Micro-mechanical aspects of asperity-controlled friction in fiber-toughened ceramic composites

Carter, W.C.; Butler, E.P.; Fuller, Edwin R.

doi:10.1016/0956-716x(91)90095-i

Cited by 71 publications

(11 citation statements)

References 4 publications

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“…Debond events were only apparent for the epoxy and Portland cement matrices containing an SCS-6 and/or steel fiber. This is particularly inconsistent with data provided by other researchers for the axially loaded testing of SiC/borosilicate glass specimens [2,6]. Some of their research suggested noticeably higher peak stress Efforts to physically measure fiber out-of-roundness were inconclusive due to resolution limitations of the TEM microscope employed.…”

Section: Resultsmentioning

confidence: 59%

“…Poisson effects and a changing contact area create nonlinear variations that must be considered in debond and friction calculations for axially loaded tests. In fact, analytical models have been offered to accommodate these variations [1,2,5,6]. However, significant and unpredictable excursions of these variations may be caused by random surface anomalies at the interface.…”

Section: Introductionmentioning

confidence: 99%

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Fiber Twist Test: A New Test Technique to Measure Composite Interface Properties

Chepolis

Ertürk

1994

MRS Proc.

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This paper discusses the work accomplished, thus far, in the development of the Fiber Twist Test (FTT) as an alternative and improved technique for testing the interface properties of continuous fiber composite materials. The unique features of the fiber twist test include the absence of Poisson effects during testing. This eliminates the nonlinear variation, with changing embedded fiber lengths, of fracture modes and accompanying debond energy, and of friction along the interface. Since the fiber is not removed from its surrounding matrix during testing, the interface area remains constant. This facilitates a more accurate measurement of friction properties at the interface.

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Section: Resultsmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Fiber Twist Test: A New Test Technique to Measure Composite Interface Properties

Chepolis

Ertürk

1994

MRS Proc.

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“…Sapphire-NiAl composites. The fiber push-out test has been used to measure interface strength in a variety of fiber-reinforced materials such as SiC /Ti, glass/ TiAl, sapphire/ Nb, sapphire/ NiAl and SiC/Si 3 N 4 composites [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45]. In this test, a fiber embedded within a matrix is loaded in compression using a microindentor, and the load required for interfacial debonding and sliding is measured as a function of the displacement.…”

Section: Interface Strength and Decohesion Behaviormentioning

confidence: 99%

Interface response to solidification in sapphire-reinforced Ni-base composites

Asthana¹,

Tewari²

2000

Advanced Composite Materials

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Controlled solidification of sapphire-NiAl and sapphire-Hastelloy composites was carried out to evaluate the influence of processing and alloying on the microstructure, chemistry, and interface and fiber strengths. Pressure casting, gravity casting, and zone directional solidification (DS) techniques were used to synthesize the composites. Both gravity casting and DS yielded higher interfacial shear strength in the composites compared to the solid-state powder cloth (PC) techniques. Large columnar β-NiAl grains surrounding the fibers in the DS material decreased the propensity for interfacial decohesion, resulting in a higher interface strength than in fine, equiaxed grains of gravity cast and PC composites. Alloying of NiAl matrix with Cr, W and Yb increased the interface strength relative to unalloyed NiAl but led to fiber degradation, with Yb causing the most extensive fiber damage. Pressure casting is viable to make high fiber volume fraction sapphire-reinforced Nibase composites; however, fibers suffer strength loss (about 65 pct. relative to the virgin fiber) due to chemical attack. The residual fiber strengths are consistent with a Weibull distribution function. Controlling the strength-limiting reactions by matrix modification, use of barrier coatings, and process control (e.g. reduced temperatures) would permit exploitation of the unique potential of solidification techniques to design the composites for toughening and strengthening.

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“…criterion for fiber fracture have been carried out on two [90,0]. criterion for fiber fracture have been carried out on two [90,0].…”

Section: Load-bearing Ply Fracture Analysis Using Pam-fisstmmentioning

confidence: 99%

“…The importance of asperity-induced friction during fiber sliding has prompted activity in the modification of existent numerical analyses to incorporate the effects of interface topography on the modeling of progressive fiber debonding and sliding [90,[94][95][96]. Some of these models have been modified to consider two situations: (1) when the sliding distances are longer that the typical wavelength of the interface topographical features, and (2) when the sliding distances are shorter than the typical wavelength of the interface topographical features.…”

Section: Effects Of Interface Topography On Fiber Slidingmentioning

confidence: 99%

Numerical Analysis and Modelling of Composite Materials

Bull¹

1996

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Micro-mechanical aspects of asperity-controlled friction in fiber-toughened ceramic composites

Cited by 71 publications

References 4 publications

Fiber Twist Test: A New Test Technique to Measure Composite Interface Properties

Fiber Twist Test: A New Test Technique to Measure Composite Interface Properties

Interface response to solidification in sapphire-reinforced Ni-base composites

Numerical Analysis and Modelling of Composite Materials

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