Hardness Testing is completed on a component or sample to measure its resistance value when a force is applied, this will identify a material and its characteristics or as a quality check to ensure that the sample meets a particular specification.
IACS NDT can perform either Ultrasonic Contact Impedance (UCI) using portable testing devices which have been developed to permit in-situ hardness measurements thus offering quick and economical supplements to conventional, stationary testing machines.
UCI method of testing is completed by measuring the frequency shift of a resonating rod which is tipped with a Vickers diamond. As the diamond penetrates the test material with a specific test load the frequency shift is evaluated and digitally converted to a hardness value.
UCI testing method is well suited for the testing of pipes of all thickness, Heat affected Zone hardness testing and difficult to access positions.
The rebound method of testing measures the velocity of the impact body before and after impact onto the test material surface. A ratio calculation of both the measured velocities is then completed and compared on a conversion table to determine the materials hardness.
The Rebound testing method is well suited for the testing solid parts, coarse grain materials and steel and aluminium castings.
The Hardness of a material is dependent on ductility, elastic stiffness, plasticity, strain, strength, toughness, viscoelasticity, and viscosity.
Advantages of onsite Hardness Testing:
- Possibility of measuring the hardness value of products with any weights and thickness from 1 mm.
- Small mark on the surface of the tested product (user can test mirror surfaces, necks shafts, knives, gear teeth, etc.)
- Independent mobile measurements, also capable of functioning in all directions within tight spaces.
- Capable of taking measurements on large objects, in difficult test positions and challenging component geometries, such as at the base of gear teeth and similar.
- Fast, reliable measurements.
- Small indentation size/depth – the process can be considered Non-destructive.
- Highly reproducible results and lower sensitivity even in the case of unsymmetrical test indentations since the entire contact surface can be included in hardness calculations.