Composite grid structure technology for space applications

Giusto, G.; Totaro, G.; Spena, P.; Nicola, F. De; Caprio, Francesco Di; Zallo, A.; Grilli, Andrea; Mancini, Victor H.; Kiryenko, S.; Das, S.; Mespoulet, S.

doi:10.1016/j.matpr.2020.05.754

Cited by 21 publications

(7 citation statements)

References 5 publications

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“…Cylinders are one of the important load-carrying structures of spacecraft and serve as the key determinant of carrying load-bearing capability. [6][7][8] Introducing lattices into composite cylindrical shells is considered one of the most promising strategies for improving mechanical properties while reducing weight. 9 Among the lattices, hierarchical lattice stiffened structures inspired by the hierarchical concepts of bionics have gained recognition for their ability to balance deformation and improve load-bearing efficiency.…”

Section: Introductionmentioning

confidence: 99%

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Manufacturing and mechanical properties of adjustable stiffness hierarchical orthogrid stiffened cylinders

Wang,

Chen,

Qin

et al. 2024

Polymer Composites

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Modular spacecraft offer promising prospects in the aerospace industry due to their ability to adapt to complex missions and diverse space environments. Nevertheless, such spacecraft may face load‐bearing structure adaptation issues caused by the changes in load demand when replacing sub‐modules for various missions. This necessitates the re‐design and manufacturing of load‐bearing structures, resulting in significant increases in product cycles and costs. To overcome this challenge, innovative composite hierarchical orthogrid stiffened cylinders (CHOSCs) which offer adjustable stiffness and strength to suit various mission requirements are proposed. To investigate the stiffness and strength adjustability, high‐precision composite orthogrid stiffened cylinder (COSC), CHOSC with three primary ribs (T‐CHOSC), and CHOSC with four primary ribs (F‐CHOSC) were manufactured and tested. The results demonstrate that CHOSCs exhibit stiffness and strength adjustability and significantly improve the cylinder's load‐bearing efficiency. Furthermore, a finite element model based on the Hashin damage criterion was employed to capture the end failure of the primary ribs and the local basic rib fractures near the cylinder end. CHOSCs present a feasible solution to the load‐bearing structure adaptation issues caused by the changes in load demand when replacing sub‐modules for various missions and hold significant potential for advancing the aerospace industry.Highlights Composite hierarchical orthogrid stiffened cylinders (CHOSCs) are proposed. High‐precision CHOSCs are manufactured by combined metal molds. Load‐bearing capacity and failure behavior are investigated. CHOSCs exhibit stiffness adjustability and load‐bearing efficiency. CHOSCs could solve the structure adaptation issues in modular spacecraft.

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Section: Introductionmentioning

confidence: 99%

“…Cylinders are one of the important load‐carrying structures of spacecraft and serve as the key determinant of carrying load‐bearing capability 6–8 . Introducing lattices into composite cylindrical shells is considered one of the most promising strategies for improving mechanical properties while reducing weight 9 .…”

Section: Introductionmentioning

confidence: 99%

Manufacturing and mechanical properties of adjustable stiffness hierarchical orthogrid stiffened cylinders

Wang,

Chen,

Qin

et al. 2024

Polymer Composites

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“…Как правило, для работы конструкции вида тонкостенной оболочки, основанной на сетчатых структурах, не требуется наличие обшивки -все внешние нагрузки с успехом воспринимаются и передаются ребрами сетчатой структуры [1][2][3][4][5][6][7][8]. Однако большинство сетчатых конструкций, особенно предназначенных для работы в качестве составных частей ракет-носителей (РН), все же имеют внутренние или внешние обшивки, преимущественно выполненные из полимерных композиционных материалов (ПКМ), применение которых обусловлено либо необходимостью создания внешней поверхности летательного аппарата для восприятия аэродинамических сил набегающего потока, либо технологическими особенностями процесса их изготовления.…”

Section: Introductionunclassified

Solution of the optimization problem for the purpose of designing a lattice polymer composite structure with the outer skin

Skleznev

Chervyakov

Agapov

2022

Naučn. vestn. MGTU GA

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In recent years, the urgency of the problem of launch vehicles load-bearing elements optimal design has continued to grow. One of the widespread structural designs is an anisogrid lattice structure made of polymer composite materials. Such structures are mass-produced and used as load-bearing bodies of space vehicles or fuselage compartments of atmospheric aircraft of advanced structural design. Until now, the weight and parameters of the skins used in products of rocket and space equipment have not been considered when solving optimal design problems, and the design problem has been reduced to optimizing lattice structures without skin. At the same time, the very use of skins for both atmospheric aircraft and load-bearing elements for space applications is a fairly common practice. However, not considering the availability of skin when designing a lattice load-bearing shell can lead to a significant increase in the mass of the structure with skin when applicable. The paper presents a method for the optimal design of lattice structures without ring ribs, but with the metal skin available, which can significantly reduce the weight of such structures, increasing the mass efficiency of products made of polymer composite materials used in aircraft. A confirmation of the results obtained with the help of an analytical solution and the results of a numerical experiment, obtained by modeling using the finite element method, is given. It is expected that the use of the proposed approach by considering the contribution of the skin response can lead to mass saving of the shell anisogrid structure up to 30 % compared with the methods of optimal design of lattice anisogrid structures currently used without considering the availability of skin in the design of the product.

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“…improved fatigue performance (Shanmugam et al , 2021). The combination of both lightweight design and materials in composite cellular structures intrigued wide interests in fields such as aerospace and nuclear engineering (Djavadifar et al , 2021; Giusto et al , 2021; Liu et al , 2020). Thus, the past decades have witnessed an increasing number of studies exploring the large design space of composite cellular structures.…”

Section: Introductionmentioning

confidence: 99%

A graph-based path planning method for additive manufacturing of continuous fiber-reinforced planar thin-walled cellular structures

Zhang

Wang

et al. 2022

RPJ

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Purpose Composite cellular structures have wide application in advanced engineering fields due to their high specific stiffness and strength. As an emerging technology, continuous fiber-reinforced polymer additive manufacturing provides a cost-effective solution for fabricating composite cellular structures with complex designs. However, the corresponding path planning methods are case-specific and have not considered any manufacturing constraints. This study aims to develop a generally applicable path planning method to fill the above research gap. Design/methodology/approach This study proposes a path planning method based on the graph theory, yielding an infill toolpath with a minimum fiber cutting frequency, printing time and total turning angle. More specifically, the cellular structure design is converted to a graph first. Then, the graph is modified to search an Eulerian path by adding an optimal set of extra edges determined through the integer linear programming method. Finally, the toolpath with minimum total turning angle is obtained with a constrained Euler path search algorithm. Findings The effectiveness of the proposed method is validated through the fabrication of both periodic and nonperiodic composite cellular structures, i.e. triangular unit cell-based, Voronoi diagram-based and topology optimized structures. The proposed method provides the basis for manufacturing planar thin-walled cellular structures of continuous fiber-reinforced polymer (CFRP). Moreover, the proposed method shows a notable improvement compared with the existing method. The fiber cutting frequency, printing time and total turning angle have been reduced up to 88.7%, 52.6% and 65.5%, respectively. Originality/value A generally applicable path planning method is developed to generate continuous toolpaths for fabricating cellular structures in CFRP-additive manufacturing, which is an emerging technology. More importantly, manufacturing constraints such as fiber cutting frequency, printing time and total turning angle of fibers are considered within the process planning for the first time.

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Composite grid structure technology for space applications

Cited by 21 publications

References 5 publications

Manufacturing and mechanical properties of adjustable stiffness hierarchical orthogrid stiffened cylinders

Manufacturing and mechanical properties of adjustable stiffness hierarchical orthogrid stiffened cylinders

Solution of the optimization problem for the purpose of designing a lattice polymer composite structure with the outer skin

A graph-based path planning method for additive manufacturing of continuous fiber-reinforced planar thin-walled cellular structures

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