Hill Engineering Blog

ASIP conference 2018

Hill Engineering is presenting at the upcoming 2018 United States Air Force Structural Integrity Program Conference (ASIP) in Phoenix, AZ. Our talk will focus on residual stress evaluation in legacy aircraft cold expanded fastener holes. The 2018 ASIP Conference is specifically designed to bring together the world leaders in the area of aircraft structural integrity, to disseminate information on state-of-the-art technologies for aircraft structures in both the military and civilian fleets. Hill Engineering’s presentation will include a summary of recent work in airframe structures, demonstrating the effect of aircraft service on the residual stress at cold expanded fastener holes. The abstract text is presented below. Continue reading ASIP conference 2018

Hill Engineering meets Big Trees

Nothing beats the great outdoors, if you ask me. Well, maybe residual stress measurements, but that’s a different story. This summer, the Hill Engineering group drove down to Calaveras Big Trees State Park to take in the sights and sounds of nature, complete with campfire songs, S’mores, and a weekend filled with fun. Continue reading Hill Engineering meets Big Trees

Residual stress measurement techniques

Residual stresses exist in most materials and structures. Processes like forging, rolling, extruding, quenching, additive manufacturing, machining, and welding can cause residual stresses to develop. These stresses can influence the way that materials perform (e.g., fatigue, fracture, distortion, and corrosion). There are many different residual stress measurement techniques available to quantify residual stresses. The following are some examples of common measurement techniques. Continue reading Residual stress measurement techniques

Engineered Residual Stress Implementation workshop 2018

Hill Engineering is proud to support the USAF and their objective to advance damage tolerance analysis methods through the Engineered Residual Stress Implementation (ERSI) workshop. At this year’s ERSI meeting, Hill Engineering will meet with other stakeholders in the USAF aircraft community to review progress over the past year towards implementation of engineered residual stress in the USAF fleet. Continue reading Engineered Residual Stress Implementation workshop 2018

BAMF User Workshop 2018

This year’s AFGROW User Workshop will be hosted at the Weber State University Center in Clearfield, UT on September 11-12, 2018. The first annual BAMF workshop will take place at the end of the workshop in the afternoon on September 12th. The BAMF workshop will include presentations on the current work being accomplished by BAMF, recent updates, and a discussion about future plans. If you would like to participate in either the AFGROW or BAMF workshop please register for the meeting at the link above. Continue reading BAMF User Workshop 2018

The first contour method measurement specimen

Hill Engineering’s new facility in Rancho Cordova, CA features a combination of laboratory, research and development, and office space. Our primary conference room is named in honor of Mike Prime, the inventor of the contour method. The Prime Room stands as a tribute to the creativity, insights, and support that Mike Prime has provided to Hill Engineering over the years. One of our favorite pieces on display in the Prime Room is one half of the specimen that was used for the first successful contour method measurement. Continue reading The first contour method measurement specimen

Hole drilling residual stress measurement method

This week, we have uploaded a new vlog to Hill Engineering’s YouTube channel revolving around a particularly handy residual stress measurement technique. The hole drilling measurement method is one of our most popular residual stress measurement options, and involves the incremental drilling of a small hole into the surface of a specimen. Watch the video below and read on to learn more about the hole drilling method. Continue reading Hole drilling residual stress measurement method