Preliminary numerical investigation of TRISO-matrix interface debonding characteristics in fully ceramic microencapsulated fuel

2021 ◽  
Vol 159 ◽  
pp. 108338
Author(s):  
Cheng Zhang ◽  
Yangyang Wang ◽  
Yingwei Wu ◽  
Shichao Liu ◽  
Ping Chen ◽  
...  
Keyword(s):  
Numerical Investigation ◽  
Interface Debonding ◽  
Matrix Interface

Effect of Reinforcement Addition on Microstructure and Mechanical Properties of Al Matrix Composites

2014 ◽  
Vol 989-994 ◽  
pp. 515-518
Author(s):  
Guo Jun Ma ◽  
Yu Tian Ding ◽  
Pei Peng Jin
Keyword(s):  
Mechanical Properties ◽  
Ductile Failure ◽  
Interface Debonding ◽  
Matrix Composites ◽  
Matrix Interface ◽  
Composite Image ◽  
Properties Of Materials ◽  
Al Matrix Composites ◽  
Al Matrix ◽  
Fracture Nucleation

The study investigates the influence of different fraction of Mg2B2O5 whiskers (5, 10, 15 and 20vol.% ) on the microstructure of the hot extruded composite as well as on the mechanical properties in the same condition. The results indicate that the process is available for producing the composite, image analysis shows the whisker tends to cluster together with increasing content of reinforcement. When the content of the reinforcement is 10%, the composites exhibit the best mechanical properties, meanwhile, it demonstrate cluster is unfavorable to the improvement of properties of materials. The ductile failure of 6061Al matrix, the reinforcement fracture and the whisker-matrix interface debonding acted as the main mechanism of fracture nucleation.

A time-dependent tensile constitutive model for long-fiber-reinforced unidirectional ceramic-matrix minicomposites considering interface and fiber oxidation

2020 ◽  
Vol 29 (7) ◽  
pp. 1138-1166 ◽  
Author(s):  
Li Longbiao
Keyword(s):  
Shear Stress ◽  
Tensile Stress ◽  
Weibull Modulus ◽  
Oxidation Time ◽  
Matrix Cracking ◽  
Time Dependent ◽  
Interface Debonding ◽  
Matrix Interface ◽  
Fiber Failure ◽  
Fiber Matrix Interface

In this paper, a time-dependent tensile constitutive model of long-fiber-reinforced unidirectional ceramic-matrix minicomposites is developed considering the interface and fiber oxidation. The relationship between the time-dependent tensile behavior and internal damage is established. The damage mechanisms of time-dependent matrix cracking, fiber/matrix interface debonding, fiber failure, and the oxidation of the interface and fiber are considered in the analysis of the time-dependent tensile stress–strain curve. The fracture mechanic approach, matrix statistical cracking model, and fiber statistical failure model are used to determine the time-dependent interface debonding length, matrix crack spacing, and the fiber failure probability considering the time-dependent interface and fiber oxidation. The effects of the fiber volume, fiber radius, matrix Weibull modulus, matrix cracking characteristic strength, matrix cracking saturation spacing, interface shear stress, interface debonding energy, fiber strength, fiber Weibull modulus, and oxidation time on the time-dependent tensile stress–strain curves, matrix cracking density, interface debonding, and fiber failure are discussed. The experimental time-dependent tensile stress–strain curves, matrix cracking, interface debonding, and fiber failure of four different unidirectional SiC/SiC minicomposites for different oxidation time are predicted. The composite tensile strength and failure strain increase with the fiber volume, fiber strength, and fiber Weibull modulus, and decrease with the oxidation time; the fiber/matrix interface debonding length increases with the fiber radius and oxidation time and decreases with the interfacial shear stress and interface debonding energy; the fiber/matrix interface oxidation ratio increases with the interfacial shear stress, interface debonding energy, and oxidation time and decreases with the saturation matrix crack spacing.

A computational approach with surface-based cohesive contact for meso-scale interface damage simulation in 3D braided composites

2020 ◽  
pp. 152808372098017
Author(s):  
Chao Zhang ◽  
Jianchun Liu ◽  
Tinh Quoc Bui ◽  
Jose L Curiel-Sosa ◽  
Jinzhong Lu
Keyword(s):  
Damage Evolution ◽  
Textile Composites ◽  
Interface Debonding ◽  
Progressive Damage ◽  
Fe Model ◽  
Matrix Interface ◽  
Braided Composites ◽  
3D Braided Composites ◽  
Damage Simulation ◽  
Meso Scale

The yarn/yarn and yarn/matrix interface debonding has been recognized as a vital failure mode of 3 D braided composites. We present in this paper a meso-scale finite element (FE) model, which considers yarn/yarn and yarn/matrix interface debonding, for modeling progressive damage evolution of 3 D braided composites under typical tensile and shear loadings. In this setting, the damage state of braiding yarns and matrix is described through a continuum damage model (CDM) coupled with Murakami damage tensor; a bilinear traction-separation description is employed to govern the yarn/yarn and yarn/matrix interface behavior modeled by surface-based cohesive contact. We thus develop a user-material subroutine VUMAT (ABAQUS/Explicit) for our progressive damage simulation, including stress analysis, failure analysis and material properties degradation scheme. The mechanical properties of 3 D braided composites, and more importantly the damage evolution of interface debonding are thoroughly analyzed. The proposed FE modeling strategy provides a new perspective for the interface response study of other textile composites.

Tensile Properties of 4D In-Plane C/C Composites

2012 ◽  
Vol 161 ◽  
pp. 30-36
Author(s):  
Bo Gao ◽  
Min Tang ◽  
Hong Bin Shi
Keyword(s):  
Tensile Strength ◽  
Shear Strength ◽  
Tensile Properties ◽  
Fiber Bundle ◽  
Interface Debonding ◽  
Zone Model ◽  
Strength Increase ◽  
Matrix Interface ◽  
Pull Out ◽  
Fracture Simulation

The tensile properties of 4D in-plane carbon/carbon (C/C) composites were researched by MTS machine and ARAMIS optical strain test system. A damage model for analysis the gradual damage was proposed, which chose hoffman criterion and twin shear strength theory as the failure criterion of fiber bundle and matrix, respectively. Cohesive zone model was used to simulate the interfacial debonding at the fiber bundle/matrix interface. The effect of shear strength of fiber bundle/matrix interface on the tensile strength was researched. It is shown that the major factor caused by the failure of the material at axial tensile is the interface debonding, which make the fiber bundle pull out from the matrix. The failure factor for the radical tensile is the crack through out the fiber bundle and matrix, and that make the material fracture. Simulation result shows the interface shear strength have a significant effect on the tensile strength. With the strength promote, the tensile strength increase, and the best value of interface strength is 11MPa.

scholarly journals Finite Element Modeling of the Fiber-Matrix Interface in Polymer Composites

2020 ◽  
Vol 4 (2) ◽  
pp. 58 ◽  
Author(s):  
Daljeet K. Singh ◽  
Amol Vaidya ◽  
Vinoy Thomas ◽  
Merlin Theodore ◽  
Surbhi Kore ◽  
...  
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Polymer Composites ◽  
Parametric Study ◽  
Single Fiber ◽  
Interface Debonding ◽  
Matrix Interface ◽  
The Matrix ◽  
Fiber Matrix Interface ◽  
Fiber Matrix

Polymer composites are used in numerous industries due to their high specific strength and high specific stiffness. Composites have markedly different properties than both the reinforcement and the matrix. Of the several factors that govern the final properties of the composite, the interface is an important factor that influences the stress transfer between the fiber and matrix. The present study is an effort to characterize and model the fiber-matrix interface in polymer matrix composites. Finite element models were developed to study the interfacial behavior during pull-out of a single fiber in continuous fiber-reinforced polymer composites. A three-dimensional (3D) unit-cell cohesive damage model (CDM) for the fiber/matrix interface debonding was employed to investigate the effect of interface/sizing coverage on the fiber. Furthermore, a two-dimensional (2D) axisymmetric model was used to (a) analyze the sensitivity of interface stiffness, interface strength, friction coefficient, and fiber length via a parametric study; and (b) study the shear stress distribution across the fiber-interface-matrix zone. It was determined that the force required to debond a single fiber from the matrix is three times higher if there is adequate distribution of the sizing on the fiber. The parametric study indicated that cohesive strength was the most influential factor in debonding. Moreover, the stress distribution model showed the debonding mechanism of the interface. It was observed that the interface debonded first from the matrix and remained in contact with the fiber even when the fiber was completely pulled out.

A thermomechanical fatigue hysteresis-based damage evolution model for fiber-reinforced ceramic–matrix composites

2018 ◽  
Vol 28 (3) ◽  
pp. 380-403 ◽  
Author(s):  
Li Longbiao
Keyword(s):  
Damage Evolution ◽  
Ceramic Matrix Composites ◽  
Peak Stress ◽  
Fatigue Loading ◽  
Thermomechanical Fatigue ◽  
Interface Debonding ◽  
Matrix Interface ◽  
Cycle Number ◽  
Fiber Matrix Interface ◽  
Fiber Matrix

In this paper, a thermomechanical fatigue hysteresis-based damage evolution model for fiber-reinforced ceramic–matrix composites has been developed. Upon unloading and reloading, the fiber/matrix interface debonded length, interface counter-slip length, and interface new-slip length change with increasing or decreasing applied stress, which affects the stress–strain fatigue hysteresis loops and fatigue hysteresis-based damage parameters. The reloading/unloading stress–strain relationships when fiber/matrix interface partially or completely debonding are determined as a function of interface debonding/sliding, peak stress, applied cycle number, and thermal cycle temperature. The relationships between thermomechanical fatigue loading parameters (i.e. peak stress, applied cycle number, and thermal cyclic temperature), fiber/matrix interface debonding/sliding lengths, and fatigue hysteresis-based damage parameters (i.e. fatigue hysteresis dissipated energy, fatigue hysteresis modulus, and fatigue peak strain) have been established. The effects of fiber volume fraction, peak stress, matrix cracking space, and thermal cyclic temperature range on damage evolution under the out-of-phase thermomechanical cyclic loading have been discussed. The differences in damage evolution between in-phase/out-of-phase thermomechanical fatigue and isothermal fatigue loading at the same peak stress have been analyzed. The damage evolution of cross-ply SiC/magnesium aluminosilicate composite under the out-of-phase thermomechanical and isothermal fatigue loading has been predicted.

Numerical Investigation on Void Nucleation around Inclusions under Combined Mechanical and Thermal Cycling Conditions

2013 ◽  
Vol 762 ◽  
pp. 343-348
Author(s):  
Cheng Jin ◽  
Chun Yuan Shi ◽  
Guan Lin Li ◽  
Ji Tai Niu
Keyword(s):  
Thermal Cycling ◽  
Numerical Investigation ◽  
Cell Model ◽  
Void Nucleation ◽  
Local Stress ◽  
Failure Criteria ◽  
Interface Debonding ◽  
Plastic Energy ◽  
New Energy ◽  
The Matrix

In this paper a numerical investigation on the void nucleation behaviors under combined mechanical and thermal cycling conditions have been performed. A finite element unit cell model is conduct to calculate the local stress-strain field and describe the process of void nucleation from inclusion. Numerical results show that the thermal mismatch stress between the particles and matrix can assist the external load to cause interface debonding. Under certain mechanical and thermal cycling conditions, complicated stress and strain hystereses developed in the matrix. Both the plastic strain and plastic energy density of the interface will be accumulated during every thermal cycle. The plastic energy accumulation of the interface will first reach the debonding value and failure occurs. Based on the numerical calculation, a new energy based failure criteria is proposed to characterize the behaviors of void nucleation under combine mechanical and thermal cycling conditions.

scholarly journals Effect of Interface Properties on Tensile and Fatigue Behavior of 2D Woven SiC/SiC Fiber-Reinforced Ceramic-Matrix Composites

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Longbiao Li
Keyword(s):  
Fatigue Behavior ◽  
Ceramic Matrix Composites ◽  
Matrix Cracking ◽  
Interface Debonding ◽  
Interface Properties ◽  
Matrix Interface ◽  
Fiber Matrix Interface ◽  
Fiber Matrix ◽  
Stress Matrix ◽  
Cracking Stress

In this paper, the effect of the fiber/matrix interface properties on the tensile and fatigue behavior of 2D woven SiC/SiC ceramic-matrix composites (CMCs) is investigated. The relationships between the interface parameters of the fiber/matrix interface debonding energy and interface frictional shear stress in the interface debonding region and the composite tensile and fatigue damage parameters of first matrix cracking stress, matrix cracking density, and fatigue hysteresis-based damage parameters are established. The effects of the fiber/matrix interface properties on the first matrix cracking stress, matrix cracking evolution, first and complete interface debonding stress, fatigue hysteresis dissipated energy, hysteresis modulus, and hysteresis width are analyzed. The experimental first matrix cracking stress, matrix cracking evolution, and fatigue hysteresis loops of SiC/SiC composites are predicted using different interface properties.

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