Influence of Gradual Damage on the Structural Dynamic Behaviour of Composite Rotors: Simulation Assessment

Filippatos, Angelos; Langkamp, Αlbert; Gude, Μaik

doi:10.3390/ma11122453

Cited by 13 publications

(20 citation statements)

References 26 publications

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“…. (13) where σ is the stress derived from the constitutive equation of a lamina. The strain rate term is decomposed as…”

Section: Damage Dissipation Energymentioning

confidence: 99%

“…The FRP composites are essentially brittle with no plastic deformation, thus adequately described using a bilinear stress-strain curves with elastic and softening responses. The softening response represents the permanent deformation of the material, described through the continuous degradation of stiffness and strength to complete fracture [10][11][12][13]. The general loading on composite structures, including axial, flexural, and torsional loads, generates a complex stress state in the material.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An Energy-Based Concept for Yielding of Multidirectional FRP Composite Structures Using a Mesoscale Lamina Damage Model

et al. 2020

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Composite structures are made of multidirectional (MD) fiber-reinforced polymer (FRP) composite laminates, which fail due to multiple damages in matrix, interface, and fiber constituents at different scales. The yield point of a unidirectional FRP composite is assumed as the lamina strength limit representing the damage initiation phenomena, while yielding of MD composites in structural applications are not quantified due to the complexity of the sequence of damage evolutions in different laminas dependent on their angle and specification. This paper proposes a new method to identify the yield point of MD composite structures based on the evolution of the damage dissipation energy (DDE). Such a characteristic evolution curve is computed using a validated finite element model with a mesoscale damage-based constitutive model that accounts for different matrix and fiber failure modes in angle lamina. The yield point of composite structures is identified to correspond to a 5% increase in the initial slope of the DDE evolution curve. The yield points of three antisymmetric MD FRP composite structures under flexural loading conditions are established based on Hashin unidirectional (UD) criteria and the energy-based criterion. It is shown that the new energy concept provides a significantly larger safe limit of yield for MD composite structures compared to UD criteria, in which the accumulation of energy dissipated due to all damage modes is less than 5% of the fracture energy required for the structural rupture.

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“…. (13) where σ is the stress derived from the constitutive equation of a lamina. The strain rate term is decomposed as…”

Section: Damage Dissipation Energymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Energy-Based Concept for Yielding of Multidirectional FRP Composite Structures Using a Mesoscale Lamina Damage Model

et al. 2020

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“…As the damage evolution of composite materials can be modelled as a continuous process, it can be discretised to m states and considered as a sequence of these distinct states [ 26 ]. For each state, simulation models combined with damage mechanics models can also provide the damage-dependent structural dynamic behaviour [ 2 ]. In this way, two sequences with inter-dependent elements can be formed, a damage evolution sequence and a corresponding dynamic response sequence.…”

Section: Aspects For the Consideration Of Damage Evolution As A Sementioning

confidence: 99%

“…The development of innovative and efficient damage identification methods is a complex engineering challenge. It requires an interdisciplinary approach that uses simulation and information-based methods, which encompass the material and structural behaviour [ 2 ]. In this context, the understanding and analysis of the gradual damage behaviour and of the corresponding structural vibration response of composite rotors plays a central role.…”

Section: Introductionmentioning

confidence: 99%

“…Considering both experimental and numerical results [ 1 , 2 ], representative damage configurations are considered for the generation of input data to be utilised for the multi-level diagnostic model. The corresponding damage and vibration response sequences are formed to a diagnostic database in Section 4 and used as diagnostic input data.…”

Section: Introductionmentioning

confidence: 99%

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A Sequence-Based Damage Identification Method for Composite Rotors by Applying the Kullback–Leibler Divergence, a Two-Sample Kolmogorov–Smirnov Test and a Statistical Hidden Markov Model

Filippatos

Langkamp

Kostka

et al. 2019

Entropy

Self Cite

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Composite structures undergo a gradual damage evolution from initial inter-fibre cracks to extended damage up to failure. However, most composites could remain in service despite the existence of damage. Prerequisite for a service extension is a reliable and component-specific damage identification. Therefore, a vibration-based damage identification method is presented that takes into consideration the gradual damage behaviour and the resulting changes of the structural dynamic behaviour of composite rotors. These changes are transformed into a sequence of distinct states and used as an input database for three diagnostic models, based on the Kullback–Leibler divergence, the two-sample Kolmogorov–Smirnov test and a statistical hidden Markov model. To identify the present damage state based on the damage-dependent modal properties, a sequence-based diagnostic system has been developed, which estimates the similarity between the present unclassified sequence and obtained sequences of damage-dependent vibration responses. The diagnostic performance evaluation delivers promising results for the further development of the proposed diagnostic method.

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A comprehensive study of the flexural behaviour and damage evolution of composite laminates using a progressive failure model

idrissi

Seddouki

2023

Int J Adv Manuf Technol

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In this paper, a new progressive damage model has been established with the aim of predicting the exural behaviour and damage evolution of different composite laminates under three-point bending. In this proposed model, a progressive failure algorithm is developed for numerical analyses where the intra/interlaminar failure modes were considered for estimating the damage evolution. A set of gradual stiffness degradation rules were proposed to predict further damage evolution following damage initiation estimated by the combination of the three-dimensional Puck failure criteria and the cohesive zone model. The damage mechanics of composite laminates IMS194/CYCOM977-2 with ply sequence and AS4/PEEK with ply sequence are investigated by our proposed model. In addition, the present model's results were compared with those reported in the literature. Our ndings indicate that the proposed model accurately predicts the failure of laminates, which is bene cial to the study of the damage mechanism of composite laminates.these features are di cult to quantify and may not be possible to identify them at all [1]. The collapse of composite structures is part of a progressive degradation process. Furthermore, it is important to note that local failure causes load redistribution, allowing multiple failure mechanisms to emerge, which diminishes the strength of the composite structure, decreases the capacity of carrying the stress, and ultimately leads to global rupture of the composite. Moreover, it is di cult to accurately represent the stiffness behaviour of a bre carbon-reinforced polymer coupon due to numerous interacting aspects, such as treatment techniques, distribution and arrangement of the bres and matrix. On the other hand, exural testing leads to bene cial mechanical parameters for composite laminates, such as exural modulus and shear stress, as well as a better ability to comprehend and describe the cohesive inter-layer interactions. The advantage of three-point bending tests is that they have advantages in terms of specimen generation, they allow progressive tracking of specimen degradation to nal failure, the location of the failure is foreseeable, and they also allow validation of the strength of composite structures. Once a specimen is subjected to a bending load, the three basic stress states of the material are induced, namely tension, compression and shear. The failure of composite material is controlled mainly by one of the three basic stresses that will be the rst to attain its ultimate value. Parallel to this, previous studies of damage composites under bending load have assumed equal compressive and tensile responses, resulting in over-or underestimation of composite resistance. In order to improve the accuracy of the post-processing analysis and reduce effectively time and costs and exploit fully the pro ts of composite structures under different loads, more credible failure theories and damage propagation approaches are urgently required. M. A. Caminero et al [2]have carried out a three-point bending tes...

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Influence of Gradual Damage on the Structural Dynamic Behaviour of Composite Rotors: Simulation Assessment

Cited by 13 publications

References 26 publications

An Energy-Based Concept for Yielding of Multidirectional FRP Composite Structures Using a Mesoscale Lamina Damage Model

An Energy-Based Concept for Yielding of Multidirectional FRP Composite Structures Using a Mesoscale Lamina Damage Model

A Sequence-Based Damage Identification Method for Composite Rotors by Applying the Kullback–Leibler Divergence, a Two-Sample Kolmogorov–Smirnov Test and a Statistical Hidden Markov Model

A comprehensive study of the flexural behaviour and damage evolution of composite laminates using a progressive failure model

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