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Technical Discussions
Ram
NDT Inspector, -
Kuwait, Joined Jan 2010, 13

Ram

NDT Inspector, -
Kuwait,
Joined Jan 2010
13
05:56 Mar-13-2010
residual Stress measurement by UT

Dear All,
is there any techniques to measure residual Stress of of material by ULTRASONIC TESTING?
can anyone help me to measure the stress?

regards
rama

    
 
 
Wieslaw Bicz
Engineering,
PBP Optel sp. z o.o., Poland, Joined Feb 2009, 247

Wieslaw Bicz

Engineering,
PBP Optel sp. z o.o.,
Poland,
Joined Feb 2009
247
11:15 Mar-13-2010
Re: residual Stress measurement by UT
In Reply to Ram at 05:56 Mar-13-2010 (Opening).

It is possible with the help of shear waves. The velocity of shear waves changes due to the stress. It is used in many applications, especially in screws control devices.

    
 
 
ram
NDT Inspector, -
Kuwait, Joined Jan 2010, 13

ram

NDT Inspector, -
Kuwait,
Joined Jan 2010
13
11:44 Mar-13-2010
Re: residual Stress measurement by UT
In Reply to Wieslaw Bicz at 11:15 Mar-13-2010 .

Dear wieslaw,
how we can measure the stress of weld joints any procedure?

    
 
 
Wieslaw Bicz
Engineering,
PBP Optel sp. z o.o., Poland, Joined Feb 2009, 247

Wieslaw Bicz

Engineering,
PBP Optel sp. z o.o.,
Poland,
Joined Feb 2009
247
13:57 Mar-13-2010
Re: residual Stress measurement by UT
In Reply to ram at 11:44 Mar-13-2010 .

I can imagine, that only one possibility exists: ultrasonic holography, that involves information, coming from all kinds of waves.

This is not commonly used technique. We have large experience with it, but mostly for other purposes.

It should be basically possible to solve any the inverse problem with this technique, also this one, that is interesting for you, but this is far away from being simple.

    
 
 
P V SASTRY
R & D, NDT tecniques metallurgy
TAKEN VRS FROM THE POSITION OF SR. DEPUTY GENERAL MANAGER BHEL CORPORATE R&D, India, Joined Jan 2003, 195

P V SASTRY

R & D, NDT tecniques metallurgy
TAKEN VRS FROM THE POSITION OF SR. DEPUTY GENERAL MANAGER BHEL CORPORATE R&D,
India,
Joined Jan 2003
195
16:27 Mar-13-2010
Re: residual Stress measurement by UT
In Reply to ram at 11:44 Mar-13-2010 .

Dear Ram,

The answer to your first question is yes, it is possible to measure the residual stresses by Ultrasonic techniques. There are various techniques available.

All the techniques that I know use the principal of variation of ultrasonic velocity as a function of residual stresses present in the material/component. If another parameter like chemical composition, microstructure (grain size etc.), temperature etc., that contribute to change in the ultrasonic velocity is varying simultaneously then things become complicated. The acoustoelastic constant that is calculated based on the velocity measurements is to be freed from the influence of the other parameter before it is correlated with residual stresses.

Even the other popular method of measurement of residual stresses using Barkhausen noise principals also suffers from the same problems. We use this method regularly for measurement of residual stresses both in laboratory and field. We have largely overcome the influence of the other interfering parameters by generating specific calibration curves.

With respect to the Ultrasonic measurements of residual stresses, we did some experiments using LCR waves generated by a single focused probe in immersion mode with an advanced scanner. This technique enables us to measure residual stresses on the surface and near surface. In the through pulse echo technique the average of the bulk stresses are only measured. Our measurements were mostly confined to the laboratory (being immersion technique).

The following paper gives an insight into various Ultrasonic measurement techniques and can be down loaded from the net.

CURRENT DIRECTIONS OF ULTRASONIC STRESS MEASUREMENT TECHNIQUES By Don E. Bray, Ph. D., P. E., Don E. Bray Inc.,
Email : debray@brayengr.com

With respect to your second question- it is possible to measure the residual stresses on and near the weld joint by using simple pulse echo techniques (compressional waves) as well as LCR wave technique. The following paper gives some insight into the measurements of residual stresses on weld joints. This also can be down loaded from the net.

POTENTIALITIES OF ULTRASONICS FOR EVALUATING RESIDUAL STRESSES: INFLUENCE OF MICROSTRUCTURE
By H. WALASZEK, Y. ABDALLAHOUI, H.P. LIEURADE


There are a few other papers on this subject. I am not able to directly give their reference due to my preoccupation with other things. You can do a search on the net. You are most welcome to contact me if you need any clarifications on any of the aspects mentioned in the above literature.

With Best wishes

P V SASTRY

    
 
 
Marcin
NDT Inspector
Energodiagnostyka, Poland, Joined Jun 2009, 2

Marcin

NDT Inspector
Energodiagnostyka,
Poland,
Joined Jun 2009
2
16:22 Mar-14-2010
Re: residual Stress measurement by UT
In Reply to Ram at 05:56 Mar-13-2010 (Opening).

Hi

I use for measure residual stress MMM (metal magnetic memory) device. It is very good for pre - test before ultrasonic testing.
If you have more information please send email mmm@energodiagnostyka.pl

best regrads

mwisnioch

    
 
 
Yuri
Engineering,
Structural Integrity Services Inc. (SINTES), Canada, Joined Jan 2002, 1

Yuri

Engineering,
Structural Integrity Services Inc. (SINTES),
Canada,
Joined Jan 2002
1
20:52 Mar-14-2010
Re: residual Stress measurement by UT
In Reply to Ram at 05:56 Mar-13-2010 (Opening).

Download UltraMARS

Dear All,

I am in business of development and application of ultrasonic technique UltraMARS for residual stress measurement in welded elements and structures since 1977. I would like to use this opportunity to provide you more info on ultrasonic technique and equipment for residual stress measurement. (see also the attachment)

This technique is non-destructive. So, one can measure the residual stresses in the same points many times studying the level of residual stresses depending on the parameters of technological process, the changes of residual stresses under the action of stress-relieving techniques and service loading.

The Ultrasonic Computerized Complex (UCC) includes a measurement unit with transducers and basic supporting software and a laptop (optional item) with an advanced database and an Expert System for analysis of the influence of residual stresses on the service life of welded elements.

The basic package for residual stress measurement includes the measurement unit with basic software and transducers, which is enough to perform measurement and computation of residual stresses.

Optional software UltraMARS contains an advanced database for residual stress measurement and analysis and an Expert System for calculation of the influence of residual stresses on the fatigue life of welded elements. For convenience these two programs are installed on a laptop that is connected to ultrasonic measurement unit.

We can perform the residual stress measurement as a service by ourselves or to provide the ultrasonic equipment for this purpose.

If there is an interest from your side I could mail to you a CD with more info with papers, photos, videos. Please provide postal address for this purpose.

Do not hesitate to contact me if you have any other questions on ultrasonic residual stress measurement.

Best regards,

Yuri
__________________________
Dr. Yuri F. Kudryavtsev, Head
PreStress Engineering Division
Integrity Testing Laboratory Inc.
80 Esna Park Drive, Units 7-9
Markham, Ontario L3R 2R7
Canada
E-mail: ykudryavtsev@itlinc.com
Tel.: 905-415 2207
Fax: 905-415 3633

Visit us at http://itlinc.com/stress_engineering.html
    
 
 

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