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1. A thermodynamically consistent physics-informed deep learning material model for short fiber/polymer nanocomposites

Author

Bahtiri, Betim, Arash, Behrouz, Scheffler, Sven, Jux, Maximilian, and Rolfes, Raimund

Subjects
Computer Science - Machine Learning, Computer Science - Artificial Intelligence, Computer Science - Computational Engineering, Finance, and Science, Mathematics - Numerical Analysis
Abstract

This work proposes a physics-informed deep learning (PIDL)-based constitutive model for investigating the viscoelastic-viscoplastic behavior of short fiber-reinforced nanoparticle-filled epoxies under various ambient conditions. The deep-learning model is trained to enforce thermodynamic principles, leading to a thermodynamically consistent constitutive model. To accomplish this, a long short-term memory network is combined with a feed-forward neural network to predict internal variables required for characterizing the internal dissipation of the nanocomposite materials. In addition, another feed-forward neural network is used to indicate the free-energy function, which enables defining the thermodynamic state of the entire system. The PIDL model is initially developed for the three-dimensional case by generating synthetic data from a classical constitutive model. The model is then trained by extracting the data directly from cyclic loading-unloading experimental tests. Numerical examples show that the PIDL model can accurately predict the mechanical behavior of epoxy-based nanocomposites for different volume fractions of fibers and nanoparticles under various hygrothermal conditions., Comment: arXiv admin note: text overlap with arXiv:2305.08102

Published
2024

2. A machine learning-based viscoelastic-viscoplastic model for epoxy nanocomposites with moisture content

Author

Bahtiri, Betim, Arash, Behrouz, Scheffler, Sven, Jux, Maximilian, and Rolfes, Raimund

Subjects
Computer Science - Machine Learning, Computer Science - Computational Engineering, Finance, and Science
Abstract

In this work, we propose a deep learning (DL)-based constitutive model for investigating the cyclic viscoelastic-viscoplastic-damage behavior of nanoparticle/epoxy nanocomposites with moisture content. For this, a long short-term memory network is trained using a combined framework of a sampling technique and a perturbation method. The training framework, along with the training data generated by an experimentally validated viscoelastic-viscoplastic model, enables the DL model to accurately capture the rate-dependent stress-strain relationship and consistent tangent moduli. In addition, the DL-based constitutive model is implemented into finite element analysis. Finite element simulations are performed to study the effect of load rate and moisture content on the force-displacement response of nanoparticle/ epoxy samples. Numerical examples show that the computational efficiency of the DL model depends on the loading condition and is significantly higher than the conventional constitutive model. Furthermore, comparing numerical results and experimental data demonstrates good agreement with different nanoparticle and moisture contents., Comment: The source codes of the finite element analysis in this work are available at https://github.com/BBahtiri/viscoelastic_viscoplastic_model

Published
2023
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3. Management of anterior cruciate ligament revision in adults: the 2022 ESSKA consensus part III—indications for different clinical scenarios using the RAND/UCLA appropriateness method

Author

Tischer, Thomas, Andriolo, Luca, Beaufils, Philippe, Ahmad, Sufian S., Bait, Corrado, Bonomo, Marco, Cavaignac, Etienne, Cristiani, Riccardo, Feucht, Matthias J., Fiodorovas, Markas, Grassi, Alberto, Helmerhorst, Gijs, Hoser, Christian, Karahan, Mustafa, Komnos, George, Lagae, Koen Carl, Madonna, Vincenzo, Monaco, Edoardo, Monllau, Juan Carlos, Ollivier, Matthieu, Ovaska, Mikko, Petersen, Wolf, Piontek, Tomasz, Robinson, James, Samuelsson, Kristian, Scheffler, Sven, Sonnery-Cottet, Bertrand, Filardo, Giuseppe, and Condello, Vincenzo

Published
2023
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4. Management after acute injury of the anterior cruciate ligament (ACL), part 2: management of the ACL-injured patient

Author

Petersen, Wolf, Häner, Martin, Guenther, Daniel, Lutz, Patricia, Imhoff, Andreas, Herbort, Mirco, Stein, Thomas, Schoepp, Christian, Akoto, Ralph, Höher, Jürgen, Scheffler, Sven, Stöhr, Amelie, Stoffels, Thomas, Mehl, Julian, Jung, Tobias, Eberle, Christian, Vernacchia, Cara, Ellermann, Andree, Krause, Matthias, Mengis, Natalie, Müller, Peter E., Best, Raymond, and Achtnich, Andrea

Published
2023
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5. Management after acute rupture of the anterior cruciate ligament (ACL). Part 1: ACL reconstruction has a protective effect on secondary meniscus and cartilage lesions

Author

Petersen, Wolf, Guenther, Daniel, Imhoff, Andreas B., Herbort, Mirco, Stein, Thomas, Schoepp, Christian, Akoto, Ralph, Höher, Jürgen, Scheffler, Sven, Stoehr, Amelie, Stoffels, Thomas, Häner, Martin, Hees, Tilman, Mehl, Julian, Ellermann, Andree, Krause, Matthias, Mengis, Natalie, Eberle, Christian, Müller, Peter E., Best, Raymond, Lutz, Patricia M., and Achtnich, Andrea

Published
2023
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10. Handlungsalgorithmus: Therapie der akuten Ruptur des vorderen Kreuzbands

Author

Petersen, Wolf, Stein, Thomas, Günther, Daniel, Schoepp, Christian, Ellermann, Andree, Best, Raymond, Höher, Jürgen, Imhoff, Andreas, Lutz, Patricia, Eberle, Christian, Häner, Martin, Herbort, Mirco, Stoffels, Thomas, Jung, Tobias, Scheffler, Sven, Mehl, Julian, Stöhr, Amelie, Mengis, Natalie, Akoto, Ralph, and Achtnich, Andrea

Published
2021
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11. Management after acute injury of the anterior cruciate ligament (ACL). Part 3: Recommendation on surgical treatment

Author

Häner, Martin, primary, Stoffels, Thomas, additional, Guenther, Daniel, additional, Pfeiffer, Thomas, additional, Imhoff, Andreas, additional, Herbort, Mirco, additional, Stein, Thomas, additional, Schoepp, Christian, additional, Akoto, Ralph, additional, Höher, Jürgen, additional, Scheffler, Sven, additional, Stöhr, Amelie, additional, Mehl, Julian, additional, Niederer, Daniel, additional, Jung, Tobias, additional, Kittl, Christoph, additional, Eberle, Christian, additional, Vernacchia, Cara, additional, Ellermann, Andree, additional, Braun, Philipp‐Johannes, additional, Krause, Matthias, additional, Mengis, Natalie, additional, Müller, Peter E., additional, Best, Raymond, additional, Achtnich, Andrea, additional, and Petersen, Wolf, additional

Published
2024
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18. Management of PCL Injuries (ICL 1)

Author

Margheritini, Fabrizio, La Prade, Robert, Scheffler, Sven, Becker, Roland, editor, Kerkhoffs, Gino M.M.J., editor, E. Gelber, Pablo, editor, Denti, Matteo, editor, and Seil, Romain, editor

Published
2016
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26. Graft Harvest and Preparation

Author

Monllau, Juan Carlos, Petersen, Wolf, Fink, Christian, Scheffler, Sven U., Gelber, Pablo Eduardo, Hoser, Christian, Siebold, Rainer, editor, Dejour, David, editor, and Zaffagnini, Stefano, editor

Published
2014
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30. List of Contributors

Author

Ahmad, Sufian S., primary, Akita, Keiichi, additional, Alvarez, Pedro, additional, Amis, Andrew A., additional, Andrews, James R., additional, Anz, Adam W., additional, Ares, Oscar, additional, Argentieri, Erin C., additional, Avbelj, Viktor, additional, Balazs, George C., additional, Barber, F. Alan, additional, Barber-Westin, Sue D., additional, Bareka, Metaxia, additional, Barnthouse, Cris D., additional, Barrett, Austin M., additional, Barrett, Gene R., additional, Basdekis, George, additional, Beck, Charles L., additional, Bedi, Asheesh, additional, Benner, Rodney W., additional, Bernard, Manfred, additional, Bernholt, David L., additional, Beynnon, Bruce D., additional, Bisson, Leslie J., additional, Björnsson, Haukur, additional, Blagojevic´, Zoran, additional, Bogunovic, Ljiljana, additional, Briggs, Karen, additional, Brophy, Robert, additional, Brotherton, Scott L., additional, Brown, Charles H., additional, Brown, Taylor D., additional, Browne, Jon E., additional, Chahla, Jorge, additional, Chau, Jackie Yee-Man, additional, Chan, William Wai-Lam, additional, Chisholm, Mary F., additional, Cole, Brian J., additional, Collins, Amber T., additional, Collins, Malcolm, additional, Crossley, Kay M., additional, Cugat, Ramón, additional, Cuscó, Xavier, additional, DeBerardino, Thomas M., additional, Denaro, Vincenzo, additional, Dreese, James C., additional, Dukas, Alex G., additional, Duthon, Victoria B., additional, Ejerhed, Lars, additional, Ernest, Christian, additional, Evangelopoulos, Dimitrios S., additional, Everhart, Joshua S., additional, Fabricant, Peter D., additional, Feller, Julian A., additional, Fideler, Kathryn, additional, Filbay, Stephanie R., additional, Finkle, Susan M., additional, Flanigan, David C., additional, Francisco, Ramces, additional, Frank, Rachel M., additional, Fromm, Stuart E., additional, Fu, Freddie H., additional, Fulkerson, John P., additional, Ganapathy, Pramodh K., additional, Ganley, Theodore J., additional, Garrett, William E., additional, Georgoulis, Anastasios, additional, Gill, Thomas J., additional, Gornitzky, Alex L., additional, Goyeneche, Nicholas P., additional, Gray, Tinker, additional, Griffin, Letha Y., additional, Griffith, Chad J., additional, Gobbi, Alberto, additional, Guenther, Daniel, additional, Hackel, Joshua G., additional, Hadjicostas, Panayiotis T., additional, Han, Yung, additional, Hantes, Michael E., additional, Harlem, Thomas, additional, Harris, Joshua D., additional, Hecker, Aaron, additional, Ho, Sherwin S.W., additional, Howell, Stephen M., additional, Hutchinson, Mark R., additional, Imbert, Pierre, additional, Indelicato, Peter A., additional, Inderhaug, Eivind, additional, Irarrázaval, Sebastián, additional, Janssen, Daan Martijn, additional, Janssen, Rob P.A., additional, Järvelä, Timo, additional, Javernick, Matt, additional, Jiang, Jie, additional, Johnson, Darren L., additional, Johnson, Don, additional, Joyce, Brian T., additional, Jung, Min, additional, Kaeding, Christopher C., additional, Kalawadia, Jay V., additional, Kamath, Ganesh, additional, Karistinos, Anastassios, additional, Karlsson, Jón, additional, Karnatzikos, Georgios, additional, Kartus, Jüri, additional, Keating, John, additional, Kennedy, Nicholas I., additional, Kercher, James, additional, Khan, Umar, additional, Kim, Walter, additional, Kluczynski, Melissa A., additional, Koh, Jason L., additional, Kohl, Sandro, additional, Kousa, Petteri, additional, LaPrade, Christopher M., additional, LaPrade, Robert F., additional, Laupattarakasem, Pat, additional, Laupattarakasem, Wiroon, additional, Lawhorn, Keith W., additional, Leong, Natalie L., additional, Loveland, Dustin M., additional, Lynch, T. Sean, additional, Mackay, Gordon, additional, Maffuli, Nicola, additional, Magnussen, Robert A., additional, Maloney, Mike, additional, Mandelbaum, Bert R., additional, Mardam-Bey, Sami W., additional, Marx, Robert G., additional, McAllister, David R., additional, McCarty, Eric, additional, McCullough, Kirk A., additional, Menon, Sanjay, additional, Meuffels, Duncan E., additional, Metzler, Adam V., additional, Michaelson, Jefferey, additional, Mijic, Dragomir, additional, Milano, Giuseppe, additional, Milisavljevic´, Milan, additional, Mithoefer, Kai, additional, Mlynarek, Ryan A., additional, Mochizuki, Tomoyuki, additional, Mohankumar, Rakesh, additional, Moraiti, Constantina, additional, Moran, Ray, additional, Moulton, Samuel G., additional, Mudhigere, Abhishek, additional, Muneta, Takeshi, additional, Murphy, Brian J., additional, Nakamura, Norimasa, additional, Naraghi, Ali M., additional, Nicandri, Gregg, additional, Nikolic´, Valentina, additional, Noyes, Frank R., additional, Nurmi, Janne T., additional, O’Byrne, John, additional, Ochi, Mitsuo, additional, Paessler, Hans Heinrich, additional, Pandit, Hemant, additional, Papalia, Rocco, additional, Pappas, Evangelos, additional, Paschos, Nikolaos K., additional, Patzakis, Michael J., additional, Paulos, Lonnie E., additional, Peterson, Lars, additional, Philippon, Marc J., additional, Poage, Chad H., additional, Posthumus, Michael, additional, Prodromos, Chadwick C., additional, Rashkovska, Aleksandra, additional, Reijman, Max, additional, Rennicke, Jordan C., additional, Ristanis, Stavros, additional, Rius, Marta, additional, Rogowski, Julie, additional, Rossi, Nicholas, additional, Rue, John-Paul, additional, Saccomanno, Maristella F., additional, Sallent, Andrea, additional, Sasaki, Norihiro, additional, Sayde, William M., additional, Scheffler, Sven, additional, Schlatterer, Bernard, additional, Schmitt, Laura C., additional, Schoenfeldt, Ted, additional, Seijas, Roberto, additional, September, Alison V., additional, Shaarani, Shahril R., additional, Shaikh, Humza S., additional, Shaw, Christopher M., additional, Shelbourne, K. Donald, additional, Shelton, Walter, additional, Shin, Jason J., additional, Shino, Konsei, additional, Silvers, Holly J., additional, Simeoforidou, Marina, additional, Sims, Laura A., additional, Sklar, Joseph H., additional, Smith, Angela H., additional, Smyth, Mark P., additional, Sommerfeldt, Mark F., additional, Spindler, Kurt P., additional, Steiner, Mark E., additional, Stergiou, Nicholas, additional, Stevanovic´, Vladan, additional, Tecame, Andrea, additional, Tejwani, Samir G., additional, Terzidis, Ioannis, additional, Thoma, Louise, additional, Tilton, Annemarie K., additional, Timmerman, Laura A., additional, Tohyama, Harukazu, additional, Tsarouhas, Alexander, additional, Tsepis, Elias, additional, Trobec, Roman, additional, Lee Turnbull, Travis, additional, Uribe, John W., additional, van Meer, Belle L., additional, van Mourik, Jan B.A., additional, Van Thiel, Geoffrey, additional, Varkey, Dax, additional, Vasta, Sebastiano, additional, Veselko, Matjaž, additional, Wade, Sean M., additional, Wall, Andrew, additional, Ware, James Kristopher, additional, Waterman, Brian R., additional, Webster, Kate E., additional, Westermann, Robert W., additional, Wolf, Brian R., additional, Wright, Rick W., additional, Xergia, Sofia A., additional, Xerogeanes, John William, additional, Yanke, Adam, additional, Yasuda, Kazunori, additional, Yi, Seung Jin, additional, Zalavras, Charalampos G., additional, Zampeli, Franceska, additional, Zarins, Bertram, additional, and Zhao, Jinzhong, additional

Published
2018
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31. Protocol for a Randomized Crossover Trial to Evaluate the Effect of Soft Brace and Rigid Orthosis on Performance and Readiness to Return to Sport Six Months Post-ACL-Reconstruction

Author

Jahnke, Sonja, primary, Cruysen, Caren, additional, Prill, Robert, additional, Kittmann, Fabian, additional, Pflug, Nicola, additional, Albert, Justin Amadeus, additional, de Camargo, Tibor, additional, Arnrich, Bert, additional, Królikowska, Aleksandra, additional, Kołcz, Anna, additional, Reichert, Paweł, additional, Oleksy, Łukasz, additional, Michel, Sven, additional, Kopf, Sebastian, additional, Wagner, Michael, additional, Scheffler, Sven, additional, and Becker, Roland, additional

Published
2023
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32. Management after acute injury of the anterior cruciate ligament (ACL), part 2: management of the ACL-injured patient

Author

Petersen, Wolf, primary, Häner, Martin, additional, Guenther, Daniel, additional, Lutz, Patricia, additional, Imhoff, Andreas, additional, Herbort, Mirco, additional, Stein, Thomas, additional, Schoepp, Christian, additional, Akoto, Ralph, additional, Höher, Jürgen, additional, Scheffler, Sven, additional, Stöhr, Amelie, additional, Stoffels, Thomas, additional, Mehl, Julian, additional, Jung, Tobias, additional, Eberle, Christian, additional, Vernacchia, Cara, additional, Ellermann, Andree, additional, Krause, Matthias, additional, Mengis, Natalie, additional, Müller, Peter E., additional, Best, Raymond, additional, and Achtnich, Andrea, additional

Published
2022
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33. Anatomy – Biomechanics – Novel Imaging of the Native PCL

Author

Van Hoof, Tom, Cromheecke, Michiel, Tampere, Thomas, D’herde, Katharina, Victor, Jan, Verdonk, Peter C. M., Menetrey, Jacques, Scheffler, Sven, Djian, Patrick, Makridis, Konstantinos G., Margheritini, Fabrizio, Menetrey, Jacques, editor, Zaffagnini, Stefano, editor, Fritschy, Daniel, editor, and van Dijk, Niek, editor

Published
2012
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34. Adressen

Author

Rixen, Dieter, primary, Schoepp, Christian, additional, Tingart, Markus, additional, Akoto, Ralph, additional, Angele, Peter, additional, Balcarek, Peter, additional, Balke, Maurice, additional, Bäthis, H., additional, Betsch, Marcel, additional, Bouillon, Bertil, additional, Ellwein, Alexander, additional, Frosch, Karl-Heinz, additional, Glombitza, Martin, additional, Götz, J., additional, Grützner, Paul Alfred, additional, Heitmann, Maximilian, additional, Hoffmann, Reinhard, additional, Höher, Jürgen, additional, Höntzsch, Dankward, additional, Kirschner, Stephan, additional, Kohlhof, Hendrik, additional, Lenze, Florian, additional, Lenze, Ulrich, additional, Lill, Helmut, additional, Lohmann, Ch. H., additional, Lüring, Christian, additional, Müller-Rath, Ralf, additional, Niemeyer, Philipp, additional, Petersen, Wolf, additional, Pichl, Johann, additional, Pohlig, Florian, additional, Prescher, Andreas, additional, Rath, Björn, additional, Röpke, Martin, additional, Salmoukas, Katharina, additional, Scheffler, Sven, additional, Schröter, Frank, additional, Shafizadeh, Sven, additional, Stengel, Dirk, additional, Stöckle, Ulrich, additional, Südkamp, Norbert P., additional, Vetter, Sven, additional, von Eisenhart-Rothe, Rüdiger, additional, Wirtz, Dieter Christian, additional, and Zellner, Johannes, additional

Published
2017
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36. Tibial Slope on Conventional Lateral Radiographs in Anterior Cruciate Ligament–Injured and Intact Knees: Mean Value and Outliers.

Author

Weiler, Andreas, Berndt, Rosa, Wagner, Michael, Scheffler, Sven, Schatka, Imke, and Gwinner, Clemens

Subjects
KNEE radiography, REFERENCE values, RESEARCH evaluation, CROSS-sectional method, ANTHROPOMETRY, MULTIVARIATE analysis, RETROSPECTIVE studies, INTER-observer reliability, T-test (Statistics), COMPARATIVE studies, ANTERIOR cruciate ligament injuries, INTRACLASS correlation, DESCRIPTIVE statistics, TIBIA, DATA analysis software
Abstract

Background: An increased tibial slope (TS) has been identified as a risk factor for anterior cruciate ligament (ACL) injury and graft failure after ACL reconstruction. However, different imaging modalities are used to determine the TS, resulting in divergent values. Consequently, no reference values and no consensus on thresholds can be reached, which in turn is mandatory for indicating correction osteotomies when facing outlier TS. Purpose: To determine the mean values of the TS and the incidence of their outliers in large cohorts of patients with ACL-injured and noninjured knees and to determine the feasibility of measuring TS on conventional lateral radiographs (CLRs). Study Design: Cross-sectional study; Level of evidence 3. Methods: TS of ACL-injured knees (n = 1000, group A) and ACL-intact knees (n = 1000, group B) was measured by 3 experienced examiners. Medial TS was measured on CLRs using the technique of Dejour and Bonnin. Patients with radiographs with poor image quality, osteoarthritis, previous osteotomies, or nondigital radiographs were excluded. The intra- and interrater reliability was calculated using the intraclass correlation coefficient. Results: The mean TS was significantly higher in group A than in group B (10.04°± 3° [range, 2°-22°] vs 9.02°± 2.9° [range, 1°-18°], respectively; P <.001). Significantly more participants in group A had TS larger than 12° (≥12°, 32.2% vs 19.8%, P <.001; ≥13°, 20.9% vs 11.1%, P <.001; ≥14°, 13.5% vs 5.7%, P <.001; ≥15°, 8% vs 2.7%, P <.001; ≥16°, 3.7% vs 1.4%, P =.0005), respectively. In contrast, significantly more participatns in group B had TS 8° or less (≤8°, 32.1% vs 42.7%, P <.001; ≤7°, 20% vs 30.9%, P <.001; ≤6°, 12.4% vs 19.8%, P <.001; ≤5°, 6.6% vs 12%, P =.0003; ≤4°, 2.8% vs 5.3%, P =.0045). The intraclass correlation coefficient revealed a good to excellent reliability throughout measurements. Conclusion: Median values for the TS were 9° for uninjured and 10° for ACL-injured knees on CLRs. Notwithstanding its statistical significance, this finding might be negligible in clinical practice. However, a significantly larger number of outliers were found in the ACL-injured group exceeding a TS of 12° and demonstrating an incremental proportion with increasing TS, serving as a potential threshold for correction osteotomy. Furthermore, CLRs in the largest cohort to date exhibited high reproducibility, proving the feasibility of CLRs as a routine measurement for TS. [ABSTRACT FROM AUTHOR]

Published
2023
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39. Die Flugzeuge von morgen : Energieeffizientes und nachhaltiges Fliegen

Author

Seume, Jörg, Dinkelacker, Friedrich, Hanke-Rauschenbach, Richard, Mertens, Axel, Ponick, Bernd, Blechschmidt, Dominik, Rolfes, Raimund, Friebe, Jens, Gronau, Steven, Mimic, Dajan, Scheffler, Sven, Seume, Jörg, Dinkelacker, Friedrich, Hanke-Rauschenbach, Richard, Mertens, Axel, Ponick, Bernd, Blechschmidt, Dominik, Rolfes, Raimund, Friebe, Jens, Gronau, Steven, Mimic, Dajan, and Scheffler, Sven

Abstract

[no abstract available]

Published
2022

40. Management after acute rupture of the anterior cruciate ligament (ACL). Part 1: ACL reconstruction has a protective effect on secondary meniscus and cartilage lesions

Author

Petersen, Wolf, primary, Guenther, Daniel, additional, Imhoff, Andreas B., additional, Herbort, Mirco, additional, Stein, Thomas, additional, Schoepp, Christian, additional, Akoto, Ralph, additional, Höher, Jürgen, additional, Scheffler, Sven, additional, Stoehr, Amelie, additional, Stoffels, Thomas, additional, Häner, Martin, additional, Hees, Tilman, additional, Mehl, Julian, additional, Ellermann, Andree, additional, Krause, Matthias, additional, Mengis, Natalie, additional, Eberle, Christian, additional, Müller, Peter E., additional, Best, Raymond, additional, Lutz, Patricia M., additional, and Achtnich, Andrea, additional

Published
2022
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41. The Suction Panel - xHLFC and Structural Solution for Energy Efficient Aviation

Author

Wiedemann, Martin, Badrya, Camli, Prasannakumar, Adarsh, Lobitz, Lennart, Traub, Hendrik, Heimbs, Sebastian, Bülow, Christian, Sämann, Philipp, Hühne, Christian, Scheffler, Sven, Brod, Martin, and Tariq, Muzzamil

Subjects
Aerodynamics, Thin Plies, Design, Suction Panel, Hybrid Laminar Flow Control, Stress, 3D-Printing, Fatigue
Published
2021

43. The Suction Panel - xHLFC and Structural Solution for Energy Efficient Aviation

Author

Wiedemann, Martin, primary, Badrya, Camil, additional, Prasannakumar, Adarsh, additional, Lobitz, Lennart, additional, Traub, Hendrik, additional, Heimbs, Sebastian, additional, Hühne, Christian, additional, Saemann, Philipp, additional, Buelow, Christian, additional, Scheffler, Sven, additional, Brod, Martin, additional, and Tariq, Muzzamil, additional

Published
2022
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45. Treatment of Combined Injuries to the ACL and the MCL Complex: A Consensus Statement of the Ligament Injury Committee of the German Knee Society (DKG)

Author

Guenther, Daniel, primary, Pfeiffer, Thomas, additional, Petersen, Wolf, additional, Imhoff, Andreas, additional, Herbort, Mirco, additional, Achtnich, Andrea, additional, Stein, Thomas, additional, Kittl, Christoph, additional, Schoepp, Christian, additional, Akoto, Ralph, additional, Höher, Jürgen, additional, Scheffler, Sven, additional, Stöhr, Amelie, additional, Stoffels, Thomas, additional, Mehl, Julian, additional, Jung, Tobias, additional, Ellermann, Andree, additional, Eberle, Christian, additional, Vernacchia, Cara, additional, Lutz, Patricia, additional, Krause, Matthias, additional, Mengis, Natalie, additional, Müller, Peter E., additional, Patt, Thomas, additional, and Best, Raymond, additional

Published
2021
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48. A comprehensive finite element framework for the progressive damage analysis of fiber metal laminate bolted joints under static and cyclic loading: theory and experimental validation

Author

Rolfes, Raimund, Hematipour, Maryam, Englisch, Nils, Scheffler, Sven, Fraunhofer Institut für Windenergiesysteme, Institut für Statik und Dynamik (Leibniz Universität Hannover), Gerendt, Christian, Rolfes, Raimund, Hematipour, Maryam, Englisch, Nils, Scheffler, Sven, Fraunhofer Institut für Windenergiesysteme, Institut für Statik und Dynamik (Leibniz Universität Hannover), and Gerendt, Christian

Abstract

To improve the robustness of fiber-reinforced plastics (FRP) in bolted joints, local metal-hybridization of the FRP laminate can be performed to obtain an FRP-based fiber metal laminate (FML) of increased bearing strength. This contribution presents the first modeling framework able to predict the entire fatigue degradation process of such FRP-based FML bolted joints from damage initiation until ultimate failure, including the safety-relevant bolted joint failure mode. For this purpose, each laminate constituent material (i.e. metallic inlays and FRP plies) is analyzed by an own physically motivated continuum damage model. To predict the fatigue crack initiation and growth in the metallic inlays, the framework deploys a newly developed continuum damage approach, which uses a cyclic elasto-plastic strain energy increment as primary fatigue metric. Based on its constitutive equations, the inlay damage model is able to predict a fatigue crack’s location and growth direction, both in the low- and the high-cycle fatigue regime. To account for the fatigue damage of the FRP plies, an energy-based fatigue damage approach for FRP composites, recently presented and validated by the authors, is applied. A comprehensive damage assessment is achieved as both fatigue models are accompanied by respective static damage models. The algorithms are implemented as one user-material (UMAT) subroutine in the commercial finite element software ABAQUS/Implicit. After the separate validation of the inlay damage model, the FML damage modeling framework is validated for open hole tension and T-bolt joint setups.

Published
2021

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