Influence of porosity and fibre coating on engineering elastic moduli of fibre-reinforced ceramics (SiC/SiC)

Peters, P.W.M.; Martín, E.; Pluvinage, P.

doi:10.1016/0010-4361(95)90410-2

Cited by 23 publications

(9 citation statements)

References 4 publications

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“…Depending on this process, a SiC/SiC composite may exhibit significant residual porosity (typically 10-15% for the CVI route) at the microscale (several micrometers) between fibers within the tows and at the mesoscale (i.e. a fraction of a millimeter) between plies [7]. Macro-pores are clearly visible in Fig.…”

Section: Introductionmentioning

confidence: 90%

A finite fracture model for the analysis of multi-cracking in woven ceramic matrix composites

Martín

Leguillon

et al. 2018

Composites Part B: Engineering

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:A finite fracture approach based on the Coupled Criterion is used to analyze multi-cracking in a woven ceramic matrix composite. In-situ micrographic observations obtained during tensile and bending tests performed on chemical vapor infiltrated SiC/SiC samples are utilized to identify cracking mechanisms. A two dimensional finite element model is generated to approximate the actual specimen section geometry including matrix, fiber tows and porosity. Numerical simulations are carried out with a dedicated algorithm to simulate nucleation and propagation of cracks. Comparing the simulation results with experimental ones shows that the model captures the main cracking features.

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Section: Introductionmentioning

confidence: 90%

A finite fracture model for the analysis of multi-cracking in woven ceramic matrix composites

Martín

Leguillon

et al. 2018

Composites Part B: Engineering

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“…In woven CMCs manufactured through the CVI process, the damage behavior is more complex due to tow undulation and crossing, porous intratow matrix, and large intertow voids. [9][10][11][12] Addressing this problem with a multiscale framework allows for the damage to be captured at the most relevant length scale (i.e., matrix constituent level) using a continuum damage mechanics based progressive damage model and the damage evolution tracked across the length scales through the use of state variables. A progressive American Institute of Aeronautics and Astronautics damage approach allows for subcells to continue carrying stress even after the initiation of damage, as opposed to other approaches that utilize maximum stress/strain or failure laws.…”

Section: Introductionmentioning

confidence: 99%

Ab Initio Micromechanics Based Multiscale Model of Woven Ceramic Matrix Composites

Borkowski

Chattopadhyay

2013

54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

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Multiscale models play a key role in capturing the inelastic response of woven carbon fiber reinforced ceramic matrix composites. Due to the mismatch in the thermal properties between the constituents of plain weave carbon fiber/silicon carbide composites, microcracks are present in the as-produced composite. Capturing the initial damage state of the composite requires the development of a multiscale thermoelastic constitutive damage model. The developed model is used to simulate the elastic and damage behavior of a plain weave C/SiC composite system under thermal and mechanical loads. It is shown to accurately predict the composite behavior and serves as a valuable tool in investigating the physics of damage initiation and progression and the evolution in effective composite elastic moduli as a result of temperature changes and damage. Nomenclature = coefficient of thermal expansion C = elastic stiffness tensor  = increment in coefficient of thermal expansion  eq = increment in equivalent strain e eq  = increment in equivalent elastic strain K 0 = increment in undamaged bulk modulus K = increment in instantaneous bulk modulus  = increment in damage variable  eq = increment in equivalent stress T = increment in temperature T = increment in change in temperature T = relative temperature change  = total strain tensor  = rate of change in strain tensor  eq / H = equivalent/hydrostatic strain 1 Graduate Research Associate, School of Engineering of Matter, Transport and Energy, Student Member, Luke.Borkowski@asu.edu 2 Professor, School of Engineering of Matter, Transport and Energy, AIAA Fellow Downloaded by ROKETSAN MISSLES INC. on February 8, 2015 | http://arc.aiaa.org | e eq  = equivalent/hydrostatic elastic strain  T = thermal strain tensor  = damage scalar f = damage potential  = damage variable (1-) I 1 = first invariant of the stress/strain tensor K 0 = undamaged bulk modulus K = instantaneous bulk modulus  = Poisson's ratio n = damage normalized secant modulus  = stress tensor  axial = fiber axial strength  axial = fiber transverse shear strength  crit / dam = critical hydrostatic stress value  eq / H = equivalent/hydrostatic stress T = temperature

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“…In cross-ply laminates, cracks in the transverse plies decrease the stiffness of the composite. 6,[12][13][14][15][16][17][18][19][20][21][22] For CMCs, this stiffness decrease is quite severe because the ceramic matrix has a similar or higher elastic modulus than the fiber. However, in CVI-manufactured plain-woven CMCs, the cracking behavior is more complex because of bundle waviness, cross-sectional shape of the bundles, porous matrix, and large voids between the infiltrated bundles.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Two Plain‐Woven Chemical Vapor Infiltrated Silicon Carbide‐Matrix Composites

Jacobsen

Brøndsted

2001

Journal of the American Ceramic Society

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The elastic and inelastic properties of a chemical vapor infiltrated (CVI) SiC matrix reinforced with either plainwoven carbon fibers (C/SiC) or SiC fibers (SiC/SiC) have been investigated. It has been investigated whether the mechanics of a plain weave can be described using the theory of a cross-ply laminate, because it enables a simple mechanics approach to the nonlinear mechanical behavior. The influences of interphase, fiber anisotropy, and porosity are included. The approach results in a reduction of the composite system to a fiber/matrix system with an interface. The tensile behavior is described by five damage stages. C/SiC can be modeled using one damage stage and a constant damage parameter. The tensile behavior of SiC/SiC undergoes four damage stages. Stiffness reduction due to transverse cracks in the transverse bundles is very different from cross-ply behavior. Compressive failure is initiated by interlaminar cracks between the fiber bundles. The crack path is dictated by the bundle waviness.For SiC/SiC, the compressive behavior is mostly linear to failure. C/SiC exhibits initial nonlinear behavior because of residual crack openings. Above the point where the cracks close, the compressive behavior is linear. Global compressive failure is characterized by a major crack oriented at a certain angle to the axial loading. In shear, the matrix cracks orientate in the principal tensile stress direction (i.e., 45°to the fiber direction) with very high crack densities before failure, but only SiC/SiC shows significant degradation in shear modulus. Hysteresis is observed during unloading/reloading sequences and increasing permanent strain.

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Influence of porosity and fibre coating on engineering elastic moduli of fibre-reinforced ceramics (SiC/SiC)

Cited by 23 publications

References 4 publications

A finite fracture model for the analysis of multi-cracking in woven ceramic matrix composites

A finite fracture model for the analysis of multi-cracking in woven ceramic matrix composites

Ab Initio Micromechanics Based Multiscale Model of Woven Ceramic Matrix Composites

Mechanical Properties of Two Plain‐Woven Chemical Vapor Infiltrated Silicon Carbide‐Matrix Composites

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