Function‐integrative Lightweight Engineering – Design Methods and Applications

Modler, Niels; Winkler, Anja; Filippatos, Angelos; Weck, Daniel; Dannemann, Martin

doi:10.1002/cite.202000010

Cited by 12 publications

(14 citation statements)

References 57 publications

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“…For each criterion, the relevant failure mode was determined using the engineering stress and the relevant strengths [32,38]. 3 1.450 1 In fiber direction ( ) and perpendicular to the fiber direction (⊥).…”

Section: Materials and Failure Behavior Of Polymer And Composite Stru...mentioning

confidence: 99%

“…The Honeycomb core structures are used for a variety of different applications, focusing lightweight sandwich structures with specific high flexural properties and a high bending stiffness. In the sense of a function-integrative lightweight design, as described by Modler et al [1], these structural properties can be combined with functional properties such as acoustic damping. A very well-known example is the acoustic liner, which is used to reduce engine-introduced noise in various engineering applications, such as in automobiles and aircrafts [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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Numerical Buckling Analysis of Hybrid Honeycomb Cores for Advanced Helmholtz Resonator Liners

et al. 2021

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In order to realize novel acoustic liners, honeycomb core structures specially adapted to these applications are required. For this purpose, various design concepts were developed to create a hybrid cell core by combining flexible wall areas based on thermoplastic elastomer films and rigid honeycomb areas made of fiber-reinforced thermoplastics. Within the scope of the presented study, a numerical approach was introduced to analyze the global compressive failure of the hybrid composite core structure, considering local buckling and composite failure according to Puck and Cuntze. Therefore, different geometrical configurations of fiber-reinforced tapes were compared with respect to their deformation as well as their resulting failure behavior by means of a finite element analysis. The resulting compression strength obtained by a linear buckling analysis agrees largely with calculated strengths of the more elaborate application of the failure criteria according to Puck and Cuntze, which were implemented in the framework of a nonlinear buckling analysis. The findings of this study serve as a starting point for the realization of the manufacturing concept, for the design of experimental tests of hybrid composite honeycomb core structures, and for further numerical investigations considering manufacturing as well as material specific aspects.

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Section: Materials and Failure Behavior Of Polymer And Composite Stru...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Buckling Analysis of Hybrid Honeycomb Cores for Advanced Helmholtz Resonator Liners

et al. 2021

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“…The relatively new group of textile-reinforced plastics offers particular advantages for complex applications, espe-cially in the fields of aerospace, automotive, marine and mechanical engineering, medical technology and sports equipment [4][5][6]. In this context, such parts were further modified by adhesively bonding of additional functional elements to the composite structure or integrating them into the composite lay-up [7][8][9][10][11][12][13][14]. In most cases, these elements represent sensors, actuators, conductive paths, and small electronic elements.…”

Section: Introductionmentioning

confidence: 99%

“…In most cases, these elements represent sensors, actuators, conductive paths, and small electronic elements. They can be used for different purposes, once they enable the monitoring of the composite structures and allow a forecast of damage propagation or failure [10,15,16].…”

Section: Introductionmentioning

confidence: 99%

“…The second main advantage is that they only need very low manufacturing temperatures compared to metals. Thus, a wide variety of modern flat functional elements, such as sensors, actuators, antennas and generators can be integrated directly into the manufacturing process of the textile-reinforced components, which enables further weight and performance advantages of the resulting light-weight system [10].…”

Section: Introductionmentioning

confidence: 99%

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Delamination Behaviour of Embedded Polymeric Sensor and Actuator Carrier Layers in Epoxy Based CFRP Laminates—A Study of Energy Release Rates

Hornig

Winkler

Bauerfeind³

et al. 2021

Polymers

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Fiber reinforced composites combine low density with high specific mechanical properties and thus became indispensable for today’s lightweight applications. In particular, carbon fibre reinforced plastic (CFRP) is broadly used for aerospace components. However, damage and failure behaviour, especially for complex fibre reinforcement set-ups and under impact loading conditions, are still not fully understood yet. Therefore, relatively large margins of safety are currently used for designing high-performance materials and structures. Technologies to functionalise the materials enabling the monitoring of the structures and thus avoiding critical conditions are considered to be key to overcoming these drawbacks. For this, sensors and actuators are bonded to the surface of the composite structures or are integrated into the composite lay-up. In case of integration, the impact on the mechanical properties of the composite materials needs to be understood in detail. Additional elements may disturb the composite structure, impeding the direct connection of the composite layers and implying the risk of reducing the interlaminar integrity by means of a lower delamination resistance. In the presented study, the possibility of adjusting the interface between the integrated actuator and sensor layers to the composite layers is investigated. Different polymer layer combinations integrated into carbon fibre reinforced composite layups are compared with respect to their interlaminar critical energy release rates GIc and GIIc. A standard aerospace unidirectionally reinforced (UD) CFRP prepreg material was used as reference material configuration. The investigations show that it is possible to enhance the mechanical properties, especially the interlaminar energy release rate by using multilayered sensor–actuator layers with Polyimide (PI) outer layers and layers with low shear stiffness in between.

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State of the Art of Embedded Strain Sensors for Fiber Reinforced Plastics

Scholle¹

2023

Mechanics and Adaptronics

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Function‐integrative Lightweight Engineering – Design Methods and Applications

Cited by 12 publications

References 57 publications

Numerical Buckling Analysis of Hybrid Honeycomb Cores for Advanced Helmholtz Resonator Liners

Numerical Buckling Analysis of Hybrid Honeycomb Cores for Advanced Helmholtz Resonator Liners

Delamination Behaviour of Embedded Polymeric Sensor and Actuator Carrier Layers in Epoxy Based CFRP Laminates—A Study of Energy Release Rates

State of the Art of Embedded Strain Sensors for Fiber Reinforced Plastics

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