scholarly journals On the Distinction between Instrumented Indentation Technique and X-ray Diffraction Method in Nondestructive or Semi-Nondestructive Surface Stress Measurement

2016 ◽  
Vol 65 (4) ◽  
pp. 319-324
Author(s):  
Shigetaka OKANO ◽  
Daisuke KANAMARU ◽  
Ryohei IHARA ◽  
Masahito MOCHIZUKI
Keyword(s):  
Surface Stress ◽  
Stress Measurement ◽  
Diffraction Method ◽  
Instrumented Indentation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Indentation Technique

Research on Stress Calibration Technology on Aluminum of High-Speed Train Body Structure by Nondestructive X-Ray Method Measurement

2011 ◽  
Vol 189-193 ◽  
pp. 734-742
Author(s):  
Hua Ji ◽  
Hui Chen ◽  
Guo Qing Gou ◽  
Da Li ◽  
Yan Liu ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
High Speed ◽  
Stress Measurement ◽  
Diffraction Method ◽  
Welding Residual Stress ◽  
X Ray Diffraction ◽  
Ray Method ◽  
Electrometric Method ◽  
X Ray ◽  
6082 Aluminum Alloy

X-ray diffraction method has been employed to calibrate the stress of 6082 aluminum alloy which has been widely used among modern industrial products. Based on elastic tensile conditions, by designing rod sample of uniform intensity calibration (RSUIC), the stress measurement by X-ray diffraction method has been verificated by using elastic tensile theory calculation method and electrometric method. The results show that the stress measured by the tensile stress theoretical calculation, electrometric method and X-ray diffraction method was in good accordance with each other. And the matching relation between the surface stress measured by X-ray diffraction and the internal stress is investigated. The research will lay a foundation for the application of iXRD stress instrument for nondestructive measuring the welding residual stress of aluminum alloy.

scholarly journals Residual Stress Measurement Methods Comparison in High-Strength Steel for Naval Application

2014 ◽  
Vol 996 ◽  
pp. 343-348
Author(s):  
Bruno Levieil ◽  
Sylvain Calloch ◽  
Cédric Doudard ◽  
David Thévenet ◽  
Bruno Leblé
Keyword(s):  
High Strength Steel ◽  
Stress Measurement ◽  
Low Cycle Fatigue ◽  
Diffraction Method ◽  
High Strength ◽  
Contour Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Plate Specimen ◽  
Good Agreement

Residual stresses can be beneficial or detrimental to mechanical structures. In this work, a rectangular plate specimen with a cold expanded hole was designed to study the influence of these stresses on low cycle fatigue of high-strength steel. Three separated measurements of the stresses were made using different techniques: indentation method, X-ray diffraction method and contour method. The results show good agreement with finite element modelling of the cold-expanded hole problem.

Technology development for in-situ measurement of residual stress in arc welded joints of MDN 250 by portable Cosα X-ray diffraction method

2021 ◽  
pp. 095440892110590
Author(s):  
Bibin Jose ◽  
Manikandan Manoharan ◽  
Arivazhagan Natarajan
Keyword(s):  
Residual Stress ◽  
Welded Joints ◽  
Stress Measurement ◽  
Quantitative Estimation ◽  
Diffraction Method ◽  
X Ray Diffraction ◽  
Metallic Component ◽  
Substantial Impact ◽  
X Ray ◽  
Stress Measurements

Residual stresses are inherent stresses that exist in engineering components even though no external load is applied. They are caused by the non-uniform volumetric shift of the metallic component during manufacturing processes. Welding is a key manufacturing technique that has a substantial impact on the economy since it is required for the production of a diverse variety of products used in the engineering sector. The residual stress primarily affects the stability, durability and performance of the welded joints. Hence its determination is of utmost importance. X-ray diffraction (XRD) is the most commonly used method for residual stress analysis. There are mainly two approaches for measuring residual stress using XRD; one is the sin2ψ method and the other is the cosα method. The residual stress measurements using the cosα method are handy, quick and convenient compared to the sin2ψ method. This method is well suited for welded joints, as it provides flexibility for testing immediately after the welding operation. Apart from residual stress measurements, the cosα method also gives valuable insights in the form of Debye-Scherrer (DS) rings and full width at half maximum. The present study focuses on the development of a novel technique that not only enables residual stress measurement but also provides a quantitative estimation of hardness and qualitative estimation of grain size without performing metallurgical or mechanical characterization. The material used for the present study is an arc-welded joint of MDN 250 grade maraging steel. The residual stress results show a compressive profile throughout the weldment, with a maximum value of compressive residual stress of 428 MPa at the fusion zone.

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