Ultrasonic Research, Nondestructive Evaluation, Mechanical Engineering
   
 

             CONSULTING AND RESEARCH

 
  • Ultrasonic NDE
  • Ultrasonic Research
  • Ultrasonic Stress Measurement
  • Mechanical Engineering and CAD
  • Stress Analysis
  • Design of Experiments
     
 
 
 

News  (updated 6/28/12)

Bray, Don E. and Ainsworth, Paul J., "Acoustoelastic Coefficients for Commercially Produced 6XXX and 7XXX Series Aerospace Aluminum Plate," 2012

Bray, Don E. and Griffin, Richard B., "Monitoring Hydrogen Release from 4140 Steel using the LCR Ultrasonic Technique," International Symposium on Nondestructive Testing of Materials and Structures, NDTMS-2011, 15-18 May 2011, Istanbul, Turkey, Session 5D

"Ultrasonic Characterization of Hydrogen Induced Stress in Pipelines" was presented by Dr. Bray at the October 20-21 2010 Meeting of the International Offshore Pipeline Forum in Houston, TX. [ Download Presentation ]

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)
Demonstration of the LCR wave for evaluation of hydrogen induced stress in steels - self funded, ongoing.

Texas Research Institute, Austin, Texas - evaluate LCR ultrasonic technique for predicting crystallographic orientation in aircraft turbine blades, April 2006.

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
Frasier, Frasier and Hickman, LLP, Tulsa, OK Expert advice on operation of telescoping bleacher seats, 2012-present.

Rice and Sanes, Attorneys, Pearland, Texas, Expert advice on operation of printing press for flower pots, 2011-2012.

Mattingly Law Firm, Houston, Texas, Expert advice on operation of turbine wheel separating device, 2011.

Cowles & Thompson, Tyler, Texas, Expert advice on operation of hooka device for diving, 2011-present.

Alan W. Clark and Assoc., LLC, Attorneys at Law, Levittown, New York, Expert witness advice on failure of a stepladder, 2010.

The Gibson Law Firm, Houston, Texas, Expert witness testimony for failure of step ladder, 2009-2010.

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 - 2010.

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.

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. Click here

 
     
 
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all contents copyright Don E. Bray, Inc. 2010