@inproceedings{KuehhornGolze, author = {K{\"u}hhorn, Arnold and Golze, Mark}, title = {An Improved Sandwich Theory for a Better Prediction of the Wrinkling Phenomenon}, series = {Proceedings of the Fifth World Congress on Computational Mechanics, Vienna, Austria, July 7 - 12, 2002, held at Vienna University of Technology}, booktitle = {Proceedings of the Fifth World Congress on Computational Mechanics, Vienna, Austria, July 7 - 12, 2002, held at Vienna University of Technology}, address = {Vienna}, isbn = {3-9501554-0-6}, abstract = {An advanced design of sandwichstructures does not only require the knowledge of the global stress- and deformation behavior, but also the knowledge of the local effects, such as load singularities and the loss of stability caused by the short wave wrinkling of one (bending) or both (pressure) sandwich skins.Based on the nonlinear theory for sandwich shells with seven kinematic degrees of freedom, introduced from K{\"u}hhorn and Schoop an improved theory for plane sandwich shells with eight degrees of freedom will be presented, enabling a much better representation of the sandwich core behavior.Due to consideration of quadratic core thickness and linear core shear strain as well as longitudinal core deformation an improved prediction of the wrinkling behavior is succeeded even for thick cores and thin skins.The kinematic quantities as well as the nonlinear-differential equations and the simplified equations of first order theory resulting from them are given.Finally applying the well known classical problems of stability loaded by pressure and bending, the efficiency of this 8 DOF-theory ist demonstrated. A comparison with a detailed finite element (plain strain) calculation shows the high quality of these results.The presented sandwich theory characterized by eight degrees of freedom enables the calculation of nearly all essential sandwich phenomena even for thick cores.}, language = {en} } @article{KuehhornBeirowGolzeetal., author = {K{\"u}hhorn, Arnold and Beirow, Bernd and Golze, Mark and Studener, Johannes}, title = {Strukturmechanische Analyse einer Triebwerksverdichter-Schaufelscheibe}, abstract = {Die Verbesserung von Kalibriermethoden f{\"u}r Hochdruckverdichterstufen in ausgef{\"u}hrter Integralbauweise verlangt von den Ingenieuren ein detaillierteres Verst{\"a}ndnis der strukturdynamischen Zusammenh{\"a}nge dieses komplexen Bauteils. Als Ausgangsbasis werden zun{\"a}chst f{\"u}r das perfekte Normdesign bei Ausnutzung der vorliegenden zyklischen Rotationssymmetrie numerische Ergebnisse vorgestellt. Dabei stehen bez{\"u}glich des Schwingverhaltens die Kopplungseffekte zwischen Scheibe und Schaufeln im Mittelpunkt, wobei experimentelle Untersu-chungen am realen Bauteil erg{\"a}nzend hinzugezogen werden. Zuk{\"u}nftig wird in einem weiteren Schritt im Rahmen erheblich aufwendigerer Berechnungen mit der Ber{\"u}cksichtigung von Imperfektionen hinsichtlich der filigranen Schaufeln die Rotationssymmetrie aufgegeben und somit die Basis f{\"u}r eine gezielte Beeinflussung des Schwingverhaltens infolge von Mistuning - Effekten geschaffen.}, language = {de} } @inproceedings{KuehhornGolze, author = {K{\"u}hhorn, Arnold and Golze, Mark}, title = {Thickness flexible theory with generalized core warping for plane sandwich-structures}, abstract = {An advanced design of sandwichstructures does not only require the knowledge of the global stress- and deformation behavior, but also the knowledge of the local effects, such as load singularities and the loss of stability caused by the short wave wrinkling of one (bending) or both (pressure) sandwich skins.Based on the nonlinear theory for sandwich shells with seven kinematic degrees of freedom, introduced from K{\"u}hhorn and Schoop an improved theory for plane sandwich shells with eight degrees of freedom (position vector r, director d, and intensity factors az1, az2 for including core flexibility) will be presented, enabling a much better representation of the sandwich core behavior.Due to consideration of quadratic core thickness and linear core shear strain as well as longitudinal core deformation an improved prediction of the wrinkling behavior is succeeded even for thick cores and thin skins.The kinematic quantities as well as the nonlinear-differential equations achieved from the principle of virtual work and the simplified equations of first order theory resulting from them are given.Finally applying the well known classical problems of stability loaded by pressure and bending, the efficiency of this 8 DOF-theory is demonstrated. A comparison with a detailed finite element (plain strain) calculation shows the high quality of these results.The presented sandwich theory characterized by eight kinematic degrees of freedom is valid for arbitrary displacements, rotations and moderat strains enables the calculation of nearly all essential sandwich phenomena even for thick cores.}, language = {en} } @inproceedings{GolzeKuehhorn, author = {Golze, Mark and K{\"u}hhorn, Arnold}, title = {CFK-/GFK-Auslegung am Beispiel eines Modellfl{\"u}gels}, series = {Tagungsband, 14. deutschsprachiges ABAQUS Anwendertreffen, 23. - 24. September 2002 in Wiesbaden}, booktitle = {Tagungsband, 14. deutschsprachiges ABAQUS Anwendertreffen, 23. - 24. September 2002 in Wiesbaden}, publisher = {ABACOM Software GmbH}, address = {Aachen}, abstract = {{\"O}konomische und {\"o}kologische Bed{\"u}rfnisse verlangen von modernen Konstruktionen sowohl eine hochintegrative Bauweise als auch eine massive Gewichtseinsparung. Dies f{\"u}hrt zu neuen Leichtbaukonstruktionen mit einem stetig zunehmenden Anteil an Faserverbundl{\"o}sungen. Die hierbei er{\"o}ffnete M{\"o}glichkeit, kraftfluß- und beanspruchungsgerecht auszulegen, erschließt sich erst vollst{\"a}ndig durch die sichere Anwendung moderner FE-Programme wie beispielsweise ABAQUS. Nutzt man dar{\"u}ber hinaus die M{\"o}glichkeit der flexiblen Script-Programmierung, so lassen sich wirkungsvolle Effizienzsteigerungen durch die gezielte Erstellung spezifischer Eingabemen{\"u}s und Ausgaberoutinen erreichen. Dieser Beitrag veranschaulicht an Hand eines ausgef{\"u}hrten und getesteten CFK-Modellfl{\"u}gels unter Biegebeanspruchung, die Vorgehensweise bei Verwendung von ABAQUS und der Script-Sprache Python.}, language = {de} } @article{KuehhornKlaukeGolze, author = {K{\"u}hhorn, Arnold and Klauke, Thomas and Golze, Mark}, title = {Simulation und Verifikation der sukzessiven Bruchabfolge eines CFK-Bauteils mittels neuartiger Bruchkriterien}, language = {de} } @inproceedings{KlaukeKuehhornGolzeetal., author = {Klauke, Thomas and K{\"u}hhorn, Arnold and Golze, Mark and Villwock, J. and Lenk, Olaf}, title = {Finite-Elemente-Anwendung neuerer Faserverbund-Bruchkriterien und deren Verifizierung mittels CFK-Bauteilpr{\"u}fung}, series = {Deutscher Luft- und Raumfahrtkongress 2003, M{\"u}nchen, 17. bis 20. November 2003, Bd. 1}, booktitle = {Deutscher Luft- und Raumfahrtkongress 2003, M{\"u}nchen, 17. bis 20. November 2003, Bd. 1}, publisher = {Dt. Ges. f{\"u}r Luft- und Raumfahrt}, address = {Bonn}, pages = {113 -- 120}, language = {de} } @inproceedings{BeirowKuehhornGolzeetal., author = {Beirow, Bernd and K{\"u}hhorn, Arnold and Golze, Mark and Parchem, Roland and Johann, E.}, title = {Experimentelle und numerische Untersuchungen hinsichtlich einer Festigkeitsauslegungsoptimierung von Hochdruck-Verdichter-Schaufelscheiben unter besonderer Ber{\"u}cksichtigung von Mistuningeffekten}, series = {Deutscher Luft- und Raumfahrtkongress 2003, M{\"u}nchen, 17. bis 20. November 2003, Bd. 2}, booktitle = {Deutscher Luft- und Raumfahrtkongress 2003, M{\"u}nchen, 17. bis 20. November 2003, Bd. 2}, publisher = {DGLR}, address = {Bonn}, pages = {1495 -- 1504}, language = {de} } @misc{KuehhornBeirowSchrapeetal., author = {K{\"u}hhorn, Arnold and Beirow, Bernd and Schrape, Sven and Golze, Mark and Kn{\"o}pke, Martin}, title = {Simulation fluidged{\"a}mpfter Strukturschwingungen mittels partitionierter Fluid-Struktur-Kopplung}, series = {Forum der Forschung}, volume = {9}, journal = {Forum der Forschung}, number = {18}, issn = {0947-6989}, pages = {79 -- 86}, language = {de} } @inproceedings{BeirowKuehhornGolze, author = {Beirow, Bernd and K{\"u}hhorn, Arnold and Golze, Mark}, title = {Experimental and Numerical Investigations of High pressure Compressor Blades Vibration Behavior Considering Mistuning}, language = {en} } @inproceedings{BeirowKuehhornGolzeetal., author = {Beirow, Bernd and K{\"u}hhorn, Arnold and Golze, Mark and Klauke, Thomas}, title = {Experimentelle Untersuchungen des strukturdynamischen Verhaltens von Hochdruckverdichterschaufeln in Integralbauweise (Blisks) mittels Laser-Doppler-Vibrometrie}, language = {de} }