The role of symmetry in the post-buckling behaviour of structures

Zucco, Giovanni

doi:10.1098/rspa.2019.0609

Cited by 7 publications

(4 citation statements)

References 67 publications

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“…In this case, point P6 experiences a shift in the value of the displacement, due to the buckling. This can be confirmed by monitoring the strains of the internal and external points considering a maximum Indeed, Figures 18-20 highlight the symmetrical out-of-plane displacement patterns resulting from the structural response of these symmetric systems (due to the adopted material formulation), as suggested in [37].…”

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confidence: 54%

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Dynamic Pulse Buckling of Composite Stanchions in the Sub-Cargo Floor Area of a Civil Regional Aircraft

et al. 2020

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This work is focused on the investigation of the structural behavior of a composite floor beam, located in the cargo zone of a civil aircraft, subjected to cyclical low-frequency compressive loads with different amplitudes. In the first stage, the numerical models able to correctly simulate the investigated phenomenon have been defined. Different analyses have been performed, aimed to an exhaustive evaluation of the structural behavior of the test article. In particular, implicit and explicit analyses have been considered to preliminary assess the capabilities of the numerical model. Then, explicit non-linear analyses under time-dependent loads have been considered, to predict the behavior of the composite structure under cyclic loading conditions. According to the present investigation, low-frequency cyclic loads with peak values lower than the static buckling load value are not capable of triggering significant instability.

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confidence: 54%

“…Out-of-plane displacement: 1.0 mm applied displacement. Indeed, Figures 18-20 highlight the symmetrical out-of-plane displacement patterns resulting from the structural response of these symmetric systems (due to the adopted material formulation), as suggested in [37].…”

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confidence: 92%

Dynamic Pulse Buckling of Composite Stanchions in the Sub-Cargo Floor Area of a Civil Regional Aircraft

et al. 2020

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“…Both deformation patterns shown in Fig. 15 exhibit central symmetry, and this is due to the fact that the stiffness terms D 16 and D 26 are nonzero for both panels [45,46].…”

Section: B Panel Under Pure Compressionmentioning

confidence: 92%

Continuous Tow Steering Around an Elliptical Cutout in a Composite Panel

Zucco¹,

Rouhi²,

Oliveri³

et al. 2021

AIAA Journal

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Cutouts are widely used to accommodate windows, openings for access purposes, or fasteners in the primary structural parts of airplanes. The presence of cutouts in composite panels results in stress or strain concentrations, leading to potentially reduced load-carrying capacity. Steering tows around cutouts using emerging techniques in three-dimensional (3-D) printing and advanced fiber placement can potentially alleviate such problems. Continuous tow steering around cutouts also eliminates fiber cutting, thereby precluding ply-level 3-D stress concentration, which could otherwise lead to delamination-induced damage. This work examines stress and strain concentrations, using continuous tow steering, around a representative wingbox access hole. Buckling response under compression loading together with stress and strain concentrations under both tensile and compression loads are examined. A steered configuration shows a 26% improvement in buckling performance in comparison with the equivalent straight-fiber configuration. Under tensile loading, the maximum stress and strain concentration factors around the cutout are 29 and 32% larger, respectively, for straight-fiber orientations than those with steered tows around the cutout. For the compression loading condition, the direct strain of the panel with straight-fiber orientations was found to be three times that of steered-fiber trajectories in the vicinity of the cutout.

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“…Subsequently, computational efficiency can be drastically improved by using the dominating modes only. In another study by Zocco et al, 174 the importance of symmetry in post-buckling response analysis is discussed. Curie’s principle is used to exploit symmetric properties.…”

Section: General Studies On Variable Stiffness Composites With Optimi...mentioning

confidence: 99%

Recent developments in manufacturing, mechanics, and design optimization of variable stiffness composites

Punera

Mukherjee

2022

Journal of Reinforced Plastics and Composites

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The functional advantages of tailored stiffness, often seen in nature, are also utilized in composite structures. Advancements in the multiaxis tow placement and automated fiber placement (AFP) machines led to the development of variable angle tow (VAT) composites, also referred further as variable stiffness composites (VSC). These composites are shown to effectively enhance the stress distribution and buckling load capacity of structures with greater flexibility on the design space. This review systematically presents the status of recent research on the topic of VSCs. Various manufacturing techniques of VSC are discussed; constraints and the defects associated with the manufacturing processes are enlisted. The review highlights the optimization studies based on the fiber profile and macro-scale stiffness invariants. Several studies existing in the domain of buckling, vibration, and aeroelastic tailoring of angle tow composites are summarized to connect the important aspects of analysis and present a holistic approach for future studies in this area.

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The role of symmetry in the post-buckling behaviour of structures

Cited by 7 publications

References 67 publications

Dynamic Pulse Buckling of Composite Stanchions in the Sub-Cargo Floor Area of a Civil Regional Aircraft

Dynamic Pulse Buckling of Composite Stanchions in the Sub-Cargo Floor Area of a Civil Regional Aircraft

Continuous Tow Steering Around an Elliptical Cutout in a Composite Panel

Recent developments in manufacturing, mechanics, and design optimization of variable stiffness composites

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