A5017160596- Non-Destructive Testing Techniques
- Magnetic Properties and Applications
- Microstructure and Mechanical Properties of Steels
- Thermography and Photoacoustic Techniques
- Ultrasonics and Acoustic Wave Propagation
- Material Properties and Failure Mechanisms
- Terahertz technology and applications
- Magnetic Properties of Alloys
- Welding Techniques and Residual Stresses
- Concrete Corrosion and Durability
- Fatigue and fracture mechanics
- Insect and Arachnid Ecology and Behavior
- Hydrogen embrittlement and corrosion behaviors in metals
- Nuclear Physics and Applications
- Wood Treatment and Properties
- Structural Health Monitoring Techniques
- Fusion materials and technologies
- Induction Heating and Inverter Technology
- Metallurgical and Alloy Processes
- Structural Engineering and Materials Analysis
- Geophysical Methods and Applications
- Millimeter-Wave Propagation and Modeling
- High Temperature Alloys and Creep
- Civil and Structural Engineering Research
- Forensic Fingerprint Detection Methods
Fraunhofer Institute for Nondestructive Testing
2003-2021
Walter de Gruyter (Germany)
2020
Fraunhofer Society
2003-2013
Landeszentrum Gesundheit Nordrhein-Westfalen
2004
In this paper, terahertz time-domain spectroscopy (THz-TDS) is used for the first time to detect fabricated defects in a glass fiber-skinned lightweight honeycomb composite panel. A novel amplitude polynomial regression (APR) algorithm proposed as preprocessing method. This method segments amplitude-frequency curves simulate heating and cooling monotonic behavior infrared thermography. Then, of empirical orthogonal function (EOF) imaging applied on APR preprocessed data postprocessing...
Micromagnetic materials characterization requires sensors which essentially consist of two critical elements: an electromagnet introduces a well-defined magnetic field to the material, and sensor system detects material's response applied field. The devices developed at Fraunhofer IZFP obtain multiparametric "magnetic fingerprint" with these by means several methods. fingerprints calibration samples are used as input for pattern recognition or regression analysis, thus allowing prediction...
Abstract Electromagnetic properties are an interesting means for monitoring a variety of materials' mechanical in ferro‐ and paramagnetic materials non‐destructively. Those include uni‐ und multi‐axial stress states as well plasticity fatigue damage can be measured at macro‐ microscopic scales, depending on what measurement equipment will used. The article describes the general electromagnetic phenomena to considered used before presenting different experimental results from which mentioned...
As an emerging nondestructive diagnostic and monitoring technique, terahertz time-domain spectroscopy (THz-TDS) imagery is attracting more attention. In this regard, new THz image processing algorithms based on infrared thermography (IRT) concepts are greatly needed, since most IRT modalities fast for in-line industrial inspection. However, scenario difficult due to some physical constraints be reached, although idea should followed avoid the loss of useful information during processing....
The embrittlement of two types nuclear pressure vessel steel, 15Kh2NMFA and A508 Cl.2, was studied using different methods magnetic nondestructive testing: micromagnetic multiparameter microstructure stress analysis (3MA-X8) adaptive testing (MAT). mechanical properties reactor (RPV) materials are modified due to neutron irradiation; this material degradation can be characterized methods. For the first time, progressive change in irradiation investigated on same specimens, before after...
Abstract Micromagnetic materials characterization is a nondestructive means of predicting mechanical properties and stress steel iron products. The method based on the circumstance that both magnetic behaviour relate to microstructure over similar interaction mechanisms, which leads characteristic correlations between ferromagnetic materials. prediction or from micromagnetic parameters represents an inverse problem commonly addressed by regression classification approaches. Challenges for...
Prestressed constructions have been extensively used since the 1950s for infrastructure and large-span constructions. During maintenance renovation after events causing damages, it is often important to know current stress on prestressed steel elements of structure, such as strands or cables. Limited access can be provided. Then a nondestructive assessment possible. However, several points taken into account before micromagnetic ultrasound testing methods determining value. For both methods,...
In several magnetic Non-Destructive Testing (NDT) methods, the local measurement of field inside material is required. Moreover, looking at difficult part geometries, sensors have to be small enough in order reach measuring position. The most-used are coils, Hall-effect sensors, flux gates and magnetoresistive sensors. However, regarding industrial application, those often packaged cannot placed close
Zusammenfassung Die mikromagnetischen zerstörungsfreien Prüfverfahren bedienen sich der gegenseitigen Abhängigkeit magnetischen und mechanischen Eigenschaften ferromagnetischer Werkstoffe. Änderungen in Härte, Zugfestigkeit Streckgrenze, aber auch Last- Eigenspannungen schlagen von Merkmalen Hysteresekurve nieder (beispielsweise Koerzitivfeldstärke, Remanenz Permeabilität). direkte Bestimmung Hysterese ist Praxis auf klassische Weise jedoch meist nicht möglich, teilweise aufgrund hohen...
With an increasing number of power plants operated in excess their original design service life early recognition critical material degradation components will gain importance. Many years reactor safety research allowed for the identification and development electromagnetic NDE methods which detect precursors imminent damage with high sensitivity, at elevated temperatures a radiation environment. Regarding low-alloy heat-resistant steel grade WB 36 (1.6368, 15NiCuMoNb5), effects thermal...
The need for an accelerated development of new materials and surfaces raises expectations in lateral homogeneity quantitative exactness the characteristic material properties. interest is focused on microstructure characterization, detection micro-imperfections evaluation local distribution residual stresses, mechanical hardness coating thickness. These requirements meet with high-resolution NDT methods such as Barkhausen Noise Eddy Current MIcroscopy (BEMI) at IZFP. BEMI enables locally...
From the beginning of building techniques creating pre-stressed and accordingly post-tensioned concrete structures until late 1980ies manufacturers construction companies dealt with pre-stressing steel material vulnerable to stress corrosion cracking. Almost every load-bearing structure requires regular inspection on a mandatory basis. Due knowledge structural reinforcement susceptible cracking being used during or visible damage alongside tendon area arises demand for detailed investigation...