A method for identifying the interface shear stress of unidirectional ceramic matrix composites

2021 ◽  
Vol 47 (1) ◽  
pp. 64-72
Author(s):  
Xiao Han ◽  
Xiguang Gao ◽  
Yunfa Jia ◽  
Weikang Meng ◽  
Yingdong Song ◽  
...  
Keyword(s):  
Shear Stress ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Matrix Composites ◽  
Interface Shear ◽  
Interface Shear Stress

Damage evolution of carbon fiber-reinforced ceramic-matrix composites with different fiber preforms using the fatigue hysteresis loop area

2016 ◽  
Vol 88 (5) ◽  
pp. 532-551 ◽  
Author(s):  
Longbiao Li
Keyword(s):  
Shear Stress ◽  
Hysteresis Loop ◽  
Ceramic Matrix Composites ◽  
Inert Atmosphere ◽  
Matrix Composites ◽  
Interface Shear ◽  
Interface Shear Stress ◽  
Loop Area ◽  
Hysteresis Loop Area ◽  
Fiber Preforms

The damage evolution of C/SiC ceramic-matrix composites with different fiber preforms, that is, unidirectional, cross-ply and 2.5D woven, under cyclic fatigue loading at room and elevated temperatures in air and inert atmosphere has been investigated. The experimental fatigue hysteresis modulus and hysteresis loop area versus cycle numbers have been analyzed. The relationships between the fatigue hysteresis loop area, interface slip and interface shear stress have been established. The evolution of the fatigue hysteresis loop area and interface shear stress as a function of applied cycles has been analyzed for different peak stresses, fiber preforms and test conditions. For different fiber preforms and test conditions, the fatigue hysteresis loop area degrades the fastest for unidirectional C/SiC at 800℃ in air, and the slowest for 2.5D C/SiC at 600℃ in an inert atmosphere, due to the different degradation rates of interface shear stress.

Modeling matrix fracture in fiber-reinforced ceramic-matrix composites with different fiber preforms

2019 ◽  
Vol 90 (7-8) ◽  
pp. 909-924 ◽  
Author(s):  
Longbiao Li
Keyword(s):  
Elastic Modulus ◽  
Ceramic Matrix Composites ◽  
Interface Debonding ◽  
Matrix Composites ◽  
Multiple Fracture ◽  
Fiber Volume ◽  
Interface Shear ◽  
Interface Shear Stress ◽  
The Matrix ◽  
Fiber Preforms

In this paper, the stress-dependent matrix multiple fracture in silicon carbide fiber-reinforced ceramic-matrix composites with different fiber preforms is investigated. The critical matrix strain energy criterion is used to determine the matrix multiple fracture considering the interface debonding. The effects of the fiber radius, fiber elastic modulus, matrix elastic modulus, fiber volume, interface shear stress, and interface debonded energy on the matrix multiple fracture and the interface debonding are analyzed. The experimental matrix multiple cracking and interface debonding of minicomposite, unidirectional, and two-dimensional woven SiC/SiC composites with different fiber volumes and interphases are predicted. The matrix cracking density increases with the increasing of the fiber volume, fiber elastic modulus, interface shear stress, and interface debonded energy, and the decreasing of the fiber radius and matrix elastic modulus.

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