Compression Response of Fluted-Core Composite Panels

Schultz, Marc R.; Oremont, Leonard; Guzman, Juan C.; McCarville, Douglas A.; Rose, Cheryl A.; Hilburger, Mark W.

doi:10.2514/1.j051728

Cited by 7 publications

(1 citation statement)

References 8 publications

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“…2–7 The low-density foam core, being a very soft material, may not provide enough out-of-plane stiffness and strength to the sandwich structure rendering it prone to damage when subject to local loading. Various types of cores have been investigated to enhance the behavior of the sandwich composite materials such as Flute-core, 8 Z-pin, 9–14 stitched foam, 15 and truss core. 16 Z-pinning provides a means of reinforcement in which composite or metal pins are inserted into the foam core at specific angles at regular intervals to strengthen the sandwich structure.…”

Section: Introductionmentioning

confidence: 99%

A viable model for out-of-plane compressive and shear properties of Z-pin reinforced composite sandwich panels

Virakthi

Kwon

Lee

2018

Journal of Composite Materials

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This paper attempts at developing a computational-analytical model to represent the behavior of Z-pin reinforced X-Cor composite sandwich panels under out-of-plane compression and shear loading. Parameters important in representing the behavior of the individual components of the sandwich are identified. The softening of Z-pins under compression from geometric and material imperfections, densification of the foam, and pin-facesheet interface strengths are incorporated into the model. For validation, the values of the parameters are obtained from experiments performed in house, and then for comparison, they are used to estimate the stiffness and strength of the specimens with experimentally obtained results reported in an open literature. Good correlation using these parameters across different specimens has implications on development of a predictive methodology for the behavior of Z-pin reinforced sandwich materials under compression and shear.

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Section: Introductionmentioning

confidence: 99%

A viable model for out-of-plane compressive and shear properties of Z-pin reinforced composite sandwich panels

Virakthi

Kwon

Lee

2018

Journal of Composite Materials

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An experimental study of the compression response of fluted-core composite panels with joints

Schultz

Rose

Guzman

et al. 2014

Composites Part B: Engineering

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Fluted-core sandwich composites consist of integral angled web members spaced between laminate face sheets, and may have the potential to provide benefits over traditional sandwich composites for certain aerospace applications. However, fabrication of large autoclave-cured fluted-core cylindrical shells with existing autoclaves will require that the shells be fabricated in segments, and joined longitudinally to form a complete barrel. Two different longitudinal fluted-core joint designs were considered experimentally in this study. In particular, jointed fluted-core-composite panels were tested in longitudinal compression because longitudinal compression is the primary loading condition in dry launch-vehicle barrel sections. One of the joint designs performed well in comparison with unjointed test articles, and the other joint design failed at loads approximately 14% lower than unjointed test articles. The compression-after-impact (CAI) performance of jointed fluted-core composites was also investigated by testing test articles that had been subjected to 6 ft-lb impacts. It was found that such impacts reduced the load-carrying capability by 9% to 40%. This reduction is dependent on the joint concept, component flute size, and facesheet thickness.

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Fabrication and testing of composite corrugated-core sandwich cylinder

Sun

Wei

et al. 2018

Composites Science and Technology

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Compression Response of Fluted-Core Composite Panels

Cited by 7 publications

References 8 publications

A viable model for out-of-plane compressive and shear properties of Z-pin reinforced composite sandwich panels

A viable model for out-of-plane compressive and shear properties of Z-pin reinforced composite sandwich panels

An experimental study of the compression response of fluted-core composite panels with joints

Fabrication and testing of composite corrugated-core sandwich cylinder

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