Foreign Object Damage in an Oxide/Oxide CMC Subjected to Tensile Preloading

2015 ◽  
Author(s):  
D. Calvin Faucett ◽  
Nesredin Kedir ◽  
Sung R. Choi
Keyword(s):  
Impact Damage ◽  
Incidence Angle ◽  
Ceramic Matrix Composite ◽  
Normal Incidence ◽  
Load Factor ◽  
Oxide Ceramic ◽  
Foreign Object ◽  
Foreign Object Damage ◽  
Load Factors ◽  
Alumina Oxide

Foreign object damage (FOD) phenomenon of an N720/alumina oxide/oxide ceramic matrix composite (CMC) was determined previously using 1.59 mm-diameter hardened steel ball projectiles using impact velocities ranging from 150 to 350 m/s at a normal incidence angle. Target specimens were impacted under tensile preloading with three different levels of load factors of 0, 30, and 50%. Difference in impact damage between no-preload and pre-load was significant particularly at 350 m/s with the highest load factor of 50%. A fracture mechanics approach was used to predict post-impact strength as a function of load factor and was assessed its applicability using the experimental data.

Foreign Object Damage in an Oxide/Oxide Ceramic Matrix Composite (CMC) Under Prescribed Tensile Loading

2016 ◽  
Author(s):  
Nesredin Kedir ◽  
David Faucett ◽  
Luis Sanchez ◽  
Sung R. Choi
Keyword(s):  
Matrix Composite ◽  
Impact Damage ◽  
Ceramic Matrix Composite ◽  
Ceramic Matrix ◽  
Tensile Loading ◽  
Load Factor ◽  
Oxide Ceramic ◽  
Foreign Object ◽  
Foreign Object Damage ◽  
The Impact

Foreign object damage (FOD) behavior of an N720/alumina oxide/oxide ceramic matrix composite (CMC) was characterized at ambient temperature by using spherical projectiles impacted at velocities ranging from 100 to 350 m/s. The CMC targets were subject to ballistic impact at a normal incidence angle while being loaded under different levels of tensile loading in order to simulate conditions of rotating aeroengine airfoils. The impact damage of frontal and back surfaces was assessed with respect to impact velocity and load factor. Subsequent post-impact residual strength was also estimated to determine quantitatively the severity of impact damage. Impact force was predicted based on the principles of energy conservation.

Foreign Object Damage in an Oxide/Oxide Ceramic Matrix Composite Under Prescribed Tensile Loading

2016 ◽  
Vol 139 (2) ◽  
Author(s):  
Nesredin Kedir ◽  
David Faucett ◽  
Luis Sanchez ◽  
Sung R. Choi
Keyword(s):  
Matrix Composite ◽  
Impact Damage ◽  
Ceramic Matrix Composite ◽  
Ceramic Matrix ◽  
Tensile Loading ◽  
Load Factor ◽  
Oxide Ceramic ◽  
Foreign Object ◽  
Foreign Object Damage ◽  
The Impact

Foreign object damage (FOD) behavior of an N720/alumina oxide/oxide ceramic matrix composite (CMC) was characterized at ambient temperature by using spherical projectiles impacted at velocities ranging from 100 to 350 m/s. The CMC targets were subject to ballistic impact at a normal incidence angle while being loaded under different levels of tensile loading in order to simulate conditions of rotating aeroengine airfoils. The impact damage of frontal and back surfaces was assessed with respect to impact velocity and load factor. Subsequent postimpact residual strength was also estimated to determine quantitatively the severity of impact damage. Impact force was predicted based on the principles of energy conservation.

Foreign Object Damage Behavior of a SiC Fibrous Ceramic Composite

2017 ◽  
Author(s):  
Nesredin Kedir ◽  
D. Calvin Faucett ◽  
Luis Sanchez ◽  
Sung R. Choi
Keyword(s):  
Ceramic Composite ◽  
Impact Force ◽  
Impact Damage ◽  
Incidence Angle ◽  
Fibrous Composite ◽  
Normal Incidence ◽  
Foreign Object ◽  
Foreign Object Damage ◽  
Post Impact ◽  
The Impact

The response of a SiC fibrous ceramic composite to foreign object damage was determined at ambient temperature and velocities ranging from 40 to 150 m/s. Target specimens were impacted, at a normal incidence angle and in a partially supported configuration, using 1.59 mm-diameter hardened steel ball projectiles. Qualitative analysis of the damage morphologies of targets and projectiles were made via scanning electron microscopy (SEM). In addition, the extent of impact damage was characterized by determining the post-impact strength of each target specimen as a function of impact velocity. Relative to the as-received strength, the fibrous composite showed limited strength degradation due to impact with the maximum reduction of 17 % occurring at 150 m/s. A quasi-static analysis of the impact force prediction was also made based on the principle of energy conservation and the results were verified via experimental data.

Foreign Object Damage Behavior of a Silicon Carbide Fibrous Ceramic Composite

2018 ◽  
Vol 141 (4) ◽  
Author(s):  
Nesredin Kedir ◽  
D. Calvin Faucett ◽  
Luis Sanchez ◽  
Sung R. Choi
Keyword(s):  
Silicon Carbide ◽  
Ceramic Composite ◽  
Impact Damage ◽  
Incidence Angle ◽  
Fibrous Composite ◽  
Normal Incidence ◽  
Foreign Object ◽  
Foreign Object Damage ◽  
Post Impact ◽  
The Impact

The response of a silicon carbide (SiC) fibrous ceramic composite to foreign object damage (FOD) was determined at ambient temperature and velocities ranging from 40 to 150 m/s. Target specimens were impacted, at a normal incidence angle and in a partially supported configuration, using 1.59 mm diameter hardened steel ball projectiles. Qualitative analysis of the damage morphologies of targets and projectiles was made via scanning electron microscopy (SEM). In addition, the extent of impact damage was characterized by determining the post-impact strength of each target specimen as a function of impact velocity. Relative to the as-received (As-R) strength, the fibrous composite showed limited strength degradation due to impact with the maximum reduction of 17% occurring at 150 m/s. A quasi-static analysis of the impact force prediction was also made based on the principle of energy conservation and the results were verified via experimental data.

Foreign Object Damage in an Oxide/Oxide Composite at Ambient Temperature

2008 ◽  
Vol 131 (2) ◽  
Author(s):  
Sung R. Choi ◽  
Donald J. Alexander ◽  
Robert W. Kowalik
Keyword(s):  
Impact Strength ◽  
Ambient Temperature ◽  
Impact Damage ◽  
Ceramic Matrix Composite ◽  
High Energy ◽  
Strength Degradation ◽  
Foreign Object ◽  
Foreign Object Damage ◽  
Oxide Composite ◽  
Post Impact

Foreign object damage behavior of an oxide/oxide (N720/AS) ceramic matrix composite was determined at ambient temperature using impact velocities ranging from 100 m/s to 400 m/s by 1.59 mm diameter steel-ball projectiles. Two different support configurations of target specimens were used: fully supported and partially supported. The degree of post-impact strength degradation increased with increasing impact velocity and was greater in a partially supported configuration than in a fully supported one. For the fully supported configuration, frontal contact stress played a major role in generating composite damage, while for the partially supported case, both frontal contact and backside flexure stresses were the combined sources of damage generation. The oxide/oxide composite was able to survive high energy (∼1.3 J) impacts without complete structural failure. The degree of relative post-impact strength degradation of the oxide/oxide composite was similar to that of an advanced SiC/SiC composite observed from a previous study, regardless of the type of specimen support. Like the SiC/SiC composite, impact-damage tolerance was greater in the oxide/oxide than in monolithic silicon nitride ceramics for impact velocities >300 m/s.

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