Effect of pyrocarbon interphase texture and thickness on tensile damage and fracture in T‐700 TM C/SiC minicomposites

2021 ◽  
Author(s):  
Haozhi Duan ◽  
Zhongwei Zhang ◽  
Longbiao Li ◽  
Weijie Li
Keyword(s):  
Damage And Fracture ◽  
Tensile Damage

scholarly journals Effect of Stochastic Loading on Tensile Damage and Fracture of Fiber-Reinforced Ceramic-Matrix Composites

Materials ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2469 ◽  
Author(s):  
Longbiao Li
Keyword(s):  
Fiber Strength ◽  
Ceramic Matrix Composites ◽  
Tangent Modulus ◽  
Interface Debonding ◽  
Matrix Composites ◽  
Fiber Volume ◽  
Damage And Fracture ◽  
Stochastic Loading ◽  
Composite Strain ◽  
Tensile Damage

In this paper, the effect of stochastic loading on tensile damage and fracture of fiber-reinforced ceramic-matrix composites (CMCs) is investigated. A micromechanical constitutive model is developed considering multiple damage mechanisms under tensile loading. The relationship between stochastic stress, tangent modulus, interface debonding and fiber broken is established. The effects of the fiber volume, interface shear stress, interface debonding energy, saturation matrix crack spacing and fiber strength on tensile stress–strain curve, tangent modulus, interface debonding fraction and fiber broken fraction are analyzed. The experimental tensile damage and fracture of unidirectional and 2D SiC/SiC composites subjected to different stochastic loading stress are predicted. When fiber volume increases, the initial composite strain decreases, the initial tangent modulus increases, the transition stress for interface debonding decreases and the initial fiber broken fraction decreases. When fiber strength increases, the initial composite strain and fiber broken fraction decrease.

scholarly journals Damage Evolution and Fracture Behavior of C/SiC Minicomposites with Different Interphases under Uniaxial Tensile Load

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1525
Author(s):  
Zhongwei Zhang ◽  
Longbiao Li ◽  
Zhaoke Chen
Keyword(s):  
Damage Evolution ◽  
Fracture Behavior ◽  
Crack Opening ◽  
Tensile Load ◽  
Image Correlation ◽  
Matrix Cracking ◽  
Elastic Response ◽  
Uniaxial Tensile ◽  
Damage And Fracture ◽  
Tensile Damage

In this paper, the tensile damage and fracture behavior of carbon fiber reinforced silicon carbide (C/SiC) minicomposites with single- and multiple-layer interphases are investigated. The effect of the interphase on the tensile damage and fracture behavior of C/SiC minicomposites is analyzed. The evolution of matrix cracking under the tensile load of the C/SiC minicomposite with a notch is observed using the digital image correlation (DIC) method. The damage evolution process of the C/SiC minicomposite can be divided into four main stages, namely, (1) an elastic response coupled with partial re-opening of thermal microcracking; (2) multiple matrix microcracking perpendicular to the applied loading; (3) crack opening and related fiber/matrix, bundle/matrix, and inter-bundle debonding; and (4) progressive transfer of the load to the fibers and gradual fiber failure until composite failure/fracture. On the fracture surface, a large number of fibers pulling out of the samples with both single-layer and multi-layer interphases can be clearly observed.

scholarly journals Modeling Tensile Damage and Fracture Behavior of Fiber-Reinforced Ceramic-Matrix Minicomposites

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4313
Author(s):  
Zhongwei Zhang ◽  
Yufeng Liu ◽  
Longbiao Li ◽  
Daining Fang
Keyword(s):  
Fracture Behavior ◽  
Tensile Load ◽  
Nonlinear Behavior ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Fiber Reinforced ◽  
Internal Damage ◽  
Damage Mechanisms ◽  
Damage And Fracture ◽  
Tensile Damage

Evolution of damage and fracture behavior of fiber-reinforced mini ceramic-matrix composites (mini-CMCs) under tensile load are related to internal multiple damage mechanisms, i.e., fragmentation of the brittle matrix, crack defection, and fibers fracture and pullout. In this paper, considering multiple micro internal damage mechanisms and related models, a micromechanical constitutive stress–strain relationship model is developed to predict the nonlinear mechanical behavior of mini-CMCs under tensile load corresponding to different damage domains. Relationships between multiple micro internal damage mechanisms mentioned above and tensile micromechanical multiple damage parameters are established. Experimental tensile nonlinear behavior, internal damage evolution, and micromechanical tensile damage parameters corresponding to different damage domains of two different types of mini-CMCs are predicted. The effects of constitutive properties and damage-related parameters on nonlinear behavior of mini-CMCs are discussed.

Comparison of prior exposure tensile damage and fracture of two-dimensional C/SiC and SiC/SiC fiber-reinforced ceramic-matrix composites

2020 ◽  
Vol 90 (23-24) ◽  
pp. 2782-2794
Author(s):  
Longbiao Li
Keyword(s):  
Tensile Strength ◽  
Fracture Strain ◽  
Prior Exposure ◽  
Interface Debonding ◽  
Fiber Volume ◽  
Damage And Fracture ◽  
Exposure Temperature ◽  
Fiber Characteristic ◽  
Sic Composites ◽  
Tensile Damage

In this paper, a micromechanical constitutive model for prior exposure tensile damage and fracture of fiber-reinforced ceramic-matrix composites is developed considering the multiple damage mechanisms of matrix multicracking, interface debonding and oxidation, and fiber fracture. The relationships between prior exposure temperature, duration time, interface debonding fraction, broken fiber fraction, tensile strength, and fracture strain of C/SiC and SiC/SiC composites are established. The experimental prior exposure tensile damage evolution and final fracture of two-dimensional (2D) C/SiC and SiC/SiC composites are predicted for different temperatures and duration times. The comparison analysis of prior exposure composite tensile strength, fracture strain, interface debonding fraction, and broken fiber fraction between 2D C/SiC and SiC/SiC composites is investigated. The effects of constituent properties and temperature on prior exposure tensile damage and fracture of 2D C/SiC and SiC/SiC composites are discussed. For 2D C/SiC and SiC/SiC composites under prior exposure at 1300℃, the fracture strain decreased with fiber volume, interface shear stress, and prior exposure temperature, and increased with fiber characteristic strength; the tensile strength increased with fiber volume and fiber characteristic strength, and decreased with prior exposure temperature; the interface debonding fraction decreased with fiber volume, and increased with prior exposure temperature; and the fiber broken fraction decreased with fiber volume and fiber characteristic strength, and increased with prior exposure temperature.

Acoustic emission by steel fiber reinforced concrete under tensile damage

2017 ◽  
Vol 59 (7-8) ◽  
pp. 653-660 ◽  
Author(s):  
Wang Yan ◽  
Ge Lu ◽  
Chen Shi Jie ◽  
Zhou Li ◽  
Zhang Ting Ting
Keyword(s):  
Acoustic Emission ◽  
Reinforced Concrete ◽  
Steel Fiber ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete ◽  
Tensile Damage
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