An Integral Mesoscopic Material Characterization Approach

Härtel, Frank; Böhler, Patrick; Middendorf, Peter

doi:10.4028/www.scientific.net/kem.611-612.280

Cited by 10 publications

(3 citation statements)

References 12 publications

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“…To investigate the influence of those parameters on the relative movement of the fibers to the base material a pull-out-test is performed using the ZSD-test-rig (Fig. 4) located at the Institute of Aircraft Design, University of Stuttgart [4,5,6].…”

Section: Experimental Tests and Resultsmentioning

confidence: 99%

Path Definition for Tailored Fiber Placement Structures Using Numerical Reverse Draping Approach

Böhler

Carosella

Goetz

et al. 2015

KEM

Self Cite

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The properties of fiber reinforced materials are depending on the fiber direction. During draping processes - which are necessary to form complex structures - the fiber direction and therefore the resulting properties of the final part are changing.To ensure that the fibers in the final complex structure are placed exactly in the direction needed, a new approach is investigated.The idea is to define the orientation of the reinforcement fibers based on the distribution of forces in a complex structure under certain loading determined by a structural simulation. Best lightweight behavior is achievable in the final complex structure. A three-dimensional mesoscopic model of the directed fibers is created using FEM-software. In reverse draping simulations the three-dimensional fibers are formed from complex shape to a two-dimensional flat sheet.In manufacturing the two-dimensional patches can be created using the tailored fiber placement process. With this process it is possible to place the fibers orientated to the required paths. The patches are formed to the necessary three-dimensional shape by a real draping process. The relative sliding behavior of crossing fibers can be achieved by varying the stitch during the TFP process.Using that approach it is possible to create lightweight structures in which fibers are orientated directly along the load paths of the three-dimensional application.

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Section: Experimental Tests and Resultsmentioning

confidence: 99%

Path Definition for Tailored Fiber Placement Structures Using Numerical Reverse Draping Approach

Böhler

Carosella

Goetz

et al. 2015

KEM

Self Cite

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“…Continuous ap proaches model forming processes in a homogenized manner, whereas in discrete and mesoscopic approaches the single constituents of the material are modelled. For discrete and mesoscopic approaches, less detailed approaches can be applied to forming simulation [79,98,159,188,189], whereas very detailed approaches are applied solely to virtual material characterization [190 194]. An exception are discrete approaches, where only the reinforcement is modelled by (discrete) truss and beam elements [59,195,196].…”

Section: Forming Simulationmentioning

confidence: 99%

Fast processing and continuous simulation of automotive structural composite components

Henning

Kärger

Dörr

et al. 2019

Composites Science and Technology

116

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Due to application-specific tailoring, continuous fiber reinforced plastics (CoFRP) provide an exceptional lightweight potential and are particularly suited for structural components. The use of CoFRP specifically for weight reduction of the automotive car body is the major focus of this feature article. Automotive mass production requires fast and qualified, thus highly automated and material efficient manufacturing technologies. Consequently, CoFRP manufacturing for automotive differs considerably from conventional CoFRP manufacturing for aerospace, particularly in terms of higher throughput with higher investment, but lower operating effort. Furthermore, automotive structures have smaller dimensions with more complex shapes, which makes it more challenging to avoid forming defects and to ensure complete injection. Since manufacturing makes the main difference between automotive and aerospace composite components, this feature article puts emphasis on the process technologies and on the corresponding material behavior and process simulation methods. For a holistic product design of automotive CoFRP components, a simultaneous virtual description and virtual optimization of both manufacturing process and structural capacity is necessary. Production effects must be considered in the part design and, thus, must be reliably predicted by process simulation as well as taken into account in subsequent simulation steps. This feature article therefore evaluates the current state of the art in the continuous virtual representation of CoFRP process chains, including the process steps forming, injection and curing. Furthermore, the integrated optimization along this CAE chain is a key factor for an economic part design and therefore another major subject of this article.

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“…The combination of both loadings might change shear load-displacement behaviour. This issue has been addressed very recently in experimental work [10,11] presenting a device capable of applying combined tension, shear and lateral pressure on the fabric specimen, and in a finite element model of composite forming [12]. Unlike these studies focusing on macroscopic and mesoscopic fabric behaviour, the current paper presents a novel experimental rig designed to investigate fabric behaviour at the microscale under simultaneous shear and compression loading.…”

Section: Introductionmentioning

confidence: 99%

Novel Experimental Method for Microscale Contact Analysis in Composite Fabric Forming

Smerdova

Sutcliffe

2015

Exp Mech

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This paper describes a novel experimental rig and associated experimental method developed to investigate composite fabric/tool contact at the microscopic scale. A key feature of this method is that it enables direct observation of real contact at the scale of fibres and the evolution of this contact under simultaneous application of shear and compression loads. To observe the contact, an optical semi-reflective coating is used. An algorithm is developed to analyse the contact images and measure the real contact length and orientation of individual fibres. The method is applied to microcontacts of carbon twill fabric. The real contact length under an apparent pressure of 1.9 kPa is surprisingly small compared to the apparent contact length. Transverse forces associated with friction are also measured. However these results are difficult to interpret as the test generates friction forces which differ from those which would be seen in conventional sliding friction tests.

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An Integral Mesoscopic Material Characterization Approach

Cited by 10 publications

References 12 publications

Path Definition for Tailored Fiber Placement Structures Using Numerical Reverse Draping Approach

Path Definition for Tailored Fiber Placement Structures Using Numerical Reverse Draping Approach

Fast processing and continuous simulation of automotive structural composite components

Novel Experimental Method for Microscale Contact Analysis in Composite Fabric Forming

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