Hole drilling non-crystalline materials.

[ResidualStressMan]

X-ray diffraction can be used to measure the resdiual stress in crystalline materials, and I was told that 'hole drilling' can be used to measure the stress in a non-crystalline material.
If this is the case, is the stress in the non-crystalline material related again to the spacing between the molecules? I would assume it would be, however, if it does not have a defined structure, I would assume the space between molecules may vary.

[Claudia54]

i have to measure the residual stress of the welded plates. please tell me location or service provider of this hole drill residual stress method within india.