Slitting or Slotting

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

The slotting method can be used on metals, ceramics, and polymers, where linear elastic theory can be assumed. 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 is based on linear elastic theory and consists of machining a slot into the test part adjacent to a strain gauge. Removal of material will relax the residual stresses and the resulting change in strain is recorded at varying slot depths. The recorded change in strain is used to determine the residual stress with depth.

Slotting features

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

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 slotting 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?