Prediction of fatigue damage and life for composite laminates under service loading spectra

Lee, L.J.; Fu, K.E.; Yang, Jhen Hong

doi:10.1016/0266-3538(96)00043-7

Cited by 53 publications

(25 citation statements)

References 13 publications

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“…More than 5% reduction in stiffness is considered as failure as per prevailing design concept. Similar stiffness degradation under service loads has been observed in CFC material [12,13,14]. Results of low to high block loading at 6500με level (C3) can be seen Fig.…”

Section: Fatigue Testssupporting

confidence: 76%

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Investigation of the load sequence effects in fatigue of damaged composite laminate & characterization of fatigue damage

Duragkar

Paretkar

Peshwe

et al. 2010

Trans Indian Inst Met

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Carbon fiber reinforced composites are widely used today in various areas and specially in aerospace industry for structural applications. This investigation focuses on the effect of different load sequencing and impact damage on the fatigue behaviour of CFC laminates. The specimens made from plain CFC laminates and low energy impact damaged CFC laminates were subjected to a typical flight block loading sequence and the fatigue strength degradation was monitored through stiffness measurement using load displacement data obtained during block loading. Three different stress/ strain levels were used in testing. All the tests were performed using a computer controlled 100 kN servo-hydraulic test machine in load mode at room temperature and in lab air atmosphere on undamaged and low energy impact damaged composite laminates. Fatigue tests were performed with a sinusoidal waveform at 3 Hz. It was observed that lower strain levels did not show any significant effect on the fatigue properties in both the type of loading i.e. low to high and in high to low block loading in case of both the undamaged and impact damaged CFC specimens. Significant .reduction in stiffness was seen at higher strain level i.e. 6500me in both the undamaged and impact damaged CFC specimens . The low energy impact damaged specimens showed early failure at higher strain levels compared to undamaged specimens. The specimens were observed to have delaminated in the high stress fatigue cycling. The observed stiffness reduction due to fatigue cycling and the presence of delamination provide a means of macroscopic identification of fatigue strength degradation in composite materials. The energy plots appear useful tool to assess the damage growth.

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Section: Fatigue Testssupporting

confidence: 76%

“…The third region is characterized by a sharp stiffness reduction leading to fracture. Experimental results, demonstrate that the variations of third region are large for the specimens subjected to compressive dominated spectrum loads [12]. Some materials exhibit large stiffness reduction in the third region but some do not.…”

Section: Fatigue Testsmentioning

confidence: 96%

Investigation of the load sequence effects in fatigue of damaged composite laminate & characterization of fatigue damage

Duragkar

Paretkar

Peshwe

et al. 2010

Trans Indian Inst Met

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“…The stiffness degradation model is much more applicable to the practical design of composite structures. There are several models pertaining to stiffness degradation, developed by various researchers [6][7][8][9][10][11][12][13][14].…”

Section: Stiffness Degradation Model To Predict Residual Stiffnessmentioning

confidence: 99%

Stiffness degradation model for biaxial braided composites under fatigue loading

Tate

Kelkar

2008

Composites Part B: Engineering

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“…The load vs. displacement data for one complete fatigue cycle was analysed at regular intervals during the fatigue test, and the sample stiffness was calculated [11]. 50 points of load/displacement data in the central position of the rising half of the fatigue cycle were used to perform the regression analysis.…”

mentioning

confidence: 99%

Influence of nanorubber toughening on the tensile deformation and tensile fatigue behaviour of a carbon fibre-reinforced epoxy composite

Özdemir

Zhang

Hadavinia

et al. 2015

Journal of Composite Materials

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This study investigates the effect of nano carboxylic acrylonitrile butadiene rubber (CNBR-NP) on the tensile fatigue behaviour of carbon fibre reinforced polymer composites (CFRP) with dicyandiamide-cured epoxy matrix. The stress-controlled tension-tension fatigue behaviour at a stress ratio of R=0.1 was investigated for CFRP with neat and nanorubber-modified epoxy matrices with CNBR-NP loadings of 5, 10, 15, 20 phr. The normalised test data revealed that the high cycle fatigue lifetime of the epoxy resin modified with 15 phr of CNBR-NP was increased twice relative to the neat epoxy resin. Scanning electron microscopy (SEM) images of the fracture surfaces showed that the improved plastic deformation and energy dissipation at the fibre-matrix interface contributed towards the enhanced fatigue life of the CFRP.

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Prediction of fatigue damage and life for composite laminates under service loading spectra

Cited by 53 publications

References 13 publications

Investigation of the load sequence effects in fatigue of damaged composite laminate & characterization of fatigue damage

Investigation of the load sequence effects in fatigue of damaged composite laminate & characterization of fatigue damage

Stiffness degradation model for biaxial braided composites under fatigue loading

Influence of nanorubber toughening on the tensile deformation and tensile fatigue behaviour of a carbon fibre-reinforced epoxy composite

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