Hole Expansion Capacity testing, as prescribe by ISO 16630, is a method to determine the edge crack forming characteristics of materials. Hole expansion testing is especially popular in determining the ductility and strength properties of high strength steels which are used in a variety of industries, especially the automotive industry in the form of strips and sheets. The test is performed by driving a conical punch through the punched hole of a test blank until a crack is detected by visual inspection. The initial diameter is then divided by the expanded hole diameter to calculate the hole expansion ratio. This ratio allows manufacturers and designers to compare the edge crack sensitivity of different materials and allows for lighter designs to be created if the crack forming properties of the material can be characterized.
Initial Hole Expansion Capacity Test
Final Hole Expansion Capacity Test
If you are looking for the ability to characterize the ductility properties of your material, such as an automobile manufacturer looking to use lightweight steel to obtain a lower overall car weight, contact Standard Mechanics today to get the test results and expert guidance you need.
Don't see a test that fits your needs? Contact us to discuss custom testing solutions.