Intefacial Fracture

Hello, imechanicians,

  If you are (or to be) an experimentalist and have a good idea, please help me!

  I have a Si - Si DCB and would like to initiate a crack and hold it as it is (similar to a crack initiated in mica with a razor blade) According to my calculation, I need something like 1 to 5 um thickness. It could be sometime like a wedge shape.

  If you have any good idea, please give me a suggestion!

 Thank you,

Masa