Experimental and numerical investigations of residual strength after impact of sandwich panels

Klaus, Michael; Reimerdes, Hans-Günther; Gupta, Neelam

doi:10.1016/j.ijimpeng.2012.01.001

Cited by 59 publications

(21 citation statements)

References 5 publications

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“…To model the interaction between the laminas, a cohesive interaction approach has been used to take into account the inter-laminar behaviour. This mix-model between material model and cohesive interaction (available in the LS-DYNA library) has been used previously by others authors [35][36][37]. Following, the different failure modes and the cohesive interaction is described.…”

Section: Materials Modelingmentioning

confidence: 99%

Numerical analysis of high velocity impacts on unidirectional laminates

Pernas-Sánchez

Artero-Guerrero

Viñuela

et al. 2014

Composite Structures

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In this work a numerical methodology to predict the behavior of composite unidirectional laminates under high velocity impact is developed. In order to validate the model, experimental results of high velocity impacts of steel sphere against laminate coupons, were accomplished. The residual velocity in case of penetration and the damaged area in the panel are the variables chosen to validate the results obtained in the numerical methodology proposed. Finally an analysis of the influence of the projectile geometry is accomplished.

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Section: Materials Modelingmentioning

confidence: 99%

Numerical analysis of high velocity impacts on unidirectional laminates

Pernas-Sánchez

Artero-Guerrero

Viñuela

et al. 2014

Composite Structures

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“…Apart from CAI, there have been limited studies on the bending-after-impact (BAI) behaviour of sandwich panels which is one of the loading scenarios during the service life of the product. BAI was studied in G€ ottner et al [34] and Klaus et al [35] performing an LVI and subsequent 4PB tests. A strong dependency between the amount of damage and deformations caused by the impact energy and the bending strength of the damaged sample was found.…”

Section: Introductionmentioning

confidence: 99%

Residual bending behaviour of sandwich composites after impact

Baran

Weijermars

2018

Jnl of Sandwich Structures & Materials

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This work investigates the residual mechanical behaviour of composite sandwich panels in bending after impact loading conditions. The sandwich panels were made of an epoxy/glass face sheet with three different core materials: styrene acrylonitrile foam, polyethylene terephthalate foam and Balsa wood. A three-point bending test was performed in order to determine the reference stiffness. A low-velocity impact test and thereafter the three-point bending test were performed with the same specimens. The failure modes during bending tests were captured using a high-speed camera. It was found that multiple shear cracks with progressive failure were present in the core of styrene acrylonitrile and polyethylene terephthalate panels in bending after impact tests, whereas single shear crack with sudden failure was the case for Balsa panels. The initial bending stiffness decreased approximately 30.5, 35.2 and 55.6% for Balsa, styrene acrylonitrile and polyethylene terephthalate panels, respectively, in bending after impact tests due to the influence of the pre-damage from the low-velocity impact tests. The reduction in collapse force was also quantified for Balsa, styrene acrylonitrile and polyethylene terephthalate panels as 22.8, 4.9 and 22.1%, respectively.

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“…These advantages have led to several research programmes into folded core structure [15][16][17][18][19][20]. Wang and Xu [15] experimentally investigated the soundproof characteristics of folded core sandwich plates.…”

Section: Introductionmentioning

confidence: 99%

Thermal-Mechanical Optimization of Folded Core Sandwich Panels for Thermal Protection Systems of Space Vehicles

Zhou

Zhijin

2017

International Journal of Aerospace Engineering

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The integrated thermal protection system (ITPS) is a complicated system that addresses both mechanical and thermal considerations. An M-pattern folded core sandwich panel packed with low-density insulation material provides inherently low mass for a potential ITPS panel. Herein, we identify the most influential geometric parameters and establish a viable, computationally efficient optimization procedure. Variables considered for optimization are geometric dimensions of the ITPS, while temperature and deflection are taken as constraints. A one-dimensional (1D) thermal model based on a modified form of the rule of mixtures was established, while a three-dimensional (3D) model was adopted for linear static analyses. Parametric models were generated to facilitate a design of experiment (DOE) study, and approximate models using radial basis functions were obtained to carry out the optimization process. Sensitivity studies were first conducted to investigate the effect of geometric parameters on the ITPS responses. Then optimizations were performed for both thermal and thermal-mechanical constraints. The results show that the simplified 1D thermal model is able to predict temperature through the ITPS thickness satisfactorily. The combined optimization strategy evidently improves the computational efficiency of the design process showing it can be used for initial design of folded core ITPS.

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Experimental and numerical investigations of residual strength after impact of sandwich panels

Cited by 59 publications

References 5 publications

Numerical analysis of high velocity impacts on unidirectional laminates

Numerical analysis of high velocity impacts on unidirectional laminates

Residual bending behaviour of sandwich composites after impact

Thermal-Mechanical Optimization of Folded Core Sandwich Panels for Thermal Protection Systems of Space Vehicles

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