Paper Title:
Suppression of Surface Effect by Using Bent-Perfect-Crystal Monochromator in Residual Strain Scanning
  Abstract

Using our long experience in Bragg diffraction optics we successfully used focusing principles for substantial increasing both luminosity and resolution of the strain scanners with respect to the conventional devices. Monochromatic neutrons are selected by the cylindrically bent monochromator from the reactor spectrum. There is a strong correlation between divergences of incoming and outgoing beams with respect to the polycrystalline sample, which can be easily manipulated by changing the monochromator bending radius. By setting a proper value of the radius, a narrow, quasiparallel and highly luminous output beam can by adjusted. The strong correlation between wavelength and direction of incoming and outgoing beams depending on the monochromator bending radius can be as well used for suppression of surface effect in residual strain scanning. In scanning near a sample surface aberration peak shifts arise due to the fact that the gauge volume defined by input and output slits is partially out of the sample and its value can be of the same order as the residual strain effects. In this work we demonstrate that by changing of the bending radius of monochromator, this surface effect can be suppressed to values smaller then experimental errors in residual strain scanning.

  Info
Periodical
Materials Science Forum (Volumes 490-491)
Edited by
Sabine Denis, Takao Hanabusa, Bob Baoping He, Eric Mittemeijer, JunMa Nan, Ismail Cevdet Noyan, Berthold Scholtes, Keisuke Tanaka, KeWei Xu
Pages
234-238
DOI
10.4028/www.scientific.net/MSF.490-491.234
Citation
M. Vrána, P. Mikula, "Suppression of Surface Effect by Using Bent-Perfect-Crystal Monochromator in Residual Strain Scanning", Materials Science Forum, Vols. 490-491, pp. 234-238, 2005
Online since
July 2005
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Shu Huang, Jian Zhong Zhou, Yi Bin Chen, C.D. Wang, X.D. Yang, Y.C. Dai
Abstract:An appropriate finite element analytical model for laser compound forming (LCF) was established with ABAQUS code, and then some key technical...
3857
Authors: Yi Nan Lai, Sheng Le Ren, Zeng Lou Li, Jun Tao Gu, Guang Fei Wu
Abstract:The unloading spring-back of tubes during its manufacturing process shows a strong nonlinearity, which greatly influences the precision of...
202
Authors: Qiang Li, Li Feng Fan, Ying Gao, Cong Hui Song, Wen Tao Yang
II. Solid Mechanics
Abstract:Air bending of wide-punch large radius of curvature, as a special bending mode, has been widely applied in the production of large diameter...
207
Authors: M. Mehrara, Mohammad Javad Nategh
Abstract:The bending of plates on rubber pad is a relatively new method used for roll bending of thin plates in recent years. In the present work the...
190
Authors: Zainal Abedin Ahmad Firdaus, Ibrahim Noordin, Ahmad Zabidi Noriza
Chapter 12: Sensors and Techniques of Measurements in Materials Science and Production
Abstract:Small angle neutron scattering (SANS) virtual experiment using silicon dioxide (SiO2) target has been performed. The results...
722