Novel criteria for strength predictions of open-hole composite laminates for preliminary design

Wallner, Cassio; Almeida, Sérgio Frascino Müller de; Kassapoglou, Christos

doi:10.1016/j.compstruct.2019.111409

Cited by 10 publications

(5 citation statements)

References 37 publications

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“…This paper proposes two novel fracture criteria for bearing failure strength on composite laminates based on the failure criteria developed by Wallner, Almeida and Kassapoglou. 11 The Modified ABSC and Modified PBSC yielded very good correlations for the experimental data presented in this article.…”

Section: Discussionmentioning

confidence: 55%

“…In this work two novel fracture criteria for bearing failure strength on composite laminates are proposed based on the failure criteria initially developed by Wallner, Almeida and Kassapoglou 11 with the aim of having a simple and yet accurate fracture criterion for estimating the strength of composite laminates with circular open-holes. It is worth mentioning that previous works 11,12 demonstrated that the modified Point Stress Criterion (PSC) and the modified Average Stress Criterion (ASC) presented reliable and accurate predictions of the fracture stress of laminates with open circular holes under tensile and compressive loading. The Point Stress Criterion establishes that the laminate fails if the stress fracture along the fiber direction of a 0° layer (45° in the case of an angle ply) reaches its maximum stress at a distance d 0 along the critical path.…”

Section: Introductionmentioning

confidence: 99%

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Fracture criteria and surrogate models for bearing strength of mechanically fastened joints on hybrid composite laminates

Wallner,

Almeida

2023

Journal of Composite Materials

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In this work two novel criteria for strength predictions of bearing failure on mechanically fastened composite joints are proposed for preliminary design. These criteria can estimate the bearing strength of hybrid laminates, which makes them innovative and applicable to a much wider range of aircraft structures that usually use this type of laminate in mechanical joints. The new approach uses characteristic lengths d0 and a0 to estimate the joint strength in bearing. Three surrogate models based on a linear regression of lamination parameters and AML (Angle Minus Load) parameter are proposed to provide accurate estimates for characteristic lengths d0 and a0 for a given set of these parameters. The regression models used three or two lamination parameters or a single parameter AML. They were applied to experimental results of six different laminate families including three hybrid laminates. The modified average bearing stress criterion (ABSC) outperformed the modified point bearing stress criterion (PBSC) in all cases. The results of the ABSC have a maximum discrepancy for the bearing strength of all laminate families of 2.77% and 1.91%, for the three and two parameters, respectively. The single parameter regression model using AML had a maximum discrepancy of 8.83%. All these results compare very favorably with the criteria proposed in the literature, including the AML regression that had the worst accuracy. Therefore, these criteria together with the proposed surrogate models can be used to minimize the number of tests required for the aircraft development, being a good candidate for preliminary design.

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Section: Discussionmentioning

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Fracture criteria and surrogate models for bearing strength of mechanically fastened joints on hybrid composite laminates

Wallner,

Almeida

2023

Journal of Composite Materials

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“…Not only do the present criteria cover the plates with an infinite width (W/2C ≥ 6) that can be properly predicted by the original WN stress criteria, but they also provide better predictions of the tensile properties of plates with a finite width. According to the experimental results in [22], the predictive results of the WN stress criterion are found to be fairly poor, especially for structures involving finite-width straight slots with large holes [23][24][25]. In this present study, the failure mechanism and residual strength of the laminates with straight notches are explored based upon experimental and analytical methods.…”

Section: Introductionmentioning

confidence: 94%

A New Stress-Based Formulation for Modeling Notched Fiber-Reinforced Laminates

et al. 2022

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Laminated plates are often modeled with infinite dimensions in terms of the so-called Whitney–Nuismer (WN) stress criteria, which form a theoretical basis for predicting the residual properties of open-hole structures. Based upon the WN stress criteria, this study derived a new formulation involving finite width; the effects of notch shape and size on the applicability of new formulae and the tensile properties of carbon-fiber-reinforced plastic (CFRP) laminates were investigated via experimental and theoretical analyses. The specimens were prepared by using laminates reinforced by plain woven carbon fiber fabrics and machined with or without an open circular hole or a straight notch. Standard tensile tests were performed and measured using the digital image correlation (DIC) technique, aiming to characterize the full-field surface strain. Continuum damage mechanics (CDMs)-based finite element models were developed to predict the stress concentration factors and failure processes of notched specimens. The characteristic distances in the stress criterion models were calibrated using the experimental results of un-notched and notched specimens, such that the failure of carbon fiber laminates with or without straight notches could be analytically predicted. The experimental results demonstrated well the effectiveness of the present formulations. The new formula provides an effective approach to implementing a finite-width stress criterion for evaluating the tensile properties of notched fiber-reinforced laminates. In addition, the notch size has a great effect on strength prediction while the fiber direction has a great influence on the fracture mode.

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“…Although Whiney and Nuismer model was developed for in-plane tensile loads, the equations could also be used in compression, assuring that the failure is not controlled by the global buckling of the plate [35,36]. However, not enough information has been found in the scientific literature which evaluates the applicability of Whitney and Nuismer model in notched laminates under compressive loads.…”

Section: 𝒅 𝒐 𝒂 𝒐mentioning

confidence: 99%

Design tool to predict the open-hole failure strength of composite laminates subjected to in-plane loads

Moure

Herrero-Cuenca²,

García-Castillo

et al. 2020

Composite Structures

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Novel criteria for strength predictions of open-hole composite laminates for preliminary design

Cited by 10 publications

References 37 publications

Fracture criteria and surrogate models for bearing strength of mechanically fastened joints on hybrid composite laminates

Fracture criteria and surrogate models for bearing strength of mechanically fastened joints on hybrid composite laminates

A New Stress-Based Formulation for Modeling Notched Fiber-Reinforced Laminates

Design tool to predict the open-hole failure strength of composite laminates subjected to in-plane loads

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