1. Brinell hardness test method: This is a commonly used metal hardness test method, which is applicable to various metals and alloys. This method uses a steel ball or drill bit with standard geometric shape and size, presses a certain load on the aluminum plate to be tested, and determines the hardness value according to the indentation depth. The hardness value of aluminum plate is usually expressed in Brinell hardness (HB).
2. Wright hardness test method: This is also a commonly used metal hardness test method, especially suitable for thinner metal sheets. This method uses a drill bit with a standard geometry and size to apply a load on the aluminum plate to be tested at a certain rate, and then calculates the hardness value based on the penetration depth of the drill bit into the aluminum plate. The hardness value of aluminum plate is usually expressed in Wright hardness (HR).

No matter which test method is used, it needs to be tested under suitable conditions, such as under constant temperature, humidity and load conditions, to ensure the accuracy and comparability of test results. At the same time, before the hardness test, the aluminum plate needs to be surface treated and flattened to ensure that the test results reflect the hardness of the aluminum plate itself.