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 -