Acoustic emission study of failure mechanisms in ceramic matrix composite under longitudinal tensile loading

1997 ◽  
Vol 30 (2) ◽  
pp. 110
Keyword(s):  
Acoustic Emission ◽  
Matrix Composite ◽  
Failure Mechanisms ◽  
Ceramic Matrix Composite ◽  
Ceramic Matrix ◽  
Tensile Loading ◽  
Emission Study ◽  
Acoustic Emission Study

scholarly journals An Advanced Finite Element Modeling for the Failure of Notched Ceramic Matrix Composite With TFP Patch Reinforcement

2021 ◽  
Vol 8 ◽  
Author(s):  
Gang Zhao ◽  
Jianbo Tang ◽  
Jun Wang ◽  
Yunsheng Chen ◽  
Yajie Feng ◽  
...  
Keyword(s):  
Matrix Composite ◽  
Failure Mechanisms ◽  
Damage Model ◽  
Ceramic Matrix Composite ◽  
Mesh Size ◽  
Ceramic Matrix ◽  
Damage And Failure ◽  
Virtual Test ◽  
Modeling Strategy ◽  
Progressive Damage Model

An advanced modeling strategy for notched ceramic matrix composite coupons with patch reinforcement was proposed to investigate the failure mechanisms. This model considered the tailored fiber–placed (TFP) yarn details obtained from the design phase and the embedded element concept which was used to successfully overcome the meshing difficulties. Inter-ply “glue” layers were simulated using the surface-based contact cohesive element method, so the delamination due to interfacial material discontinuity and damage can be well reproduced and analyzed. For composite ply, the energy-based composite progressive damage model that is independent of the mesh size was applied. Virtual test campaign was performed with a variety of geometrical and material parameters, and the damage and failure mechanisms based on the stress analysis can be revealed to support the design optimization of patch reinforcement.

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.

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