The Fraunhofer Institute for Nondestructive Testing IZFP carries out research and development activities in the field of nondestructive testing processes along the entire materials value chain. For customers in the automobile, aerospace, rail, energy, construction and agriculture industries, the institute offers a wide range of NDT expertise and technologies. At the 19th World Conference on Non-Destructive Testing, our engineers will be presenting the acoustic resonance testing (ART) - an integral nondestructive testing method that is used to inspect components and assemblies with regard to different properties or variations in quality.
Acoustic resonance testing (ART) is an integral nondestructive testing method that is used to inspect components and assemblies with regard to different properties or variations in quality by evaluating the test object’s eigenfrequencies or other parameters determined from its natural vibration behavior.
As a comparative method, ART mainly focusses on the examination of serial parts which are produced in large quantities and with low cycle times, e.g. forged or casted metallic parts. Besides the possibility for complete automation, a big advantage of ART compared to other volume-oriented methods is the fast in-line quality assessment of an entire specimen within a matter of seconds.
The principle of ART is based on the fact that a specimen’s natural vibration behavior and its eigenfrequencies mainly depend on geometry and material properties, but also on structural defects, e.g. cracks.
One objective of ART is to detect defective parts by evaluating the test object’s measured eigenfrequencies. Generally, the exact geometric dimensions and the exact material properties of single parts in a serial production vary randomly within acceptable ranges, for example because of manufacture-related effects, entailing variations in the eigenfrequencies of the good parts.
These effects are superposed by changes in the eigenfrequencies caused by intolerable component variations. This impedes a reliable classification of the components with the help of ART. To solve this problem a new compensation method of those random perturbations respectively a method to differ between eigenfrequency shifts caused by acceptable as well as intolerable variations is required.
A current research project focusses on detecting forged or casted metallic parts with intolerable geometric variations by evaluating the component’s eigenfrequencies, whereat such parts are also characterized by large acceptable component variations.
Previous investigations using simulated data showed that the exact dimensions of components can be estimated from their eigenfrequencies after describing those correlations with the help of linear regression analyses. This contribution presents the latest results of the project, especially the adjustment of this procedure to real parts and the associated difficulties.
Sabine Poitevin-Burbes | Fraunhofer-Institut für Zerstörungsfreie Prüfverfahren IZFP
Mat4Rail: EU Research Project on the Railway of the Future
23.02.2018 | Universität Bremen
Atomic structure of ultrasound material not what anyone expected
21.02.2018 | North Carolina State University
A newly developed laser technology has enabled physicists in the Laboratory for Attosecond Physics (jointly run by LMU Munich and the Max Planck Institute of Quantum Optics) to generate attosecond bursts of high-energy photons of unprecedented intensity. This has made it possible to observe the interaction of multiple photons in a single such pulse with electrons in the inner orbital shell of an atom.
In order to observe the ultrafast electron motion in the inner shells of atoms with short light pulses, the pulses must not only be ultrashort, but very...
A group of researchers led by Andrea Cavalleri at the Max Planck Institute for Structure and Dynamics of Matter (MPSD) in Hamburg has demonstrated a new method enabling precise measurements of the interatomic forces that hold crystalline solids together. The paper Probing the Interatomic Potential of Solids by Strong-Field Nonlinear Phononics, published online in Nature, explains how a terahertz-frequency laser pulse can drive very large deformations of the crystal.
By measuring the highly unusual atomic trajectories under extreme electromagnetic transients, the MPSD group could reconstruct how rigid the atomic bonds are...
Quantum computers may one day solve algorithmic problems which even the biggest supercomputers today can’t manage. But how do you test a quantum computer to...
For the first time, a team of researchers at the Max-Planck Institute (MPI) for Polymer Research in Mainz, Germany, has succeeded in making an integrated circuit (IC) from just a monolayer of a semiconducting polymer via a bottom-up, self-assembly approach.
In the self-assembly process, the semiconducting polymer arranges itself into an ordered monolayer in a transistor. The transistors are binary switches used...
Breakthrough provides a new concept of the design of molecular motors, sensors and electricity generators at nanoscale
Researchers from the Institute of Organic Chemistry and Biochemistry of the CAS (IOCB Prague), Institute of Physics of the CAS (IP CAS) and Palacký University...
15.02.2018 | Event News
13.02.2018 | Event News
12.02.2018 | Event News
23.02.2018 | Physics and Astronomy
23.02.2018 | Health and Medicine
23.02.2018 | Physics and Astronomy