Computer Aided Nondestructive Evaluation Method of Welding Residual Stresses by Removing Reinforcement of Weld (Proposal of a New Concept and Its Verification)

2008 ◽  
pp. 128-128-15 ◽  
Author(s):  
K Kumagai ◽  
H Nakamura ◽  
H Kobayashi
Keyword(s):  
Residual Stresses ◽  
Nondestructive Evaluation ◽  
Evaluation Method ◽  
Computer Aided

Ultrasonic Evaluation of Compressive Residual Stress of Surface Treated Metals

2005 ◽  
Vol 490-491 ◽  
pp. 184-189 ◽  
Author(s):  
Farid Belahcene ◽  
Xiaolai Zhou ◽  
Jian Lu
Keyword(s):  
Experimental Data ◽  
Residual Stresses ◽  
Nondestructive Evaluation ◽  
Subsurface Layer ◽  
Surface Mechanical Attrition Treatment ◽  
Shallow Subsurface ◽  
Ultrasonic Evaluation ◽  
Mechanical Attrition ◽  
Machine Parts ◽  
Compressive Residual Stresses

Shot peening is an effective method of improving fatigue performance of machine parts in the industry by producing a thin surface layer of compressive residual stresses that prevents crack initiation and retards crack growth during service. Nondestructive evaluation of the prevailing compressive residual stresses in the shallow subsurface layer is realized by the critically refracted longitudinal (Lcr) waves. This paper presents experimental data obtained on SMAT (surface mechanical attrition treatment) steel alloy S355 sample. Comparative travel-time shows that there are statistically significant differences in treated and untreated specimen. With knowledge of the acoustoelastic constants which are obtained by a test calibration, the experimental data indicates that compressive residual stresses are distributed near subsurface (hundreds of micron). These stress results show that the Lcr technique is efficient for evaluation of residual stresses after the surface treatment.

Numerical analysis of an electromagnetic nondestructive evaluation method for rotating machinery

2010 ◽  
Vol 33 (3-4) ◽  
pp. 1101-1107
Author(s):  
Haoyu Huang ◽  
Ryo Kayata ◽  
Stephane Perrin ◽  
Noritaka Yusa ◽  
Kenzo Miya
Keyword(s):  
Numerical Analysis ◽  
Nondestructive Evaluation ◽  
Evaluation Method ◽  
Rotating Machinery

FORENSIC EXAMINATION USING A NONDESTRUCTIVE EVALUATION METHOD FOR SURFACE METROLOGY

2009 ◽  
Author(s):  
David J. Eisenmann ◽  
L. Scott Chumbley ◽  
Donald O. Thompson ◽  
Dale E. Chimenti
Keyword(s):  
Nondestructive Evaluation ◽  
Evaluation Method ◽  
Surface Metrology ◽  
Forensic Examination

A new method for M-integral experimental evaluation

2012 ◽  
Vol 22 (2) ◽  
pp. 238-246 ◽  
Author(s):  
Hong Zuo ◽  
Yu-hong Feng
Keyword(s):  
Stress Distribution ◽  
Nondestructive Evaluation ◽  
Experimental Measurement ◽  
Measurement Method ◽  
Evaluation Method ◽  
Specimen Geometry ◽  
Related Integral ◽  
Integral Contour ◽  
M Integral ◽  
Distribution Assumption

In this article, the experimental measurement method of M-integral is investigated. Through the detailed analysis to the nondestructive evaluation method of J- and M-integrals suggested by King and Herrmann, it is found that the specimen geometry which they selected and the corresponding clamping mode in their test exists a conflict with the stress distribution assumption on the integral contour. The formulas they proposed cannot represent the selected specimen geometry and the related integral contours. To avoid this conflict, a new experimental measurement method and a simper specimen style is proposed in this study. According to the method, the M-integral is nondestructive evaluated experimentally through the new specimen and the new clamping mode.

Computer-aided volumetric evaluation method for gray matter in the brain and the spinal cord by T1-weighted inversion recovery MRI

2001 ◽  
Vol 1230 ◽  
pp. 1154-1155
Author(s):  
Nobuhiro Tsukamoto ◽  
Hideo Kumagai ◽  
Kiichiro Saitoh ◽  
Masahiko Monma ◽  
Yutaka Ando ◽  
...  
Keyword(s):  
Spinal Cord ◽  
Gray Matter ◽  
Evaluation Method ◽  
Inversion Recovery ◽  
Computer Aided ◽  
The Brain
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