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Residual stress measurement

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Residual stress measurements for shot peened surface characterisation

RESIDUAL STRESS MEASUREMENT METHODS: X-RAY DIFFRACTION, DRILLING AND OTHER DESTRUCTIVE OR NON-DESTRUCTIVE MEASURES

SONATS applies the following methods to measure residual stresses :

  • X-ray diffraction according to EN 15305, non-destructive surface measurement or semi-destructive depth measurement, transportable equipment
  • Incremental hole-drilling strain-gauge method according to ASTM E837, semi-destructive measurement, transportable equipment
  • Destructive methods of mechanical relaxation: arc-length method, slicing/cutting method, etc.
  • Access to large instruments for specific applications requiring non-destructive depth measurements (X-ray synchrotron, neutrons)
42 - ENG - Shot peened surface characterization

Download our dedicated brochure on shot peening surface characterization & residual stress measurement.

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QUALITY ASSURANCE AND PROCESS OPTIMISATION

SONATS provides comprehensive expert examination of residual stress and analysis of metallic materials.

Residual stresses cause harmful deformation of parts during manufacture (distortion). They also have an effect on crack resistance: fatigue, stress corrosion, toughness. In addition to metallurgical and dimensional aspects, knowledge and control of residual stresses is therefore important to optimise processes and product quality.

Laboratory’s strengths

25 years of experience in many industrial sectors in France and abroad, with more than 100,000 measurements made.

High-level knowledge and skills teams.

Rigour and quality of measurements and reports.

Explanations and advice for understanding and evaluating the results.

APPLICATIONS OF RESDIUAL STRESS MEASUREMENTS AND ANALYSES

SONATS methods are applicable to all types of parts and materials, regardless of the distribution of residual stresses considered:

Aeronautical - Compressor wheel - SONATS
Aeronautics - Transmission shaft - SONATS
Aeronautics - Bearing cage - SONATS
Mesure-de-contraintes-résiduelles-par-diffraction-des-rayons-X---SONATS

 Evaluation of compression after shot peening steel, aluminium, titanium and Inconel

Applicable also for: rolling, peening, burnishing, carburising, nitriding, coating, thermal spray, etc.

 Integrity of machined surfaces, surface stresses due to machining

Relationship between residual deformation and stresses (distortion)

Residual stresses in additive manufacturing

Shot peening surface characterization & residual stress measurement brochure

Welding residual stresses and effects of post-treatment

The effects of stress relieving or stabilisation heat treatment

Examples of studies

Discover a list of examples of analysis and measurement studies for material qualification, part inspection and analysis of the effects of forming processes:

■ Control of compression depth after shot peening
■ Fatigue sample machining test
■ Prediction of deformation after machining
■ Qualification of a new machining centre for aerospace parts
■ Study of distortions due to heat treatment, controls upon receipt of material
■ Study of the influence of the filler metal on MIG-MAG welding residual stresses
■ Residual stresses after friction stir welding, effect of intensity on the residual stresses in laser welding
■ Effect of TIG dressing and straightening post treatment at the weld bead toe
■ Effect of stress relief treatment
■ Study of the sterilisation temperature
■ Residual stresses on HVOF deposit
■ Residual stresses on silicon wafers
■ Effect of the substrate on the residual stresses of the deposit, etc.

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    • Ring Core Method
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