Data Scattering in Strength Measurement of Steels and Glass/Epoxy Composite

Catangiu, Adrian; Ungureanu, Dan Nicolae; Despa, Veronica

doi:10.1515/bsmm-2017-0002

Cited by 8 publications

(3 citation statements)

References 11 publications

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“…As several researchers have observed, when a composite component is subjected to flexural fatigue loading, there are three different stages in the degradation of stiffness. 15 , 24 , 25 As can be seen in Figure 7 , there is high rate of stiffness degradation at the first few thousand cycles (stage I). Then the second stage take place with slow gradual stiffness degradation, which covers a sizeable portion of the component life (stage II).…”

Section: Resultsmentioning

confidence: 96%

Experimental investigation of the flexural fatigue performance of plain woven basalt fiber/epoxy

Chhorn

Jung

2021

Science Progress

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Fatigue of composite materials is a very complex phenomenon, to date a numerous research effort is being spent on it. Because of deficiencies in study of flexural fatigue performance basalt fiber reinforced polymer (BFRP), the main objective of this work is to investigate the flexural fatigue performance of BFRP. The laminates of 4.0 mm average thickness were fabricated using the vacuum infusion technique. Three different stress levels of (162.90, 122.24, and 81.44) MPa were considered. A failure criterion was considered to be a 20% stiffness reduction of flexural fatigue test. Also, the stiffness reduction zones in the history of fatigue specimen were investigated. The failure mode of specimen at 20% reduction stiffness was inspected. The Weibull distribution function was used to obtain the failure probabilities and scatter. The S–N curve of composite laminates was constructed using five specimens at each number of cycles. This study indicated that under fatigue loading, the stiffness degradation process of composite materials was divided into three stages: the first is the high rate of stiffness degradation at the first few thousand cycles. The second stage then takes place with slow gradual stiffness degradation, which covers a sizeable portion of the component life. Finally, more grave types of damage occur, like fiber fracture, and induce complete material failure.

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Section: Resultsmentioning

confidence: 96%

Experimental investigation of the flexural fatigue performance of plain woven basalt fiber/epoxy

Chhorn

Jung

2021

Science Progress

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“…An approximate method for Weibull modulus estimation discussed in Appendix A found two sets of bridge cable wires, before service, having m values of 110 and 124. A recent study obtained an m value of 56 to 72 for stainless steels [25]. Bridge engineering guidelines [26] noted m of 70 for slightly corroded steel cable wires.…”

Section: Survey Of General Size Effectsmentioning

confidence: 99%

Size Effects of High Strength Steel Wires

Ono

2019

Metals

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This study examines the effects of size on the strength of materials, especially on high strength pearlitic steel wires. These wires play a central role in many long span suspension bridges and their design, construction, and maintenance are important for global public safety. In particular, two relationships have been considered to represent strength variation with respect to length parameters: (i) the strength versus inverse square-root and (ii) inverse length equations. In this study, existing data for the strength of high strength pearlitic steel wires is evaluated for the coefficient of determination (R2 values). It is concluded that the data fits into two equations equally well. Thus, the choice between two groups of theories that predict respective relationships must rely on the merit of theoretical developments and assumptions made.

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“…f (t) = f (t+T), where T is the period of repetition of the function [11][12][13][14]. A Fourier series is a sum of an infinite number of sinusoidal (sinus and cosine) functions -each with a frequency equal to a multiple of an integer of 1 / T, as in the following formula [13,14]:…”

Section: Using Analysis Based On Fourier Series Decomposingmentioning

confidence: 99%

Methods of Determining Sock Values and the Distance Between Axes of the Gearboxteething Using a Fitted Tooth Engagement

Stanciu

Gheorghe

2017

Scientific Bulletin of Valahia University - Materials and Mechanics

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Data Scattering in Strength Measurement of Steels and Glass/Epoxy Composite

Abstract: Abstract. The strength of materials is a complex function which involve two main components

Cited by 8 publications

References 11 publications

Experimental investigation of the flexural fatigue performance of plain woven basalt fiber/epoxy

Experimental investigation of the flexural fatigue performance of plain woven basalt fiber/epoxy

Size Effects of High Strength Steel Wires

Methods of Determining Sock Values and the Distance Between Axes of the Gearboxteething Using a Fitted Tooth Engagement

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