Study on mode-I fracture toughness of composite laminates with curved plies applied by automated fiber placement

Liu, Chen; Bai, Ruixiang; Lei, Zhenkun; Di, Jianyu; Dong, Dili; Gao, Tiancheng; Jiang, Hao; Chen, Yan

doi:10.1016/j.matdes.2020.108963

Cited by 18 publications

(7 citation statements)

References 45 publications

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“…Generally speaking, the MRCC is formulated for components with simple structure and small size. 31 In the case of the large-scale stiffened panel, a two-dwell curing cycle has been considered based on the MRCC of the EH104 in this paper. Under the initial curing cycle shown in Figure 9 and Table 2, the maximum temperature difference within the T-stiffened panel on the traditional mold is about 43.47°C while on the bionic mold proposed by authors in the previous work 24 is about 36.08°C, which is improved by 7.39°C.…”

Section: Optimization Of the Curing Cycle Parametersmentioning

confidence: 99%

Optimization of the curing cycle for the large-scale composite stiffened panel based on the response surface methodology and Fgoalattain algorithm

Wang

et al. 2022

Journal of Composite Materials

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The autoclave curing process of the large-scale composite stiffened panel greatly affects the manufacturing quality of the component, especially the curing quality of stiffeners and the bonding quality between stiffeners and the panel. In this paper, a multi-objective optimization method is developed to optimize the curing cycle for the composite T-stiffened fuselage panel, which aims to minimize the temperature difference within the component to achieve better forming quality. The autoclave curing model considering thermal properties of composites is established and verified by the experiment first. The response surface models are then built up with the Finite Element Method (FEM) and the Box-Behnken Design (BBD). The fgoalattain algorithm is applied to solve the multi-objective optimization problem with nonlinear constraints. Results show that the maximum temperature difference of the two groups of monitoring points decreases by 22.91% and 21.42%, respectively. Besides, the total curing time is also reduced by 11 mins.

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Section: Optimization Of the Curing Cycle Parametersmentioning

confidence: 99%

Optimization of the curing cycle for the large-scale composite stiffened panel based on the response surface methodology and Fgoalattain algorithm

Wang

et al. 2022

Journal of Composite Materials

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“…Use of paper ruler are existed in several similar studies as well. 12,[17][18][19] The tensile force is applied with the help of piano hinges fastened to one end of the specimen. Shimadzu AGS-J 10 kN equipped with a CCD camera is employed for recording force-displacement data continuously (Figure 2).…”

Section: Mode I Interlaminar Fracture Toughness Testmentioning

confidence: 99%

Parametric and non-parametric tests for the evaluation of interlaminar fracture toughness of polymer composites

Yavuz

Utku

2020

Journal of Reinforced Plastics and Composites

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This study is based on the statistical analysis of interlaminar fracture toughness of various laminated polymer composites used in aerospace applications through parametric and non-parametric tests. Tukey’s, Dunkan’s, two-sample t-test, and Kolmogorov–Smirnov tests are used to analyze tensile mode interlaminar fracture toughness of various fiber-reinforced polymer composites obtained by beam theory, modified beam theory, and modified compliance calibration method. Among the studied composite samples, modified compliance calibration method provided the highest average interlaminar fracture toughness, whereas the modified beam theory showed the lowest one. Room temperature cured carbon fiber-reinforced composite samples exhibited higher interlaminar fracture toughness than the autoclave cured samples. Two-sample t-test show that all methods are found coherent with each other in terms of being significantly different. On the contrary, Kolmogorov–Smirnov test revealed no significant difference. Besides, Tukey’s and Duncan’s tests exhibited almost the same results in regard to significant differences except those obtained by the modified compliance calibration method. Two-sample t-test method should have to be performed in order to observe significant relations rather than Kolmogorov–Smirnov test, since the results of Tukey’s and Duncan’s tests are only consistent with each other for the beam theory and modified beam theory method.

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“…Another line of work in this eld analyzes under different bre orientations of the composite material [39], also the behaviour of adhesive joints in composite materials subjected to different degradation processes such as humidity and its effects on the delamination process under pure fracture modes [40], exposure to a saline environment [41,42], freezing and thawing [43], water absorption in joints with hybrid composite materials [44], the effects of temperature [45][46][47] and the combination of the effects of humidity and temperature [48][49][50].…”

Section: Introductionmentioning

confidence: 99%

Study of the fatigue delamination behaviour of adhesive joints in carbon fibre reinforced epoxy composites, influence of the period of exposure to saline environment

Argüelles

Viña

Vigón

et al. 2022

Preprint

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This work analyses the fatigue delamination and fracture stress behaviour under mode I of adhesive joints made on an epoxy matrix composite material with unidirectional carbon fibre reinforcement and a commercial epoxy-based adhesive. DCB type tests (for mode I) were used with the aim to quantify the influence of the period of exposure to a degradation process in a salt spray chamber, to which the tested samples were subjected, on their fatigue behaviour. For this purpose and after a previous static characterisation of the material in which the critical values of the energy release rate for different exposure periods were determined, the levels of the energy release rate (ERR) to be applied in the fatigue tests and the exposure periods to be considered (no exposure, exposure during one week and twelve weeks) and a ratio of fatigue stress levels of R = Gmin/Gmax=0.1 were defined. From this experimental data, the G-N fatigue initiation curves and the G-da/dN growth curves were obtained. The experimental data obtained, in the fatigue initiation phase of the delamination process, have been treated by means of a probabilistic model based on a Weibull distribution, the application of models of these characteristics has allowed a better interpretation of the experimental results obtained. The most relevant result of the work is that, in general, the fatigue limits obtained for the adhesive joint, under mode I fracture, when subjected to a degradation process in a saline environment, do not translate into a relevant loss of its resistance capacity against this fatigue delamination phenomenon, in its initiation phase. On the other hand, the crack growth rates of the material subjected to different periods of exposure to a saline environment are similar and higher than those obtained for the material without exposure.

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Study on mode-I fracture toughness of composite laminates with curved plies applied by automated fiber placement

Cited by 18 publications

References 45 publications

Optimization of the curing cycle for the large-scale composite stiffened panel based on the response surface methodology and Fgoalattain algorithm

Optimization of the curing cycle for the large-scale composite stiffened panel based on the response surface methodology and Fgoalattain algorithm

Parametric and non-parametric tests for the evaluation of interlaminar fracture toughness of polymer composites

Study of the fatigue delamination behaviour of adhesive joints in carbon fibre reinforced epoxy composites, influence of the period of exposure to saline environment

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