Interlaminar Crack Growth Resistances of Various Ceramic Matrix Composites in Mode I and Mode II Loading

2008 ◽  
Vol 130 (3) ◽  
Author(s):  
Sung R. Choi ◽  
Robert W. Kowalik
Keyword(s):  
Crack Growth ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Mode I ◽  
Mode Ii ◽  
Crack Plane ◽  
Matrix Composites ◽  
Fiber Reinforced ◽  
Interlaminar Crack ◽  
Sic Composites

Interlaminar crack growth resistances were evaluated for five different SiC fiber-reinforced ceramic matrix composites (CMCs) including three gas-turbine grade melt-infiltrated SiC∕SiC composites. Modes I and II crack growth resistances, GI and GII, were determined at ambient temperature using double cantilever beam and end notched flexure methods, respectively. The CMCs exhibited GI=200–500J∕m2 and GII=200–900J∕m2. All the composites (except for one SiC/CAS composite) showed a rising R-curve behavior either in mode I or in mode II, presumably attributed to fiber bridging (in modes I and II) and frictional constraint (mode II) in the wake region of a propagating crack. A glass fiber-reinforced epoxy polymer matrix composite showed typically two to three times greater GI and eight times greater GII, compared to the CMCs. An experimental error analysis regarding the effect of the off-the-center of a crack plane on GI and GII was also made.

Interlaminar Crack Growth Resistances of Various Ceramic Matrix Composites in Mode I and Mode II Loading

2007 ◽  
Author(s):  
Sung R. Choi ◽  
Robert W. Kowalik
Keyword(s):  
Crack Growth ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Mode I ◽  
Mode Ii ◽  
Crack Plane ◽  
Matrix Composites ◽  
Fiber Reinforced ◽  
Interlaminar Crack ◽  
Sic Composites

Interlaminar crack growth resistances were evaluated for five different SiC fiber-reinforced ceramic matrix composites (CMCs) including three gas-turbine grade MI SiC/SiC composites. Modes I and II crack growth resistances, GI and GII, were determined at ambient temperature using double cantilever beam (DCB) and end notched flexure (ENF) methods, respectively. The CMCs exhibited GI = 200–500 J/m2 and GII = 200–900 J/m2. All the composites (except for one SiC/CAS composite) showed rising R-curve behavior either in mode I or in mode II, presumably attributed to fiber bridging (in modes I and II) and frictional constraint (mode II) in the wake region of a propagating crack. A glass fiber-reinforced epoxy polymer matrix composite, used as comparison, showed typically 2-3 and 8 times greater in GI and GII, respectively, compared to the CMCs. Experimental error analysis regarding the effect of the off-the-center of a crack plane on GI and GII was also made.

Dynamic Mechanical Properties of 2D-C/SiC and 2D-SiC/SiC

2019 ◽  
Vol 956 ◽  
pp. 244-252
Author(s):  
Xiao Ju Gao ◽  
Chao Li ◽  
Hasigaowa ◽  
Zhi Peng Li ◽  
Yu Guang Bao ◽  
...  
Keyword(s):  
Strain Rate ◽  
Room Temperature ◽  
Ceramic Matrix Composites ◽  
Rate Sensitivity ◽  
Ceramic Matrix ◽  
Dynamic Mechanical Properties ◽  
Matrix Composites ◽  
Fiber Reinforced ◽  
Mechanical Behaviors ◽  
Sic Composites

The quasi-static and dynamic compressive mechanical behaviors of two kinds of fiber reinforced SiC-matrix composites including 2D-C/SiC and 2D-SiC/SiC were investigated. Their compressive behaviors of materials at room temperature and strain rate from 10-4 to 104 /s were studied. The fracture surfaces and damage morphology were observed by scanning electron microscopy (SEM). The results showed that the dynamic failure strengths of the two kinds of fiber reinforced SiC-matrix composites obey the Weibull distribution. The Weibull modulus of the two materials were 13.70 (2D-C/SiC) and 5.66 (2D-SiC/SiC), respectively. It was found that the two kinds of fiber reinforced ceramic matrix composites presented a transition from brittle to tough with the decrease of strain rate. The 2D-SiC/SiC materials demonstrated a more HYPERLINK "http://dict.cnki.net/dict_result.aspx?searchword=%e6%98%be%e8%91%97%e7%9a%84&tjType=sentence&style=&t=remarkable"significant strain rate sensitivity and smoother fracture surface compared to the 2D-C/SiC composites, implying that the former composites present brittle features. This was because the SiC/SiC composites possessed high bonding strength in interface of fiber/fiber and fiber/matrix is very strong.

Development of ASTM Test Standards for the Mode I Interlaminar Fracture Toughness (GIc--Crack Growth Resistance) of Ceramic Matrix Composites

2018 ◽  
Author(s):  
Frank Abdi ◽  
Jalees Ahmad ◽  
Saber DorMohammadi ◽  
Cody Godines ◽  
Stephen Gonczy ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
High Temperature ◽  
Crack Growth ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Crack Growth Resistance ◽  
Test Method ◽  
Mode I ◽  
Matrix Composites ◽  
Interlaminar Fracture

Ceramic matrix composite (CMC) materials are targeted for high temperature application in aircraft and power turbines, because of their low density and high-temperature thermo-mechanical properties, compared to conventional nickel super alloys. New test methods are needed for the assessment of the effects of delamination cracks on the structural integrity and life of CMC components. The ASTM C28 Fracture Toughness (Crack Growth Resistance – CGR) Working Group has drafted a standard test method for the “Mode I Interlaminar Fracture Tougness (GIc – Crack Growth Resistance) of Fiber-Reinforced Ceramic Matrix Composites (CMC) by Wedge Loading of a Double Cantilever Beam at Ambient Temperatures” The wedge loading method was developed to avoid the problems of high temperature bonding of loading blocks and hinges. The ASTM test standard details the scope, use, and application of the test method, interferences, test equipment, specimen geometry and preparation, test procedures, data interpretation and calculation, and reporting requirements for the new CMC CGR test method.

scholarly journals Joining of Cf/SiC Ceramic Matrix Composites: A Review

2018 ◽  
Vol 2018 ◽  
pp. 1-15
Author(s):  
Keqiang Zhang ◽  
Lu Zhang ◽  
Rujie He ◽  
Kaiyu Wang ◽  
Kai Wei ◽  
...  
Keyword(s):  
Systematic Review ◽  
Silicon Carbide ◽  
Carbon Fiber ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Matrix Composites ◽  
Fiber Reinforced ◽  
Engineering Applications ◽  
Sic Ceramic ◽  
Sic Composites

Carbon fiber-reinforced silicon carbide (Cf/SiC) ceramic matrix composites have promising engineering applications in many fields, and they are usually geometrically complex in shape and always need to join with other materials to form a certain engineering part. Up to date, various joining technologies of Cf/SiC composites are reported, including the joining of Cf/SiC-Cf/SiC and Cf/SiC-metal. In this paper, a systematic review of the joining of Cf/SiC composites is conducted, and the aim of this paper is to provide some reference for researchers working on this field.

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