Roland Hinterhölzl
Technische Universität München
Composite numberUltimate tensile strengthDigital image correlationEngineeringFinite element methodForming processesComposite laminatesConsolidation (soil)Transverse planeNonlinear systemComposite materialTomographyThermocoupleThermosetting polymerBridging (networking)Glass fiberBoundary value problemHardening (metallurgy)ViscoelasticityProcess simulationMaterials scienceCompactionConstitutive equationJoint (geology)ThermalTension (physics)ThermoformingMandrelStiffnessThermoplasticMaterial propertiesNumerical analysisFiberFailure mode and effects analysisStructural engineeringAdhesiveDynamic mechanical analysisDelaminationDiscretizationMechanical engineeringVoid (astronomy)Stress (mechanics)Shear (geology)Process (computing)
34Publications
13H-index
296Citations
Publications 35
Newest
#1Alexander SchugH-Index: 2
Last. Klaus DrechslerH-Index: 12
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The forming simulation of fibre reinforced thermoplastics could reduce the development time and improve the forming results. But to take advantage of the full potential of the simulations it has to be ensured that the predictions for material behaviour are correct. For that reason, a thorough validation of the material model has to be conducted after characterising the material. Relevant aspects for the validation of the simulation are for example the outer contour, the occurrence of defects and...
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#1Elinor Swery (University of Auckland)H-Index: 7
#2T. Hans (TUM: Technische Universität München)H-Index: 2
Last. Simon Bickerton (University of Auckland)H-Index: 30
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Abstract A complete simulation process chain has been used to predict the production and subsequent injection of over-braided textile preforms. A range of mandrel geometries and braiding configurations were used to illustrate how these factors affect the resin injection of the part. Braiding simulations were first completed, predicting the geometry of the braided textile throughout the mandrel. Following this, a range of multi-layered unit-cells were modelled, capturing the variations in geometr...
14 CitationsSource
#1Alexander SchugH-Index: 2
#2Jonas WinkelbauerH-Index: 1
Last. Klaus DrechslerH-Index: 12
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The aim of this study was to analyse the forming behaviour of glass fibre reinforced polypropylene and to identify the influence of several process parameters on the resulting part quality. For this purpose, a complex forming tool was designed, consisting of several areas with single and double curvature. The specimens were produced from unidirectional (UD) tape using the Fiberforge RELAY2000® automated tape laying machine and a subsequent consolidation step. They were then fixed in a support fr...
3 CitationsSource
#1Tobias Wehrkamp-Richter (TUM: Technische Universität München)H-Index: 4
#2Roland Hinterhölzl (TUM: Technische Universität München)H-Index: 13
Last. Silvestre T. Pinho (Imperial College London)H-Index: 42
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Abstract Damage and failure of triaxial braided composites under multi-axial stress states was investigated. In order to introduce different multi-axial stress states in the material, uni-axial tensile tests were performed at different off-axis orientations. Three braid architectures, comprising braiding angles of 30 ° , 45 ° and 60 ° were each loaded parallel to their axial, transverse and braid yarn direction. Digital image correlation measurement techniques were used to quantify the effects o...
36 CitationsSource
#1Rhena Helmus (TUM: Technische Universität München)H-Index: 3
#2James Kratz (UoB: University of Bristol)H-Index: 10
Last. Roland Hinterhölzl (TUM: Technische Universität München)H-Index: 13
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Out-of-autoclave prepreg processing requires evacuation of volatiles in the early stages of processing to achieve an acceptable final void content. In this study, single prepreg plies were laid-up onto a glass tool to simulate a ply–ply interface, to gain an understanding of initial air entrapment and eventual removal mechanisms. The contact was recorded during processing with various edge breathing configurations to identify the relationship between evacuation pathways and contact evolution. Th...
12 CitationsSource
#1JS Weiland (TUM: Technische Universität München)H-Index: 1
#2Pascal Hubert (McGill University)H-Index: 33
Last. Roland Hinterhölzl (TUM: Technische Universität München)H-Index: 13
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Multi-zonal, electrically heated moulds for composite processing offer the potential of a direct heat introduction with low thermal lag and high energy efficiency. However, appropriate thermal dimensioning of these tools requires the consideration of the thermal response of the tool itself as well as the thermal and cure behaviour of the part, which is to date mostly estimated based on experience. To realize the full potential of this tool class, a numerical method is presented to determine a so...
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#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...
17 CitationsSource
#2Sylvain BelH-Index: 7
Last. Roland HinterhölzlH-Index: 13
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Composite forming simulations consist in modelling the forming process of composite components to anticipate the occurrence of potential flaws such as out-of-plane wrinkles and fibre re-orientation. Forming methods often consist of automated processes in which flat composite blanks are forced to comply with tool geometries. Although Finite Element forming simulations require the modelling of all stakeholders (blankholder, tooling and composite blank), consumables such as separation films are oft...
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#1Natalie Mayer (TUM: Technische Universität München)H-Index: 4
#2Björn Van Den Broucke (Airbus Group)H-Index: 3
Last. Roland Hinterhölzl (TUM: Technische Universität München)H-Index: 13
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A FE mapping algorithm for a data transfer between incompatible meshes is proposed.The structural analysis is based on process simulation data for composites.Only the transfer of fiber orientations is not sufficient for a structural analysis.Material properties such as FVC, permeability and stiffness are predicted.The method is capable of handling partially out-of-plane wrinkling defects. Finite element analysis (FEA) of structural composites is mostly based on an as-designed geometry and input ...
7 CitationsSource