Hirsekorn, S., Rabe, U., Bruche, D., Maurer, J., Arnold, W., Grov, N., ...
In automotive engineering die-casting components from non-ferrous metals are increasingly used as safety parts, which to a 100% have to be tested non-destructively. Additionally, for cost-efficient...
Excitation of atomic force microscope cantilever vibrations by a Schottky barrier (2008)
Schwarz, K., Rabe, U., Hirsekorn, S., Arnold, W.
We have developed a method to excite cantilever vibrations for dynamic force microscopy. A n-doped silicon cantilever is coated by platinum. At the interface, a Schottky barrier forms whose depletion...
Kumar, A., Rabe, U., Hirsekorn, S., Arnold, W.
We determined the isotropic indentation modulus of precipitates in cubic materials by using the indentation modulus of the matrix as a reference. This eliminates major practical difficulty of...
Excitation of atomic force microscope cantilever vibrations by a Schottky barrier (2008)
Schwarz, K., Rabe, U., Hirsekorn, S., Arnold, W.
We have developed a method to excite cantilever vibrations for dynamic force microscopy. A n-doped silicon cantilever is coated by platinum. At the interface, a Schottky barrier forms whose depletion...
Kumar, A., Rabe, U., Hirsekorn, S., Arnold, W.
We determined the isotropic indentation modulus of precipitates in cubic materials by using the indentation modulus of the matrix as a reference. This eliminates major practical difficulty of...
Influence of the cantilever holder on the vibrations of AFM cantilevers (2007)
Rabe, U., Hirsekorn, S., Reinstädtler, M., Sulzbach, T., Lehrer, C., Arnold, W.
Dynamic techniques exploiting the vibration of atomic force microscope (AFM) cantilevers are often superior to quasi-static operation, in particular with respect to the signal-to-noise ratio. Tapping...
Porositätsprüfung von NE-Metall-Druckguss durch Hochfrequenzultraschall (2007)
Hirsekorn, S., Rabe, U., Bruche, D., Grov, N., Kinzler, T., Arnold, W.
Ein großer Teil der Druckgusserzeugnisse aus Nichteisenmetallen, wie z. B. aus Aluminium-, Kupfer-, Magnesium- und Zinkbasislegierungen, wird im Automobilbau eingesetzt. Immer mehr dieser...
High-frequency ultrasonic porosity testing of non-ferrous metal die-casting components (2007)
Hirsekorn, S., Rabe, U., Bruche, D., Arnold, W., Grov, N., Kinzler, T.
With the described measurements and theoretical estimations we have shown that ultrasonic backscattering is well suited to detect porosity and single pores in the near-surface range (0.5 to 2 mm...
Towards a top-down approach in materials science (2007)
Materials science or, more specifically, materials characterization represents an extremely vast interdisciplinary research arena involving scientists with very different backgrounds working at many...
Experiments on diverse materials, such as e.g. rocks, soil, cement, concrete, and damaged metals, have revealed evidence for nonlinearity, hysteresis, and discrete memory in their elastic behaviour....
Hirsekorn, S., Hirsekorn, M., Delsanto, P.P.
Adhesive bonds in composite structures influence the mechanical behavior of components and limit their load capacity. Consequently, the investigation of the interaction forces in adhesive joints is...
Nonlinear contact resonance spectroscopy in atomic force microscopy (2007)
Rupp, D., Rabe, U., Hirsekorn, S., Arnold, W.
There are several techniques which combine atomic force microscopy with ultrasonics. In atomic force acoustic microscopy the cantilever is forced to ultrasonic vibrations while the tip is in contact...
Rabe, U., Arnold, W., Caron, A., Hirsekorn, S., Schwarz, K.
The combination of ultrasound with atomic force microscopy (AFM) opens the high lateral resolution of scanning probe echniques to ultrasonics. Atomic force acoustic microscopy (AFAM) and lateral...
Hirsekorn, S., Rabe, U., Arnold, W.
The research work on Nonlinear Elastic Wave Spectroscopy (NEWS) of this contribution is focused on nonlinear ultrasonic transmission through damaged composite laminates for quality assessment. The...
Verfahren zur Messung der akustischen Impedanz einer Fluessigkeit (2005)
WO2004111629 A UPAB: 20050126 NOVELTY - Method for measuring the acoustic impedance of a liquid has the following steps: insertion of an ultrasonic transducer (1) in the liquid (2), measurement of...
Hirsekorn, S., Kurzenhäuser, S., Koka, A., Arnold, W.
Samples consisting of aluminum plates joined together by thin epoxy adhesive layers are investigated by nonlinear ultrasonic transmission measurements. In order to allow both ultrasonic transmission...
Koka, A., Kurzenhäuser, S., Hirsekorn, S., Hunke, R., Schlimmer, M., Arnold, W., ...
Defects such as voids, cracks, delaminations, and so-called kissing bonds may influence the mechanical load capacity of adhesive joints. The purpose of this paper is two-fold. On the one hand it...
The universality of nonclassical nonlinearity and applications to NDE (2005)
Delsanto, P., Hirsekorn, S., Pastrone, F.
In the field of Materials Science many patterns have emerged which are remarkably similar although they refer to completely different phenomenologies. This is hardly surprising, since often the...
Measurement and evaluation of nonlinear ultrasonic transmission on adhesive bonds (2005)
Hirsekorn, S., Haffner, R., Gebhardt, W., Arnold, W.
The experimental and theoretical research work on Nonlinear Elastic Wave Spectroscopy (NEWS) at IZFP is, so far, focused to investigations of nonlinear ultrasonic transmission through bonded...
Hirsekorn, S., Koka, A., Kurzenhäuser, S., Arnold, W.
Interfaces in bonded structures significantly influence the mechanical behavior of components and often limit their load capacity. This requires nondestructive testing techniques allowing one to...
Atomic force microscopy at ultrasonic frequencies (2005)
Arnold, W., Caron, A., Hirsekorn, S., Kopycinska-Müller, M., Rabe, U., Reinstädtler, M.
The AFAM and ultrasonic piezo-mode techniques described here lend itself for studying materials properties in ceramics on a nanoscale. Whereas the various imaging modes become more and more routine,...
Arnold, W., Hirsekorn, S., Koka, A., Schlimmer, M., Hunke, R.
Ziel des Forschungsvorhabens war, eine zuverlässige und robuste Methode zur zerstörungsfreien Detektion von Kebverbindungsfehlern mit Ultraschall zu entwickeln und die Auswirkung dieser Fehler auf...
Koka, A., Hirsekorn, S., Kurzenhäuser, S., Arnold, W., Häberle, J., Hunke, R., ...
Das Kleben gewinnt in vielen Bereichen der Technik an Bedeutung. Die Beanspruchbarkeit von Klebungen wird maßgeblich durch fertigungsbedingte, örtliche Fehler wie Luftblasen, Porositäten, Risse,...
Ultrasonic modes in atomic force microscopy (2004)
Kopycinska-Müller, M., Reinstädtler, M., Rabe, U., Caron, A., Hirsekorn, S., Arnold, W.
Atomic Force Acoustic Microscopy (AFAM) and Lateral Atomic Force Acoustic Microscopy (LAFAM) are dynamic enhancements of the Atomic Force Microscope (AFM). They combine the high lateral resolution of...
Arnold, W., Hirsekorn, S., Kopycinska-Müller, M., Reinstädtler, M., Rabe, U.
In Atomic Force Acoustic Microscopy (AFAM) the cantilever is vibrating in one of its resonance frequencies while the sensor tip remains in contact with the sample surface. The elastic constant which...
Recent experiments on rocks and other materials, such as soil, cement, concrete and damaged elastic materials, have led to the discovery of nonlinear hysteretic effects in their elastic behaviour....
On the universality of nonclassical nonlinear phenomena and their classification (2004)
Recent discoveries of nonclassical nonlinear effects in materials have suggested the existence of a nonlinear mesoscopic elasticity (NME) universality class. In the present contribution, we go beyond...
Koka, A., Hirsekorn, S., Kurzenhäuser, S., Arnold, W., Häberle, J., Hunke, R., ...
Das Kleben gewinnt in vielen Bereichen der Technik an Bedeutung. Die Beanspruchbarkeit von Klebungen wird maßgeblich durch fertigungsbedingte, örtliche Fehler wie Luftblasen, Porositäten, Risse,...
Spectral analysis of a PM space in the simulation of nonlinear ultrasonic wave propagation (2003)
Various models have been proposed for the simulation of classical and nonclassical effects on the propagation of ultrasonic waves in nonlinear mesoscopic elastic materials. They usually assume the...
Hirsekorn, S., Koka, A., Arnold, W.
Nonlinear stress-strain relations of adhesive bonds cause a nonlinear modulation of ultrasonic waves in reflection as well as in transmission provided sufficiently high strain amplitudes can be...
Nonlinear effects in the propagation of ultrasonic waves through thin interfaces (2003)
Delsanto, P., Camagna, C., Hirsekorn, M., Hirsekorn, S.
We simulate numerically the propagation of a monochromatic ultrasonic wave through an adhesive epoxy interface between two homogeneous aluminium slabs, under the assumption of classical nonlinearity....
Kopycinska-Müller, M., Rabe, U., Hirsekorn, S., Ziebert, C., Schmitt, H., Arnold, W.
Atomic Force Acoustic Microscope and ultrasonic piezo-mode have been applied in order to investigate the influence of the local polarization on the elastic and the piezoelectric properties of...
Kopycinska, M., Ziebert, C., Schmitt, H., Rabe, U., Hirsekorn, S., Arnold, W.
In this study the influence of the annealing conditions on the surface morphology and the elastic and piezoelectric properties of thin-film lead calcium titanate samples were investigated with...
Vorrichtung zum Untersuchen von Grenzflaechenbereichen mit Ultraschall (2003)
The examination device has at least one transmitter (5) for providing ultrasound signals of variable amplitude directed onto the boundary surface (14) and a cooperating receiver (17) for receiving a...
Hirsekorn, S., Kopycinska-Müller, M., Rabe, U., Reinstädtler, M., Caron, A., Arnold, W.
In Atomic Force Microscopy the deflection and torsion of micro-fabricated elastic beams with a sensor tip are used to generate high-resolution images of sample surfaces. In dynamic modes, the...
Rabe, U., Kopycinska, M., Hirsekorn, S., Munoz Saldana, J., Schneider, G., Arnold, W.
The local elastic properties and the ferroelectric domain configuration of piezoelectric ceramics have been examined by atomic force acoustic microscopy and by ultrasonic piezoelectric force...
Imaging of the ferroelectric domains pattern in the ultrasonic piezo-mode (2002)
Kopycinska, M., Rabe, U., Hirsekorn, S., Arnold, W.
The Atomic Force Acoustic Microscope technique (AFAM) has been applied in order to investigate the elastic properties of different types of materials. With this technique it is possible to resolve...
Flexural vibration behavior of piezoelectric heterogeneous bimorph beams (2002)
Bending oscillations of piezoelectric bimorph beams are effective sound sources in gases or fluids and therefore of practical interest. On the basis of the piezoelectric constitutive relations and...
Delsanto, P., Hirsekorn, S., Aostini, V., Loparco, R., Koka, A.
An important task in nondestructive materials evaluation is the development of techniques to characterize the bond quality of adherent joints. Binding forces are nonlinear and cause a nonlinear...
Rabe, U., Kopycinska, M., Hirsekorn, S., Arnold, W.
The combination of ultrasound with atomic force microscopy (AFM) opens the high lateral resolution of scanning probe techniques in the nanometer range to ultrasonics. One possible method is to...
Atomic force microscopy at ultrasonic frequencies (2002)
Arnold, W., Hirsekorn, S., Kopycinska, M., Rabe, U., Reinstädtler, M., Scherer, V.
Dynamic Atomic Force Microscopy (AFM) modes, where the cantilever is vibrated while the sample surface or tip is scanned, belong to the standard features of most commercial instruments. With these...
Rabe, U., Amelio, S., Kopycinska, M., Hirsekorn, S., Kempf, M., Göken, M., ...
In atomic force acoustic microscopy (AFAM) the cantilever of an atomic force microscope (AFM) is vibrated at ultrasonic frequencies while a sample surface is scanned with the sensor tip contacting...
Quality Assessment of Bonded Interfaces by Nonlinear Ultrasonic Techniques (2001)
The load capacity of composite materials is often limited by the quality of the bonded interfaces. Therefore, an important task in nondestructive materials testing is the development of techniques to...
Ultrasonic radiation in dynamic force microscopy (2001)
Hirsekorn, S., Rabe, U., Arnold, W.
In dynamic force microscopy the cantilever of an atomic force microscope is vibrated at ultrasonic frequencies in the range of several 10 kHz up to several MHz while scanning a sample surface....
Atomic Force Microscopy at Ultrasonic Frequencies (2001)
Arnold, W., Hirsekorn, S., Kopycinska, M., Rabe, U.
In Atomic Force Microscopy (AFM) deflection of a microfabricated elastic beam with a sensor tip at its end is used to generate high-resolution images of surfaces. Dynamic modes, where the cantilever...
Hochauflösende Abbildung von Oberflächensteifigkeiten mittels Ultraschall-Kraftmikroskopie (2001)
Rabe, U., Amelio, S., Hirsekorn, S., Arnold, W.
Unter Ultraschall-Kraftmikroskopie (AFAM für "Atomic Force Acoustic Microscopy") versteht man Techniken, bei denen Ultraschallwellen in der Probe und in der mikroskopischen Blattfeder des...
Detektion und Bewertung von Schädigungen in Stahl mit Ultraschall (2001)
Hirsekorn, S., Netzelmann, U., Arnold, W.
Streu- und Diffusionstheorien, die die Ultraschallausbreitung in Werkstoffen mit mikroskopischen Inhomogenitäten beschreiben und Zusammenhänge zwischen den Ultraschallausbreitungsparametern und...
Nonlinear Transfer of Ultrasound by Adhesive Joints - a Theoretical Description (2001)
Quality assessment of bond interface in composite materials in an important task in nondestructive material testing. Techniques to characterize or even measure the bond strength are required. In...
Hochauflösende Abbildung von Oberflächensteifigkeiten mittels Ultraschall-Kraftmikroskopie (2001)
Rabe, U., Amelio, S., Hirsekorn, S., Arnold, W.
Unter Ultraschall-Kraftmikroskopie (AFAM für "Atomic Force Acoustic Microscopy") versteht man Techniken, bei denen Ultraschallwellen in der Probe und in der mikroskopischen Blattfeder des...
Detektion und Bewertung von Schädigungen in Stahl mit Ultraschall (2001)
Hirsekorn, S., Netzelmann, U., Arnold, W.
Streu- und Diffusionstheorien, die die Ultraschallausbreitung in Werkstoffen mit mikroskopischen Inhomogenitäten beschreiben und Zusammenhänge zwischen den Ultraschallausbreitungsparametern und...
Imaging of ferroelectric domains by atomic force aoustic microscopy (2000)
Rabe, U., Amelio, S., Hirsekorn, S., Arnold, W.
Atomic Force Microscopy (AFM) is a near-field technique to generate high-resolution images of surfaces. A microfabricated elastic beam with an integrated sharp sensor tip at its end is scanned over...
Quantitative contact spectroscopy by atomic force acoustic microscopy (2000)
Amelio, S., Rabe, U., Kester, E., Hirsekorn, S., Arnold, W.
The evaluation of the cantilever vibration spectra at ultrasonic frequencies in an AFM is presented in order to descern local elastic data quantitatively. In imaging, our technique allows e. g. to...
Arnold, W., Amelio, S., Hirsekorn, S., Kopycinska, M., Rabe, U.
In Atomic Force Microscopy (AFM) deflection of a micro-fabricated elastic beam with a sensor tip at ist end is used to generate high-resolution images of surfaces. Dynamic modes, where the cantilever...
Quality Assessment of Bond Interfaces by Nonlinear Ultrasonics Transmission (2000)
Hirsekorn, S., Koka, A., Wegner, A., Arnold, W.
Quality assessment of bond interfaces in composite materials is an important task in non-destructive materials testing. Techniques to characterize or even measure the bond strength are required....
Nondestructive Characterization of PZT Materials for Sensor and Actuator Applications (2000)
Scherer, V., Hirsekorn, S., Rabe, U., Arnold, W.
The conventional ultrasonic time-of-flight technique is employed showing that the sound propagation in a poled piezoelectric ceramic is anisotropic. The sound velocity depends on three directions,...
Assessment of the Adhesion Quality of Fusion-Welded Silicon Wafers with Nonlinear Ultrasound (2000)
Wegner, A., Koka, A., Janser, K., Netzelmann, U., Hirsekorn, S., Arnold, W.
Diffusion bonded silicon wafers are employed in the semiconductor industry. Their bonding quality must be monitored by a nondestructive testing technique. We present an ultrasonic technique allowing...
Quantitative Contact Spectroscopy and Imaging by Atomic-Force Acoustic Microscopy (2000)
Arnold, W., Amelio, S., Hirsekorn, S., Rabe, U.
Atomic Force Acoustic Microscopy is a near-field technique which combines the ability in using ultrasonics to image elastic properties with the high lateral resolution of scanning probe microscopes....
Quantitative Determination of Contact Stiffness Using Atomic Force Acoustic Microscopy (2000)
Rabe, U., Amelio, S., Kester, E., Scherer, V., Hirsekorn, S., Arnold, W.
Atomic force acoustic microscopy is a near-field technique which combines the ability of ultrasonics to image elastic properties with the high lateral resolution of scanning probe microscopes. We...
Ultrasonic Methods to Detect and Evaluate Damage in Steel (2000)
Hirsekorn, S., Andel, P.W. Van, Netzelmann, U.
Porosity, microcracks, or secondary phase inclusions alter the sound velocities of materials. Ultrasonic scattering at grain and phase boundaries in polycrystalline, multi-phase, or porous media...
Zerstörungsfreie Mikrocharakterisierung multifunktioneller Werkstoffe (1999)
Scherer, V., Hirsekorn, S., Rabe, U., Arnold, W.
Im Rahmen des Schwerpunktprogramms "Wechselbeziehung zwischen elektronischen und mechanischen Eigenschaften keramischer Multifunktionswerkstoffe" der DFG wurden zerstörungsfreie Methoden...
On the Contrast in Eddy Current Microscopy using Atomic Force Microscopes (1999)
Hirsekorn, S., Rabe, U., Boub, A., Arnold, W.
A magnetic probe of an atomic force microscope oscillating above a sample induces eddy currents within conducting materials. The resulting electrodynamic interaction between sample and probe...
Hirsekorn, S., Gebhardt, W., Arnold, W.
Die für die Dickenschwingungen verantwortlichen Materialparameter eines 1-3-Piezokomposits können, wenn die laterale Inhomogenität des Materials klein ist im Vergleich zu angeregten...
Modeling of Graded 1-3 Composite Piezoelectric Transducers (1999)
Hirsekorn, S., Gebhardt, E., Arnold, W.
A simple physical model of 1-3 piezoelectric composites can be used to determine the material properties that are relevant to thickness-mode oscillations. If the lateral scale of the composite is...
Quantitative evaluation of acoustic AFM images to determine elastic, anelastic, and adhesive surface properties require the theoretical description and calculation of the transfer of mechanical...
High-Resolution Materials Characterization by Conventional and Near-Field Acoustic Microscopy (1998)
Acoustic microscopy not only allows imaging of sample surfaces with high spatial resolution but also can be exploited to determine quantively surface properties. The scanning acoustic microscope...
Hirsekorn, S., Fassbender, S., Arnold, W., Wegner, A.
Die Beurteilung der Belastbarkeit von Fügeschichten in Materialverbunden ist eine wichtige Aufgabe in der zerstörungsfreien Werkstoffprüfung. gefragt sind Verfahren zur Messung der Haftfestigkeit...
Nanomechanical Surface Characterization by Atomic Force Acoustic Microscopy (1997)
Arnold, W., Hirsekorn, S., Rabe, U., Scherer, V.
We constructed an atomic force acoustic microscope that enables one to detect out-of-plane and in-plane sample surface vibrations in a wide frequency range from about 100 kHz to several MHz. From the...
Microscopic methods for micro materials characterization (1997)
Hirsekorn, S., Rabe, U., Fassbender, S., Scherer, V., Arnold, W.