GNR

RESIDUAL STRESS X-RAY DIFFRACTOMETER

Partner of GNR Analytical Instruments Group

GNR, founded in 1984, is an italian producer of X-Ray Diffractometers (XRD) and X-Ray Fluorescence Spectrometers (XRF) for the study of material structure and elemental composition for both scientific and industrial applications.

GNR Head Office and Production Site is located in Agrate Conturbia (Novara), near Lago Maggiore; 20 minutes from MALPENSE Airport.

Stress X- Robotic Residual Stress X-Ray Diffractometer

StressX provides a flexible solution to residual stress determination on samples of any dimensions by the synergy between compact X-Ray diffractometer and 6-axis anthropomorphic robot.

SpiderX - Edge – Portable Residual Stress & Retained Austenite Measurement

SpiderX – Edge is a portable Theta/Theta X-ray diffractometer: it allows performing reliable measurements on production samples and specimens to determine residual stress, retained austenite and to investigate alloys structure and phase composition.

Residual Stress X-Ray Diffractometer

Residual stress could be induced by machining, grinding, rolling, deep drawing, welding, thermal hardening and shot peening; its quantification allows to prevent fatigue damage and to control material’s durability and safety.

X-Ray Diffraction is the conventional and time proven technique for measuring residual stress. Using the interatomic spacing as the ultimate gage length, the X-Ray technique is ideal for and applicable to crystalline materials, especially for metals, but also for ceramics. It measures the absolute stress without the need of an unstressed calibration sample.

Effects of Residual Stress

Residual stress is the stress resident inside a component after all external applied forces have been removed:

Compressive Residual Stress (σ < 0)

Reduce crack propagation
Prolongs fatigue life and durability
Increases strength and corrosion resistance
Decreases total stress in the areas where high loads are applied

Tensile Residual Stress (σ > 0)

Increases crack propagation
Reduces the mechanical performance of materials

Residual Stress quantification allows to prevent fatigue damage and to control material’s durability and safety.

Application: Leaf Spring

This measuring StressX station is equipped with two etching stations and StressX is located to the center in order to operate on both leaf spring sides, allowing sequential etching and measurement steps without removing the sample.

Application: Clutch Manufacturing

Residual Stress measurement on the diaphragm spring after undergoing casting, induction hardening and shot peening process sequentially.

Application: Welding

Suspensions: Increasing of the tensile residual stress to the center of the weld

Frequently Asked Questions

What are the limitations of the shape and size of the sample for residual stress measurement?

GNR StressX provides a flexible solution to residual stress determination on samples of any dimensions by the synergy between compact X-Ray diffractometer and 6-axis anthropomorphic robot. The goniometer mounted on an 6-axis anthropomorphic robot provides the possibility to analyze samples of any dimensions and shapes.

Can the residual stress at the depth of the component be measured?

The small penetration depth of X-Ray allow also to draw depth profiling curves by measuring the stress state at different depth after electrochemical polishing of the component surface.

What kind of materials can be measured?

All materials with a sufficient degree of crystallinity can be analyzed; XRD measurement reliability depends on degree of crystallinity, surface roughness, non-flat surfaces, highly textured material, coarse-grained material, broad diffraction lines.

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