Tag: fatigue analysis
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Legacy Post: USAF Damage Tolerance Design Philosophy
In the early days of aviation, the concept of fatigue life was not a prime consideration in design. Aircraft did not typically have a long service life and were designed based on ultimate strength. Early aircraft failures occurred due to component/system failures, combat damage, and pilot error. Aircraft did not typically last long enough for…
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Hill Engineering Looks Ahead to Residual Stress Technology Conference 2026 in Quebec City
Hill Engineering is looking forward to the Residual Stress Technology Conference 2026, taking place September 28 through October 1 in Quebec City, Canada. This dynamic event brings together engineers, researchers, and industry leaders to explore the latest advances in residual stress science and their impact on material performance. RSTC 2026 marks an important evolution in…
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Legacy Post: How Tensile Testing Works: A Brief Introduction to Material Strength Testing (Aug 2017)
A tensile test is a standard method used by material scientists and engineers to determine important material strength and ductility properties. For example, tensile tests can be used to measure the yield strength of a material, which is defined as the stress at which a material begins to deform plastically. Hill Engineering has ample experience…
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Legacy Post: Lincoln Award (July 2017)
The Lincoln Award is named in honor of Dr. John W. (Jack) Lincoln, the U.S. Air Force’s first Technical Advisor for Aircraft Structural Integrity. An internationally recognized expert in structural integrity, fatigue analysis, and aviation safety, Dr. Lincoln is credited with developing the Aircraft Structural Integrity Program (ASIP) that is now institutionalized throughout the Air…
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Legacy Post: Hill Engineering opens Utah Office (Jun 2017)
Hill Engineering, LLC, answering strong demand for its aircraft structural integrity, fatigue analysis and design, and residual stress engineering services, has opened a satellite office in Layton, UT. This new office will allow Hill Engineering to better connect and collaborate with our customers and partners in the local area and the broader aerospace community. Our…
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Legacy Post: 2016 Highlights at Hill Engineering (Jan 2017)
2016 was an exciting year at Hill Engineering. We accomplished so much and we wanted to take a moment to recognize some of the highlights. Early in the year, we were in the middle of Hill Engineering’s largest ever facilities planning/construction project. We had just selected our new office location and needed to plan and…
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Legacy Post: Hill Engineering’s Internship Program (Aug 2016)
Every summer, Hill Engineering hires university students as interns; aiming to give them insight into industry jobs and provide them with the experience they’ll need to develop their careers post-graduation. We pride ourselves on involving interns in projects which utilize and further explore the concepts they have learned in school. In the past, we’ve had…
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Legacy Post: Understanding Fatigue Analysis for Structural Durability (Apr 2017)
Fatigue is a material failure mechanism whereby repeated sub-critical loads nucleate and grow cracks that can ultimately lead to failure of a structure. Hill Engineering routinely performs fatigue analysis to quantify and predict fatigue performance of materials. State-of-the-art fatigue analysis is subdivided into categories, including durability (crack initiation) or damage tolerance (crack growth). The appropriate…
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Legacy Post: Fracture surfaces evaluation
Aircraft undergo complex loading during their operation and lifecycle. For example, take off, landing, turbulence, and flight/ground maneuvers are all instances where significant loading occurs. The cyclic loading and unloading activates a failure mechanism called fatigue, which is most prevalent at the highest stressed regions. Many aircraft are assembled using riveted construction, whereby small holes…
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Legacy Post: Residual stress analysis (Oct 2016)
Material fabrication processes like forging, rolling, extrusion, quenching, additive manufacturing, machining, and welding lock spatially varying residual stress fields into structural materials. These residual stresses can influence the way that materials perform (e.g., fatigue, fracture, distortion, and corrosion). Hill Engineering has developed expertise to support many different types of residual stress analysis, which we apply…