A Methodology to Investigate Skin-Stringer Separation in Postbuckled Composite Stiffened Panels

Kootte, Lucas; Bisagni, Chiara

doi:10.2514/6.2020-0477

Cited by 5 publications

(5 citation statements)

References 24 publications

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“…A solution would be developing MAPOD curves at a specimen level for different opening modes and opening mode-mixity. Then, using a building block approach [ 64 ], one could transpose the results to a higher-level component, selecting the MAPOD curve obtained in the scenario that better approximates the expected strain field near the damaged location.…”

Section: Discussionmentioning

confidence: 99%

A Model-Assisted Probability of Detection Framework for Optical Fiber Sensors

Falcetelli

Yue

Rossi³

et al. 2023

Sensors

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Optical fiber sensors (OFSs) represent an efficient sensing solution in various structural health monitoring (SHM) applications. However, a well-defined methodology is still missing to quantify their damage detection performance, preventing their certification and full deployment in SHM. In a recent study, the authors proposed an experimental methodology to qualify distributed OFSs using the concept of probability of detection (POD). Nevertheless, POD curves require considerable testing, which is often not feasible. This study takes a step forward, presenting a model-assisted POD (MAPOD) approach for the first time applied to distributed OFSs (DOFSs). The new MAPOD framework applied to DOFSs is validated through previous experimental results, considering the mode I delamination monitoring of a double-cantilever beam (DCB) specimen under quasi-static loading conditions. The results show how strain transfer, loading conditions, human factors, interrogator resolution, and noise can alter the damage detection capabilities of DOFSs. This MAPOD approach represents a tool to study the effects of varying environmental and operational conditions on SHM systems based on DOFSs and for the design optimization of the monitoring system.

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Section: Discussionmentioning

confidence: 99%

A Model-Assisted Probability of Detection Framework for Optical Fiber Sensors

Falcetelli

Yue

Rossi³

et al. 2023

Sensors

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“…The single-stringer specimen is chosen such that the buckling deformation of the panel is replicated [9]. The panel length parallel to the stringer is 140 mm while the width is 254 mm.…”

Section: Single-stringer Specimen Analysis and Criterion Verificationmentioning

confidence: 99%

“…A methodology is currently under development to study the interaction between the skin-stringer separation and the postbuckled shape of multi-stringer panels using single-stringer specimens [9]. This paper investigates the initiation of skin-stringer separation using an analytical approach.…”

Section: Introductionmentioning

confidence: 99%

“…Subsequently, a failure index is calculated in order to estimate the applied displacement where the stringer will start to separate from the skin due to the postbuckling deformations. Following the methodology [9], a representative single-stringer specimen is designed that can be used to verify the initiation of skin-stringer separation as well as to study the skin-stringer separation in more detail, numerically and experimentally. It is believed that an accurate prediction of the interaction between the skin and stringer leads to a better understanding of the effects of design parameters on skin-stringer separation modes.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Composite Stiffened Panel Design on Skin-Stringer Separation in Postbuckling

Kootte

Bisagni

Ranatunga

et al. 2021

AIAA Scitech 2021 Forum

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To design aeronautical composite multi-stringer panels that can safely operate in a postbuckled state, it is important to identify the parameters that can influence the different modes in which skin-stringer separation might occur. A methodology is under development to study the interaction between the skin-stringer separation and the postbuckling deformation using the building block approach and single-stringer specimens. In particular, the methodology can identify whether the skin-stringer separation occurs due to bending or twisting, so that these two possible modes can be studied separately. For bending, a simple criterion that can predict the location of initiation is presented. This procedure has the potential to reduce the overall development cost and allows the investigation of the design parameters that influence the skin-stringer separation.

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“…Pennas, 29 Browning, 30,31 and Mehrabadi et al 32 studied the mode III stratified fracture of composite materials using the ECT method, which is an effective test method for the mode III fracture toughness that is widely used in engineering applications at present. 33 Kootte et al [34][35][36] developed the ECT test method for characterizing the mode III fracture of the skin-stiffener interface induced by post-buckling. Their new test setup recreates the fourpoint layout that can trigger separation due to twisting.…”

Section: Introductionmentioning

confidence: 99%

Post-buckling failure analysis of composite stiffened panels considering the mode III fracture

Wang¹,

Chen²,

Wang

et al. 2022

Journal of Composite Materials

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Fully utilizing the post-buckling capacity of stiffened composite panels is important to reduce the weight of aeronautical composite structures. However, owing to the complex post-buckling failure modes and mechanisms, there are no effective analysis methods. This paper explores the impacts of the mode III fracture energy on the damage behavior of the stiffener–skin interface of composite stiffened panels under post-buckling conditions. To characterize the bonding interface damage, an interface damage initiation criterion considering the effects of through-thickness compression on the shear failure was used and combined with the Reeder damage extension criterion, which considers the mode III fracture. The mode III fracture toughness characteristics of the damage evolution of the stiffener–skin interface were obtained using the edge crack torsion (ECT) test method. Moreover, the compressive deformation response, buckling load, buckling modes, failure load, and failure modes of the panel were obtained by a compression test of I-shaped stiffened panels. Based on the aforementioned experimental data and numerical model, the post-buckling behavior of the I-shaped stiffened composite panels with an open cross-section stiffener was studied. It was found that the mode III fracture energy caused by the longitudinal shear stress τ31 played a major role in the stiffener–skin interface damage extension of the stiffened panels. Therefore, the mode III fracture behavior should not be ignored in the post-buckling analysis. The numerical analysis method developed can accurately predict the damage initiation and evolution processes of the composite panel interface. The method can be effectively used for post-buckling analysis of aeronautical composite panels.

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A Methodology to Investigate Skin-Stringer Separation in Postbuckled Composite Stiffened Panels

Cited by 5 publications

References 24 publications

A Model-Assisted Probability of Detection Framework for Optical Fiber Sensors

A Model-Assisted Probability of Detection Framework for Optical Fiber Sensors

Effect of Composite Stiffened Panel Design on Skin-Stringer Separation in Postbuckling

Post-buckling failure analysis of composite stiffened panels considering the mode III fracture

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