scholarly journals Evaluation of polymer matrix composite manufacturing routes for production of an oxide/oxide ceramic matrix composite

2021 ◽  
Author(s):  
Itsaso Echeverria Aparicio ◽  
David T. Fishpool ◽  
Virtudes Rubio Diaz ◽  
Robert A. Dorey ◽  
Julie A. Yeomans
Keyword(s):  
Matrix Composite ◽  
Polymer Matrix ◽  
Ceramic Matrix Composite ◽  
Ceramic Matrix ◽  
Polymer Matrix Composite ◽  
Oxide Ceramic ◽  
Composite Manufacturing

Life-Limiting Behavior of an Oxide/Oxide Ceramic Matrix Composite at Elevated Temperature Subject to Foreign Object Damage

2018 ◽  
Author(s):  
Michael J. Presby ◽  
Nesredin Kedir ◽  
Luis J. Sanchez ◽  
D. Calvin Faucett ◽  
Sung R. Choi ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Matrix Composite ◽  
Slow Crack Growth ◽  
Ceramic Matrix Composite ◽  
Ceramic Matrix ◽  
Constant Stress ◽  
Oxide Ceramic ◽  
Limiting Behavior ◽  
Alumina Oxide

The life-limiting behavior of an N720/alumina oxide/oxide ceramic matrix composite (CMC) was assessed in tension in air at 1200°C for unimpacted and impacted specimens. CMC targets were subjected to ballistic impact at ambient temperature with an impact velocity of 250 m/s under a full support configuration. Subsequent post-impact ultimate tensile strength was determined as a function of test rate in order to determine the susceptibility to delayed failure, or slow crack growth (SCG). Unimpacted and impacted specimens exhibited a significant dependency of ultimate tensile strength on test rate such that the ultimate tensile strength decreased with decreasing test rate. Damage was characterized using x-ray computed tomography (CT), and scanning electron microscopy (SEM). A phenomenological life prediction model was developed in order to predict life from one loading condition (constant stress-rate loading) to another (constant stress loading). The model was verified in part via a theoretical preloading analysis.

Life-Limiting Behavior of an Oxide/Oxide Ceramic Matrix Composite at Elevated Temperature Subject to Foreign Object Damage

2018 ◽  
Vol 141 (3) ◽  
Author(s):  
Michael J. Presby ◽  
Nesredin Kedir ◽  
Luis J. Sanchez ◽  
D. Calvin Faucett ◽  
Sung R. Choi ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Matrix Composite ◽  
Slow Crack Growth ◽  
Ceramic Matrix Composite ◽  
Ceramic Matrix ◽  
Constant Stress ◽  
Oxide Ceramic ◽  
Limiting Behavior ◽  
Alumina Oxide

The life-limiting behavior of an N720/alumina oxide/oxide ceramic matrix composite (CMC) was assessed in tension in air at 1200 °C for unimpacted and impacted specimens. CMC targets were subjected to ballistic impact at ambient temperature with an impact velocity of 250 m/s under a full support configuration. Subsequent postimpact ultimate tensile strength was determined as a function of test rate in order to determine the susceptibility to delayed failure or slow crack growth (SCG). Unimpacted and impacted specimens exhibited a significant dependency of ultimate tensile strength on test rate such that the ultimate tensile strength decreased with decreasing test rate. Damage was characterized using X-ray computed tomography (CT) and scanning electron microscopy (SEM). A phenomenological life prediction model was developed in order to predict life from one loading condition (constant stress-rate loading) to another (constant stress loading). The model was verified in part via a theoretical preloading analysis.

scholarly journals Mechanical characterisation of a fibre reinforced oxide/oxide ceramic matrix composite

2015 ◽  
Vol 35 (16) ◽  
pp. 4513-4520 ◽  
Author(s):  
D.T. Di Salvo ◽  
E.E. Sackett ◽  
R.E. Johnston ◽  
D. Thompson ◽  
P. Andrews ◽  
...  
Keyword(s):  
Matrix Composite ◽  
Ceramic Matrix Composite ◽  
Ceramic Matrix ◽  
Oxide Ceramic ◽  
Mechanical Characterisation

Fatigue behavior of double-edge notched oxide/oxide ceramic matrix composite in a combustion environment

2017 ◽  
Vol 51 (26) ◽  
pp. 3669-3683 ◽  
Author(s):  
Abhendra K Singh ◽  
Volodymyr Sabelkin ◽  
Shankar Mall
Keyword(s):  
Fatigue Limit ◽  
Matrix Composite ◽  
Fatigue Behavior ◽  
Ceramic Matrix Composite ◽  
Ceramic Matrix ◽  
Oxide Ceramic ◽  
Stiffness Reduction ◽  
Specimen Temperature ◽  
Double Edge ◽  
Combustion Environment

Tension–tension fatigue tests in a combustion environment were performed on double-edge notched oxide/oxide ceramic matrix composite specimens. The composite, designated as N720/A, constituted woven 0°/90° Nextel™720 fibers in alumina matrix. Monotonic tensile and cyclic loads at a frequency of 1 Hz and a stress ratio of 0.05 were applied on the specimens in a combustion environment. The maximum specimen temperature due to combustion flame impingement in the notch region was 1250 ± 50℃. A stiffness reduction of less than 10% evaluated for the run-out specimens showed the harsh combustion environment had a minimal effect on specimen degradation. The residual strength was evaluated to be ∼75%–85% the strength of non-fatigued (virgin) double-edge notch specimens in room temperature. The monotonic tensile strength and the fatigue limit for 90,000 cycles (run-out) were found to be ∼40 MPa less in the combustion environment when compared to published results for 1200℃ laboratory air environment. The damage mechanisms were also the same in the two environments. Finite element analyses showed that the reduction in strength and fatigue limit in the combustion environment (as compared to the laboratory air environment) was due to the presence of thermal gradient stresses because of non-uniform specimen temperature distribution.

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