Damage Detection and Tensile Performance of Various SiC/SiC Composites Impacted With High Speed Projectile

2013 ◽  
Author(s):  
Gregory N. Morscher ◽  
Christopher Baker ◽  
Andrew Gyekenyesi ◽  
Calvin Faucett ◽  
Sung Choi
Keyword(s):  
High Speed ◽  
Ceramic Matrix Composites ◽  
Impact Behavior ◽  
Matrix Composites ◽  
Tensile Performance ◽  
Post Test ◽  
Ultimate Failure ◽  
Post Impact ◽  
Sic Composites ◽  
Non Destructive

Implementation of ceramic matrix composites (CMCs) in jet engine applications necessitates the understanding of high velocity impact behavior. To this end, various melt-infiltrated SiC/SiC composites were impacted at room temperature at ∼350 m/s with different support systems and tensile tested to failure. Non-Destructive techniques including electrical resistance (ER) and flash thermography were used to examine the specimen pre and post impact. Some specimens were then post-tested in order to assess retained properties. For post tested specimens acoustic emission was used to monitor damage accumulation during the post test and leading up to ultimate failure. Microscopy was performed to correlate damage with impact and post-impact applied stress. The properties of the impacted specimens were assessed based on relevant damage zones. The results are also compared with similar studies performed on similar composites with stress-concentrators such as holes or notches and post-impact specimens tested in bending.

Foreign Object Damage in 3-D Woven SiC/SiC Ceramic Matrix Composites of Varying Architectures at Ambient and High Temperatures

2017 ◽  
Author(s):  
Michael J. Presby ◽  
Gregory N. Morscher ◽  
Craig Iwano ◽  
Brian Sullivan
Keyword(s):  
High Temperatures ◽  
Ceramic Matrix Composites ◽  
Matrix Composites ◽  
Foreign Object ◽  
Micro Computed Tomography ◽  
Foreign Object Damage ◽  
Sic Ceramic ◽  
Post Impact ◽  
Sic Composites ◽  
Non Destructive

Foreign object damage (FOD) behavior in 3-D woven SiC/SiC composites of three different fiber architectures were characterized at ambient (21 °C) and high temperatures (1100 °C) using tungsten carbide projectiles impacted at approximately 350 m/s. Non-destructive evaluation (NDE) techniques such as electrical resistance (ER) and micro-computed tomography (micro-CT) were used to evaluate and compare the damage morphologies of the different architectures. Post-impact retained strength was also conducted using a four point flexural test while utilizing acoustic emission (AE) and ER to monitor the damage accumulation.

scholarly journals Thermal Cycling Behavior of Bi-layer Yb2Si2O7/SiC EBC Coated Cf/SiC Composites in Burner Rig Tests

2021 ◽  
Author(s):  
Sian Chen ◽  
Pengju Chen ◽  
Junjie Duan ◽  
Maolin Chen ◽  
Peng Xiao ◽  
...  
Keyword(s):  
Weight Loss ◽  
Oxidation Resistance ◽  
High Speed ◽  
Sol Gel ◽  
Chemical Vapor ◽  
Ceramic Matrix Composites ◽  
Matrix Composites ◽  
Thermal Cycles ◽  
Corrosion Pit ◽  
Sic Composites

Abstract To improve the oxidation resistance of carbon fiber reinforced SiC ceramic matrix composites (Cf/SiC) at high-temperature and high-speed gas scour environment in burner rig tests, a novel bi-layer Yb2Si2O7/SiC EBC was prepared on the surface of Cf/SiC composites by chemical vapor deposition (CVD) and sol-gel method united with air spraying. Results show that bi-layer Yb2Si2O7/SiC coating showed better oxidation resistance for Cf/SiC specimens before 20 thermal cycles (300 min), which can efficiently prevent the oxidation of Cf/SiC specimens in a gas scour environment at 1773 K for 300 min with a weight loss of 5.93 × 10-3 g·cm-2. After 20 thermal cycles (≥300 min), the weight loss of the coated specimen is rapidly increased due to the formation of penetrating cracks. After the corrosion of 36 thermal cycles (540 min), some obvious annular corrosion pit area were found on the surface of Yb2Si2O7 outer coating, the center of the corrosion pit was easier to be the origin area of the cracks due to the greater impact force of the gas.

Effect of temperature on matrix multicracking evolution of C/SiC fiber-reinforced ceramic-matrix composites

2020 ◽  
Vol 39 (1) ◽  
pp. 189-199
Author(s):  
Longbiao Li
Keyword(s):  
Strain Energy ◽  
Ceramic Matrix Composites ◽  
Critical Value ◽  
Matrix Cracking ◽  
Interface Debonding ◽  
Matrix Composites ◽  
Temperature Dependent ◽  
Damage State ◽  
The Matrix ◽  
Sic Composites

AbstractIn this paper, the temperature-dependent matrix multicracking evolution of carbon-fiber-reinforced silicon carbide ceramic-matrix composites (C/SiC CMCs) is investigated. The temperature-dependent composite microstress field is obtained by combining the shear-lag model and temperature-dependent material properties and damage models. The critical matrix strain energy criterion assumes that the strain energy in the matrix has a critical value. With increasing applied stress, when the matrix strain energy is higher than the critical value, more matrix cracks and interface debonding occur to dissipate the additional energy. Based on the composite damage state, the temperature-dependent matrix strain energy and its critical value are obtained. The relationships among applied stress, matrix cracking state, interface damage state, and environmental temperature are established. The effects of interfacial properties, material properties, and environmental temperature on temperature-dependent matrix multiple fracture evolution of C/SiC composites are analyzed. The experimental evolution of matrix multiple fracture and fraction of the interface debonding of C/SiC composites at elevated temperatures are predicted. When the interface shear stress increases, the debonding resistance at the interface increases, leading to the decrease of the debonding fraction at the interface, and the stress transfer capacity between the fiber and the matrix increases, leading to the higher first matrix cracking stress, saturation matrix cracking stress, and saturation matrix cracking density.

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.

A comparative study of the impact behavior of ceramic matrix composites

1990 ◽  
Vol 37 (1-3) ◽  
pp. 267-278 ◽  
Author(s):  
T. Macke ◽  
J.M. Quenisset ◽  
D. Neuilly ◽  
J.P. Rocher ◽  
R. Naslain
Keyword(s):  
Comparative Study ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Impact Behavior ◽  
Matrix Composites ◽  
The Impact

Impact Behavior of Fiber Reinforced Glass Matrix Composites

1988 ◽  
Vol 120 ◽  
Author(s):  
D. F. Hasson ◽  
S. G. Fishman
Keyword(s):  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Fracture Analysis ◽  
Orientation Dependence ◽  
Impact Behavior ◽  
Matrix Composites ◽  
Interfacial Bond ◽  
Sliding Mechanism ◽  
Glass Matrix Composites ◽  
Glass Matrices

AbstractCeramic matrix composites with continuous fibers in glass matrices were tested with instrumented impact apparatuses. The composite architectures were unidirectional (0°) and crossply (0/90°). For the 0/90° laminates, interlaminar and edge on orientation specimens were tested. An orientation dependence was observed. The CMC material with a weaker fiber/matrix interfacial bond had longer fiber pullout, and hence due to the frictional sliding mechanism higher dynamic work to fracture. In the fracture analysis discussion it is suggested that the use of the LEFM, K, parameter should be qualified in the fracture testing of CMC materials. These qualified toughness K values were found to be in the range of those reported for metal matrix composites.

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