This SAE Recommended Practice provides uniform procedures for using the standard shot peening Almen strips reported in SAE J442. Standard Almen strips are used to establish saturation, determine intensity, monitor repeatability of the shot peening machine operations, and can be used to predict a desired result on a part. It is recommended that the standard Almen strip A be used for intensities that produce arc heights of 0.10 mm A (0.004 in A) to 0.60 mm A (0.024 in A). For intensities below 0.10 mm A (0.004 in A), the standard N strip is recommended, and for intensities above 0.60 mm A (0.024 in A), the standard C strip is recommended. Use of SAE 2597 Computer Generated Shot Peening Saturation Curves is voluntary, existing shot peening processes that do not take advantage of computer generated saturation curves need not be changed to meet the requirements listed herein.
The process of shot peening, in common with many other processes, cannot at present be adequately controlled by nondestructive inspection of the peened parts, therefore, it is necessary to control the process itself to achieve consistent, reliable results.
Rationale
Substantial revisions have been made to this document and the (R) symbol to the left of the document title indicates a complete revision.
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.
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.
* Redlines comparisons are available for those standards
listed in the Revision History that contain a radio button. A
redline comparison of the current version against a revision is
accomplished by selecting the radio button next to the standard and
then selecting 'compare'. At this time, Redline versions only exist
for some AMS standards. SAE will continue to add redline versioning
with ongoing updates to SAE MOBILUS.
View/Annotate
Content Loading, Please Wait
Document Preview
Content Loading, Please Wait
Document Comparison
Content Loading, Please Wait
Download
A list of downloadable items.
Product Code
Document Title
File Type
Download
J443_201006
Procedures for Using Standard Shot Peening Almen Strip
Export Metadata
This modal will allow the user to download citation information or export specific fields of data into one of three file formats: Excel, comma-separated values, or text.
You are currently not logged into your Dashboard account, which is required for annotating.
Please select Login to login or register for the Dashboard. Select Continue to view the content without the ability to annotate.
Redline Warning
You are currently not logged into your Dashboard account, which is required for annotating.
Please select Login to login or register for the Dashboard. Select Continue to view the content without the ability to annotate.
Data Set Warning
Procedures for Using Standard Shot Peening Almen Strip
SAE Journal Subscriptions are available in a variety of options, which include electronic, electronic with back file, and archive. For detailed information and options, please complete the following:
Content Request
Check My Access!
You may already have access to the Ground Vehicle Standard, Procedures for Using Standard Shot Peening Almen Strip
Subscription Access
If you have Subscription Access with a username and password, please login below.
Institutional Login
If you have Institutional Access to SAE MOBILUS, using a predetermined organizational login utilizing single-sign-on (Shibboleth), please login below. To request institutional access to SAE MOBILUS, please complete the institutional subscription information form.
Purchase
If you do not have access to SAE MOBILUS via username/password or institutional access, you can still purchase the Ground Vehicle Standard, Procedures for Using Standard Shot Peening Almen Strip.
Search Tips: Search Operators:AND, OR, NOT; Wild Cards; Using Quotes
SAE MOBILUS® Search Tips
Please note: All terms not contained within quotes, will be evaluated using the OR operator. This means that your search results will contain all results that contain ANY of the entered terms.
AND, OR, NOT
SAE MOBILUS supports the use of the AND, OR and NOT BOOLEAN operators ONLY function with the Advanced Search.
Wild Cards
Using the asterisk, ( * ) allows you to search for a partial word. For example, entering a keyword search of aero* will search for any word beginning with aero.
Using the question mark, ( ? ) allows you to search for a word with a single character wildcard. For example, searching for t?re would match both tire and tyre
Using Quotes
Words in double quotes " " are treated as a phrase. Conducting a search for "heat model" will return all results in which the exact phrase "heat model" is found, while "heat modeling" would NOT be included.
A term combined with a phrase will be joined with an OR operator.
Searching for Standards
When searching for a standard please use the entire Document Number assigned, which includes the abbreviation. A space can be used, or omitted between the abbreviation and number.