Gordon England Surface Engineering Forum



Re: Residual stresses


Posted by Gordon England on March 06, 2003 at 02:19:49:

In Reply to: Residual stresses posted by Erik Schuring on March 05, 2003 at 21:09:44:

: Dear all,
: During a research programm it was mentioned that grit blasting may influence the residual stress level in thermal sprayed coatings. High compressive stresses in the base material resulting from grit blasting were said to reduce the tensile stresses in the coating.
: Can someone tell me more about this and preferably point me to some relevant literature.
: Regards

Hi Erik

I think the only way compressive stresses in the surface of a substrate will effect the residual stresses form in a coating would be if those substrate stresses were relaxed during or after spraying. During normal spraying conditions I doubt whether this is significant, particularly when you consider all the other factors effecting residual stress build-up.

You should find these links interesting, though I don't think they will directly answer your question.

http://asq.web.psi.ch/ASQ/projects/thermetcoat/JB_2000_02.pdf

http://www.msm.cam.ac.uk/mmc/research/plasmaspray/num_model_detail.html

Regards Gordon



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