Mechanical tests for foldcore base material properties

Fischer, Sebastian; Drechsler, Klaus; Kilchert, Sebastian; Johnson, Alastair

doi:10.1016/j.compositesa.2009.03.005

Cited by 107 publications

(57 citation statements)

References 7 publications

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“…In recent years, engineers have looked to the ancient Japanese tradition of origami to inspire the evolution of engineering structures that can be fabricated, assembled, stored and morphed in unique ways [72,177]. The applications of foldable structures are widespread and have been implemented in an array of practical scenarios including in the design and deployment of solar sails [211] and space telescopes [55,249], in sandwich panel cores [66,85], in the folding of sheet metal [53], in packaging and containers [52,251], in robotics [62,89,127,167], biomedical devices [65,122,190] and electronics [80,96,161,218,228,259].…”

Section: Foldable Structuresmentioning

confidence: 99%

HCI meets Material Science

Qamar

Groh

Holman

et al. 2018

Proceedings of the 2018 CHI Conference on Human Factors in Computing Systems

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Section: Foldable Structuresmentioning

confidence: 99%

HCI meets Material Science

Qamar

Groh

Holman

et al. 2018

Proceedings of the 2018 CHI Conference on Human Factors in Computing Systems

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“…10 were conducted, using the nonlinear explicit finite element code LS-DYNA. A meso-mechanical approach [24][25][26] was chosen, where the WSFC walls are modelled in detail by 4-node shell elements. The continuum damage mechanics (CDM)-based material model Mat_La-minated_Composite_Fabric (MAT58) [27,28] was applied for the Kevlar Ò paper impregnated with phenol resin.…”

Section: Numerical Simulationmentioning

confidence: 99%

Wedge-shaped folded sandwich cores for aircraft applications: from design and manufacturing process to experimental structure validation

et al. 2011

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The problem of honeycomb sandwich structures with moisture ingression can be avoided by replacing the honeycombs through chevron-folded cores. The application to real aircraft components often requires wedgeshaped sandwich. With folded cores, this kind of geometric shape can be obtained only by special folding schemes which have a significant influence on the mechanical performance. A comprehensive experimental investigation of the relation between folding geometry and structural properties of wedge-shaped folded cores (WSFC) is very time consuming and expensive. Therefore, a procedure based on numerical methods has been developed to predict the structural response of this kind of cores under compressive and shear loading. The approach is based on a numerical tool that provides finite element models of arbitrary WSFC as well as the explicit finite element solver LS-DYNA for simulation. These tools were applied to investigate the influence of the inner core geometry and different materials on the mechanical properties of WSFC structures. To verify these results, a test programme was conducted. Test samples were manufactured using a newly developed folding process. Also special test devices to determine the compression and shear properties of the WSFC specimens were developed. The achieved test results show a good agreement with the behaviour predicted by simulation.

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“…Breaking of the paper/ resin occurred at 22.5 MPa and 40 MPa in the transversal and fibre directions, respectively. Fischer et al [43] performed tension and compression tests on an aramid paper pre-impregnated with phenolic resin that was considered to be very similar to Nomex paper. They showed that the paper presented different plastic behaviour in compression and tension.…”

Section: Properties Of Nomex Papermentioning

confidence: 99%

Experimental and numerical analysis of the shear nonlinear behaviour of Nomex honeycomb core: Application to insert sizing

Rodríguez-Ramírez

Castanié

Bouvet

2018

Composite Structures

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numerical analysis of the shear nonlinear behaviour of Nomex honeycomb core: Application to insert sizing. Composite Structures, Elsevier, 2018, vol. 193, pp. 121-139. 10.1016/j.compstruct.2018 A B S T R A C TThis work is a contribution to the understanding of the nonlinear shear behaviour caused by cell postbuckling in Nomex honeycomb cores. First, an experimental benchmark study was made of different designs for the shear testing of honeycomb cores. Then, several test specimens were fabricated and tested, a 3D DIC system being used to measure and record the displacements. An Artificial Neural Network (ANN) was also used to identify the onset of bucking and collapse of the cells. The influence of the overall boundary conditions of shear tests on the buckling of the cells is presented both experimentally and numerically. The reversibility and test procedure results suggest that it may be possible to allow the shear strength to be increased by up to 35% under certain conditions.

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Mechanical tests for foldcore base material properties

Cited by 107 publications

References 7 publications

HCI meets Material Science

HCI meets Material Science

Wedge-shaped folded sandwich cores for aircraft applications: from design and manufacturing process to experimental structure validation

Experimental and numerical analysis of the shear nonlinear behaviour of Nomex honeycomb core: Application to insert sizing

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