Leeb Hardness – Rebound Technique

The portable hardness testers used most commonly worldwide are based on the user-friendly rebound technique, measuring the Leeb hardness. Dietmar Leeb and Dr. Marco Brandestini, both at their time part of the Proceq team, invented the Leeb hardness to the motto “easy hardness testing anywhere”. All of Proceq’s Equotip measuring devices operate according the Leeb hardness method.

The Leeb hardness measuring principle is physically a rather simple, dynamic hardness test. An impact body with a hard metal test tip is propelled by spring force against the surface of the test piece. Surface deformation takes place when the impact body hits the test surface, which will result in loss of kinetic energy. This energy loss is calculated by velocity measurements. When the impact body is passing the coil at a precise distance from the surface, a signal voltage is induced during the impact and rebound phase of the test. The voltages are proportional to the velocity. Signal processing by the electronics provides the Leeb hardness reading for display and storage.

	1. Load: Simply load the impact device by sliding the loading tube forward and backward.
	2. Place: Then place and hold the impact device on the surface of the test piece at the desired test point.
	3. Measure: Trigger the impact. The hardness value will be instantaneously displayed.

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