Weibull analysis of fatigue test in jute reinforced polyester composite material

The stress–strain characteristics and failure behavior of composites are strain rate dependent and affected by the fiber areal density. To elucidate the combined influence of areal density and strain rate on the strength of basalt fiber‐reinforced polymer composites (BFRP), an experimental study was conducted on BFRP laminates of two different fiber areal densities, that is, 380 GSM and 200 GSM, having distinct stacking sequence under three different loading rates. Failure modes, failure strength, and Weibull parameters were used to characterize the experimental outcomes. The experiment was carried out to investigate the mechanical responses and associated failure modes at strain rates ranging from quasi‐static 0.1 mm/min to a high strain rate of 10 mm/min. It has been demonstrated that there is a substantial correlation between the fiber areal density, loading rate, and stacking order of BFRP laminates and the increase in maximum flexural strength and interlaminar shear strength. For an increase in the fiber areal density from 200 GSM to 380 GSM flexural strength is increased by 18%–30%, while ILSS strength is increased by 30%–52%. Based on the finding, the asymmetric type‐2 laminate exhibits better properties than the symmetric and asymmetric type‐1 laminates due to the presence of more (0°/90°) laminae at the tensile side of the laminate. Inferring the mechanical characteristics of composite materials and their relationship to strain rate from experimental data required a statistical technique. The statistical analysis and experimental findings demonstrate that the shape parameter and linear coefficient are not reliant on the strain rate.

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“…The definition of the two‐parameter Weibull distribution analysis is given by. [ 45 ]

F (σ) = (\frac{β}{α}) \times {((), \frac{σ}{α})}^{β - 1} \times e^{- (\frac{σ}{α})}; σ \geq 0,

where,

F (σ)

is the probability of failure of the specimen. σ is measured stress.…”

Section: Resultsmentioning

confidence: 99%

Influence of fiber areal density on mechanical behavior of basalt fiber/epoxy composites under varying loading rates: An experimental and statistical approach

2023

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“…The DFR model is a set of theoretic equations that can be used to correct the S-N curve depending on the experimental data from the bench test. DFR hypothesizes that the fatigue life obeys the two-parameter Weibull distribution while the stress amplitude S a and fatigue life N vary with the inverse relationship in the long-life regime (N > 10 4 ) [16]. The equivalent life curves are straight lines and all of them intersect with the abscissa axis at S m0 (material parameter) in the long-life regime.…”

Section: The Corrected S-n Curve By the Dfr Methods Depending On The Beam Structurementioning

confidence: 99%

“…The longevity region is the life interval which distributed like Weibull with the cycle times between 10 4 -10 6 [16]. According to the DFR method, the linear relation between cycle times N and stress S a is, (0.47DFR) B + lg…”

Section: The Corrected S-n Curve By the Dfr Methods Depending On The Beam Structurementioning

confidence: 99%

Fatigue Models Based on Real Load Spectra and Corrected S-N Curve for Estimating the Residual Service Life of the Remanufactured Excavator Beam

Zhao

Xiao

Zhou

2021

Metals

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To more accurately predict the residual fatigue cycles and estimate the service life of the remanufactured excavator, the fatigue models integrating the corrected S-N curve, the RFC algorithm, the FEA model, and the mechanism dynamic model are established depending on the real load spectra under experimental working conditions and the corrected S-N curve of the beam metal remanufactured with the welding process. Depending on the test data of the unidirectional stress history and the servo displacements of the major cylinders, the mechanism dynamic model was first established to illustrate the real load spectra applied on the pivots of the working beam. The load spectra are further used in the finite element analysis (FEA) model to obtain the stress contours of the beam relevant to the sampling time, which is the stress spectra at any nodes on the beam in theory. Subsequently, the rain flow counting (RFC) algorithm based on the dual parameters of the cyclic stress amplitude and mean is established to provide the frequency spectra in the longevity region on the beam. Furthermore, due to the fatigue property changes of the beam metal remanufactured with the welding process, its S-N curve is corrected based on the detail fatigue rating (DFR) method to compute the stress cycles at each stress level on the crisis nodes. Finally, the total stress cycles that can be burdened by the remanufactured beam is computed under the Miner’s linear fatigue cumulative criterion. The total number of stress cycles is eventually converted to the fatigue and service life depending on the proportion of the sampling time under relevant working conditions. The results show that integrated fatigue models provide a practical approach to enhancing the accuracy of the estimation on the residual service life of the remanufactured excavator beam. It is significant for improving the reliability and safety of the remanufactured excavator.

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“…For composite materials, the Weibull distribution has been proved to be particularly suitable for describing the distribution of fatigue life. 27 Under a certain stress level S , the probability of fatigue life N is the survival rate P . Here, Weibull distribution was used to study the probability distribution of the tensile fatigue life of PFRC, and the P-S-N curves based on the three parameter Weibull distribution were developed.…”

Section: Fatigue Life Model Considering Dispersionmentioning

confidence: 99%

Tensile fatigue behaviour and life distribution model of the pultruded fibre reinforced composites

Zhang

Liu

Jiang

2022

Polymers and Polymer Composites

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Pultruded fibre reinforced composite (PFRC) can be used in oil drilling because of the corrosion resistance and energy conservation. The studies of fatigue behaviour and life distribution model are essential to the design and application of PFRC. In this paper, the tensile fatigue behaviour of PFRC was studied by the experiment combining with the acoustic emission technology, and the fatigue life distribution model is established to explore the distribution characteristics of fatigue life. The results show that, the fatigue load level has little effect on the failure modes of PFRC, and the matrix damage occurred firstly followed by the appearance of the delamination and the fibre damage. The proposed fatigue life distribution model can accurately describe the three stages of the fatigue life curve, and can well predict the fatigue life under different survival rates.

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Weibull analysis of fatigue test in jute reinforced polyester composite material

Cited by 25 publications

References 26 publications

Influence of fiber areal density on mechanical behavior of basalt fiber/epoxy composites under varying loading rates: An experimental and statistical approach

Influence of fiber areal density on mechanical behavior of basalt fiber/epoxy composites under varying loading rates: An experimental and statistical approach

Fatigue Models Based on Real Load Spectra and Corrected S-N Curve for Estimating the Residual Service Life of the Remanufactured Excavator Beam

Tensile fatigue behaviour and life distribution model of the pultruded fibre reinforced composites

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