Tensile Behavior of Sic\Sic Composites Reinforced by Treated Sylramic Sic Fibers

Yun, H. M.; Gyekenyesi, John P.; Chen, Y.L.; Wheeler, Donald R.; DiCarlo, James A.

doi:10.1002/9780470294680.ch60

Cited by 22 publications

(18 citation statements)

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“…These MI composites were produced both by GE CCP (Newark, DE) and by Goodrich (Santa Fe Springs, CA) with no significant difference in creep or rupture behavior for the same fiber-type. Some of the data used for comparison here is taken from other studies 15,[17][18][19][20] with appropriate references and some of the data are previously unpublished. The test methods and creep-rupture rig use for all composites of this study were identical to the referenced studies and are briefly described below.…”

Section: Methodsmentioning

confidence: 99%

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Tensile creep and rupture of 2D-woven SiC/SiC composites for high temperature applications

Morscher

2010

Journal of the European Ceramic Society

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Section: Methodsmentioning

confidence: 99%

“…This last type was developed by NASA using a proprietary heat treatment of the COIC/ATK Sylramic fiber. 9,15 Descriptions of these fiber-types can be found in Refs. 9 and 16.…”

Section: Introductionmentioning

confidence: 99%

Tensile creep and rupture of 2D-woven SiC/SiC composites for high temperature applications

Morscher

2010

Journal of the European Ceramic Society

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“…Thus besides scientific value, tensile testing of these panels in the primary fiber axis as well as in the off-axis directions should also have technical value in that it is a first step in understanding the mechanical and cracking effects of 2D fiber architectures and multi-directional stresses, such as thermal stresses, in these components. The primary room temperature properties of interest were the elastic modulus, the DFLS as measured by two off-set methods, the were then stacked and converted to Sylramic-iBN* fiber at NASA Glenn [5]. The 2D Sylramic-iBN stacks were then sent to GE Composites, Newark, DE, where they went through typical MI processing: CVI BN fiber coating, CVI SiC initial matrix, waterbased slurry SiC particle infiltration, drying, and liquid-Si infiltration [4].…”

Section: Introductionmentioning

confidence: 99%

In‐Plane Cracking Behavior and Ultimate Strength for 2D Woven and Braided Melt‐Infiltrated SiC/SiC Composites Tensile Loaded in Off‐Axis Fiber Directions

Morscher

Yun

DiCarlo

2007

Journal of the American Ceramic Society

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The tensile mechanical properties of ceramic matrix composites (CMC) in directions off the primary axes of the reinforcing fibers are important for architectural design of CMC components that are subjected to multi-axial stress states. In this study, 2D-woven melt- behavior, acoustic emission, and optical microscopy were used to quantify stressdependent matrix cracking and ultimate strength in the panels. It was observed that both off-axis loaded panels displayed higher composite onset stresses for through-thickness matrix cracking than the 2D-woven 0/90 panels loaded in the primary 0 o direction. These improvements for off-axis cracking strength can in part be attributed to higher effective fiber fractions in the loading direction, which in turn reduces internal stresses on critical matrix flaws for a given composite stress. Also for the 0/90 panel loaded in the 45 o direction, an improved distribution of matrix flaws existed due to the absence of fiber tows perpendicular to the loading direction. In addition, for the +67/0/-67 braided panel, the axial tows perpendicular to the loading direction were not only low in volume fraction, but were also were well separated from one another. Both off-axis oriented panels also showed relatively good ultimate tensile strength when compared to other offaxis oriented composites in the literature, both on an absolute strength basis as well as when normalized by the average fiber strength within the composites. Initial implications https://ntrs.nasa.gov/search.jsp?R=20070021762 2018-05-10T22:43:08+00:00Z 2 are discussed for constituent and architecture design to improve the directional cracking of SiC/SiC CMC components with MI matrices.

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“…1 CMC. This is attributed primarily to the in situ BN coating that protects the fibers from detrimental environmental effects introduced during processing [24]. The average proportional limit for Syl-iBN/[SiC+Si 3 N 4 ] was determined to be a high 144 MPa.…”

Section: Monotonic Tensionmentioning

confidence: 99%

Effects of Steam Environment on Fatigue Behavior of Two SiC/[SiC+Si3N4] Ceramic Composites at 1300°C

Ruggles‐Wrenn

Sharma

2010

Appl Compos Mater

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The fatigue behaviors of two SiC/[SiC+Si 3 N 4 ] ceramic matrix composites (CMC) were investigated at 1,300°C in laboratory air and in steam. Composites consisted of a crystalline [SiC+Si 3 N 4 ] matrix reinforced with either Sylramic™ or Sylramic-iBN fibers (treated Sylramic™ fibers that possess an in situ BN coating) woven in a five-harness satin weave fabric and coated with a proprietary boron-containing dual-layer interphase. The tensile stress-strain behaviors were investigated and the tensile properties measured at 1,300°C. Tension-tension fatigue behaviors of both CMCs were studied for fatigue stresses ranging from 100 to 180 MPa. The fatigue limit (based on a run-out condition of 2×10 5 cycles) in both air and steam was 100 MPa for the CMC containing Sylramic™ fibers and 140 MPa for the CMC reinforced with Sylramic-iBN fibers. At higher fatigue stresses, the presence of steam caused noticeable degradation in fatigue performance of both composites. The retained strength and modulus of all run-out specimens were characterized. The materials tested in air retained 100% of their tensile strength, while the materials tested in steam retained only about 90% of their tensile strength.

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Tensile Behavior of Sic\Sic Composites Reinforced by Treated Sylramic Sic Fibers

Cited by 22 publications

References 0 publications

Tensile creep and rupture of 2D-woven SiC/SiC composites for high temperature applications

Tensile creep and rupture of 2D-woven SiC/SiC composites for high temperature applications

In‐Plane Cracking Behavior and Ultimate Strength for 2D Woven and Braided Melt‐Infiltrated SiC/SiC Composites Tensile Loaded in Off‐Axis Fiber Directions

Effects of Steam Environment on Fatigue Behavior of Two SiC/[SiC+Si3N4] Ceramic Composites at 1300°C

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