scholarly journals The Fundamental Principles and Techniques of X-Ray Stress Measurement and Current Developments in the Field. III: Surface Stress and Textured Materials.

1999 ◽  
Vol 48 (1) ◽  
pp. 89-95
Author(s):  
Takao HANABUSA
Keyword(s):  
Surface Stress ◽  
Stress Measurement ◽  
X Ray ◽  
Textured Materials

A Practical ϕ-Method for the Evaluation of Stress on Materials with Stress Gradient by X-rays

1984 ◽  
Vol 28 ◽  
pp. 265-274 ◽  
Author(s):  
Toshihiko Sasaki ◽  
Makoto Kuramoto ◽  
Yasuo Yoshioka
Keyword(s):  
Stress Measurement ◽  
Stress Gradient ◽  
X Rays ◽  
Present Stage ◽  
Linear Distribution ◽  
Triaxial Stress State ◽  
X Ray ◽  
Depth Direction ◽  
Textured Materials ◽  
Distribution Of Stress

Nonlinear sin2ψ curves are often obtained in X-ray stress measurement. One of the reasons, for non-textured materials, is a steep stress gradient snowing in a surface layer of a sample. Regarding such experimental results, several new principles have been developed for X-ray stress analysis. At the present stage, we can evaluate the stress gradient in a triaxial stress state. As the next stage of the investigation, it is necessary to consider the validity of the assumptions taken in the principle, especially, the assumption about linear distribution of stress along the depth direction.

Estimation of Ahisotropy of X-Ray Elastic Modulus in Steel Sheets

1985 ◽  
Vol 29 ◽  
pp. 21-28 ◽  
Author(s):  
Shin-ichi Nagashima ◽  
Masaki Shiratori ◽  
Ryuichi Nakagawa
Keyword(s):  
Elastic Modulus ◽  
Stress Measurement ◽  
Three Dimensional ◽  
Orientation Distribution ◽  
Vector Method ◽  
X Ray ◽  
Steel Sheets ◽  
Lattice Strains ◽  
Stress Ratios ◽  
Textured Materials

The oscillation from a linear relation in the 20 vs. sin2ψ diagram has been a most important problem in X-ray stress measurement. There are, therefore, a number of papers concerned with the X-ray elastic constant, lattice strains under stresses and evaluation of stresses of textured materials.The purpose of the present study is to analyze the three-dimensional orientation distribution of steel sheets by means of the Vector method proposed by Ruer and Baro, and to calculate the elastic modulus of textured sheets by means of a finite element method (FEM) using the three-dimensional orientation distribution, and then to calculate the strain/stress ratios vs. the directions defined by the angles between the specimen normal and the normal to the diffracting planes.

Residual Stress Analysis of Textured Materials by X-Ray Diffraction Method

2012 ◽  
Vol 706-709 ◽  
pp. 1673-1678 ◽  
Author(s):  
Shouichi Ejiri ◽  
Toshihiko Sasaki ◽  
Yukio Hirose
Keyword(s):  
Residual Stress ◽  
Elastic Constant ◽  
Stress Analysis ◽  
Nonlinear Problem ◽  
Elastic Constants ◽  
Lattice Strain ◽  
Stress Measurement ◽  
X Ray Diffraction ◽  
X Ray ◽  
Textured Materials

The residual stress measurement by the conventional X-ray diffraction was formulated on the assumption that a specimen from polycrystalline materials was quasi-isotropic and homogeneous, and the stress was biaxial and almost constant within the X-ray penetration depth. Therefore, it was not available to analyze the stress state of the textured materials by the conventional measurement as a general rule. In resent years, advanced methods have been proposed for the X-ray stress measurement of textured materials. In some methods, it is assumed that the X-ray elastic constant is derived from the crystallite orientation distribution function of textured materials for solving the first anisotropic problem. However, there is a nonlinear problem in the stress analysis from the measured lattice strain. In present study, the X-ray elastic constants were averaged as the expected value around the normal direction of the X-ray diffraction in a similar way. A stress analysis was proposed by differential calculus of the X-ray elastic constant in order to the avoidance of nonlinear problem. The stress analysis was applied to residual stress measurements of a titanium carbide coating film with preferred orientation and a cold-rolled steel with texture. The calculated values of the X-ray elastic constants showed the linearity on some condition for the film. The X-ray stress determination was carried out by the fitting the gradients of the measured lattice strain.

scholarly journals Statistical analysis of the reproducibility of residual stress measurements in cold extruded parts

2021 ◽  
Author(s):  
Fabian Jaeger ◽  
Alessandro Franceschi ◽  
Holger Hoche ◽  
Peter Groche ◽  
Matthias Oechsner
Keyword(s):  
Residual Stress ◽  
Statistical Analysis ◽  
Stress Measurement ◽  
Industrial Applications ◽  
Cold Extrusion ◽  
X Ray Diffraction ◽  
Forming Process ◽  
X Ray ◽  
Stress States ◽  
Key Aspects

AbstractCold extruded components are characterized by residual stresses, which originate from the experienced manufacturing process. For industrial applications, reproducibility and homogeneity of the final components are key aspects for an optimized quality control. Although striving to obtain identical deformation and surface conditions, fluctuation in the manufacturing parameters and contact shear conditions during the forming process may lead to variations of the spatial residual stress distribution in the final product. This could lead to a dependency of the residual stress measurement results on the relative axial and circumferential position on the sample. An attempt to examine this problem is made by the employment of design of experiments (DoE) methods. A statistical analysis of the residual stress results generated through X-Ray diffraction is performed. Additionally, the ability of cold extrusion processes to generate uniform stress states is analyzed on specimens of austenitic stainless steel 1.4404 and possible correlations with the pre-deformed condition are statistically examined. Moreover, the influence of the coating, consisting of oxalate and a MoS2 based lubricant, on the X-Ray diffraction measurements of the surface is investigated.

scholarly journals The X Ray Stress Measurement of Super-Duraimin under Tensile and Compressive Stress.

1944 ◽  
Vol 10 (38-1) ◽  
pp. 17-22
Author(s):  
Toshio NISHIHARA ◽  
Kohei KOZIMA ◽  
Shuzi TAIRA ◽  
Yutaro KOSAKA ◽  
Takeo TOMIYASU
Keyword(s):  
Compressive Stress ◽  
Stress Measurement ◽  
X Ray
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