TY - CONF A1 - Marotzke, Christian T1 - Limits in the determination of mechanical properties of composites by off-axis tests T2 - European SAMPE Conference CY - Paris, France DA - 2014-03-10 PY - 2014 AN - OPUS4-30337 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian A1 - Feldmann, Titus T1 - Limits in the determination of mechanical properties of composites by off-axis tests N2 - Off-axis tests are widely used for the determination of the anisotropic mechanical properties of composite materials, this is, the longitudinal E-modulus and the strength. The mechanical properties are evaluated from the test data under idealising assumptions such as homogeneity of the material as well as a homogeneous stress distribution. In real off-axis tests, however, significant deviations from the idealising assumptions are present. The reduction of the accuracy of the results strongly depends on the off-axis angle. In this paper a series of off-axis tests is analysed. The stresses on potential failure plane are calculated by finite element analyses. By varying the geometrical parameters it is shown how small deviations from the ideal case influence the measured elastic constants and the strength. Especially at low off-axis angles the mechanical properties strongly vary with the angle. In addition, fracture surfaces for different shear/normal stress combinations are studied and typical phenomena are identified. T2 - SEICO 14 - SAMPE Europe 35th International conference and forum CY - Paris, France DA - 10.03.2014 KW - Off-axis test KW - Composites KW - Strength KW - E-modulus PY - 2014 SN - 978-90-821727-0-6 IS - Session 5B SP - 293 EP - 300 AN - OPUS4-30376 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Fracture mechanics on microscale of composite plies under transverse loading T2 - ECCM 16 - 16th European Conference on Composite Materials CY - Seville, Spain DA - 2014-06-22 PY - 2014 AN - OPUS4-31012 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Fracture Processes in Composites under Off-Axis Loading T2 - 28. Workshop Composite Forschung in der Mechanik CY - Paderborn, Deutschland DA - 2015-12-09 PY - 2015 AN - OPUS4-35300 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Limits of the continuum mechanical treatment of problems on micro- and nanoscale. T2 - COMPO 2014 CY - Rehovot, Israel DA - 2014-04-28 PY - 2014 AN - OPUS4-30639 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian A1 - Feldmann, Titus ED - Thomson, Ole T1 - Characterisation of failure processes of composite plies under transverse loading N2 - For the design of laminates the knowledge of the failure behaviour of plies under multiaxial stresses is a necessary precondition. The strength of plies under multiaxial stresses commonly is determined by standard off-axis tests using fixed clamps. By varying the off axis angle the ratio of shear to normal stresses can be prescribed. However, by preventing the rotation a complex stress field develops which strongly varies with the off axis angle as well. While these effects are not crucial when determining the elastic material parameters since the stress state in the center of the specimen is not far from the ideal uniaxial stress state they have a great influence on the failure behaviour. T2 - ICCM20 CY - Copenhagen, Danmark DA - 19. 07. 2015 KW - debonding KW - composites KW - failure process KW - fracture mechanics KW - energy release rate PY - 2015 UR - www.iccm-central.org/Proceedings/ICCM20proceedings/ VL - 2015 SP - Paper No. 3314-4 page 01 EP - Paper No. 3314-4 page 09 AN - OPUS4-36414 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Influence of loading rate and loading time on mechanical behaviour of epoxy resins N2 - Epoxy resins are frequently used for advanced fiber reinforced composites applications. Even though the fibers are dominating strength and stiffness of the composites, specifically when loaded in fiber direction, the failure usually initiates in the matrix near or directly at the interface. Especially in plies loaded transverse to the fiber direction, the mechanical behaviour is highly influenced by the mechanical properties of the epoxy matrix. Accordingly the mechanical properties of the matrix are of great importance. T2 - 10th International conference on the mechanics of time dependent materials (MTDM) CY - Paris, France DA - 17. 06. 2016 KW - Viscoelasticity KW - Epoxy resin KW - Loading rate KW - Relaxation KW - Residual strain PY - 2016 AN - OPUS4-36407 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Failure of fiber reinforced composites under multiaxial stresses on microscale N2 - The failure of composites is initiated by imperfections on microscale. The interface between fiber and matrix is a key parameter concerning failure initiation. In order to get an improved understanding of local failure processes a fracture mechanical analysis of interfacial failure in a composite ply under transverse stresses is performed. The mixed mode energy release rate is calculated. In addition the failure of interfaces under cyclic loading is studied on a single fiber model. The quasistatic debonding process is compared with the interfacial failure under fatigue loading. It is shown that the tan delta can be used as an indicator for the damage propagation. T2 - ICMFF11 CY - Sevilla, Spain DA - 01. 06. 2016 KW - Composites KW - Failure KW - Energy release rate PY - 2016 AN - OPUS4-36746 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Fracture on microscale of fiber reinforced composites N2 - Failure of composite materials is initiated by fracture processes on microscale, especially by interfacial debonding. Failure processes taking place on microscale are studied by single fiber experiments. This is, single fibers embedded in tensile specimen are loaded under various off-axis angles. Starting at microdefects interface cracks propagate circumferentially as well as longitudinally, depending on the loading angle. In addition, finite element simulations of interfacial crack propagation around single fibers as well as fibers embedded in a hexagonal composite are shown based on linear elastic fracture mechanics. The course of the energy release rate is given in dependence of the fiber volume fraction. T2 - Seminar CY - Imperial College, London, UK DA - 12.10.2016 KW - Composites KW - Fracture surfaces KW - Micromechanics KW - Epoxy resin PY - 2016 AN - OPUS4-37853 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Failure on microscale of epoxy resin and composites - limits of continuum mechanical analysis on micro- and nanoscale N2 - The problems of the limits of continuum mechanics are shown on some examples. The fiber-matrix debonding and subsequent crack propagation in fiber reinforced composites is studied. While Finite Element Analyses predict clear crack surfaces, either following the interface or bridging to the neighbouring fiber forming planes, the actual surfaces are very cliffy. Due to the much larger fracture surfaces and the completely different stress states on the cliffy fracture surfaces the continuum mechanical prediction is far from the actual local behaviour. The phenomenon of local high stresses which re much higher than the macroscopically measured strength of the material is also encountered in general fracture mechanics. The scale dependency of materials is shown on indentation tests conducted on different scales. From a continuum mechanical point of view it makes no difference if the indentation test is performed on a nano-, micro- or macroscale, because it is a matter of self-similarity. However, in nano- or microindentation tests on a pure polymer using e.g. a Berkovic indentor, the extremely high stress concentrations arising at the indentor tip are domination more or less the whole region around the indentor. In case of a macroscopical test, this zone covers only a small part of the material loaded by the indentor. Accordingly, the results of the different test cannot be scaled up. T2 - Second International Symposium on Directions in Damage and Durability of Composite Materials CY - Venedig, Italy DA - 18.06.2016 KW - continuum mechanics KW - fracture mechanics KW - epoxy resin KW - plasticity KW - large deformations PY - 2016 AN - OPUS4-37857 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Failure processes of fiber reinforced composites under off-axis loading T2 - ICM 12 - 12th International Conference on the Mechanical Behavior of Materials CY - Karlsruhe, Germany DA - 2015-05-10 PY - 2015 AN - OPUS4-33183 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian A1 - Feldmann, Titus T1 - Fracture of fiber reinforced materials under off-axis loading N2 - The failure behaviour of unidirectional plies tested under off-axis loading is studied. The stress distribution occurring in standard off-axis tests is briefly discussed. The different failure modes, this is, pure fiber breakage, pure inter fiber failure as well as a superposition of both is analysed based on test data and fracture patterns. The large difference of the failure load depending on the failure mode at small off-axis angles is studied by comparison of a short and a long 3° off-axis angle specimen. T2 - APCF/SIF-2014 - Asian-Pacific conference on fracture and strength / International conference on structural integrity and failure - Recent advances in structural integrity analysis CY - Sydney, Australia DA - 09.12.2014 KW - Debonding KW - Off-axis strength KW - Fracture mechanics KW - Composite materials PY - 2014 SN - 978-0-08-100203-2 SN - 978-0-08-100225-4 SP - 351 EP - 355 PB - Elsevier AN - OPUS4-32324 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Identification of material properties of epoxy resins by micro- and nanoindentation tests T2 - GUC Workshop Materials Research and Industry CY - Berlin, Germany DA - 2014-05-13 PY - 2014 AN - OPUS4-30663 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Limits of continuum mechanics in analysing failure processes in fiber reinforced composites on microscale T2 - Composite Damage Workshop VI CY - Gerona, Spain DA - 2014-09-08 PY - 2014 AN - OPUS4-31346 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian A1 - Feldmann, Titus T1 - Fracture mechanics on microscale of composite plies under transverse loading N2 - The energy release rate delivered during the debonding of a fiber inside a composite ply is analysed using a representative volume element. Two different fiber volume fractions are studied by a linear elastic fracture mechanical analysis by using the finite element method. The dependency of the mixed mode energy release rate on the length of the crack increment is analysed. It is shown that the same general behaviour found in case of a straight Interface crack is valid also for circular cracks. As a result the discrimination of the energy release rate into mode I and mode II portions is questionable. T2 - ECCM16 - 16th European conference on composite materials CY - Seville, Spain DA - 22.06.2014 KW - Composite KW - Interface crack KW - Energy release rate KW - Mode mixity PY - 2014 SN - 978-84-616-9798-4 SP - 0472-1 EP - 0472-8 AN - OPUS4-31133 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Interface cracks on microscale in composites T2 - ECF20 - 20th European Conference on Fracture CY - Trondheim, Norway DA - 2014-06-30 PY - 2014 AN - OPUS4-31017 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Fracture mechanical analysis of fiber-matrix debonding in fiber reinforced materials T2 - IMP Workshop Composites@IMP CY - Villeurbanne, France DA - 2014-03-27 PY - 2014 AN - OPUS4-30470 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Failure of fiber reinforced composites – role of the matrix behaviour and the interface strength N2 - Failure of fiber reinforced composites initiates at microdefects in the matrix or at the interface. The interface strength is calculated from the stress field directly before crack initiation by nonlinear finite element simulations. Large deformations and plastic material behaviour are taken into account. Microscopical inspections of the fibers after failure show only small regions with adhering matrix material. This indicates that the interface strength is below the matrix strength. T2 - 2nd International Conference on Mechanics of Composites CY - Porto, Portugal DA - 12.07.2016 KW - composites KW - fracture mechanics KW - nonlinear material behaviour PY - 2016 AN - OPUS4-36905 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - The influence of local defects and nonlinear matrix behaviour on the failure process of fiber reinforced composites N2 - The aim of the paper is to analyse the failure process taking place on microscale in fiber reinforced composites. The failure is initiated at microscopical defects presumingly in the interface. The circumferential propagation of interface cracks starting at microdefects in unidirectional plies under transverse loading is studied using a representative volume element. First a linear elastic fracture mechanical analysis of interface cracks in a carbon fiber reinforced epoxy resin is performed by calculating the mixed mode energy release rate using the virtual crack closure method. The influence of the fiber spacing is studied by varying the fiber volume fraction. The total energy release rate rapidly grows after crack initiation indicating an unstable crack propagation. The first phase is dominated by mode I. The mode II energy release rate starts slightly delayed but surpasses the mode I part after a short crack length. By increasing the fiber volume fraction the maximum of the energy release rate shifts to smaller crack angles. T2 - ECCM17 CY - Munich, Germany DA - 27.06.2016 KW - fracture mechanics KW - interface crack KW - plasticity PY - 2016 AN - OPUS4-36906 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian A1 - Feldmann, Titus T1 - The influence of local defects and nonlinear matrix behaviour on the failure process of fiber reinforced composites N2 - The premise for the development of improved failure criteria for fiber reinforced composites is the understanding of the failure processes on microscale. On microscale the local behaviour of the matrix polymer is crucial. It significantly differs from that found in macroscopic measurements. The present study is focused on the plastic material behaviour of a standard epoxy resin. Local plastic strains are measured in tensile test by using digital image correlation. A multilinear plastic law is implemented by the experimental data. The stress field arising in an idealised representative volume element of a unidirectional ply is analysed by finite element calculations. The change of the stress and strain field due to plastic deformation according to the multilinear plastic law is shown. The change leads to a shift of the critical locations where failure is likely to initiate. In addition, the failure type changes from stress based to strain based failure. The dominant role of the shear strains is shown. T2 - ECCM17 CY - Munich, Germany DA - 27.06.2016 KW - failure mechanisms KW - plasticity KW - micromechanics KW - interfacial stresses KW - local deformation PY - 2016 SN - ISBN 978-3-00-053387-7 SP - 1 EP - 8 CY - München AN - OPUS4-37863 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian A1 - Feldmann, Titus T1 - Failure of fiber reinforced composites under multiaxial stresses on microscale N2 - The failure of composites is initiated by imperfections on microscale. The interface between fiber and matrix is a key parameter concerning failure initiation. In order to get an improved understanding of local failure processes a fracture mechanical analysis of interfacial failure in a composite ply under transverse stresses is performed. The mixed mode energy release rate is calculated. In addition the failure of interfaces under cyclic loading is studied on a single fiber model. The quasistatic debonding process is compared with the interfacial failure under fatigue loading. It is shown that the tan delta can be used as an indicator for the damage propagation. T2 - ICMFF11 CY - Sevilla, Spain DA - 01.06.2016 KW - failure mechanics KW - failure mechanisms KW - multiaxial loading KW - micromechanics PY - 2016 SP - 1 EP - 8 AN - OPUS4-37864 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Failure modes of unidirectional fiber reinforced materials under off-axis loading T2 - ICCS18 - 18th International Conference on Composite Structures CY - Lissabon, Portugal DA - 2015-06-15 PY - 2015 AN - OPUS4-33445 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Verfahren zur Messung der Adhäsion zwischen Faser und Matrix - Einfluss der Faserbeschlichtung T2 - Rotorblätter von Windkraftanlagen - 7th Technical Conference CY - Essen, Deutschland DA - 2015-06-23 PY - 2015 AN - OPUS4-33478 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - MATERIALS NONLINEARITY AND FAILURE ON MICROSCALE T2 - Composite Damage Workshop CY - Vicenza, Italy DA - 2015-09-09 PY - 2015 AN - OPUS4-34452 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - FAILURE MECHANISMS IN FIBER REINFORCED PLASTICS ON MICROSCALE T2 - EUROMAT 2015 CY - Warsaw, Poland DA - 2015-09-21 PY - 2015 AN - OPUS4-34453 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Characterisation of failure processes of composite plies under transverse loading T2 - ICCM 20 - 20th International Conference on Composite Materials CY - Copenhagen, Denmark DA - 2015-07-19 PY - 2015 AN - OPUS4-34182 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Viscoelastic behaviour and fracture of epoxy resins under mixed mode loading T2 - Thermosets 2015 CY - Berlin, Germany DA - 2015-09-16 PY - 2015 AN - OPUS4-34183 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Adhäsion zwischen Faser und Matrix - Schlüssel zu leistungsfähigen Verbundwerkstoffen T2 - DVS - 50 Jahre Kleb-, Gießharz und Laminiertechnik, BAM CY - Berlin, Germany DA - 2011-01-21 PY - 2011 AN - OPUS4-23073 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Interface Faser-Matrix - welche Rolle spielt das Interface bei der Festigkeit von Faserverbundwerkstoffen T2 - 15. Nationales SAMPE Symposium, BAM CY - Berlin, Germany DA - 2009-02-18 PY - 2009 AN - OPUS4-19016 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Failure Processes in Fiber Reinforced Polymers T2 - Thermosets 2009 CY - Berlin, Germany DA - 2009-09-30 PY - 2009 AN - OPUS4-20057 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Influence of the interface on the strength of fiber reinforced polymers T2 - 14th European Conference on Composite Materials, ECCM 14 CY - Budapest, Hungary DA - 2010-07-07 PY - 2010 AN - OPUS4-21264 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Influence of the interface on the strength of fiber reinforced polymers N2 - The debonding of fibers under mixed-mode loading is studied on model composites containing fibers with different orientations with respect to the loading direction. The spacing of the fibers is large, accordingly no significant fiber interaction takes place. For any fiber orientation, interfacial debonding occurs, even though at different load levels. Only for the low off-axis angle, additional fiber fracture is found. Using a rectangular specimen, the interface crack starts at the edges propagating into the center at low speed. In the first phase, only the central part of the interface debonds. After the whole fiber is debonded, the crack propagates in circumferential direction. The superimposition of fiber breakage and debonding shows that the restriction of two potential failure planes - perpendicular or parallel to the fibers - has to be put in question. T2 - 14th European conference on composite materials CY - Budapest, Hungary DA - 2010-06-07 KW - Strength KW - Composites KW - Crack propagation PY - 2010 IS - Paper 708-ECCM14 SP - 1 EP - 10 AN - OPUS4-21278 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian A1 - Kalinka, Gerhard T1 - Local failure processes in fiber reinforced polymers N2 - The breakage of a fiber and its effect on the strain energy is studied in a model composite, this is, a single fiber embedded in a dogbone specimen. The fracture process is recorded by an acoustic emission device, the crack patterns are monitored under a microscope. A finite element analysis is performed in order to estimate the energy released by different failure scenarios. The abilities and limitations of the acoustic emission analysis in characterizing different failure types in fiber reinforced composites are evaluated. T2 - ICCM17 - 17th International conference on composite materials CY - Edinburgh, UK DA - 2009-07-27 KW - Fiber KW - Interface KW - Composite material KW - Failure KW - Acoustic emission KW - Fracture mechanics KW - Energy release rate KW - Finite element analysis PY - 2009 IS - D7:8 SP - 1 EP - 10 CY - Edinburgh, UK AN - OPUS4-21295 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Strength of Composite Structural Parts - Role of Fiber/Matrix Interface T2 - SAMPE-SEICO Conference CY - Paris, France DA - 2011-03-28 PY - 2011 AN - OPUS4-23462 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Strength of composite structural parts - role of the fiber/matrix interface N2 - The strength of laminates distinctly depends on the transverse strength of the laminas. The transverse failure is dominated by the adhesion between fiber and matrix. Usual strength criteria however do not take into account the adhesive strength explicitly. The determination of the interface strength is performed on the micromechanical scale using single fiber specimens. The fibers are loaded under off-axis loading while the debonding is monitored under a microscope. The stresses acting in the Interface are calculated by finite element analyses. It is found that for off-axial angles up to 35° interfacial debonding is the dominant failure mode while fiber breakage takes place at lower angles. The occurrence of fiber breakage and debonding under off-axis loading shows that the restriction to two potential failure planes - perpendicular or parallel to the fibers - as applied in common failure criteria has to be put in question. T2 - SEICO 11 - SAMPE Europe - 32nd International technical conference CY - Paris, France DA - 28.03.2011 KW - Composites KW - Strength KW - Adhesion PY - 2011 SN - 978-3-9523565-3-1 IS - Session 3B SP - 250 EP - 257 AN - OPUS4-23680 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Festigkeit von Faserverbundwerkstoffen - vom Interface zum Werkstoff T2 - Kolloquium der Fraunhofer-Einrichtung für Polymermaterialien und Composite PYCO und Brandenburgische Technische Universität Cottbus Lehrstuhl Polymermaterialien CY - Teltow, Germany DA - 2008-12-09 PY - 2008 AN - OPUS4-18371 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Local failure processes in fiber reinforced polymers T2 - International Conference on Composite Materials (ICCM17) CY - Edinburgh, Scotland DA - 2009-07-27 PY - 2009 AN - OPUS4-18372 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - The interface strength - key to physically based failure criterion for composites T2 - IIMM 2010 Conference, Interfaces and Interphases in Multicomponent Materials CY - Sheffield, England DA - 2010-09-01 PY - 2010 AN - OPUS4-21879 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Micromechanical investigation of fiber reinforced materials by finite element analysis T2 - FEMCAD and OPTIMIZATION CY - Los Angeles, CA, USA DA - 1990-11-05 PY - 1990 AN - OPUS4-5965 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Spannungsfeld infolge Temperatur und Delamination beim Single Fiber Pull-out Versuch T2 - Composite Forschung in der Mechanik 3 CY - Paderborn, Germany DA - 1990-12-06 PY - 1990 AN - OPUS4-5967 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Analysis of singularities and interfacial crack propagation in micromechanical tests T2 - DFI-1 CY - Vienna, Austria DA - 1997-09-22 PY - 1997 AN - OPUS4-5925 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Rissausbreitung in Faser-Matrix-Grenzflächen T2 - DVM AG (Mixed-Mode Probleme) CY - Zittau, Germany DA - 1997-11-21 PY - 1997 AN - OPUS4-5926 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Singularities and Interface Cracks in Micromechanical Tests T2 - 10. Workshop Composite Forschung in der Mechanik CY - Paderborn, Germany DA - 1997-12-09 PY - 1997 AN - OPUS4-5927 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Measurement and theoretical analysis of the interfacial toughness by micromechanical experiments, Part II T2 - Gordon Research Conference on Composites CY - Ventura, CA, USA DA - 1998-01-04 PY - 1998 AN - OPUS4-5934 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Untersuchung der Kraftübertragung im Mehrphasenmaterial am Beispiel von Faserverbundwerkstoffen T2 - "GAMM Tagung" CY - Karlsruhe, Germany DA - 1989-03-28 PY - 1989 AN - OPUS4-5955 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Mikromechanische Untersuchung des Kraftübertragungsmechanismus zwischen Faser und Matrix bei Verbundwerkstoffen T2 - 24. Journées Européennes des Composites - JEC 24 CY - Paris, France DA - 1989-04-19 PY - 1989 AN - OPUS4-5957 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Untersuchung der Kraftübertragung bei Faserverbundwerkstoffen mit Hilfe der Finite Element Methode T2 - Composite Forschung in der Mechanik 2 CY - Karlsruhe, Germany DA - 1989-11-30 PY - 1989 AN - OPUS4-5958 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Einfluss eines Grenzflächenrisses auf das Spannungsfeld in der Faserumgebung bei Faserverbundwerkstoffen T2 - "GAMM Tagung" CY - Hanover, Germany DA - 1990-04-01 PY - 1990 AN - OPUS4-5959 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Mechanik des Faser-Polymer Verbundes T2 - DGZfP Seminar CY - Berlin, Germany DA - 1990-06-12 PY - 1990 AN - OPUS4-5961 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Finite element analysis of the single fiber pull-out test T2 - STRUCENG and FEMCAD CY - Grenoble, France DA - 1990-10-17 PY - 1990 AN - OPUS4-5963 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Determination of the interfacial toughness using micromechanical tests T2 - ECCM-7, Seventh European Conference on Composite Materials CY - London, England DA - 1996-05-14 PY - 1996 AN - OPUS4-5918 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marotzke, Christian T1 - Interfacial crack propagation with friction arising in single fiber pull-out tests T2 - ICCI-VI - The Sixth International Conference on Composite Interfaces CY - Tel Aviv, Israel DA - 1996-05-05 PY - 1996 AN - OPUS4-5919 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -