skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Measurement of Residual Stress Distributions by Energy Dispersive X-ray Diffraction Synchrotron Radiation


No abstract prepared.

; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
Report Number(s):
TRN: US0802862
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Int. J. Offshore Polar Eng.; Journal Volume: 16
Country of Publication:
United States

Citation Formats

Tsakalakos,T., Croft, M., Jisrawi, N., Holtz, R., and Zhong, Z. Measurement of Residual Stress Distributions by Energy Dispersive X-ray Diffraction Synchrotron Radiation. United States: N. p., 2006. Web.
Tsakalakos,T., Croft, M., Jisrawi, N., Holtz, R., & Zhong, Z. Measurement of Residual Stress Distributions by Energy Dispersive X-ray Diffraction Synchrotron Radiation. United States.
Tsakalakos,T., Croft, M., Jisrawi, N., Holtz, R., and Zhong, Z. Sun . "Measurement of Residual Stress Distributions by Energy Dispersive X-ray Diffraction Synchrotron Radiation". United States. doi:.
title = {Measurement of Residual Stress Distributions by Energy Dispersive X-ray Diffraction Synchrotron Radiation},
author = {Tsakalakos,T. and Croft, M. and Jisrawi, N. and Holtz, R. and Zhong, Z.},
abstractNote = {No abstract prepared.},
doi = {},
journal = {Int. J. Offshore Polar Eng.},
number = ,
volume = 16,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
  • An X-ray technique for the measurement of internal residual strain gradients near the continuous reinforcements of metal matrix composites has been investigated. The technique utilizes high intensity white X-ray radiation from a synchrotron radiation source to obtain energy spectra from small (10[sup [minus]3] mm[sup 3]) volumes deep within composite samples. The energy peak positions satisfy Bragg's law and allow determination of the lattice parameter. As the probe volume is translated, the peaks of the spectra shift and are used to infer lattice spacing changes and thus strains with a precision of 10[sup [minus]3] to 10[sup [minus]4] (depending on the samplemore » grain size/probe volume ratio). The viability of the technique has first been tested using a model system with 800 [mu]m Al[sub 2]O[sub 3] fibers and a commercial purity titanium matrix. For this system (which remained elastic on cooling), good agreement was observed between the measured residual radial and hoop strain gradients and those estimated from a simple elastic concentric cylinders model. The technique was then used to assess the strains near (SCS-6) silicon carbide fibers in a Ti-14Al-21Nb matrix after consolidation processing. Reasonable agreement between measured and calculated strains was seen provided the probe volume was located 50 [mu]m or more from the fiber/matrix interface. Close to the interface, the measured elastic strains were smaller than anticipated, due to relaxation of the residual stress by plasticity and radial cracking during sample cooling.« less
  • A facility is described which has been developed for the rapid acquisition of structural information through the use of heterochromatic synchrotron radiation from a sample pressurized in a diamond-anvil cell and simultaneously cooled to cryogenic temperature. The system employs a closed-cycle He refrigerator, which can be continuously operated, independent of any liquid cryogens, from a remote station. The compressive contact force between the diamonds, and hence the sample pressure, is also externally controlled, thereby providing remote control capabilities for both the pressure and temperature. NaCl has been used as an internal pressure calibrant and existing empirical equation-of-state calculations for NaClmore » have been extended to reduced temperatures for this purpose. Preliminary data on the lower pressure critical point associated with the isomorphic phase transition in Ce/sub 0.8/Th/sub 0.1/La/sub 0.1/ are presented.« less
  • A number of improvements in a facility developed over the past three years at the Stanford Synchrotron Radiation Laboratory for the study of pressure and/or temperature effects on materials are described. These include improved beam collimation to both reduce background and eliminate gasket scatter, a remote, pneumatically operated pressurizer, and introduction of a variety of electronics hardware to allow both computer control of experiments and on-line data analyses. Considerations are given to the possible effects of heating of the pressure cavity by the incident beam and to possible fluctuations of the incident beam intensity/energy profile. In both cases, there wasmore » no evidence to indicate that these phenomena warranted any further consideration, i.e., they are not considered to be problems in terms of analyzing the data. Extended measurements of a well-defined diffraction peak indicated that a considerable improvement over our earlier work has been realized in terms of the precision in the determination of the energy of the peak, viz., a precision of better than 0.04% for measurement periods as short as 10 s; the estimated precision in the net peak area is less than 3%. The system was used to examine the kinetics of the B1-to-B2 pressure-induced phase transition in KBr. The volume change in the two-phase region is measured to be 10.41% +- 0.10%, in excellent agreement with most of the previous measurements. A plot of the time dependence of the growth rate of the high-pressure phase indicates that the phase transformation can be described by the Avrami equation. Constants for the phase transition kinetics are given.« less
  • We investigated the behavior of the structure of titanium hydride (TiH{sub 2}), an important compound in hydrogen storage research, at elevated temperatures (0-120 C) and high pressures (1 bar-34 GPa). Temperature-induced changes of TiH{sub 2} as indicated in the alteration of the ambient X-ray demonstrated a cubic to tetragonal phase transition occurring at about 17 C. The main focus of this study was to identify any pressure-induced structural transformations, including possible phase transitions, in TiH{sub 2}. Synchrotron X-ray diffraction studies were carried out in situ (diamond anvil cell) in a compression sequence up to 34 GPa and in subsequent decompressionmore » to ambient pressure. The pressure evolution of the diffraction patterns revealed a cubic (Fm-3m) to tetragonal (I4/mmm) phase transition at 2.2 GPa. The high-pressure phase persisted up to 34 GPa. After decompression to ambient conditions the observed phase transition was completely reversible. A Birch-Murnaghan fit of the unit cell volume as a function of pressure yielded a zero-pressure bulk modulus K{sub 0} = 146(14) GPa, and its pressure derivative K{prime}{sub 0} = 6(1) for the high-pressure tetragonal phase of TiH{sub 2}.« less
  • The use of both conventional fixed-anode X-ray sources and synchrotron radiation to carry out energy-dispersive X-ray diffraction experiments at high pressure in a diamond anvil cell, is discussed. The photon flux at the sample and at the detector for the two cases are compared and the results are presented in graphs. It is shown that synchrotron radiation experiments can be performed with nearly two orders of magnitude increase in data rate if superior detectors and detector electronics are available. 11 references.