H. Koerber
Technische Universität München
Composite numberUltimate tensile strengthDigital image correlationDeformation (engineering)Strain rateDynamic range compressionTransverse planeComposite materialBar (music)Compression (physics)Materials scienceTension (physics)Dynamic loadingCompressive strengthStrain energy release rateFracture (geology)Fracture mechanicsFailure mode and effects analysisStructural engineeringAdhesiveDelaminationStress (mechanics)Fracture toughness
13Publications
7H-index
155Citations
Publications 13
Newest
#1Giuseppe Catalanotti ('QUB': Queen's University Belfast)H-Index: 22
#2Peter Kuhn (TUM: Technische Universität München)H-Index: 72
Last. H. Koerber (TUM: Technische Universität München)H-Index: 7
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Abstract The elastic parameters, strengths, and intralaminar fracture toughness are determined for an E-Glass polymer composite material system, statically and at high strain rate, adapting methodologies previously developed by the authors for different carbon composites. Dynamic experiments are conducted using tension and compression Split-Hopkinson Bars (SHBs). A unique set of experimental parameters is obtained, and reported together with the experimental set-up, in order to ensure reproducib...
3 CitationsSource
#1M.W. Joosten (Deakin University)H-Index: 7
#2C. Hirth (TUM: Technische Universität München)H-Index: 1
Last. H. Koerber (TUM: Technische Universität München)H-Index: 7
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Abstract This paper presents the quasi-static energy absorption of open section monolithic carbon-epoxy specimens for a range of environmental test conditions. Experimental observations showed that the test temperature influenced the failure mode; elevated temperatures (>23 °C) resulted in the specimens exhibiting a splaying failure mode whilst reduced test temperature (−35 °C) resulted in a brittle failure mode. Despite the difference in failure modes, the reduced and elevated test conditions b...
6 CitationsSource
#2José XavierH-Index: 25
Last. H. Koerber (TUM: Technische Universität München)H-Index: 7
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Abstract The high strain rate compressive behaviour of Pinus pinaster Ait. wood along the radial and tangential material axes was addressed in this work. Both quasi-static and dynamic tests were considered for comparation purposes. The quasi-static compression tests were performed on rectangular prismatic specimens along the radial and tangential directions coupled with digital image correlation. The high strain rate tests were carried out using a classical split-Hopkinson pressure bar coupled w...
Source
#1Peter Kuhn (TUM: Technische Universität München)H-Index: 72
#1Peter Kuhn (TUM: Technische Universität München)H-Index: 4
Last. H. Koerber (TUM: Technische Universität München)H-Index: 7
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Abstract This paper presents the determination of the crack resistance curve of the unidirectional carbon-epoxy composite material IM7-8552 for intralaminar fiber tensile failure under dynamic loading. The methodology, proposed by Catalanotti et al. (2014) for quasi-static loading conditions, was enhanced to high rate loading in the order of about 60 s −1 . Dynamic tests were performed using a split-Hopkinson tension bar, while quasi-static reference tests were conducted on a standard electromec...
5 CitationsSource
#1Peter Kuhn (TUM: Technische Universität München)H-Index: 72
#1Peter Kuhn (TUM: Technische Universität München)H-Index: 4
Last. José Xavier (National Institute of Statistics and Geography)H-Index: 25
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Automotive and aeronautical composite structures can be subjected to dynamic loading scenarios (e.g. crash, bird strike). In both industrial areas, energy-based damage models for composite materials, able to predict initiation and evolution of damage of a composite ply under various loading conditions, are increasingly used. These models require the specification of fracture toughness parameters for the main failure modes. In previous works [1],[2], the authors have successfully enhanced a metho...
Source
#1H. Koerber (TUM: Technische Universität München)H-Index: 7
#2Peter Kuhn (TUM: Technische Universität München)H-Index: 72
Last. Pedro P. Camanho (University of Porto)H-Index: 70
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The mechanical response of IM7-8552 carbon epoxy was investigated for transverse tension and transverse tension/in-plane shear loadings at static and dynamic strain rates using transverse tension and off-axis tension specimens. The dynamic tests were carried out on a split-Hopkinson tension bar at axial strain rates from 113 to 300 $\hbox {s}^{-1} s - 1 . With the already available off-axis and transverse compression test data for IM7-8552, a comprehensive data set is available now, which can...
11 CitationsSource
#1Peter Kuhn (TUM: Technische Universität München)H-Index: 72
#1Peter Kuhn (TUM: Technische Universität München)H-Index: 4
Last. H. Koerber (TUM: Technische Universität München)H-Index: 7
view all 5 authors...
Abstract This work presents an experimental method to measure the compressive crack resistance curve of fiber-reinforced polymer composites when subjected to dynamic loading. The data reduction couples the concepts of energy release rate, size effect law and R-curve. Double-edge notched specimens of four different sizes are used. Both split-Hopkinson pressure bar and quasi-static reference tests are performed. The full crack resistance curves at both investigated strain rate regimes are obtained...
23 CitationsSource
#1Marina Ploeckl (TUM: Technische Universität München)H-Index: 5
#2Peter Kuhn (TUM: Technische Universität München)H-Index: 72
Last. H. Koerber (TUM: Technische Universität München)H-Index: 7
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Abstract This paper presents an experimental study of the strain-rate effect on the longitudinal compressive strength of UD carbon-epoxy IM7/8552 and UD carbon-fiber-reinforced polyamide-6. A test setup for dynamic measurements using a split-Hopkinson pressure bar was developed to achieve valid compressive failure in the specimen’s free gauge section. The setup presented improves on the dynamic compression fixture developed in an earlier study [Koerber and Camanho, Composites Part A 2011;42]. Gr...
24 CitationsSource
#1Jörg Cichosz (TUM: Technische Universität München)H-Index: 1
#2Tobias Wehrkamp-Richter (TUM: Technische Universität München)H-Index: 4
Last. Pedro P. Camanho (National Institute of Statistics and Geography)H-Index: 70
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Abstract This paper focuses on the mechanical characterization of ( ± 30 ° ) 2 × 2 biaxial braided composites under multiaxial stress states. Off-axis experiments in tension and compression were used to introduce multiaxial stresses in the material. The characterization was focused on nonlinear deformation and failure behavior: loading/unloading of the specimen was used to identify the mechanisms for nonlinear deformation and a high-speed-camera is used to record the failure mode of the specimen...
16 CitationsSource
#1J. Neumayer (TUM: Technische Universität München)H-Index: 2
#2H. Koerber (TUM: Technische Universität München)H-Index: 7
Last. Roland Hinterhölzl (TUM: Technische Universität München)H-Index: 13
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Abstract Delaminations can change the mechanical behaviour of bonded joints significantly in crash simulations. A cohesive element is presented that enables the simulation of delamination failure in bonded joints on a full scale structural level. The principle of the approach is to compute the through thickness stresses of the adherends analytically within the cohesive element representing the cohesive behaviour of the complete adhesive. Via a stress based interaction criterion it becomes possib...
11 CitationsSource