WORLD WIDE REFERENCE PARTNER IN DYNAMIC MATERIAL TESTING INSTRUMENTS
The resonant frequency and internal friction are determined by the material structure of the measured sample and the shape and size of the sample. During a high temperature measurement the resonant frequency and internal friction of the sample is measured every 120 seconds during heating and cooling (standard settings, can be changed by the operator). Our systems can perform measurement from -100°C up to maximum 1700°C and during such a measurement the material structure of materials will undergo all kinds of changes and mapping out the resonant frequency and internal friction vs. temperature gives researchers an insight on what type of changes happened and at what temperature they occurred.
The resonant frequency of a sample is determined by it’s shape, dimensions, weight and elastic properties. So, by measuring the resonant frequency, dimensions and weight of a sample with a specific shape, we can calculate the elastic properties (ASTM E 1876).
In the impulse excitation technique the resonant frequency is determined by tapping the sample with a small hammer, recording the induced vibration signal with a microphone and analysing the vibration signal. This type of measurement is non-destructive, can be carried out in a matter of minutes and achieves overall accuracies of up to 1% if done correctly.
The impulse excitation technique calculates Young’s modulus, Shear modulus, Poisson ratio, internal friction and resonant frequency directly. By doing high temperature measurements, it’s also possible to determine relaxation, creep, brittle to ductile transition temperature, Debye temperature, …
The resonant frequency and internal friction measured using the impulse excitation technique can be seen as the fingerprint of a sample. If some event changes in the material structure of a sample this can be detected by measuring the resonant frequency and internal friction before and after the event.
Resonant frequency and internal friction are like a fingerprint of a specimen’s material structure. Therefore the impulse excitation technique is in some cases perfectly suited to be used as a quality control tool.
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At that time, the impulse excitation technique (IET) existed for more than 3000 years. When the first ceramic pots were produced, the craftsman knocked at their pots to check the ‘quality’. When we started our first developments, the IET was already standardized (ASTM C1259).
Our intension was – and still is – to bring the technique to a next level. Therefore, IMCE focused on the development of a robust signal analysis algorithm on a PC-based system which enables a very good signal analysis even under very rough circumstances with short signal lengths.
RFDA measurement devices
IMCE provides measurement systems and services to characterize elastic material properties such as Young’s modulus, shear modulus, Poisson’s ratio and internal friction. The Resonant Frequency and Damping Analyzer (RFDA) is based on the impulse excitation technique. Worldwide leading innovative software and hardware technology provide state of the art solutions for R&D laboratories and research institutes. IMCE offers elastic properties measurement systems according to ISO, ASTM and ENV standards at room temperature as well as at high temperature.
Benefits of RFDA measurement devices
- Non-destructive measurement of elastic and damping properties
- Large temperature range: -50 °C – 1700 °C
- Applicable to porous and brittle materials due to small strains
- Information about internal structure, damage
- Reliable, fast and easy accessible measurement technique
- Limited restrictions on sample geometry and dimensions