Combined Effects of CMAS and FOD in Ceramic Matrix Composites

2012 ◽  
Author(s):  
Sung R. Choi ◽  
D. Calvin Faucett
Keyword(s):  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Chemical Compositions ◽  
Combined Effects ◽  
Matrix Composites ◽  
Foreign Object ◽  
Partial Support ◽  
Foreign Object Damage ◽  
Calcium Magnesium ◽  
The Impact

The combined effects of CMAS (calcium magnesium aluminosilicate) and FOD (foreign object damage) were determined in three different ceramic matrix composites (CMCs), two melt-infiltrated (MI) SiC/SiCs and one oxide/oxide. Foreign object damage was introduced at ambient temperature in CMC test targets using 1.6 mm steel ball projectiles at an impact velocity of 340 m/s utilizing a ballistic impact gun. One type of target support, partial support, was used. The impact-damaged test coupons were then CMAS-exposed at 1200°C for 10 hrs in air. Additional tests were also performed by exposing impact-damaged test coupons to a mixture of CMAS and salt (sodium sulfate) at 1200°C for 10 hrs in air. The combined effects of FOD and CMAS or CMAS/salt were quantified by determining the residual strengths of test coupons after exposures. Also, six different sands ingested into aeroengines were analyzed in their chemical compositions. The melt CMAS solid, melted at 1300°C and solidified, was assessed in its mechanical properties of microhardness and fracture toughness.

Development and Evaluation of Foreign Object Damage Resistant Ceramic Matrix Composites

2017 ◽  
Author(s):  
Craig Iwano ◽  
Brian Sullivan ◽  
Michelle Hoo Fatt
Keyword(s):  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Experimental Program ◽  
Matrix Composites ◽  
Foreign Object ◽  
Foreign Object Damage ◽  
Sic Fiber ◽  
Materials Research ◽  
Computational Materials ◽  
The Impact

Under a Phase II Navy SBIR program, Materials Research & Design (MR&D) performed an integrated analytical, fabrication and experimental program in order to develop foreign object damage (FOD) resistant silicon carbide (SiC) fiber-based ceramic matrix composites (CMCs), specifically 2D tape SiC/SiC. MR&D believes strongly that the most efficient approach towards the development of FOD-resistant CMCs is to develop a mathematical simulation of the impact event which can be correlated to measured responses and observed failures. Once correlated with available test data, the developed math model was used as part of an Integrated Computational Materials Engineering (ICME) approach to analytically investigate modifications to baseline CMC material in an attempt to identify which properties best influenced FOD resistance. The best candidate material modifications were then selected for fabrication and experimental validation. When considering all of the numerical and empirical data (visible damage, rebound velocity (energy absorption), strain data, NDE inspection and residual strength testing), all of the MR&D-proposed material modifications demonstrated improved FOD resistance when compared to the baseline CMC material.

Characterization and simulation of foreign object damage in curved and flat SiC/SiC ceramic matrix composites

2019 ◽  
Vol 45 (2) ◽  
pp. 2635-2643 ◽  
Author(s):  
Michael J. Presby ◽  
Rabih Mansour ◽  
K. Manigandan ◽  
Gregory N. Morscher ◽  
Frank Abdi ◽  
...  
Keyword(s):  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Matrix Composites ◽  
Foreign Object ◽  
Foreign Object Damage ◽  
Sic Ceramic

Quantification of Foreign Object Damage and Electrical Resistivity for Ceramic Matrix Composites and Tensile Residual Strength Prediction

2015 ◽  
Vol 137 (5) ◽  
Author(s):  
Frank Abdi ◽  
Gregory N. Morscher ◽  
Yibin Xue ◽  
Sung Choi
Keyword(s):  
Electrical Resistivity ◽  
Residual Strength ◽  
Fiber Strength ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Matrix Composites ◽  
Foreign Object ◽  
Foreign Object Damage ◽  
Transverse Tensile ◽  
Damage States

SiC-based ceramic matrix composites (CMC) in turbine engine applications must sustain certain foreign object impacts (FOIs) that might occur in services. Experiments and nondestructive evaluation (NDE) have illustrated good correlations between impact energy and foreign object damage (FOD) assessed using electrical resistivity (ER), acoustic emission (AE), and microscopy. A progressive failure dynamic analysis (PFDA) method is explored in understanding and predicting the damage states, ER, and residual strength after impact of CMCs. To accurately correlate the damage state with ER, the PFDA tool has been improved to incorporate the physical damage mechanisms in CMCs, which are matrix microcrack density due to both longitudinal and transverse tensile loads and the fiber breakage due to probabilistic fiber strength distribution. The predicted damage states and ER are correlated with the measurement of FOD and validated with tension after impact tests using high temperature ER. The PFDA tool has demonstrated a great potential for CMCs' FOD and residual strength predictions.

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

Foreign Object Impact Damage in Ceramic Matrix Composites: Experiments and Computational Predictions

2019 ◽  
Author(s):  
Rajesh S. Kumar ◽  
Matthew M. Mordasky
Keyword(s):  
Computational Modeling ◽  
Damage Mechanics ◽  
Ceramic Matrix Composite ◽  
Engine Performance ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Foreign Object ◽  
Damage State ◽  
Internal Damage ◽  
The Impact

Abstract Foreign object impact of Ceramic Matrix Composite (CMC) materials and components in a gas turbine engine environment could be detrimental to engine performance and hence must be accounted for in the design of such components. This paper is concerned with experiments and computational modeling of foreign object impact phenomenon in Silicon Carbide-based CMC. Controlled impact experiments were conducted on the CMC material using a gas-gun apparatus with spherical hardened steel projectile. The internal damage state within the CMC specimens was assessed using X-ray computed tomography scan technique. The computational modeling involved explicit dynamic finite element simulation of the impact process wherein either delamination mechanism is modeled or both ply damage and delamination mechanisms are modeled in a coupled manner. The delamination mechanism is modeled explicitly using cohesive-zone fracture mechanics approach, whereas, the ply damage mechanisms are modeled implicitly using simplified continuum damage mechanics approach. The simulation results were found to be in reasonable qualitative and quantitative agreement with the experimental results. Furthermore, it is shown that modeling both the ply damage and delamination mechanisms are essential to predict the correct delamination pattern even for intermediate velocity impacts that leads to predominantly delamination damage. The predictive nature of the modeling approach is demonstrated and approaches to enhance the models are also discussed.

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