New Study on the Reproducibility of Deep-Hole Drilling Residual Stress Measurements

Hill Engineering and VEQTER are excited to announce a new collaborative publication on the reproducibility of the Deep-Hole Drilling (DHD) residual stress measurement method. This study examines the consistency and reliability of Deep-Hole Drilling, providing valuable insights into its application in engineering stress analysis.

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Case Study: Exploring the Repeatability of Contour Method Residual Stress Measurements

Hill Engineering has published a comprehensive case study evaluating the repeatability of contour method residual stress measurements across a variety of materials, processes, and geometries. This study provides valuable insights into the precision of the contour method, reinforcing its reliability for residual stress analysis.

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Hill Engineering Reinforces Commitment to Excellence with ISO Accreditation Renewal

Delivering high quality residual stress measurement results to our customers is a top priority for Hill Engineering, and one way we ensure that is by maintaining an active ISO/IEC 17025 accreditation. We recently went through an external assessment to renew our accreditation status that looked at the inner workings of our quality management system and laboratory processes.

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Near Edge Residual Stress Measurement Using Incremental Hole Drilling

Background

Hole drilling is a measurement technique used to determine near surface residual stresses and has been codified in ASTM E837-20. In ASTM E837-20, the minimum allowable distance to a free edge is prescribed as 1.5 times the gauge circle diameter.

Objective

This work examines the effect arising from the distance from a free edge on a hole drilling measurement and provides an approach to determine residual stress for measurements where the edge distance is closer than that currently permitted by ASTM E837-20.

Methods

Numerical experiments were performed to understand how the compliance matrices change when the distance from a hole drilling measurement to a free edge varies. In addition, a series of hole drilling measurements were performed
at various distances from a free edge using a shot peened aluminum plate with a nominally equibiaxial stress state to demonstrate the approach.

Results

The numerical experiments determined that the use of corrected compliance matrices is appropriate when the edge distance is as small as 0.35 times the gauge circle diameter. Physical measurements supported the use of custom compliance matrices for a given free edge distance and specimen thicknesses.

Introducing Hill Engineering’s New Brochure on Deep-Hole Drilling Residual Stress Measurement

Our latest brochure highlights the Deep-Hole Drilling (DHD) residual stress measurement method, a specialized technique with applications across multiple industries, including aerospace, automotive, and heavy manufacturing.

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Download Hill Engineering’s X-Ray Diffraction Residual Stress Measurement Brochure

We are excited to introduce our new downloadable brochure, providing comprehensive details on the x-ray diffraction (XRD) residual stress measurement method. Available on the X-ray Diffraction Method page, this essential technique is ideal for accurately determining near-surface residual stresses, offering precise results that are crucial for industries ranging from aerospace to manufacturing.

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A closer look at Hill Engineering’s internal audit program

In an early blog post, we discussed Hill Engineering’s efforts to build and maintain a Quality System that is compliant with ISO 17025. More recently, we touched on our quality control program, which we use as an important check to make sure that our measurements are being carried out according to established procedures and meeting certain quality requirements. Now we’re back to give another glimpse into our Quality System and talk about another important aspect, our internal audit program.
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Hill Engineering is attending IMTS 2024

Members of Hill Engineering will be attending IMTS 2024 in Chicago, IL, from September 9th through September 14th. The International Manufacturing Technology Show is a great opportunity for people in industry to connect and gain insight into the various technologies in advanced and traditional manufacturing, robotics, automation, and digital transformation, sparking inspiration and possibly finding solutions to engineering problems they are looking to solve.

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Hill Engineering acquires a new XRD system

Hill Engineering has recently acquired a new diffractometer and enclosure that will enable us to perform x-ray diffraction (XRD) residual stress measurements in our Rancho Cordova, California, laboratory.
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New case study: Residual Stress Field Team

We invite you to read our latest case study which highlights the capabilities of our Residual Stress Field Team, who can perform many of our world-class residual stress measurements on-site at a customer’s facility. Continue reading New case study: Residual Stress Field Team