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- since 1996 -

AT-Automation Technology GmbH
AT -Automation Technology is a systems house for industrial image processing. AT offers thermographic ndt systems as well as high-speed 3D sensors.
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sathik
Teacher
Crescent Engineering College, India, Joined Sep 2004, 3

sathik

Teacher
Crescent Engineering College,
India,
Joined Sep 2004
3
05:59 Feb-17-2009
Laser shearography help

Dear sir/ Madam
I am s.sathik basha, working in crescent engineering college, chennai, India. Now i am in process of buying Laser shearography instrument.
I want to know whether this instument is applied to measure the residual stress of the welded components. Plese tell me how to measure the residual stress using laser shearography and what are necessary requirements.

Please help me in this matter.

Expecting your favourable reply.

Yours sincerely

S.Sathik Basha

 
 Reply 
 
Anand Asundi
Director,
Nanyang Technological University, Singapore, Joined Feb 2001, 10

Anand Asundi

Director,
Nanyang Technological University,
Singapore,
Joined Feb 2001
10
06:32 Feb-27-2009
Re: Laser shearography help
In Reply to sathik at 05:59 Feb-17-2009 (Opening).

While there are some papers on Shearography for residual stress determination, I am not sure how best it can be effectively used for this measurement. As with strain gauge methods, to determine residual stress , the hole drilling approach is adopted. However, with optical methods while they do provide whole field information, we would need information from two or three patterns to get the complete state of strain and thus residual stress. Of course if the interest is to just visualize whether stress is present or not , then one picture may suffice.

 
 Reply 
 

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