Ceramic matrix fibre composites: Mechanical testing and performance

Davidge, R. W.; Davies, J.R.

doi:10.1016/0267-3762(88)90057-4

Cited by 12 publications

(9 citation statements)

References 16 publications

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“…Summary of Results for SIC MatriX/SiC Fibers (RS)• Pre-exposed in air at1,OOO·C for 24 hours. of-magnitude change in strain rate at either temperature.…”

mentioning

confidence: 99%

Testing the tensile properties of ceramic-matrix composites

Woodford

Steele

Brehm

et al. 1993

JOM

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“…Summary of Results for SIC MatriX/SiC Fibers (RS)• Pre-exposed in air at1,OOO·C for 24 hours. of-magnitude change in strain rate at either temperature.…”

mentioning

confidence: 99%

Testing the tensile properties of ceramic-matrix composites

Woodford

Steele

Brehm

et al. 1993

JOM

View full text Add to dashboard Cite

“…Increased shearing effects for the 10 S:D ratio 20-mm span when comparing the 20 S:D ratio 40-mm span should therefore reduce mechanical properties, which were found for WOF, modulus, and flexural strength. Other researchers have previously indicated that S:D ratios greater than 20 are necessary when testing fiberreinforced composites [46,47].…”

Section: Fully-articulated Four-point Euler-type Flexural Testingmentioning

confidence: 99%

“…K IC has been advocated through many different configurations with a wealth of empirical formulas that include numerous flexural or bend testing as a form of "fracture toughness" measured in MPa m 1/2 [5,6]. The variety of test methods associated with uncertainty in terminology [18] and producing conflicting, contradictory results suggested that K IC was a specific comparative test option and not a true bulk material property [46][47][48]. The National Academy of Sciences through an important ceramics materials advisory board on hightemperature engines has even requested that limitations should be imposed on reporting K IC results [48].…”

Section: Introductionmentioning

confidence: 99%

“…Also, an extended span length to sample depth ratio of at least 16 per ASTM D 6272-00 standard for polymers (reinforced) has been recommended to reduce shearing effects through Euler-type bending conditions [45]. In fact, a span to depth ratio of 20 has been recommended for fiber-reinforced composites that are more susceptible to shear error [46,47], and more as anisotropy increases according to ASTM D 6272-00.…”

Section: Introductionmentioning

confidence: 99%

“…When considering K IC during flexural testing and artificial flaws extending mid-depth into a fiber-reinforced composite sample, the neutral plane has been shown to be a possible limiting barrier regarding crack propagation and fracture limits [10,11]. Span to depth ratios commonly suggested at four for many K IC tests, according to ASTM Standards [49], introduce enormous shear stress error [45][46][47]. As a result, correction factors for K IC can range from over 200 to 300% [49].…”

Section: Introductionmentioning

confidence: 99%

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Fracture toughness micromechanics by energy methods with a photocure fiber‐reinforced composite

2007

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A fracture toughness analysis for discontinuous fiber reinforcement was evaluated as a function of fiber volume percent (V f ) using advanced flexural bend tests. Fully articulated fixtures with 40-mm spans were used to examine specimens (2 × 2 × 50 mm 3 ) under conditions of Euler-type bending to reduce shearing effects. Testing for fracture toughness in standardized international units (kJ/m 2 ) using fundamental mechanics-of-materials energy methods by strain energy was then applied for assessment of resilience and work of fracture (WOF). Fracture toughness was also measured as strain energy release (SER IC ) for the condition of unstable fracture between peak load and 5% maximum deflection past peak load. Energies were calculated by numerical integration using the trapezoidal rule from the area under the load-deflection curve. Fracture depths were normalized using sample dimensions from microscopy imaging for a combined correlation matrix analysis of all mechanical test data. V f significantly correlated with resilience, WOF, and SER IC , but negatively correlated with degree of crack depth with p < 0.0000005. All measured interrelated properties also significantly correlated with one another (p < 0.000001). Significant fracture toughness differences between particulate-filled and fiber-reinforced composites began when adding fiber reinforcement at 10.3 V f for resilience, 5.4 V f for WOF, and 5.4 V f for SER IC (p < 0.05).

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Micromechanics for fiber volume percent with a photocure vinyl ester composite

2007

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Micromechanics for fiber volume percent () from 0.0 to 54.0 were conducted using (3 mm long × 9 µm diameter) high-purity quartz fibers in a visible-light vinyl ester particulate-filled photocure resin. MTS fully articulated four-point bend fixtures were used with a 40 mm test span and 50 × 2 × 2 mm sample dimensions. Specimens were tested following the combined modified ASTM standards for advanced ceramics ASTM-C-1161-94 and polymers ASTM-D-6272-00 for modulus, flexural strength, and yield strength. Experimental data provided reliable statistical support for the dominant fiber contribution expressed through the rule-of-mixtures theory as a valid representation of micromechanical physics. The rule-of-mixtures micromechanics described by could explain 92, 85, and 78% of the variability related to modulus, flexural strength, and yield strength respectively. Statistically significant improvements with fiber addition began at 10.3 for modulus, 5.4 for flexural strength, and 10.3 for yield strength, < 0.05. In addition, correlation matrix analysis was performed for all mechanical test data. An increase in correlated significantly with increases in modulus, flexural strength, and yield strength as measured by the four-point bending test, < 10. All mechanical properties in turn correlated highly significantly with one another, < 10.

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Ceramic matrix fibre composites: Mechanical testing and performance

Cited by 12 publications

References 16 publications

Testing the tensile properties of ceramic-matrix composites

Testing the tensile properties of ceramic-matrix composites

Fracture toughness micromechanics by energy methods with a photocure fiber‐reinforced composite

Micromechanics for fiber volume percent with a photocure vinyl ester composite

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