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The Shot Peener magazine, Winter 2012 issue

The Winter 2012  issue of The Shot Peener magazine is published and available for download and on-line reading. Top stories in this issue are:

Unbearable Lightness?
To meet 2016 CAFE requirements, car manufacturers must re-think weight and materials. What will this mean for shot peening?

Opinion Page
Precision peening or spray and pray?

Component Shape Changes Caused By Shot Peening
Analysis of shape changes induced by peening is complicated as it involves simultaneous use of both plasticity and elasticity theories. A simplified approach is used in this article by invoking the two theories separately.

James Kernan 2011 Shot Peener of the Year

“James was awarded the 2011 Shot Peener of the Year from The Shot Peener magazine due to his extensive efforts to revise SAE shot peening documents and his dedication to improving shot peening practices at Corpus Christi Army Depot and the U.S. Army Aviation and Missile Research, Development and Engineering Center. We especially admire the tenacity and thoroughness James demonstrates while working on the “J” and AMS documents.”

—Jack Champaigne
Editor, The Shot Peener magazine

JAMES KERNAN is an Aerospace Engineer employed by the U.S. Army Aviation and Missile Research, Development and Engineering Center based in Huntsville, Alabama. James is responsible for the maintenance engineering of helicopter drive systems, including the transmission, gearboxes and rotor head, and the repair and overhaul of  drive system components.  James utlizes the full spectrum of repair development including failure analysis, root cause evaluation, and design redevelopment.

James has a B.S. degree in Metallurgical and Materials Engineering from the University of Texas at El Paso and has achieved Electronics Inc. Education Division’s Shot Peening Level III certification status. He is a member of ASM International and the Minerals, Metals and Materials Society. James was instrumental in leading the Corpus Christi Army Depot to Nadcap accreditation in 2007.

James realized from this in-depth audit that the shot peening specifications needed adjustments. He became a member of both the SAE Surface Enhancement Committee and the AMS Aerospace Metals and Engineering Committee (AMEC) Surface Enhancement Subcommittee. He co-authored the AMS 2590, Rotary Flap Peening of Metal Parts and AMS 2592 Flap Assemblies, Rotary Flap Peening. These specifications are utilized for minor repairs of previously shot-peened surfaces. “I enjoy using shot peening to repair components. Through my involvment with SAE, AMEC and my field experience, I can help refine specifications that will further improve the repair processes,” said James.

James is the sponsor of AMS 2430S, Shot Peening, Automatic and is responsible for coordinating its revisions. “I appreciate being part of the specification revision team and bringing together the committee members’ concerns to evolve a workable, auditable requirement into the specification. I hope to see the AMS 2430 get AMS B Committee approval soon with the AMS 2432, Shot Peening, Computer Monitored revision following thereafter,” said James.

Electronics Inc. Announces 2012 Workshop Schedule

The Electronics Inc. Education Division has announced a full schedule for 2012 with workshops scheduled around the world.

The EI workshops include two to three days of intensive instruction on all aspects of the shot peening and blast cleaning industry.  Optional Workshop Certification Exams for registered students are offered at most of the workshops.  Product design engineers, machine operators, foremen, supervisors, maintenance and quality engineers all benefit from attending a workshop.

The Shot Peener Magazine, Fall 2011 issue published

The Fall  2011 issue of The Shot Peener magazine is published and available for download and on-line reading.

Top stories in this issue are:
What’s Up With Shot Peening?
An expert in aerospace composites and metals gives his viewpoint on the future of shot peening. A hint: The Boeing 737 plays a role.

Forewarned is Forearmed
The use of steel components in landing gear is being challenged by new materials.

Keeping Pace
Shot peening research from the recent international shot peening conference tracks with trends in new aerospace materials.

Help for New Shot Peening Technicians
In an effort to help new shot peening technicians, we’ve supplied definitions for key terms in the intensity control process.

China: An Emerging Peening Market
Adam Chai, coordinator for shot peening workshops in China, shares his perspective on the status of training in his country.

Continuous Measurement Versus Intermittent Indication of Peening Intensity Curves
Dr. David Kirk explains and compares two approaches to obtaining peening intensity curves.

Shot Peening Reduces Bacteria Function on Titanium

Dr. Thomas Webster, Associate Professor of Engineering with Brown University, presented his research paper titled “Decreased Bacteria Functions on Shot Peened Titanium” at the Eleventh International Conference on Shot Peening this September.

The study’s objective was to use shot peening to modify the surface of implanted titanium and implement nanoscale surface features that reduce bacterial function without the aid of pharmaceutical agents. The testing was conducted on S. aureas , P. aeruginosa and S. epidermis—commonly found bacterias in prosthetic infections. “Results demonstrated significantly lower functions of all bacteria of interest to the present study on shot-peened titanium. In this manner, aside from the well-documented mechanical properties of shot peening, this study provided evidence that infection can be reduced on shot-peened titanium and thus should be further explored for orthopedic applications,” cited the paper’s authors.

The experimental methods compared the bacteria cultured on three sets of five Titanium 6Al-4V samples. The titanium samples were differentiated by five types of peening media and were peened with conventional shot peening processes. The bacteria was seeded onto the titanium samples and cultured for up to seven days. The study was conducted without antibiotics. Results of the in-vitro study demonstrated significantly less of each bacteria type on shot-peened titanium compared to titanium controls; in particular, titanium peened with micro-bead media. The researchers speculate that due to the unique nanometer surface features created by shot peening, the new surface energy altered initial protein interactions and inhibited bacterial attachment.

The study was funded by Electronics Inc.   Electronics Inc. manufactures products that improve the quality and control of the shot peening process including the MagnaValve media valve, controllers, Almen gages and Almen test strips. (http://www.electronics-inc.com)

Shot peening is a cold-working process in which a metal surface is peened to induce compressive stresses and thereby improve fatigue life. Shot peening is used in aerospace, automotive, energy, medical and other industries that need to improve the fatigue properties of metal components. (“What is Shot Peening” video )