Slotting Method or Slitting Method

Slotting method, referred to the slitting method, is a mechanical measurement used to determine a single component of residual stress incrementally with depth.

This method is used on metals, ceramics, and polymers, wherever slitting can assume the linear elastic theory. Materials that cannot be tested by X-ray diffraction, such as coarse grain or amorphous materials, can be tested with the slotting method.

How does it work?

The method uses linear elastic theory which consists of machining a slot into the test part adjacent to a strain gauge. Removal of material will relax the residual stresses and changes the resulting strain that’s recorded at varying slot depths. The recorded change is used to determine the residual stress with depth.


Slotting is easy to perform and can be used when residual stress measurement is only needed for one direction.

Other features include:

  • Incremental residual stress measurement up to a nominal depth of 0.2 in. (5 mm)
  • Amount of material removed is comparable to the ring-core method

How are Lambda’s services superior?

Lambda is a recognized leader in the field of residual stress measurement, with extensive experience testing all types of materials, including metallics, ceramics, and polymers of nearly any shape and size.

  • We can test components in our laboratory or in the field
  • All residual stress measurements are performed by our certified residual stress engineers and technicians
  • Lambda does not subcontract residual stress testing to a third party

Questions about slotting or other residual stress measurement needs?

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