Stress measurement: think NDT!

Walaszek, Henri; Centre Technique des Industries Mecaniques; France

Bouteille, P.; CETIM; France
Lefebvre, F.; CETIM; France
Walaszek, H.; CETIM; France
Wasniewski, E.; CETIM; France
Zhang, F.; CETIM; France

ID: ECNDT-0329-2018
Session: Materials Characterization UT
Room: G1
Date: 2018-06-13
Time: 16:40 - 17:00

Knowledge of the stresses in the materials is an important factor in understanding the mechanical state of the components and to guarantee their stability over time. Such knowledge may be used to predict the deformations at machining, the dimensional stability over time, and the fatigue strength.

This presentation explicates the interest and limitations of stress measurement methods such as X-ray diffraction and incremental drilling (often referred to as the reference surface stress measurement method), ultrasound and ferromagnetic noise (which represent two experimental methods).

The applications of stress measurement concern different types of components, for the measurement of surface and volume stresses. Mention may in particular be made of the control of thermal quenching or relaxation treatments, mechanical treatment and the ultrasonic measurement of preload stress in bolted assemblies. Recent developments of these methods now allow on-site measurements, in particular X-ray diffraction and electromagnetic methods. In completion of these technical advances, standardization work is underway to integrate technical evolutions, in particular for ultrasonic measurement.
The presentation will develop the methods, the applications, as well as the evolution of the context of standardization.