Electronics Incorporated - The Shot Peener - Shot Peening Library
Title: Almen Strip Consistency Testing
Author: TSP Staff
Source: TSP, Vol 23 / Issue 1, Winter 2009
Publication year 2009
Document number: 2009003
Number of pages: 2
Abstract:
Study Results Almen Strip Consistency Testing
SUMMARY Shot peening intensity is the measure of the energy of the shot stream and intensity control is one of the essential means of meeting peening specifications.
Intensity is measured using Almen strips. When an Almen strip is shot peened, the residual compressive stress causes the Almen strip to bend or arc toward the peened
side. The Almen strip arc height is a function of the energy of the shot stream and is very repeatable. Therefore, for Almen strips to provide reliable and repeatable
intensity verification, it is critical that they are consistent in thickness, flatness and hardness. Electronics Inc. (EI) brand of Almen strips have undergone
extensive testing to ensure consistency from lot to lot. Before bringing their Almen strips to market, EI developed a custom air blast test cabinet and shot peened
approximately 4,000 strips manufactured over a three-year period. The data was put into histograms for accurate analysis. The histograms show nearly identical
lot-to-lot arc height results. For example, the means range from 11.99 to 12.14 (0.001-inch units) and standard deviations range from 0.096 to 0.185. (Histogram
samples are available on page 16.) EI’s testing capabilities and test results validate EI’s ability to produce reliable Almen strips.
INTRODUCTION
Electronics Inc., a manufacturer of products that control and improve shot peening processes, has been a worldwide supplier of Almen strips
for over 21 years. In 2008, EI launched their own brand of A and N Almen strips to meet increasing demand for their strips in the aerospace industry and to better
control the quality of the product. During research and development, EI began consistency testing to quantify the strips’ performance and to develop documented
confirmation that the strips were manufactured under conditions more stringent than SAE J442 specifications.
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This page last revised: 07/25/2009