@article{55743, abstract = {{The use of hybrid materials as a combination of fibre-reinforced plastic (FRP) and metal is of great interest in order to meet the increasing demands for sustainability, efficiency, and emission reduction based on the principle of lightweight design. These two components can therefore be joined using the intrinsic joining technique, which is formed by curing the matrix of the FRP component. In this study, for the hybrid joint, unidirectionally pre-impregnated semi-finished products (prepregs) with duromer matrix resin and micro-alloyed HC340LA steel were used. In order to conduct a detailed investigation, the damage mechanisms of intrinsically produced fibre metal laminates (FMLs), a new clamping device, and a novel pressing tool were designed and put into operation. The prepregs were prestressed by applying a preloading force using a specially designed prestressing frame. Hybrid specimens were then produced and subjected to nanoindentation and a shear tensile test. In particular, the effect of the residual stress state by varying the defined prestressing force on the damage mechanisms was studied. The results showed that no fracture patterns occurred in the interface of the specimens without preloading as a result of curing at 120 °C, whereas specimens with preloading failed at the boundary layer in the tensile range. Nevertheless, all specimens cured at 160 °C failed at the boundary layer in the tensile range. Furthermore, it was proven that the force and displacement of the preloaded specimens were promisingly higher than those of the unpreloaded specimens.}}, author = {{Irmak, Hayrettin and Tinkloh, Steffen Rainer and Marten, Thorsten and Tröster, Thomas}}, issn = {{2504-477X}}, journal = {{Journal of Composites Science}}, keywords = {{CFRP, prestressing, fibre metal laminate, interface, prepreg, shear tensile test}}, number = {{8}}, publisher = {{MDPI AG}}, title = {{{Development of a Tool Concept for Prestressed Fibre Metal Laminates and Their Effect on Interface Failure}}}, doi = {{10.3390/jcs8080316}}, volume = {{8}}, year = {{2024}}, } @article{23431, abstract = {{As an effective and accurate method for modelling composite materials, mean-field homogenization is still not well studied in modelling non-linear and damage behaviours of UD composites. Investigated micro FE-simulations show that the matrix of UD composites exhibits different average plastic behaviour, named as average asymmetric matrix plasticity (AAMP), when the composite behaves different under shear, longitudinal and transverse loadings. In this study, a non-linear mean-field debonding model (NMFDM) combining a mean-field model and a fibre–matrix interface debonding model, is developed to simulate UD composites under consideration of AAMP, fibre–matrix interface damage and progressive failure. AAMP is considered by using so-called stress mode factor, which is expressed in terms of basic invariants of the matrix deviatoric stress tensor and is used as an indicator for detection of differences in the loading mode. The material behaviour of UD composites with imperfect interface is assumed identical as for perfect interface and stiffness reduced fibres. Progressive failure criteria are established with consideration of fibre breakage and matrix crack for different fibre orientations. As a representative example for the NMFDM, a C30/E201 UD composite is studied. To verify the model, experiments are conducted on polymers, carbon fibres and UD CFRPs. Finally, the model is applied to simulate a perforated CFRP laminate, which shows excellent prediction ability on deformation, debonding and progressive failure.}}, author = {{Cheng, C. and Wang, Z. and Jin, Z. and Ju, X. and Schweizer, Swetlana and Tröster, Thomas and Mahnken, Rolf}}, issn = {{1359-8368}}, journal = {{Composites Part B: Engineering}}, keywords = {{Non-linear mean-field homogenization Average asymmetric plasticity of matrix Fibre–matrix interface debonding Micro-mechanical FE-simulation Progressive failure}}, title = {{{Non-linear mean-field modelling of UD composite laminates accounting for average asymmetric plasticity of the matrix, debonding and progressive failure}}}, doi = {{10.1016/j.compositesb.2021.109209}}, volume = {{224}}, year = {{2021}}, } @article{9899, abstract = {{Bainite is a steel microstructure consisting of three phases, bainitic ferrite, austenite and carbides. It forms in two different morphologies, upper and lower bainite, where different diffusion mechanisms are dominant. The aim of this work is to simulate both transformations within a unified model. To this end, we extend an own previously published model for lower bainite with diffusion across the phase interface. As a central idea we introduce weighted Helmholtz energy functions and a weighted mobility tensor, respectively. The individual Helmholtz energy functions and mobility terms are related to the different diffusion mechanisms which are responsible for the formation of both morphologies. Two representative examples illustrate the capability of the coupled phase field/diffusion model and show the expected behaviour.}}, author = {{Düsing, M. and Mahnken, R.}}, issn = {{0020-7683}}, journal = {{International Journal of Solids and Structures}}, keywords = {{Coupled phase field/diffusion model, Bainite, Multiphase field method, Cahn–Hilliard diffusion, Diffusion across the interface, Lower bainitic transformation, Upper bainitic transformation, Thermodynamic framework, Microforce balance}}, pages = {{172--183}}, publisher = {{Elsevier}}, title = {{{„A coupled phase field/diffusion model for upper and lower bainitic transformation”}}}, volume = {{135}}, year = {{2018}}, } @inproceedings{5829, abstract = {{Websites increasingly embed semantic data for search engine optimization. The most common ontology for semantic data, schema.org, is supported by all major search engines and describes over 500 data types, including calendar events, recipes, products, and TV shows. As of today, users wishing to pass this data to their favorite applications, e.g., their calendars, cookbooks, price comparison applications or even smart devices such as TV receivers, rely on cumbersome and error-prone workarounds such as reentering the data or a series of copy and paste operations. In this paper, we present Semantic Data Mediator (SDM), an approach that allows the easy transfer of semantic data to a multitude of services, ranging from web services to applications installed on different devices. SDM extracts semantic data from the currently displayed web page on the client-side, offers suitable services to the user, and by the press of a button, forwards this data to the desired service while doing all the necessary data conversion and service interface adaptation in between. To realize this, we built a reusable repository of service descriptions, data converters, and service adapters, which can be extended by the crowd. Our approach for linking services to websites relies solely on semantic data and does not require any additional support by either website or service developers. We have fully implemented our approach and present a real-world case study demonstrating its feasibility and usefulness.}}, author = {{Wolters, Dennis and Heindorf, Stefan and Kirchhoff, Jonas and Engels, Gregor}}, booktitle = {{2017 IEEE International Conference on Web Services (ICWS)}}, editor = {{Altintas, Ilkay and Chen, Shiping}}, isbn = {{9781538607527}}, keywords = {{Services, Websites, Semantic Data, schema.org, Data Conversion, Interface Adaptation, Mediation}}, publisher = {{IEEE}}, title = {{{Linking Services to Websites by Leveraging Semantic Data}}}, doi = {{10.1109/icws.2017.80}}, year = {{2017}}, } @inproceedings{10677, author = {{Ho, Nam and Kaufmann, Paul and Platzner, Marco}}, booktitle = {{2014 {IEEE} Intl. Conf. on Evolvable Systems (ICES)}}, keywords = {{Linux, cache storage, embedded systems, granular computing, multiprocessing systems, reconfigurable architectures, Leon3 SPARe processor, custom logic events, evolvable-self-adaptable processor cache, fine granular profiling, integer unit events, measurement infrastructure, microarchitectural events, multicore embedded system, perf_event standard Linux performance measurement interface, processor properties, run-time reconfigurable memory-to-cache address mapping engine, run-time reconfigurable multicore infrastructure, split-level caching, Field programmable gate arrays, Frequency locked loops, Irrigation, Phasor measurement units, Registers, Weaving}}, pages = {{31--37}}, title = {{{Towards self-adaptive caches: A run-time reconfigurable multi-core infrastructure}}}, doi = {{10.1109/ICES.2014.7008719}}, year = {{2014}}, } @inproceedings{37046, abstract = {{In this article, we present a flexible simulation environment for embedded real-time software refinement by a mixed level cosimulation. For this, we combine the native speed of an abstract real-time operating system (RTOS) model in SystemC with dynamic binary translation for fast Instruction Set Simulation (ISS) by QEMU. In order to support stepwise RTOS software refinement from system level to the target software, each task can be separately migrated between the native execution and the ISS. By adapting the dynamic binary translation approach to an efficient but yet very accurate synchronization scheme the overhead of QEMU user mode execution is only factor two compared to native SystemC. Furthermore, the simulation speed increases almost linearly according to the utilization of the task set abstracted by the native execution. Hereby, the simulation time can be considerably reduced by cosimulating just a subset of tasks on QEMU.}}, author = {{Becker, Markus and Zabel, Henning and Müller, Wolfgang}}, editor = {{Kleinjohann, L. and Kleinjohann, B.}}, isbn = {{978-3-642-15233-7}}, keywords = {{Application Programming Interface User Mode Kernel Space System Level Design Mixed Level}}, publisher = {{Springer Verlag}}, title = {{{A Mixed Level Simulation Environment for Stepwise RTOS Software Refinement}}}, doi = {{10.1007/978-3-642-15234-4_15}}, year = {{2010}}, } @inproceedings{38100, abstract = {{Smart Cards are becoming a ubiquitous means for securing a wide range of interactive applications. However in many cases its use is limited for authentication purposes only. In this paper we extend the use of smart cards for carrying abstract user interface descriptions which can be rendered on different and potentially remote clients that in addition can support different interaction modalities. This adds on the one hand to the security since a backend application cannot be used without the UI description, and on the other hand to the versatility of applications, since all devices with a respective renderer for certain modalities can be utilized.}}, author = {{Schäfer, Robbie and Müller, Wolfgang and Marin-López, Andrés and Díaz-Sánchez, Daniel}}, booktitle = {{Proceedings of the 9th International Conference on Human Computer Interaction with Mobile Devices and Services (MobileHCI2007)}}, keywords = {{Smart Card, Abstract User Interface, Device Independence}}, title = {{{Device Independent User Interfaces for Smart Cards}}}, year = {{2007}}, } @inproceedings{38543, abstract = {{Today a large variety of mobile interaction devices such as PDAs and mobile phones enforce the development of a wide range of user interfaces for each platform. The complexity even grows, when multiple interaction devices are used to perform the same task and when different modalities have to be supported. We introduce a new dialog model for the abstraction of concrete user interfaces with a separate advanced control layer for the integration of different modalities. In this context, we present the Dialog and Interface Specification Language (DISL), which comes with a proof-of-concept implementation.}}, author = {{Schäfer, Robbie and Bleul, Steffen and Müller, Wolfgang}}, booktitle = {{Proceedings of the 5th International Workshop on Task Models and Diagrams for User Interface Design (TAMODIA'2006)}}, isbn = {{978-3-540-70815-5}}, keywords = {{User Interface Interaction Manager Output Device Multimodal Interface Interaction Object}}, title = {{{Dialog Modelling for Multiple Devices and Multiple Interaction Modalities}}}, doi = {{10.1007/978-3-540-70816-2_4}}, year = {{2006}}, } @inproceedings{11931, abstract = {{The paper is concerned with binaural signal processing for a bimodal human-robot interface with hearing and vision. The two microphone signals are processed to obtain an enhanced single-channel input signal for the subsequent speech recognizer and to localize the acoustic source, an important information for establishing a natural human-robot communication. We utilize a robust adaptive algorithm for filter-and-sum beamforming (FSB) and extract speaker direction information from the resulting FIR filter coefficients. Further, particle filtering is applied which conducts a nonlinear Bayesian tracking of speaker movement. Good location accuracy can be achieved even in highly reverberant environments. The results obtained outperform the conventional generalized cross correlation (GCC) method.}}, author = {{Warsitz, Ernst and Haeb-Umbach, Reinhold}}, booktitle = {{IEEE Workshop on Multimedia Signal Processing (MMSP 2004)}}, keywords = {{bimodal human-robot interface, binaural signal processing, enhanced single-channel input signal, filter-and-sum beamforming, filtering theory, FIR filter coefficient, generalized cross correlation method, microphones, microphone signal, nonlinear Bayesian tracking, particle filtering, robust adaptive algorithm, robust speaker direction estimation, signal processing, speech enhancement, speech recognition, speech recognizer, user interfaces}}, pages = {{367--370}}, title = {{{Robust speaker direction estimation with particle filtering}}}, doi = {{10.1109/MMSP.2004.1436569}}, year = {{2004}}, } @inproceedings{39350, abstract = {{Variation in different mobile devices with different capabilities and interaction modalities as well as changing user context in nomadic applications, poses huge challenges to the design of user interfaces. To avoid multiple designs for each device or modality, it is almost a must to employ a model-based approach. In this short paper, we present a new dialog model for multimodal interaction together with an advanced control model, which can either be used for direct modeling by an interface designer or in conjunction with higher level models.}}, author = {{Schäfer, Robbie and Bleul, Steffen and Müller, Wolfgang}}, booktitle = {{Proceedings of EHCI-DSVIS 2005}}, keywords = {{Multimodal User Interface High Level Model Multimodal User High Level Approach Dialog Model}}, title = {{{A Novel Dialog Model for the Design of Multimodal User Interfaces}}}, year = {{2004}}, }