Where Are Notches Used?

Notches are commonly used in material impact tests where a morphological crack of a controlled origin is necessary to achieve standardized characterization of fracture resistance of the material. The most common is the Charpy impact test, which uses a pendulum hammer (striker) to strike a horizontal notched specimen.

What are notches used for?

Pattern notches are small marks made on the pattern to ensure that one pattern piece will match up to the pattern next to it. They can be used to show what the value of the seam allowance is, and can also be used as markers along a seam to make sure that the two pieces of fabric will come together correctly when sewn.

Where do you put notches?

Put notches in the same places on the back pattern piece, so that when you join the pieces, the notches will match. For example, when putting a notch on the side seam of the back pattern piece, I will put it in the same position as the front - which is at the top of the seam.