Multiple matrix cracking in a fiber-reinforced titanium matrix composite under high-cycle fatigue

Walls, D.P.; McNulty, John C.; Zok, Frank W.

doi:10.1007/bf02651939

Cited by 14 publications

(8 citation statements)

References 18 publications

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“…During to predict ⌬ mmc , the stress range below which multiple the growth of the crack through the composite, if the maximatrix cracking is favored, as follows: mum stress carried by the fibers is equal to their strength, they will fracture and crack will accelerate again, ultimately ⌬ mmc ϭ ⌬ th Ȋ a 0 ϭt c , fϭf [10] leading to specimen fracture. If not, the crack will arrest eventually and a new crack will start at another favorable site.…”

Section: Multiple Matrix Cracking Regimementioning

confidence: 99%

“…[6][7][8][9][10][11][12][13] Fiber bridging is effective in preventing catastrophic failure of the TMC component and enhancing STRUCTURAL components made of silicon-carbide its fatigue life. However, in the case of selectively reinforced fiber-reinforced titanium matrix composites (TMCs) have composites, it is possible for the multiplicity in matrix crackattractive stiffness, strength, and creep-resistance charactering to get entirely suppressed, leading to significant reducistics.…”

Section: Introductionmentioning

confidence: 99%

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Fatigue in selectively fiber-reinforced titanium matrix composites

Ramamurty

1999

Metall Mater Trans A

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Many applications of the Ti alloy matrix composites (TMCs) reinforced with SiC fibers are expected to use the selective reinforcement concept in order to optimize the processing and increase the costeffectiveness. In this work, unnotched fatigue behavior of a Ti-6Al-4V matrix selectively reinforced with SCS-6 SiC fibers has been examined. Experiments have been conducted on two different model panels. Results show that the fatigue life of the selectively reinforced composites is far inferior to that of the all-TMC panel. The fatigue life decreases with the decreasing effective fiber volume fraction. Suppression of multiple matrix cracking in the selectively reinforced panels was identified as the reason for their lack of fatigue resistance. Fatigue endurance limit as a function of the clad thickness was calculated using the modified Smith-Watson-Topper (SWT) parameter and the effective fiber volume fraction approach. The regime over which multiple matrix cracking occurs is identified using the bridging fiber fracture criterion. A fatigue failure map for the selectively reinforced TMCs is constructed on the basis of the observed damage mechanisms. Possible applications of such maps are discussed.

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Section: Multiple Matrix Cracking Regimementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fatigue in selectively fiber-reinforced titanium matrix composites

Ramamurty

1999

Metall Mater Trans A

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“…Multiple cracking is usually found in laminated composites (e.g., [31,32]). The problem of a periodic array of internal cracks has been modeled for a laminate composite system made of a central layer sandwiched by two layers of different materials.…”

Section: Resultsmentioning

confidence: 99%

Transverse cracking of orthotropic composite laminates: a fracture mechanics approach

Wang

Han

2009

Arch Appl Mech

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This research is concerned with the fracture mechanics of a laminated composite medium, which contains a central layer sandwiched by two outer layers. There is a periodic array of cracks in the central layer along the central axis of the medium. Fourier transform is used to reduce the problem to the solution of a system of dual integral equations, which are solved by the singular integral equation technique. Rigorous fracture mechanics analysis, which exactly satisfies all boundary conditions of the problem, is conducted. Numerical solutions for the crack tip field and the stress in the medium are obtained for various values such as crack length, crack spacing and layer thickness. Results are also given for the reduction of the equivalent Young's modulus of the laminate due to multiple cracking. The cases of axial extension and residual temperature change of the composite medium are accounted for.

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“…Careful stress and strain measurements allow to determine the changes in some stiffness characteristics (tangent modulus) of the loop, viz. 'Stiff-min +' at the start of loading and 'Stiff-max +' at the end of loading [23,25]. Both composites tested possess a strong non-linearity in the loading part of the stress-strain hysteresis loop (ratio 'stiffness max +' to 'stiffness min +') which is more significant for the composites based on untreated flax-fibers increasing with increasing load cycles.…”

Section: Fatigue Loading-dynamic Modulus Graphsmentioning

confidence: 93%

“…load, respectively, for composites with untreated and silicone treated flax-fibers (average weight gain = 41 wt%) is shown in Fig. 5 with definition of the characteristic values published in [23,25]. One can see that both moduli are in general lower in the case of composites containing silicone-sized fibers.…”

Section: Fatigue Loading-dynamic Modulus Graphsmentioning

confidence: 93%

Effect of silicone interphase on the mechanical properties of flax-polyurethane composites

Gassan¹,

Dietz²,

Błędzki³

2000

Composite Interfaces

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Flax fibers coated with two types and various amounts of silicones are used to make flax-polyurethane composites. Coating conditions have been found to affect strongly the composites properties. The effect of these two types and different amounts of silicone on the impact toughness, flexural strength and modulus, dynamic modulus and loss-energy and notch sensitivity is determined. These properties are compared with results of composites with a strong fiber-matrix adhesion.

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Multiple matrix cracking in a fiber-reinforced titanium matrix composite under high-cycle fatigue

Cited by 14 publications

References 18 publications

Fatigue in selectively fiber-reinforced titanium matrix composites

Fatigue in selectively fiber-reinforced titanium matrix composites

Transverse cracking of orthotropic composite laminates: a fracture mechanics approach

Effect of silicone interphase on the mechanical properties of flax-polyurethane composites

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