Numerische Modellierung zur Auslegung der Mehrkreismagnetisierung bei der Magnetpulverprüfung (1991)
Emson, C., Betzold, K., Goebbels, K.
Die Modellierung der Prüfobjekte und der Magnetisierungskreise bei der Magnetpulverprüfung mit 3-dimensionalen Finite-Elemente-Programmen liefert die Feldstärke und die Flußdichte an der...
Temperature dependence of third order elastic constants (1990)
Mohrbacher, H., Goebbels, K., Schneider, E.
Second and third order elastic constants are needed to describe the influence of stress or strain states on the ultrasonic velocities. In order to apply ultrasonic techniques for the evaluation of...
Ultrasonic attenuation measurement using backscattering technique (1989)
Ultrasonic backscattering measurements by means of spatial averaging technique were carried out in steel to determine the ultrasonic attenuation coefficient. The attenuation coefficients were...
Rosenfelder, O., Arnold, W., Goebbels, K., Reiter, H.
Es wurden verschiedene zerstörungsfreie Prüfmethoden vorgestellt, die zur Untersuchung von keramischen Bauteilen eingesetzt werden können. Die Anwendbarkeit dieser Verfahren zum Nachweis von...
NDT for small defects by x-ray tomography. (1988)
Goebbels, K., Hirsekorn, S., Maisl, M., Reiter, H., Vontz, T.
Computer tomography (CT), originally developed for medical purposes is becoming increasingly applied to nondestructive testing. The main reason for this is its ability to produce shadow free, high...
An insufficient cover-thickness of concrete is the main reason for corrosion of steel-reinforcements in civil engineering. The volume enlargement of the corroded steel produces at the concrete...
Characterization of hardening depth by Barkhausen noise measurement (1988)
Bach, G., Goebbels, K., Theiner, W.A.
Materials and components undergo the highest loads at their surfaces. To withstand mechanical loads, many methods are in use to increase surface and near-surface hardness. Conventional hardness and...
Bei einem Verfahren zur Bestimmung der Dichte und der Module des Materials eines Bauteils wird zunaechst die Geschwindigkeit von Longitudinalwellen im Material des Bauteils erfasst. Auf eine...
Non-destructive evaluation of ceramic components for engines (1986)
Advanced ceramics have several advantages which make them important materials for structural applications: low density, high strength and hardness, low heat expansion and good heat conductivity...
Coarse-grained materials - nondestructive evaluation (1986)
Advanced ceramics have several advantages which make them important materials for structural applications: low density, high strength and hardness, low heat expansion and good heat conductivity...
Zerstörungsfreie Prüfung von Fügestellen an keramischen Werkstoffen und Bauteilen (1985)
Arnold, W., Goebbels, K., Reiter, H.
The use of different materials in a component requires special bonding technigues. The tolerable defect size is smaller for brittle ceramic materials than for metals in which mechanical stress around...
Zerstörungsfreie Prüfung keramischer Motoren- und Turbinenbauteile (1985)
Die Entwicklung sonderkeramischer Werkstoffe wie SiC und Si3N4 ist innerhalb des letzten Jahrzehnts im Rahmen der Arbeiten zu einer keramischen Gasturbine vorangetrieben worden. Mit der Verbesserung...
Zerstörungsfreie Analyse der Gefüge- und Spannungszustände in metallischen Werkstoffen (1985)
Die Eignung von Werkstoffen, Beanspruchungen zu ertragen, hängt von den Werkstoffeigenschaften ab. Diese wiederum stehen in einer Multi-Parameter-Abhängigkeit zu den Gefügeparametern. Es wird ein...
Stress determination in textured polycrystals using ultrasonic technique (1985)
Goebbels, K., Hirsekorn, S., Pitsch, H., Schneider, E.
The well-known method of stress determination in macroscopically isotropic polycrystals using ultrasonic birefringence is generalized for application to textured materials. The technique is based...
Scattering of ultrasonic waves in anisotropic polycrystalline. (1985)
Guo, C.B., Goebbels, K., Höller, P.
It has been shown experimentally, that the scattered amplitudes of the ultrasonic waves in anisotropic polycrystalline metals decay with time in accordance with t high minus 3/4 e high minus Alpha...
Nondestructive detection and analysis of stress states with polarized ultrasonic waves (1985)
Goebbels, K., Hirsekorn, S., Pitsch, H., Schneider, E.
THE APPLICATION of linear polarized shear waves is especially recommended in order to determine the (residual) stress states in structural elements. This technique results in equations for the stress...
The use of ultrasound in the determination of microstructure (1984)
Goebbels, K., Hirsekorn, S., Willems, H.
Microstructure and defects are determining the ability of materials to be used in components and to withstand applied loads. The contribution describes the state of the art to characterize the...
Characterisation de la structure des materiaux polycristallins par retrodiffusion ultrasonore (1982)
Determination of residual stresses by birefringence of polarized ultrasonic shear waves (1980)
Schneider, E., Goebbels, K., Huebschen, G., Salzburger, H.J.
Hochfrequenz-Ultraschall. Zerstoerungsfreie Analyse von Werkstoffgefuegen (1978)
Kapitza, H., Kraus, S., Schneider, E., Zimmermann, W., Goebbels, K., Reiter, H.