Fatigue Analysis of Continuously Carbon Fiber Reinforced Laminates

Gaier, Christian; Fischmeister, Stefan; Maier, Julia; Pinter, Gerald

doi:10.4271/2017-01-0327

Cited by 8 publications

(6 citation statements)

References 22 publications

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“…[ 18 ] In other words, the comparison of fractured surfaces was done at similar stress levels. [ 58 ] At the stress level of 0.9, the significant mechanisms of damage included fiber pullout as well as delamination and fiber fracture. Due to significant deterioration of the matrix/fiber interfaces, the transmission of loads from the matrix to the fibers in the concentrated damage zones was inhibited, which led to the resultant failure.…”

Section: Fatigue Damage Growthmentioning

confidence: 99%

Transverse fatigue behavior analysis of symmetric and asymmetric glass fiber‐reinforced laminates

Sharma

Singh

2023

Polymer Composites

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This study examined the effect of interchanging the position of (0°/90°) and (±45°) angle ply around the midplane of an eight‐layer symmetric [(0°/90°)/(±45°)2/(0°/90°)]s and asymmetric woven glass fiber reinforced composite laminate having [(0°/90°)/(±45°)2/(0°/90°)//(±45°)/(0°/90°)2/(±45°)] and (±45°)/(0°/90°)2/(±45°)//(0°/90°)/(±45°)2/(0°/90°) stacking sequence by means of flexure and fatigue test. The flexural and fatigue behavior of glass fiber–reinforced polymer (GFRP) laminates was analyzed as well. The GFRP laminates in varying stacking sequence having a volume fraction of 55 ± 0.9% were subjected to fatigue and damage analysis under stress levels ranging from 90% to 50% of their ultimate flexural strength at f = 1 Hz, R = 0.1. Flexure and fatigue testing was done in accordance with ASTM D790/D790‐17. The experiment results showed that the symmetric laminate with (0°/90°) ply at the compression and tension sides exhibited greater flexural strength (458.09 MPa) and fatigue lives as compared to the asymmetric A (352.70 MPa) and asymmetric B (272.89 MPa) laminates with (0°/90°) and (±45°) ply at the compression sides respectively. Microscopy and transmission light photography techniques were used to detect the damage behavior and capture the debond zone images. The correlation between the load‐deflection curve, Wohler‐curve, hysteresis loops, dynamic stiffness and debond zones was also examined with regard to different stacked laminates.

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Section: Fatigue Damage Growthmentioning

confidence: 99%

Transverse fatigue behavior analysis of symmetric and asymmetric glass fiber‐reinforced laminates

Sharma

Singh

2023

Polymer Composites

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“…As the fatigue test progresses, the cracks become larger and more interconnected, leading to a reduction in the stiffness, strength, and ductility of the material. 55 Additionally, the degradation of the fiber-matrix interface can also contribute to the reduction of the mechanical properties of the composite. 1,56 Fractographic study All specimens tested in fatigue showed failures within the acceptable region, that is, in the region between the equipment grips.…”

Section: After Infinite Life Inspectionmentioning

confidence: 99%

“…Montesano et al 54 conducted a fatigue test on a woven CF fabric embedded in a thermosetting polyimide resin and reported an infinite fatigue life between 60 and 65% of tensile strength for up to 10000000 (10 million) cycles at 10 Hz, with R=0.1. Feng et al 55 conducted a fatigue test under tension-tension conditions on CF/epoxy composite laminates. The test parameters included a frequency of 10 Hz, a stress ratio (R) of 0.1, and varying stress levels ranging from 65% to 90% of the average ultimate tensile strength, incremented by 5%.…”

Section: Fatigue Strength Testsmentioning

confidence: 99%

Fatigue and durability assessment of PA6-based carbon fiber composites for lightweight applications

Morgado,

Montagna,

Gouvêa

et al. 2023

Journal of Composite Materials

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The use of lightweight structural elements across various industries has seen significant progress due to the adoption of carbon fiber-reinforced polymers (CFRPs). Among these, polyamide 6 (PA6) stands out as a prevalent thermoplastic polymer, renowned for its exceptional processability, favorable mechanical attributes, and cost-effectiveness. These qualities position it as a compelling candidate for serving as a matrix material in CFRPs. Nevertheless, as these composites find application in the development of lightweight automotive components, there arises a need for a more comprehensive comprehension of their mechanical characteristics and responses under diverse loading scenarios, encompassing fatigue behavior. So, this study investigated the mechanical behavior of CFRP based on the PA6 matrix under tensile and fatigue loading. The volumetric fractions of CF, PA6 matrix, and voids of the CF/PA6 composites were determined by acid digestion analysis, and the values of 48%, 51.6%, and 0.4%, respectively, indicated the good quality of the studied laminate. Tensile tests showed good repeatability, and the results were used to establish fatigue limits at a ratio (R) of 0.1. Fatigue tests showed that the CFRP had an infinite life of 1 million cycles at a stress level of 75%. Fractographic analysis revealed that specimens tested at lower levels of fatigue had better fracture aspects compared to those tested at higher levels. These findings contribute to the understanding of the fatigue behavior of CFRP with PA6 matrix and provide insights for their potential use in applications for lightweight structures.

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“…Recently, some commercial programmes have integrated composite fatigue analysis tools based on fatigue-life models. For example, FEMFAT Laminate [7][8][9] offers fast fatigue analyses for composite structures. It is based on a static stress-field calculation and is limited to the prediction of the fatigue life.…”

Section: Introductionmentioning

confidence: 99%

Progressive Fatigue Modelling of Open-Hole Glass-Fibre Epoxy Laminates

Maneval,

Vedvik,

Echtermeyer

2023

J. Compos. Sci.

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The failure of composite laminates under cyclic fatigue loads is complex, as multiple failure mechanisms are in play at different scales and interact with each other. Predicting the remaining fatigue life as well as the residual capacities of a composite laminate or component is crucial, particularly for safety-critical applications. A progressive fatigue model is proposed to describe the catastrophic failure of open-hole laminates under tensile cyclic fatigue. To represent both intra-laminar and inter-laminar damage, a combination of a continuum damage mechanics model (CDM) and a discrete cohesive zone model (CZM) is implemented in the finite element (FE) software Abaqus. The CDM combines fibre- and matrix-dominated S-N curves with the Palmgren–Miner accumulation rule and Hashin’s residual strength to form a fatigue failure criterion differentiating between fibre failure (FF) and matrix failure (MF). The CZM implemented in this work is the CF20 model proposed by NASA. Fatigue cycling is simulated using an external cycle-jump scheme, where the stiffness degradation is conducted between the FE simulations outside of the implicit solver [90/0] s. Glass fibre reinforced polymer (GFRP) open-hole specimens were tested in tensile cyclic fatigue at a load ratio of 0.1. The experiments were reproduced numerically and the results compared. After calibration of a set of parameters based on one load level, the model was able to reproduce the experimental S-N curve very well, predicting a slope of −0.10, while the experimental value was −0.11. The failure sequence of the laminate was also successfully reproduced. The growth of the split from the hole, and its interaction with inter-laminar delamination, was successfully captured. The proposed approach was able to describe the fatigue failure of an open-hole laminate with a minimal set of material inputs using a simplified fatigue damage model while avoiding convergence issues.

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Fatigue Analysis of Continuously Carbon Fiber Reinforced Laminates

Cited by 8 publications

References 22 publications

Transverse fatigue behavior analysis of symmetric and asymmetric glass fiber‐reinforced laminates

Transverse fatigue behavior analysis of symmetric and asymmetric glass fiber‐reinforced laminates

Fatigue and durability assessment of PA6-based carbon fiber composites for lightweight applications

Progressive Fatigue Modelling of Open-Hole Glass-Fibre Epoxy Laminates

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