-Determine the strenght of the enamel on the wire
A peel test is a mechanical test used to measure how strongly two materials (wire and enamel) stick together when one is peeled away from the other at a controlled angle and speed.
Basic idea
- In a peel test, a flexible material (like enamel) bonded to magnet wire is pulled back while the force required to separate them is continuously measured.
- The test outputs values such as maximum peel strength, initial peak force to start peeling, and average force during peeling, often normalized as peel strength per unit width.
What it is used for
- Peel tests are widely used for quality control and product development in electronics, automotive and aerospace, to ensure the joints between wire and enamel are strong and reliable.
- They help compare enamels, verify that the bonding meet standards, and diagnose why bonded joints fail in service.
How it is performed
- A sample of enamelled wire is prepared and then clamped in a testing machine that pulls the flexible layer at a defined angle (commonly 90° or 180°) and speed while recording the peel force.
- The test usually continues until a specified amount of enamel has been peeled of the wire, and the recorded force–displacement data are used to calculate peel strength.
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