Publications

• Journal Articles
• Book chapters
• Conference papers
• Other publications

Journal Articles

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2024

• Geist, Hannes, Balle, Frank
  A circularity engineering focused empirical status quo analysis of automotive remanufacturing processes
  2024 Resources, conservation and recycling, Elsevier BV, volume: 201, page: 107328
• Premanand, Aravind, Rienks, Michael, Balle, Frank
  Accelerated estimation of the very high cycle fatigue strength and life of polymer composites under ultrasonic cyclic three-point bending
  2024 Materials and design, Elsevier Science, volume: 240, page: 112872
• Ragupathi, Balaji, Balle, Frank
  Characterization of glass-fiber reinforced thermoplastic composite after ultrasonic reconsolidation
  2024 European journal of materials, Taylor & Francis Group, volume: 4, issue: 1, page: 2313316
• Rehra, Jan, Jungbluth, Julia, Katri, Bilal, Schmeer, Sebastian, Gurka, Martin
  Damage and failure mechanisms of hybrid carbon fiber and steel fiber reinforced polymer composites
  2024 Composites, Elsevier, volume: 185, page: 108366
• Premanand, Aravind, Rienks, Michael, Balle, Frank
  Damage assessment during ultrasonic fatigue testing of a CF-PEKK composite using self-heating phenomenon
  2024 International fournal of fatigue, Elsevier BV, volume: 180, page: 108084
• Premanand, Aravind, Balle, Frank
  Influence of pulse duration on the fatigue behavior of a carbon-fiber-reinforced composite under cyclic three-point bending at 20 kHz
  2024 Fatigue & fracture of engineering materials & structures, Wiley-Blackwell, volume: 47, issue: 5, page: 1731-1747
• Premanand, Aravind, Prescher, Mario, Rienks, Michael, Kirste, Lutz, Balle, Frank
  Online and ex situ damage characterization techniques for fiber-reinforced composites under ultrasonic cyclic three-point bending
  2024 Polymers, MDPI AG, volume: 16, issue: 6, page: 803
• Ragupathi, Balaji, Jakkula, Puneeth, Rienks, Michael, Balle, Frank
  Online monitoring of pre-crack initiation in carbon fiber-reinforced thermoplastic composites by an ultrasonic cutting tool using high-speed optical imaging and infrared thermography
  2024 Ultrasonics, Elsevier, volume: 143, page: 107411
• Geist, Hannes, Balle, Frank
  Remanufactured products, components, and their materials: A circularity engineering focused empirical status quo analysis
  2024 Sustainable production and consumption, Elsevier BV, volume: 45, page: 525-537

2023

• Li, Junqi, Rienks, Michael, Balle, Frank
  Development of a high-frequency test system to study the wear of ultrasonic welding tools
  2023 Metals, MDPI AG, volume: 13, issue: 12, page: 1935
• Premanand, Aravind, Rogala, Tomasz, Wachla, Dominik, Amraei, Jafar, Katunin, Andrzej
  Fatigue strength estimation of a CF/PEKK composite through self-heating temperature analysis using cyclic bending tests at 20 kHz
  2023 Composites science and technology, Elsevier BV, volume: 243, page: 110218
• Ragupathi, Balaji, Bacher, Matthias Florian, Balle, Frank
  First efforts on recovery of thermoplastic composites at low temperatures by power ultrasonics
  2023 Cleaner materials, Elsevier, volume: 8, page: 100186
• Pfaff, Aron, Linnenberg, Markus, Hoschke, Klaus, Balle, Frank
  Generating functionally graded steel microstructures by laser powder bed fusion
  2023 Journal of materials science, Springer Science and Business Media LLC, volume: 58, page: 17383-17404
• Li, Junqi, Zillner, Johannes, Balle, Frank
  In-depth evaluation of ultrasonically welded Al/Cu joint: plastic deformation, microstructural evolution, and correlation with mechanical properties
  2023 Materials, MDPI AG, volume: 16, issue: 8, page: 3033
• Li, Junqi, Balle, Frank
  In-situ observation of the bond formation process during ultrasonic metal welding of Al/Cu joints using Laser Doppler Vibrometry
  2023 Journal of manufacturing processes, Elsevier BV, volume: 106, page: 1-11
• Pfaff, Aron, Schäffer, Sebastian, Jäcklein, Martin, Balle, Frank
  Measuring the cooling behavior of melt pools in L-PBF by pyrometry
  2023 Materials, MDPI, volume: 16, issue: 10, page: 3647
• Ragupathi, Balaji, Bacher, Matthias Florian, Balle, Frank
  Separation and reconsolidation of thermoplastic glass fiber composites by power ultrasonics
  2023 Resources, conservation and recycling, Elsevier, volume: 198, page: 107122
• Premanand, Aravind, Balle, Frank
  Stress and strain calculation method for orthotropic polymer composites under axial and bending ultrasonic fatigue loads
  2023 Ultrasonics, Elsevier BV, volume: 135, page: 107130
• Oliveira, Pablo Resende, Virgen, Georgina Paulina Gonzalez, Imbert, Mathieu, Beisel, Samuel, May, Michael
  Ultrasonically welded eco-friendly sandwich panels based on upcycled thermoplastic core: an eco-mechanical characterisation
  2023 Resources, conservation & recycling advances, Elsevier, volume: 20, page: 200187

2022

• Premanand, Aravind, Balle, Frank
  Development of an axial loading system for fatigue testing of textile-composites at ultrasonic frequencies
  2022 Materials letters: X, Elsevier BV, volume: 13, page: 100131
• Staab, Florian, Balle, Frank
  Fatigue and fracture of ultrasonically welded aluminum alloys to carbon fiber reinforced thermoplastics
  2022 Fatigue & fracture of engineering materials & structures, Wiley, volume: 45, issue: 2, page: 607-616
• Premanand, Aravind, Balle, Frank
  Influence of pulse–pause sequences on the self-heating behavior in continuous carbon fiber-reinforced composites under ultrasonic cyclic three-point bending loads
  2022 Materials, MDPI AG, volume: 15, issue: 10, page: 3527
• Imbert, Mathieu, Hahn, Philipp, Balle, Frank, May, Michael
  Mechanical laminae separation at room temperature as a high-quality recycling process for laminated composites
  2022 Materials letters, Elsevier, volume: 306, page: 130964
• Khatri, Bilal, Rehra, Jan, Schmeer, Sebastian, Breuer, Ulf Paul, Balle, Frank
  Metal/carbon-fiber hybrid composites - damage evolution and monitoring of isothermal fatigue at low and elevated temperatures
  2022 Journal of composites science, MDPI AG, volume: 6, issue: 3, page: 67
• Becker, Michael, Kuball, Alexander, Ghavimi, Amirhossein, Adam, Bastian, Busch, Ralf
  Solid state joining of a cold rolled zr-based bulk metallic glass to a wrought aluminum alloy by power ultrasonics
  2022 Materials, MDPI, volume: 15, issue: 21, page: 7673
• Khatri, Bilal, Roth, Manuel Francis, Balle, Frank
  Ultrasonic welding of additively manufactured PEEK and carbon-fiber-reinforced PEEK with integrated energy eirectors
  2022 Journal of manufacturing and materials processing, MDPI AG, volume: 7, issue: 1, page: 2

2021

• Staab, Florian, Prescher, Mario, Balle, Frank, Kirste, Lutz
  3D X-ray microscopy of ultrasonically welded aluminum/fiber-reinforced polymer hybrid joints
  2021 Materials, MDPI AG, volume: 14, issue: 7, page: 1784
• Becker, Michael, Balle, Frank
  Multi-spot ultrasonic welding of aluminum to steel sheets: process and fracture analysis
  2021 Metals, MDPI, volume: 11, issue: 5, page: 779
• Liesegang, Moritz, Arweiler, Sophie, Beck, Tilmann, Balle, Frank
  Orbital ultrasonic welding of Ti-fittings to CFRP-tubes
  2021 Journal of manufacturing and materials processing, MDPI AG, volume: 5, issue: 2, page: 30
• Liesegang, Moritz, Yu, Yuan, Beck, Tilmann, Balle, Frank
  Sonotrodes for ultrasonic welding of titanium/CFRP-joints - materials selection and design
  2021 Journal of manufacturing and materials processing, MDPI, volume: 5, issue: 2, page: 61

2020

• Pfaff, Aron, Jäcklein, Martin, Schlager, Max, Harwick, Wilfried, Hoschke, Klaus
  An empirical approach for the development of process parameters for laser powder bed fusion
  2020 Materials, MDPI AG, volume: 13, issue: 23, page: 5400
• Staab, Florian, Liesegang, Moritz, Balle, Frank
  Local shear strength distribution of ultrasonically welded hybrid Aluminium to CFRP joints
  2020 Composite Structures, Elsevier BV, volume: 248, page: 112481

2019

• Losch, Katharina, Schuff, Sebastian, Balle, Frank, Beck, Tilmann, Redenbach, Claudia
  A stochastic microstructure model for particle reinforced aluminium matrix composites
  2019 Journal of microscopy, Wiley-Blackwell, volume: 273, issue: 2, page: 115-126
• Huberth, Frank, Lienhard, Jörg, Ragupathi, Balaji, Hauber, Max
  Dynamic micro-testing over a large range of strain rates for homogenous and heterogeneous local material characterization
  2019 Materials and contact characterisation IX, WIT Press, volume: 124, page: 143-150
• Backe, Sebastian, Balle, Frank, Hannemann, Benedikt, Schmeer, Sebastian, Breuer, Ulf Paul
  Fatigue properties of multifunctional metal- and carbon-fibre-reinforced polymers and intrinsic capabilities for damage monitoring
  2019 Fatigue & fracture of engineering materials & structures, Wiley-Blackwell, volume: 42, issue: 1, page: 143-151
• Balle, Frank, Beck, Tilmann, Eifler, Dietmar, Fitschen, Jan Henrik, Schuff, Sebastian
  Strain analysis by a total generalized variation regularized optical flow model
  2019 Inverse problems in science and engineering, Taylor & Francis, volume: 27, issue: 4, page: 540-564
• Staab, Florian, Balle, Frank
  Ultrasonic torsion welding of ageing-resistant Al/CFRP joints: properties, microstructure and joint formation
  2019 Ultrasonics, Elsevier, volume: 93, page: 139-144

2018

• Balle, Frank, Backe, Sebastian, Becker, Michael, Liesegang, Moritz, Staab, Florian
  Alles wird leichter?! Potentiale und Herausforderungen hybrider Werkstoffsysteme
  2018 dIALOG Materialwissenschaft und Werkstofftechnik, Deutsche Gesellschaft für Materialkunde, issue: 1, page: 134-139
• Lionetto, Francesca, Mele, Claudio, Leo, Paola, D'Ostuni, Sonia, Balle, Frank
  Ultrasonic spot welding of carbon fiber reinforced epoxy composites to aluminum: mechanical and electrochemical characterization
  2018 Composites, Elsevier, volume: 144, page: 134-142

2017

• Lionetto, Francesca, Balle, Frank, Maffezzoli, Alfonso
  Hybrid ultrasonic spot welding of aluminum to carbon fiber reinforced epoxy composites
  2017 Journal of materials processing technology, Elsevier, volume: 247, page: 289-295
• Hannemann, Benedikt, Backe, Sebastian, Schmeer, Sebastian, Balle, Frank, Breuer, Ulf Paul
  Hybridisation of CFRP by the use of continuous metal fibres (MCFRP) for damage tolerant and electrically conductive lightweight structures
  2017 Composite structures, Elsevier, volume: 172, page: 374-382
• Loeber, Thomas Henning, Laegel, Bert, Wolff, Sandra, Schuff, Sebastian, Balle, Frank
  Reducing curtaining effects in FIB/SEM applications by a goniometer stage and an image processing method
  2017 Journal of vacuum science & technology, AIP Publishing, volume: 35, issue: 6
• Weibel, Dominic, Balle, Frank, Backe, Daniel
  Ultrasonic fatigue of CFRP - experimental principle, damage analysis and very high cycle fatigue properties
  2017 Key engineering materials, Trans Tech Publications Ltd., volume: 742, page: 621-628

2016

• Beck, Tilmann, Klein, Marcus, Smaga, Marek, Balle, Frank, Eifler, Dietmar
  Innovative Experimental Approaches and Physical Measurement Methods for Fatigue Monitoring and Life Assessment
  2016 Materials Science Forum, Trans Tech Publications, volume: 879, page: 205-210
• Hannemann, Benedikt, Backe, Sebastian, Schmeer, Sebastian, Balle, Frank, Breuer, Ulf Paul
  Metal fiber incorporation in carbon fiber reinforced polymers (CFRP) for improved electrical conductivity: Steigerung der elektrischen Leitfähigkeit von kohlenstofffaserverstärkten Kunststoffen (CFK) durch Integration von Metallfasern
  2016 Materialwissenschaft und Werkstofftechnik, Wiley, volume: 47, issue: 11, page: 1015-1023
• Backe, Daniel, Balle, Frank
  Ultrasonic fatigue and microstructural characterization of carbon fiber fabric reinforced polyphenylene sulfide in the very high cycle fatigue regime
  2016 Composites Science and Technology, Elsevier BV, volume: 126, page: 115-121

2015

• Backe, Daniel, Balle, Frank, Eifler, Dietmar
  Fatigue testing of CFRP in the Very High Cycle Fatigue (VHCF) regime at ultrasonic frequencies
  2015 Composites Science and Technology, Elsevier BV, volume: 106, page: 93-99
• Hannemann, Benedikt, Backe, Sebastian, Schmeer, Sebastian, Balle, Frank, Breuer, Ulf Paul
  New multifunctional hybrid polymer composites reinforced by carbon and steel fibers
  2015 20th international conference on composite materials (ICCM)
• Backe, Daniel, Balle, Frank, Eifler, Dietmar
  Three Point Bending Fatigue of Carbon Fiber Fabric Reinforced Polyphenylensulfide in the Very High Cycle Fatigue Regime
  2015 Key Engineering Materials, Trans Tech Publications, volume: 664, page: 47-54
• Balle, Frank, Magin, Jens
  Ultrasonic Spot and Torsion Welding of Aluminum to Titanium Alloys: Process, Properties and Interfacial Microstructure
  2015 Physics Procedia, Elsevier BV, volume: 70, page: 846-849

2014

• Magin, J., Balle, Frank
  Solid state joining of aluminum, titanium and their hybrids by ultrasonic torsion welding: Fügen von Aluminium, Titan und deren Mischverbunde durch Ultraschalltorsionsschweißen
  2014 Materialwissenschaft und Werkstofftechnik, Wiley, volume: 45, issue: 12, page: 1072-1083

2013

• Heinz, Stefan, Balle, Frank, Wagner, Guntram, Eifler, Dietmar
  Analysis of fatigue properties and failure mechanisms of Ti6Al4V in the very high cycle fatigue regime using ultrasonic technology and 3D laser scanning vibrometry
  2013 Ultrasonics, Elsevier BV, volume: 53, issue: 8, page: 1433-1440
• Schmeer, Sebastian, Balle, Frank, Didi, Mirja, Huxhold, Stefan, Wagner, Guntram
  Experimental and Computational Analysis of Multi-Spot Welded Hybrid Al/CFRP-Structures on Component Level: Experimental and Computational Analysis of Welded Hybrid Structures
  2013 Advanced Engineering Materials, Wiley, volume: 15, issue: 9, page: 868-873
• Schmeer, Sebastian, Balle, Frank, Didi, Mirja, Wagner, Guntram, Maier, Martin
  Experimental and Numerical Characterization of Spot Welded Hybrid Al/CFRP-Joints on Coupon Level: Characterization of Hybrid Joints on Coupon Level
  2013 Advanced Engineering Materials, Wiley, volume: 15, issue: 9, page: 853-860
• Balle, Frank, Emrich, Stefan, Wagner, Guntram, Eifler, Dietmar, Brodyanski, Alexander
  Improvement of Ultrasonically Welded Aluminum/Carbon Fiber Reinforced Polymer-Joints by Surface Technology and High Resolution Analysis: Improvement of Al/CFRP-Joints by Surface Technology
  2013 Advanced Engineering Materials, Wiley, volume: 15, issue: 9, page: 814-820
• Balle, Frank, Huxhold, Stefan, Emrich, Stefan, Wagner, Guntram, Kopnarski, Michael
  Influence of Heat Treatments on the Mechanical Properties of Ultrasonic Welded AA 2024/CF-PA66-Joints: Influence of Heat Treatments on the Mechanical Properties of …
  2013 Advanced Engineering Materials, Wiley, volume: 15, issue: 9, page: 837-845
• Konchakova, Natalia, Balle, Frank, Müller, Ralf, Steinmann, Paul, Eifler, Dietmar
  Numerical Analysis of the Mechanical Behavior of Lightweight Metal-CFRP Joints: Numerical Analysis of the Mechanical Behavior
  2013 Advanced Engineering Materials, Wiley, volume: 15, issue: 9, page: 846-852
• Konchakova, Natalia, Müller, Ralf, Steinmann, Paul, Balle, Frank, Eifler, Dietmar
  Simulation of Adhesive Joints by Viscoelastic Interface Material Model: Simulation of Adhesive Joints by Viscoelastic Interface…
  2013 Advanced Engineering Materials, Wiley, volume: 15, issue: 9, page: 861-867
• Balle, Frank, Eifler, Dietmar
  Special Topic: Welded Metal/CFRP-Structures
  2013 Advanced Engineering Materials, Wiley, volume: 15, issue: 9, page: 791-791
• Wagner, Guntram, Balle, Frank, Eifler, Dietmar
  Ultrasonic Welding of Aluminum Alloys to Fiber Reinforced Polymers: Ultrasonic Welding of Al/FRP-Joints
  2013 Advanced Engineering Materials, Wiley, volume: 15, issue: 9, page: 792-803

2012

• Heinz, Stefan, Balle, Frank, Wagner, Guntram, Eifler, Dietmar
  Innovative Ultrasonic Testing Facility for Fatigue Experiments in the VHCF Regime*
  2012 Materials Testing, Carl Hanser Verlag, volume: 54, issue: 11-12, page: 750-755
• Balle, Frank, Eifler, Dietmar
  Statistical test planning for ultrasonic welding of dissimilar materials using the example of aluminum-carbon fiber reinforced polymers (CFRP) joints
  2012 Materialwissenschaft und Werkstofftechnik, Wiley, volume: 43, issue: 4, page: 286-292
• Wagner, Guntram, Balle, Frank, Eifler, Dietmar
  Ultrasonic Welding of Hybrid Joints
  2012 JOM, Springer Nature, volume: 64, issue: 3, page: 401-406

2011

• Balle, Frank, Huxhold, Stefan, Wagner, Guntram, Eifler, Dietmar
  Damage Monitoring of Ultrasonically Welded Aluminum/ CFRP-Joints by Electrical Resistance Measurements
  2011 Procedia Engineering, Elsevier BV, volume: 10, page: 433-438
• Balle, Frank, Schmeer, Sebastian, Wagner, Guntram
  Mechanische Charakterisierung ultraschallgeschweißter Aluminium/CFK-Verbunde bei automobilrelevanten Temperaturen und Prüfgeschwindigkeiten: Den Herren Prof. Dr.-Ing. habil. Dietmar Eifler und Prof. Dr.-Ing. Martin Maier anlässlich ihres 60. Geburtstages gewidmet.
  2011 Materials Testing, Carl Hanser Verlag, volume: 53, issue: 1-2, page: 7-13

2010

• Balle, Frank, Wagner, Guntram, Eifler, Dietmar
  Combined process of ultrasonic welding and precipitation hardening of aluminum alloy 2024/carbon fibre reinforced composites structures
  2010 12th International Conference on Aluminum Alloys, volume: 12, page: 5 - 9
• Konchakova, Natalia, Balle, Frank, Barth, Franz-Josef, Mueller, R., Eifler, Dietmar
  Finite element analysis of an inelastic interface in ultrasonic welded metal/fibre-reinforced polymer joints
  2010 Computational Materials Science, Elsevier BV, volume: 50, issue: 1, page: 184-190

2009

• Balle, Frank, Wagner, Guntram, Eifler, Dietmar
  Joining of Aluminum 5754 Alloy to carbon fiber reinforced polymers (CFRP) by ultrasonic welding
  2009 Aluminum Alloys, volume: II, page: 191 - 196
• Balle, Frank, Wagner, Guntram, Eifler, Dietmar
  Ultrasonic Metal Welding of Aluminium Sheets to Carbon Fibre Reinforced Thermoplastic Composites
  2009 Advanced Engineering Materials, Wiley, volume: 11, issue: 1-2, page: 35-39

2008

• Balle, Frank, Emrich, Stefan, Wagner, Guntram, Eifler, Dietmar
  Fügen artfremder Werkstoffe — Ultraschallschweißen von Kohlenstofffasertextilien mit Metallen: Herrn Prof. Dr.-Ing. Erwin Roeder zur Vollendung seines 80. Lebensjahres gewidmet
  2008 Materials Testing, Carl Hanser Verlag, volume: 50, issue: 4, page: 184-189

2007

• Balle, Frank, Wagner, Guntram, Eifler, Dietmar
  Ultrasonic spot welding of aluminum sheet/carbon fiber reinforced polymer – joints
  2007 Materialwissenschaft und Werkstofftechnik, Wiley, volume: 38, issue: 11, page: 934-938

Book chapters

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2018

• Balle, Frank, Backe, Daniel
  Very high cycle fatigue of carbon fiber reinforced polyphenylene sulfide at ultrasonic frequencies
  2018, ,

2015

• Balle, Frank, Eifler, Dietmar, Fitschen, Jan Henrik, Schuff, Sebastian, Steidl, Gabriele
  Computation and Visualization of Local Deformation for Multiphase Metallic Materials by Infimal Convolution of TV-Type Functionals
  2015, Lecture Notes in Computer Science, Springer International Publishing, page: 385-396, Springer International Publishing,
• Backe, Daniel, Balle, Frank, Eifler, Dietmar
  Microstructural Characterization of Fatigue Damage of CFRP in the Very High Cycle Fatigue Regime
  2015, ,

2012

• Huxhold, Stefan, Balle, Frank, Wagner, Guntram, Eifler, Dietmar
  Fatigue Behavior and Damage Monitoring of Ultrasonic Welded Hybrid Joints
  2012, ,
• Backe, Daniel, Balle, Frank, Helfen, Thomas, Rabe, Ute, Hirsekorn, S.
  Ultrasonic Fatigue Testing System Combined with Online Nondestructive Testing for Carbon Fiber Reinforced Composites
  2012, ,
• Heinz, Stefan, Balle, Frank, Wagner, Guntram, Eifler, Dietmar
  Ultrasonic Fatigue of Ti6Al4V in the Very High Cycle Fatigue Regime
  2012, ,

2011

• Konchakova, Natalia, Müller, Ralf, Barth, Franz-Josef, Balle, Frank, Eifler, Dietmar
  Damage Evolution in Ultrasonic Welded Aluminum/Fiber-Reinforced Polymer Joints with Different Welding Geometries
  2011, ,
• Huxhold, Stefan, Balle, Frank, Wagner, Guntram, Eifler, Dietmar
  Ultrasonic Welding of Hybrid Aluminum/CFRP-Joints: Microstructure, Monotonic Properties and Fatigue Behavior
  2011, ,

2009

• Balle, Frank, Wagner, Guntram, Eifler, Dietmar
  Ultraschallschweißen– Ein innovatives Fügeverfahren für hybride Leichtbaustrukturen aus Metall/CFK-Verbunden
  2009, ,

Conference papers

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2024

• Neubrand, Achim, Findeisen, Claudio, Rohrmüller, Benedikt, Beckmann, Carla, Balle, Frank
  Effects of aging on the mechanical properties of CFRP and its impact on re-use and recycling
  2024
• Strahringer, Simeon, Imbert, Mathieu, Balle, Frank
  Impact-induced delamination: a new process to transform thermoplastic composite production offcuts into reusable single-layer patches
  2024

2021

• Huberth, Frank, Ragupathi, Balaji, Scheffler, Christian, Psyk, Verena, Preußner, Johannes
  Local microscopic and integral macroscopic analysis of magnetic pulse welds and deformations for dissimilar metal joints
  2021

2012

• Rabe, Ute, Helfen, Thomas, Weikert, Miriam, Hirsekorn, Sigrun, Herrmann, Hans-Georg
  Nonlinear ultrasonic testing of carbon fibre reinforced plastics in the very high cycle fatigue regime
  2012 Proceedings of Meetings on Acoustics, volume: 16, issue: 1, page: - - -

Other publications

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2021

• Premanand, Aravind, Balle, Frank
  Development of ultrasonic fatigue system for testing hybrid materials
  , 2021
• Becker, Michael, Balle, Frank
  Einfluss der Probenfixierung beim Ultraschallfügen von Aluminium/Stahl-Verbunden
  , 2021
• Balle, Frank, Khatri, Bilal
  Hybrid multifunctional composites (MCFRP): Metal and carbon fibers united!
  , 2021