Very high cycle fatigue testing and behavior of GFRP cross- and angle-ply laminates

Adam, T.; Horst, Peter

doi:10.1007/978-3-658-24531-3_23

Cited by 5 publications

(8 citation statements)

References 30 publications

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“…Second, an evolution threshold was also identified in the S – N curve for the transition from HCF to VHCF. De‐laminations between the layers and transverse fractures were observed in the 90° fibers by Backe et al 11 There is an absence of a fundamental distinction in the damage mechanisms of VHCF and high‐cycle fatigue (HCF) 38,39 . The research findings indicate that fatigue damage mechanisms in composite materials under VHCF and HCF regimes are essentially identical, as comparable damage mechanisms were detected in both regimes.…”

Section: Introductionmentioning

confidence: 84%

“…3,23,25,37,142,174 The phenomena observed in UD laminates include matrix cracking and delamination, 3,9 while cross-ply laminates experience delamination and transverse cracking in 90 layers. 33,38,39,45,50,146,175 Angle-ply laminates experience delamination and matrix cracking, 176,177 quasi-isotropic laminates undergo delamination and matrix cracking, 31,32,140 and woven laminates undergo fiber-matrix de-bonding, matrix cracking, delamination, and transverse cracking. 11,135,178,179 Although all the mechanisms mentioned could potentially occur in various types of FRPs, only a subset of them is discussed in the papers about the VHCF regime test in UD USF.…”

Section: Fiber Angle Effectmentioning

confidence: 99%

“…47 Furthermore, fatigue behavior is influenced by the load ratio (tension-tension, tension-compression, and compression-compression), where compressive loading has been demonstrated to have a greater negative impact on HCF compared to tensile loading. 48,49 In the following, an extensive range of fatigue damage mechanisms, encompassing different material systems, fabrication configurations, and loading conditions, are discussed: i. De-bonding of fiber matrices and cracking of matrices 38,39,50 : Fiber-matrix de-bonding and matrix fracture are frequent initial damage mechanisms observed in the VHCF regime. Typically, matrix fracture commences within the 90 strata and advances along the breadth and thickness of the specimen.…”

Section: Introductionmentioning

confidence: 99%

“…The study proposed that GFRP angle-ply laminates may have a fatigue limit. 38,39 v. Fatigue tests on quasi-isotropic carbon/PEEK laminates: Michel et al 32 examined carbon/PEEK laminates that were quasi-isotropic under fatigue conditions. Observations included the initiation of delamination at unconstrained edges, a decline in rigidity, and the absence of a distinct fatigue limit.…”

Section: Introductionmentioning

confidence: 99%

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Very high cycle fatigue of fiber‐reinforced polymer composites: Uniaxial ultrasonic fatigue

Behvar,

Sojoodi,

Elahinia

et al. 2024

Fatigue Fract Eng Mat Struct

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This review explores uniaxial ultrasonic fatigue (USF) testing as a common and dependable method for quantifying the extended fatigue life of fiber‐reinforced polymer (FRP) composites. The objective is to explain the complexities governing the fatigue life behavior of FRPs, particularly in the realm of very high cycle fatigue (VHCF) where the number of loading cycles exceeds 107. To this end, this review encompasses the analysis of VHCF behavior, including the derivation and interpretation of stress–life (S–N) data, the evaluation of various fatigue damage mechanisms (i.e., controlling mechanisms of crack initiation and propagation) exhibited in FRP composites, and a thorough investigation of the frequency‐dependent effects on fatigue responses. Furthermore, this review tries to analyze the microscopic intricacies intrinsic to the VHCF failure of FRP composites, encompassing aspects such as fiber‐matrix de‐bonding, matrix cracking, and delamination, unveiling their modes and effects in a detailed manner. This review also underscores the pivotal integration of simulations, machine learning, and modeling techniques, emphasizing their crucial role in explaining both macroscopic and microscopic interactions governing the VHCF of FRPs.

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Section: Introductionmentioning

confidence: 84%

Section: Fiber Angle Effectmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Very high cycle fatigue of fiber‐reinforced polymer composites: Uniaxial ultrasonic fatigue

Behvar,

Sojoodi,

Elahinia

et al. 2024

Fatigue Fract Eng Mat Struct

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show abstract

“…Regarding the failure mechanisms, Adam and Horst [2,3,4,5] studied the behavior of GFRP laminates under loads up to 10 8 and found that damage mechanisms are the same for HCF and VHCF. Finally, Cavatorta [35] suggests that it exists a fatigue limit for carbonglass/epoxy: around 30% of the static limit, regardless fibre orientation or manufacturing process.…”

Section: Very High Cycle Fatigue (Vhcf)mentioning

confidence: 99%

Desarrollo e implementación de una formulación utilizando la teoría de mezclas serie/paralelo para la modelización de estructuras navales de materiales compuestos sometidas bajo cargas cíclicas

Jurado Granados

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The main goal of this thesis is the simulation of the performance of composite naval structures subjected to cyclic loads. The predicted behavior expected is the fatigue life of the composite structure, as well as the fatigue failure mechanisms. This achievement is conducted by coupling the serial/parallel mixing theory and a fatigue damage model. Consequently, the work has the following stages. In first place, a study is conducted in order to identify the failure mechanisms of composites in fatigue and how the different factors affect it, in order to propose a fatigue constitutive model for fibre and matrix. The review uses a constituent materials point of view, thus fatigue performance of fibres and resins are analyzed, as well as their role in each failure mechanisms. In addition, different variables that may affect fatigue behavior are described. Secondly, a numerical procedure for characterizing fibres and matrix is proposed, in order to predict the failure mechanisms in composites subjected to static loads. The procedure defines which experimental tests should be conducted and what material parameters are obtained from them. As a consequence, the material parameters of the constituent materials are defined, obtaining the failure of the composite by the failure of the constituent materials, without pre-defining the expected failure. The next stage is coupling the serial/parallel mixing theory and the fatigue model. The fatigue model modifies the constitutive equation of the components, while the rule of mixtures acts as a constitutive law manager. The fatigue models of fibre and matrix are characterized, assuming that the fatigue behavior of unidirectional laminates is driven by one of the constituents, in function of the loading direction. This methodology is validated for two different composite systems: a carbon epoxy cross-ply laminate and glass/polyester balanced angle-ply laminates. Finally, this numerical methodology is applied to two naval structures: a small section of a container ship and a flexible composite blade of a marine propeller. The two analyses obtain the failure mechanisms of both structures, as well as the ply or plies failing, and the corresponding constituent material causing the failure. One of the fatigue analyses is used in order to propose a simplified method capable of predicting the fatigue initiation in the structure, by only applying a quasi-static analysis. This method is based on comparing the maximum equivalent stress in the components with their SN fatigue curve. La tesis que se presenta tiene como objetivo la simulación de estructuras navales de materiales compuestos sometidas a cargas cíclicas. La simulación pretende predecir la vida a fatiga de la estructura, así como la obtención de los mecanismos de fallo que se producen. El medio por el que se pretende obtener dicho hito, es mediante el acoplamiento de la teoría de mezclas serie/paralelo y un modelo de daño de fatiga. Para ello, el trabajo sigue las siguientes fases. Primero, se ha realizado un estudio del estado del arte sobre los distintos mecanismos de fallo producidos en los materiales compuestos y su interacción entre ellos. Además, también se estudia el comportamiento de distintos tipos de refuerzo y matriz como materiales a granel sometidos a cargas cíclicas, es decir, sin reforzar o aglutinar. Esta parte sirve para conocer los mecanismos que se deben predecir y bajo qué condiciones se producen, así como identificar los factores que deben afectar al modelo de fatiga. Por último, esta primera parte realiza un esbozo del estado de arte actual en los métodos de predicción de la fatiga en materiales compuestos. En segundo lugar, se propone un procedimiento numérico para caracterizar la matriz y las fibras, con el fin de simular los distintos mecanismos de fallo de dos sistemas de materiales compuestos bajo cargas estáticas. El procedimiento propone los ensayos experimentales a realizar y qué parámetros de cada material se obtienen de ellos. Con este método, se consigue caracterizar los parámetros de los modelos constitutivos usados, sin necesidad de pre-definir el fallo del compuesto. En tercer lugar, se realiza el acople de la teoría de mezclas serie/paralelo con el modelo de fatiga. El modelo de fatiga modifica la ecuación constitutiva de los componentes, mientras que la teoría de mezclas serie/paralelo actúa de gestor de ecuaciones constitutivas. Para ello, se caracterizan los modelos de fatiga de los materiales constitutivos, asumiendo que el comportamiento a fatiga de los laminados unidireccionales está dominado por el comportamiento de unos de los componentes, en función de la dirección de carga. Dicho método se demuestra válido para dos sistemas de materiales compuestos diferentes: un laminado tipo cross-ply de carbono/epoxi, y otro de laminados de ángulos balanceados de vidrio/poliéster. Finalmente, el método se aplica a dos estructuras navales: una pequeña sección de un buque porta-contenedores y una hélice flexible. En ambas simulaciones se obtienen los diferentes mecanismos de fallo por los que falla cada una de las estructuras, así como el material componente que falla y la lámina correspondiente. Por último, el conocimiento aprendido se aprovecha para proponer un método simplificado que permita predecir la vida a fatiga de una estructura de compuesto sometida a cargas cíclicas. De esta manera, con un análisis cuasi-estático de las cargas máximas a las que se someten los materiales constituyentes y comparándolas con sus propias curvas SN, se puede verificar si la estructura presentará inicio de fallo por fatiga.

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Very high cycle fatigue assessment of thermoplastic-based hybrid fiber metal laminate by using a high-frequency resonant testing system

Mrzljak,

Trautmann,

Wagner

et al. 2024

International Journal of Fatigue

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Very high cycle fatigue testing and behavior of GFRP cross- and angle-ply laminates

Cited by 5 publications

References 30 publications

Very high cycle fatigue of fiber‐reinforced polymer composites: Uniaxial ultrasonic fatigue

Very high cycle fatigue of fiber‐reinforced polymer composites: Uniaxial ultrasonic fatigue

Desarrollo e implementación de una formulación utilizando la teoría de mezclas serie/paralelo para la modelización de estructuras navales de materiales compuestos sometidas bajo cargas cíclicas

Very high cycle fatigue assessment of thermoplastic-based hybrid fiber metal laminate by using a high-frequency resonant testing system

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