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News (updated
3/31/10)
ASTM E-1316-10a Standard Terminology for Nondestructive Evaluation, now lists LCR as the accepted expression for bulk longitudinal waves propagating at the surface of a material.
Ultrasonic Characterization of Hydrogen Induced Stress in 4140 Steel was presented by Dr. Bray at the 30 March 2010 Meeting of the Northwestern Houston SubSection of the ASME. [ Download Presentation ]
Reversible hydrogen induced stress has been measured using the LCR technique in 4140 steel samples [ Download Abstract ]
Don E. Bray presented a paper entitled "Using the LCR Ultrasonic Technique for Thin Walled Vessels and Piping" at the 2009 ICPIIT, Houston, Texas June 2009
Santos, A. A., Andrino, M. H., Bray D. E., and Trevisan, R. E., "Evaluation of Stresses Generated by Welding in API 5L X65 Steel using Acoustoelasticity," Materials Evaluation, V. 66, N. 8, August 2008, pp. 858-864.
LCR Stress Measurement Around the Globe
Two projects this year (2007) have further demonstrated the usefulness of the LCR StressMap technique in two other areas, a round-robin related to residual stress in titanium samples and another for evaluating stress overload and hydrogen attack in steels.
LCR Demonstrations 2007 (.doc)
USITutor ultrasonic training software has been tested on Vista and on Windows XP on an Intel Mac and it runs normally.
Research Programs (5 Years)
Texas Research Institute, Austin, Texas - evaluate LCR ultrasonic technique for predicting crystallographic orientation in aircraft turbine blades, April 2006.
Temple Inland, Diboll, Texas, Investigate using ultrasound to detect rocks in gypsum slurry in wallboard manufacture. June 2006 - present.
Patents
"Ultrasonic Characterization of Polymeric Containers."
With Raed Al-Zubi (Application 10/679,658). 4/07/05,
Submitted Sept 2003, Allowed 3/23/2006.
Latest version of the LCR StressMap probe undergoing evaluation
at a US aluminum plate rolling facility. See
LCRStressmap for info.
Consulting
Carrigan McCloskey & Roberson, Houston, Texas Expert witness on extension ladder operation. Sept 2009
Rice & Sanes LLP, Angleton, Texas Advise on function of dog leash. 2009 - present
Fisher, Boyd, Brown, Boudreaux and Huguenard, LLP, Houston, Texas, Analysis of garage door accident. October 2006 - present
Earl G. Pitre, Attorney, Lake Charles, LA, - Advise on accident involving ATV. Nov 2005 - Sept 2006.
Melissa Murrah, Kelly, Smith and Murrah, P. C., Attorneys, Houston, Texas, Perform tests and advise on strength of steel banding. March 2006.
Swift and Harrington, Attorneys, Palestine, Texas, Advise on trailer hitch failure, June 2006.
Reviewed Journal Publications
Santos, A. A., Andrino, M. H., Bray D. E., and Trevisan, R. E., "Evaluation of Stresses Generated by Welding in API 5L X65 Steel using Acoustoelasticity," Materials Evaluation, V. 66, N. 8, August 2008, pp. 858-864.
Bray, Don E., and Raed Al-Zubi, "Evaluating Ultraviolet Degradation
in Cross-Linked Polyethylene Storage Tanks using Ultrasound," Materials
Evaluation, Vol, 64, No. 3, March 2006, pp. 285-292.
Bray,
Don E., Vela, John M., and Al-Zubi, Raed, "Stress And
Temperature Effects On Ultrasonic Properties In Cross Linked And
High Density Polyethylene," Journal of Pressure
Vessel Technology, Vol. 127, No. 3, August 2005, pp. 220-225.
dos
Santos, Auteliano, Bray, Don E., Andrino, Marcello H., and Trevisan,
Roseanna, "Application of Acoustoelasticity to Evaluate Stress
Relaxation in API 5L x70 Steel for Pipelines," Materials
Evaluation, Vol, 63, No. 5, May 2005, pp. 511-515.
Conference
Publications / Proceedings
Bray, Don E., "Performance Comparison of Two LCR Probes Using a Reference Frame," Review
of Progress in Quantitative Nondestructive Evaluation, Brunswick, Maine, 31 July - 5 August 2005, Vol. 25B, American Institute of Physics, 820, pp. 1442-1449.
Presentations
Ultrasonic Characterization of Hydrogen Induced Stress in 4140 Steel was presented by Dr. Bray at the 30 March 2010 Meeting of the Northwestern Houston SubSection of the ASME. [ Download Presentation ]
"Ultrasonic Stress Measurement using the LCR Wave," Residual Stress Summit 2007, Oak Ridge, Tennessee, 2-4 October 2007.
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What is Nondestructive Testing? A very good overview of
the justification and physical bases for NDE is on the ASNT home
page.
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