Thermo-mechanical stress analysis in platelet reinforced composites with bonded and debonded platelet end

Fattahi, A. M.; Moaddab, Elham; Bibishahrbanoei, N.

doi:10.1007/s12206-015-0427-0

Cited by 10 publications

(6 citation statements)

References 18 publications

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“…The in-plane shear strength F 6 is also a fracture mechanics problem. However, it can be approximated using Equation (16) if more experimental data is available for determining the F mS and C v factors. G A is the axial shear modulus of the fiber, which in the case of isotropic fibers is equal to G.…”

Section: Micromechanics For Predicting Strengthmentioning

confidence: 99%

“…Given the significant number of possible variations and the unmanageable number of experiments it will take to characterize them fully, researchers are looking for models that accurately predict the mechanical properties and failure behavior of FRAM. We can find models considering a physical interpretation of the stress state [16], numerical experiments [17,18], or raw experimental data for data-driven models [19]. In addition, some researchers are interested in knowing the physical and micromechanical composition of continuous-FRAM for a better physical description of the 3D printed material.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Models to Predict Mechanical Properties of FR-AM Composites and a Fractographical Study

2022

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Continuous fiber-reinforced additive manufacturing (cFRAM) composites improve the mechanical properties of polymer components. Given the recent interest in their mechanical performance and failure mechanisms, this work aims to describe the principal failure mechanisms and compare the prediction capabilities for the mechanical properties, stiffness constants, and strength of cFRAM using two distinct predictive models. This work presents experimental tensile tests of continuous carbon fiber AM composites varying their reinforced fraction, printing direction, and fiber angle. In the first predictive model, a micromechanical-based model for stiffness and strength predicts their macroscopic response. In the second part, data-driven models using different machine learning algorithms for regression are trained to predict stiffness and strength based on critical parameters. Both models are assessed regarding their accuracy, ease of implementation, and generalization capabilities. Moreover, microstructural images are used for a qualitative evaluation of the parameters and their influence on the macroscopic response and failure surface topology. Finally, we conclude that although predicting the mechanical properties of cFRAM is a complex task, it can be carried on a Gaussian process regression and a micromechanical model, with good accuracy generalized onto different process parameters specimens.

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Section: Micromechanics For Predicting Strengthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparison of Models to Predict Mechanical Properties of FR-AM Composites and a Fractographical Study

2022

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“…The stress concentration, at a certain point, causes a cohesion break of the thin layer of the matrix and the occurrence of a delamination fracture in a relatively large area. Local buckling and stress concentrations are characteristic phenomena occurring in laminated structures [ 63 , 64 ]. This is also the cause of buckling of the upper reinforcement layer and a rapid loss of a part of the load capacity by the beam.…”

Section: Resultsmentioning

confidence: 99%

Failure Progress of 3D Reinforced GFRP Laminate during Static Bending, Evaluated by Means of Acoustic Emission and Vibrations Analysis

Kozioł

Figlus

2015

Materials

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The work aimed to assess the failure progress in a glass fiber-reinforced polymer laminate with a 3D-woven and (as a comparison) plain-woven reinforcement, during static bending, using acoustic emission signals. The innovative method of the separation of the signal coming from the fiber fracture and the one coming from the matrix fracture with the use of the acoustic event’s energy as a criterion was applied. The failure progress during static bending was alternatively analyzed by evaluation of the vibration signal. It gave a possibility to validate the results of the acoustic emission. Acoustic emission, as well as vibration signal analysis proved to be good and effective tools for the registration of failure effects in composite laminates. Vibration analysis is more complicated methodologically, yet it is more precise. The failure progress of the 3D laminate is “safer” and more beneficial than that of the plain-woven laminate. It exhibits less rapid load capacity drops and a higher fiber effort contribution at the moment of the main laminate failure.

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“…For the study of the most used composites, those consisting of a matrix and reinforced with fibers, numerous studies have been carried out, and the results have been presented in numerous papers published in recent years [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ]. Other results related to the research of these types of problems are described in [ 26 , 27 , 28 , 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

Calculation of Homogenized Mechanical Coefficients of Fiber-Reinforced Composite Using Finite Element Method

Katouzian,

Vlase,

Itu

et al. 2024

Materials

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Determining the mechanical properties of a composite material represents an important stage in its design and is generally a complicated operation. These values are influenced by the topology and geometry of the resulting composite and the values of the elastic constants of the components. Due to the importance of this subject and the increasing use of composite materials, different calculation methods have been developed over the last fifty years. Some of the methods are theoretical, with results that are difficult to apply in practice due to difficulties related to numerical calculation. In the current paper, using theoretical results offered by the homogenization theory, values of engineering elastic constants are obtained. The finite element method (FEM) is used to determine the stress and strain field required in these calculations; this is an extremely powerful and verified calculation tool for the case of a material with any type of structure and geometry. In order to minimize errors, the paper proposes the method of least squares, a mathematical method that provides the best estimate for the set of values obtained by calculating FEM. It is useful to consider as many load cases as possible to obtain the best estimates. The elastic constants for a transversely isotropic material (composite reinforced with cylindrical fibers) are thus determined for a real case.

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Thermo-mechanical stress analysis in platelet reinforced composites with bonded and debonded platelet end

Cited by 10 publications

References 18 publications

Comparison of Models to Predict Mechanical Properties of FR-AM Composites and a Fractographical Study

Comparison of Models to Predict Mechanical Properties of FR-AM Composites and a Fractographical Study

Failure Progress of 3D Reinforced GFRP Laminate during Static Bending, Evaluated by Means of Acoustic Emission and Vibrations Analysis

Calculation of Homogenized Mechanical Coefficients of Fiber-Reinforced Composite Using Finite Element Method

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