Numerical and experimental studies of the influence of curing and residual stresses on buckling in thin-walled, CFRP square-section profiles

Czapski, Paweł; Jakubczak, Patryk; Lunt, Alexander J.G.; Kaźmierczyk, Filip; Urbaniak, Mariusz; Kubiak, Tomasz

doi:10.1016/j.compstruct.2021.114411

Cited by 9 publications

(3 citation statements)

References 47 publications

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“…Maximum decrease in critical load occurred for a plate with an 8mm diameter hole was 13.5% (experimental tests) compared to a plate without a hole. In the final step, the FEM model was experimentally verified in the nonlinear state [52,53]. Nonlinear load-shortening characteristics were determined, allowing to determine the behaviour of the tested plate with a hole in the weak-postcritical state.…”

Section: Discussion Of Resultsmentioning

confidence: 99%

Influence of Size of Open Hole on Stability of Compressed Plate Made of Carbon Fiber Reinforced Polymer

Wysmulski,

Mieczkowski

2024

Adv. Sci. Technol. Res. J.

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This manuscript concerns the investigation of the influence of the open hole on stability of the compression plate made of carbon-epoxy composite. Experimental tests carried out on the real plate resulted in a postcritical path from which the critical load value was determined using appropriate approximation method. In parallel, an independent study was carried out based on a numerical analysis using the finite element method (FEM). Investigations were conducted in terms of a linear eigenproblem analysis, from which the value of the bifurcation load was determined for the FEM model of the plate. Its values resulting from the numerical analyses were validated against the experimental results, thus confirming the adequacy of the designed FEM model of the plate. The paper shows that the incremental increase of the hole in the plate monotonically influences the decrease in the critical load of the plate. The largest decrease was observed for the specimen with the largest hole analysed and was 13.5% compared to a plate without a hole. The newness of the paper is the application of interdisciplinary investigation methods to describe the influence of the open hole compression (OHC) on the stability of composite plates. ABAQUS® was used as the tool with which the numerical analyses were realised.

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Section: Discussion Of Resultsmentioning

confidence: 99%

Influence of Size of Open Hole on Stability of Compressed Plate Made of Carbon Fiber Reinforced Polymer

Wysmulski,

Mieczkowski

2024

Adv. Sci. Technol. Res. J.

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“…Many researchers have addressed the issue of local elastic buckling of composite structures in their studies [10,11]. One may also find papers supported by experimental results on the buckling of composite plate structures [12][13][14]. The static character of such structures allows the ability to carry the load further in the postbuckling state.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Effect of an Open Hole on the Buckling of a Compressed Composite Plate

Wysmulski

2024

Materials

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This paper investigates the effect of an open hole on the stability of a compressed laminated composite plate. The study was carried out in two ways: using experimental tests and numerical analysis. As a result of the experiment, the buckling form and path of the plate were recorded. The form of buckling was determined using the ARAMIS non-contact measurement system. The critical load value was determined from the working path using the approximation method. The experimental results were verified by numerical analysis based on the finite element method. FEM investigations were carried out in terms of a linear eigenproblem analysis. This allowed the bifurcation load and the corresponding buckling form of the numerical model of the plate to be determined. Investigating the effect of the hole in the compressed plate at a critical state showed high agreement between the proposed test methods. No clear effect of the hole size on the buckling of the plate was observed. In contrast, a clear effect of the hole on the critical load value was determined. The maximum decrease in the critical load value was 14%. The same decrease was observed for the stiffness of the post-critical characteristics. It was shown that the [45|−45|90|0]s composite plate had more than three times lower strength compared to [0|−45|45|90]s and [0|90|0|90]s. The novelty of this article is the development of a research methodology based on new interdisciplinary research methods for describing the influence of the central hole on the stability of compressed composite plates. The ABAQUS system was used for the numerical analysis.

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“…Therefore, results of experimental studies in a number of works are supplemented with the data obtained using the finite element modelling [42,43]. It allowed the authors to give some recommendations regarding the choice of optimal parameters for the repair process [44]. The paper [45] proposes a multiscale model for prediction of residual stresses of composites in the process of curing.…”

Section: Introductionmentioning

confidence: 99%

Effects of the Temperature–Time Regime of Curing of Composite Patch on Repair Process Efficiency

et al. 2021

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Repair procedures with the use of composite patches are considered to be the most effective among the current technologies of repair of the structures of various applications. In the process of moulding-on of a patch made of polymeric composite material by means of curing, technological stresses arise in the patch. Determination of residual technological stresses is a priority task for the modelling of the repair process. Reduction of residual stresses can be achieved by optimization of the mode of repair patch curing. For meeting this objective, the method for determination of technological stresses, which arise in the structure under repair in the process of curing of a composite patch, has been developed. The method takes into account the shrinkage, change in physico-mechanical characteristics, rheological processes occurring in the binder during moulding process, and determination of stresses in the structure under repair at any time. Therefore, premature failure of the repair joint at the stage of repair can be avoided. It is shown that the method adequately describes the level of deformations and stresses in the structure being repaired at the stage of heating and holding of the composite patch. Increase in the moulding temperature leads to a reduction in residual stresses in the structure under repair. However, current stresses at the stages of heating and temperature holding are increased significantly. Reliability of assumptions and developed method is confirmed by the comparison with the experimental data. The obtained experimental graph of total deformation of the composite patch allowed us to clearly determine the moment of residual stress occurrence in the structure under repair. This moment matches quite exactly (with the discrepancy not exceeding 5 min) the gel point determined analytically based on dependence of the degree of curing on the moulding mode. Consequently, the research together with the results previously obtained allows making an integrated choice of geometric parameters of the repair composite patch and temperature–time regime of its curing in order to ensure the specified level of strength and stiffness of the structure under repair.

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Numerical and experimental studies of the influence of curing and residual stresses on buckling in thin-walled, CFRP square-section profiles

Cited by 9 publications

References 47 publications

Influence of Size of Open Hole on Stability of Compressed Plate Made of Carbon Fiber Reinforced Polymer

Influence of Size of Open Hole on Stability of Compressed Plate Made of Carbon Fiber Reinforced Polymer

Analysis of the Effect of an Open Hole on the Buckling of a Compressed Composite Plate

Effects of the Temperature–Time Regime of Curing of Composite Patch on Repair Process Efficiency

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