05:59 Feb-17-2009 sathik Teacher Crescent Engineering College, India, Joined Sep 2004 3
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.
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.