. The committee webpage is meant to be a repository for Surface Enhancement Committee on-going work and news. It is meant mainly for active committee members quick reference, but all others are also welcome to look and comment (you are welcome to attend meetings also). The materials presented here are NOT SAE official documents, and are only meant as working documents, with the usual working document errors. The material should not be used for any other purposes except Surface Enhancement Committee work. Participants in the SAE Surface Enhancement Committee include OEMs, suppliers, consulting firms, government and other interested parties.