Predicting fatigue damage in composites subjected to general loading conditions

Joosten, Mathew; Dávila, Carlos G.; Yang, Qingda

doi:10.1016/j.compositesa.2022.106862

Cited by 15 publications

(4 citation statements)

References 30 publications

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“…This refers to hysteresis loss. Permanent change in the microscopic structure decides the level of hysteresis loss 27–32 . Figure 7 illustrates the hysteresis loss ratio at various strain rates for both the homogeneous and graded rubbers.…”

Section: Resultsmentioning

confidence: 99%

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Hysteresis manifestation of graded rubber

Do,

Yamaguchi,

Washizu

et al. 2023

Polymers for Advanced Techs

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In the present study, hysteresis loss in the cyclic stress–strain curves of graded styrene–butadiene rubber (SBR) was compared with that of homogenously crosslinked SBR. The graded SBR was prepared by vulcanization in a temperature gradient, which provided a gradient of crosslink density in the thickness direction of the sheet. The graded SBR had a higher hysteresis loss ratio than the homogenously crosslinked SBR, even though they had similar Young's moduli. The large energy loss must be attributed to the viscous response of the low‐crosslink‐density side of the rubber sheet. After the unloading process, the graded rubber exhibited a large instantaneous residual strain. However, its actual residual strain was small after waiting for a long time, indicating good rubber elasticity, which was attributed to the elastic response of the high‐crosslink‐density side of the rubber.

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Section: Resultsmentioning

confidence: 99%

“…Permanent change in the microscopic structure decides the level of hysteresis loss. [27][28][29][30][31][32] Figure 7 illustrates the hysteresis loss ratio at various strain rates for both the homogeneous and graded rubbers. For the homogeneous rubbers, the hysteresis loss ratios of H130 were higher than those of…”

Section: Cyclic Stress-strain Curvesmentioning

confidence: 99%

Hysteresis manifestation of graded rubber

Do,

Yamaguchi,

Washizu

et al. 2023

Polymers for Advanced Techs

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“…The experimentally obtained fatigue sensitivity curves are necessary to build and verify residual mechanical properties prediction models. Some of them were proposed previously [47][48][49][50][51]. However, these models are often only suitable for a particular class of composite and require the definition of many parameters.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties Degradation of Fiberglass Tubes during Biaxial Proportional Cyclic Loading

et al. 2023

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Composite structures during an operation are subjected to various types of external loading (impact, vibration, cyclic, etc.), which may lead to a decrease in mechanical properties. Previously, many experimental investigations of the mechanical behavior of composites under uniaxial cyclic loading were carried out. Acquisition of new data on the reduction of composite materials’ mechanical characteristics under conditions of multiaxial cyclic loading, as well as verification of existing models for calculation of the residual properties, are relevant. Therefore, this work is devoted to the experimental investigation of the mechanical behavior of fiberglass tubes under proportional cyclic loading. Static and fatigue tests were carried out under tension with torsion conditions. Inhomogeneous strain fields were obtained using a non-contact optical video system VIC-3D. The structural damage accumulation processes were analyzed by an AMSY-6 acoustic emission signals recording system. Surface defects were determined using a DinoLite microscope. Residual dynamic elastic modules were calculated during fatigue tests, and fatigue sensitivity curves were built. Data was approximated using various models, and their high descriptive capability was revealed. Damage accumulation stages were determined. The dependence of the models’ parameters on a stress state were observed. It was concluded that multiaxial cyclic loading leads to a significant decrease in mechanical properties, which should be taken into account in composite structure design.

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“…Since it offers significant improvements in terms of economic and safety aspects, this monitoring is of great interest to the aerospace, civil, and mechanical industries [1]. The lightweight material is preferable in applications such as modern aircraft [2]. Glass fibre-reinforced polymer (GFRP) is one of the composite materials that is preferred in resin-based engineering applications such as aircraft, building, automotive parts and marines.…”

Section: Introductionmentioning

confidence: 99%

High-Cycle Fatigue Life Behaviour of Fabricated Glass Fibre-Reinforced Polymer

Loman,

Z.M. Hafizi,

F. Lamin

2023

Int. J. Automot. Mech. Eng.

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This study focuses on the fatigue behaviour analysis of glass fibre-reinforced polymer (GFRP) composite specimens under high-cycle fatigue loading conditions. Therefore, property validation is recommended in the material development process upon further investigation of the fabricated GRFP. This study aims to evaluate the behaviour of the fabricated GFRP fatigue specimen when subjected to high-cycle fatigue loads and compare it to existing studies. A GFRP fatigue test sample was fabricated using the hand layup process into a flat rectangular panel, which was then cut into a small dimension of 28×2×0.2 cm fatigue specimen. Fatigue tests were performed on five flat specimens at different constant amplitude loads or stress levels between 40% and 80% of ultimate tensile strength to obtain the stress–life curve for the fabricated GFRP. Results showed that the high-stress levels of 80% contributed to the most reduced fatigue life cycle of GFRP. This result is consistent with previous studies and lies within the published life cycle range, validating the fabricated GRFP. A new parameter called the failure modulus, or Mf, may be used to quantify a particular set of fatigue tests.

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Predicting fatigue damage in composites subjected to general loading conditions

Cited by 15 publications

References 30 publications

Hysteresis manifestation of graded rubber

Hysteresis manifestation of graded rubber

Mechanical Properties Degradation of Fiberglass Tubes during Biaxial Proportional Cyclic Loading

High-Cycle Fatigue Life Behaviour of Fabricated Glass Fibre-Reinforced Polymer

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