Effect of Stress Ratio on Crack Extension Rate of Fine-Grained Isotropic Nuclear Graphite

Ishiyama, Shintarou; Eto, Minoru; Oku, Tatsuo

doi:10.1080/18811248.1987.9735871

Cited by 9 publications

(7 citation statements)

References 5 publications

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“…Hojo et al [16] followed a similar procedure and defined equivalent stress intensity range as given in Equations ( 5) and (6). By applying Equation (15) to strain energy release rate and using equivalent or effective strain energy release rate range concept, Equation ( 15) can take the following form Since G max is kept constant for a given load ratio, we can write G max ¼ ðÁGÞ=ð1 À RÞ to introduce ÁG in Equation ( 16) as…”

Section: Load Ratio Effectmentioning

confidence: 99%

“…However, when a graph was produced for crack growth rate da/dN versus the range of energy release rate ÁG, one single straight line was able to fit the data for all different load ratios. Ishiyama et al [15] used the fatigue threshold to explain the load ratio effects. They defined a threshold stress intensity factor range as 10 5 cycles below which no crack extension occurred.…”

Section: Introductionmentioning

confidence: 99%

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Study of Load Ratio for Mode-I Fatigue Fracture of Wood-FRP-Bonded Interfaces

Jia

Davalos

2004

Journal of Composite Materials

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This paper presents the fatigue behavior of interface bond between red maple wood and phenolic FRP substrates. Using linear elastic fracture mechanics concepts, the influence of load ratio on fatigue crack propagation rate is studied. A contoured double cantilever beam (CDCB) specimen is adopted in this study in order to obtain constant strain energy release rate independent of crack length. The compliance method is used for measuring the crack growth rate. A modified Paris Law equation based on strain energy release rate range, ÁG, and mean value of strain energy release rate, G mean , is proposed in this study for efficient evaluation of load ratio effect on fatigue crack propagation of the bonded interfaces. Follow-up environmental effects are being examined by means of the same energy parameters of the present study and without the need to consider crack closure. The proposed approach can further be extended to characterization of other bonded interfaces for dissimilar materials.KEY WORDS: contoured double cantilever beam (CDCB) specimen, crack propagation rate da/dN, load ratio R, crack opening displacement (COD), strain energy release rate.

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Section: Load Ratio Effectmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of Load Ratio for Mode-I Fatigue Fracture of Wood-FRP-Bonded Interfaces

Jia

Davalos

2004

Journal of Composite Materials

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“…Modifications of the Paris law equation, which represents the linear part of the crack growth rate vs. the applied strain energy release rate graph, have been proposed by a number of authors to incorporate load ratio effects [14][15][16][17][18][19][20][21]; however, most of these have been empirical, without physical interpretation. For example, Jia and Davalos [22] studied the mode-I fatigue behavior of a wood-FRP composite bonded interface using contoured DCB (CDCB) specimens.…”

Section: Introductionmentioning

confidence: 99%

Fatigue threshold and crack growth rate of adhesively bonded joints as a function of load/displacement ratio

Azari

Jhin

Papini

et al. 2014

Composites Part A: Applied Science and Manufacturing

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“…Moreover, the TDCB specimen, for which the strain energy release rate is independent of crack length, was proved suitable for fatigue test studies. Ishiyama et al (1987) studied the effect of stress ratio on crack extension rate of a fine-grained isotropic nuclear graphite. The tests were performed at a loading rate of 251 N/s with a tapered double cantilever beam (TDCB) specimen.…”

Section: Literature Reviewmentioning

confidence: 99%

“…They argued that the possible reasons for a high crack-opening stress in region A were that the slip band was blocked by the grain boundary and the crack path was on the crystallographic plane. Ishiyama et al (1987) defined a threshold stress intensity factor range ∆K th as the point below which the crack extension was less than 10 µm after 10 5 cycles of loading.…”

Section: Literature Reviewmentioning

confidence: 99%

Mode-I fatigue fracture of interface for fiber -reinforced polymer composite bonded to wood

Jia¹

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Mode-I Fatigue Fracture of Interface for Fiber-Reinforced Polymer Composite Bonded to Wood Junhui Jia For applications in civil infrastructure rehabilitation and new construction, wood is being reinforced with externally bonded laminates and fabrics of fiber-reinforced polymer (FRP) composites. The potential benefits of external reinforcement with bonded FRP composites have been demonstrated through several studies, and the field implementation of this technology has been successfully proven in numerous projects. However, there is a concern with the long-term performance of the interface bond, since an inadequate bond strength and integrity can render the reinforcement ineffective and lead to premature failure of the structure. The performance of FRP-wood bonded interfaces under static and environmental loads have been explored extensively at WVU, and as an extension of this effort, present study will examine, for the first time, the fatigue behavior of FRP-wood bonded interfaces. ACKNOWLEDGMENTS I would like to express my sincere gratitude and appreciation to Dr. Julio F. Davalos for his guidance and inspiration towards the completion of this research work. His constant support, trust, knowledge, patience and unselfishness have been invaluable to the progress of this work.

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Effect of Stress Ratio on Crack Extension Rate of Fine-Grained Isotropic Nuclear Graphite

Cited by 9 publications

References 5 publications

Study of Load Ratio for Mode-I Fatigue Fracture of Wood-FRP-Bonded Interfaces

Study of Load Ratio for Mode-I Fatigue Fracture of Wood-FRP-Bonded Interfaces

Fatigue threshold and crack growth rate of adhesively bonded joints as a function of load/displacement ratio

Mode-I fatigue fracture of interface for fiber -reinforced polymer composite bonded to wood

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