Finite Element Analysis of Damage in Fibrous Composites Using a Micromechanical Model PDF Download
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Author: Joseph Michael Berner
Publisher:
ISBN:
Category :
Languages : en
Pages : 78
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Book Description
The objective of this investigation is to study the damage mechanics of composite structures using a micromechanical approach for determining strength and stiffness degradation of the composite structures as damages, such as matrix cracking and fiber breakage, progress. The micromechanical cell method provides for analysis of stress at the fiber and matrix level while providing smeared composite properties for global structural analysis. As a result, the damage and failure criteria are expressed in terms of the fiber and matrix stress level of the composite structure. A correlation for stiffness reduction due to transverse cracking of a ceramic matrix composite under tensile loading is implemented in a three-dimensional finite element model. Next, thermal residual stresses from fabrication of the ceramic matrix composite are incorporated into the analysis. Finally, the finite element method is applied to a polymer matrix composite laminate with a center hole in order to study the progression of damage and final failure during tensile loading. The comparisons between the present predictions and the experimental results for the previous examples are very good.
Author: Joseph Michael Berner
Publisher:
ISBN:
Category :
Languages : en
Pages : 78
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Book Description
The objective of this investigation is to study the damage mechanics of composite structures using a micromechanical approach for determining strength and stiffness degradation of the composite structures as damages, such as matrix cracking and fiber breakage, progress. The micromechanical cell method provides for analysis of stress at the fiber and matrix level while providing smeared composite properties for global structural analysis. As a result, the damage and failure criteria are expressed in terms of the fiber and matrix stress level of the composite structure. A correlation for stiffness reduction due to transverse cracking of a ceramic matrix composite under tensile loading is implemented in a three-dimensional finite element model. Next, thermal residual stresses from fabrication of the ceramic matrix composite are incorporated into the analysis. Finally, the finite element method is applied to a polymer matrix composite laminate with a center hole in order to study the progression of damage and final failure during tensile loading. The comparisons between the present predictions and the experimental results for the previous examples are very good.
Author: Joseph Michael Berner
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
The objective of this investigation is to study the damage mechanics of composite structures using a micromechanical approach for determining strength and stiffness degradation of the composite structures as damages, such as matrix cracking and fiber breakage, progress. The micromechanical cell method provides for analysis of stress at the fiber and matrix level while providing smeared composite properties for global structural analysis. As a result, the damage and failure criteria are expressed in terms of the fiber and matrix stress level of the composite structure. A correlation for stiffness reduction due to transverse cracking of a ceramic matrix composite under tensile loading is implemented in a three-dimensional finite element model. Next, thermal residual stresses from fabrication of the ceramic matrix composite are incorporated into the analysis. Finally, the finite element method is applied to a polymer matrix composite laminate with a center hole in order to study the progression of damage and final failure during tensile loading. The comparisons between the present predictions and the experimental results for the previous examples are very good.
Author: Pengfei Liu
Publisher: Elsevier
ISBN: 0128209631
Category : Technology & Engineering
Languages : en
Pages : 396
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Book Description
Damage Modeling of Composite Structures: Strength, Fracture, and Finite Element Analysis provides readers with a fundamental overview of the mechanics of composite materials, along with an outline of an array of modeling and numerical techniques used to analyze damage, failure mechanisms and safety tolerance. Strength prediction and finite element analysis of laminated composite structures are both covered, as are modeling techniques for delaminated composites under compression and shear. Viscoelastic cohesive/friction coupled model and finite element analysis for delamination analysis of composites under shear and for laminates under low-velocity impact are all covered at length. A concluding chapter discusses multiscale damage models and finite element analysis of composite structures. Integrates intralaminar damage and interlaminar delamination under different load patterns, covering intralaminar damage constitutive models, failure criteria, damage evolution laws, and virtual crack closure techniques Discusses numerical techniques for progressive failure analysis and modeling, as well as numerical convergence and mesh sensitivity, thus allowing for more accurate modeling Features models and methods that can be seamlessly extended to analyze failure mechanisms and safety tolerance of composites under more complex loads, and in more extreme environments Demonstrates applications of damage models and numerical methods
Author: Pengfei Liu
Publisher: Elsevier
ISBN: 0323853536
Category : Technology & Engineering
Languages : en
Pages : 398
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Book Description
Damage Modeling of Composite Structures: Strength, Fracture, and Finite Element Analysis provides readers with a fundamental overview of the mechanics of composite materials, along with an outline of an array of modeling and numerical techniques used to analyze damage, failure mechanisms and safety tolerance. Strength prediction and finite element analysis of laminated composite structures are both covered, as are modeling techniques for delaminated composites under compression and shear. Viscoelastic cohesive/friction coupled model and finite element analysis for delamination analysis of composites under shear and for laminates under low-velocity impact are all covered at length. A concluding chapter discusses multiscale damage models and finite element analysis of composite structures. - Integrates intralaminar damage and interlaminar delamination under different load patterns, covering intralaminar damage constitutive models, failure criteria, damage evolution laws, and virtual crack closure techniques - Discusses numerical techniques for progressive failure analysis and modeling, as well as numerical convergence and mesh sensitivity, thus allowing for more accurate modeling - Features models and methods that can be seamlessly extended to analyze failure mechanisms and safety tolerance of composites under more complex loads, and in more extreme environments - Demonstrates applications of damage models and numerical methods
Author: Bhavani V. Sankar
Publisher: DEStech Publications, Inc
ISBN: 1605950890
Category : Technology & Engineering
Languages : en
Pages : 305
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Book Description
The fifth volume of the ASC series on advanced composites contains critical information on static and dynamic composite failure and how it is predicted and modeled using novel computational methods and micromechanical analysis.
Author: Chun-Chung Cheng
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
The objective of this thesis was to study whether simplified three dimensional finite element models could be used as a micromechanical model for analysis of stresses at the fiber and matrix level while providing smeared composite properties for the global structural analysis. The mathematical model was programmed using the MATLAB engineering software. For considering interface cracks between the fiber and matrix, springs were modeled in the connecting nodes between the fiber and matrix on each of the three degrees of freedom. When results were compared with experimental data, findings proved that the simplified three dimensional finite element models could simulate the material property of the graphite/epoxy composite very efficiently.
Author: Chun-Chung Cheng
Publisher:
ISBN:
Category :
Languages : en
Pages : 51
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Book Description
The objective of this thesis was to study whether simplified three dimensional finite element models could be used as a micromechanical model for analysis of stresses at the fiber and matrix level while providing smeared composite properties for the global structural analysis. The mathematical model was programmed using the MATLAB engineering software. For considering interface cracks between the fiber and matrix, springs were modeled in the connecting nodes between the fiber and matrix on each of the three degrees of freedom. When results were compared with experimental data, findings proved that the simplified three dimensional finite element models could simulate the material property of the graphite/epoxy composite very efficiently.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 702
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Book Description
Author: Jia-Yuarn Guo
Publisher:
ISBN:
Category :
Languages : en
Pages : 99
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Book Description
The objective of this study is to develop simplified micromechanical models to analyze the interface debonding between fiber and the matrix materials. Both analytical and simplified finite element models are used to predict the effective transverse elastic modules of fibrous composites with a partial interface crack based on the material properties of their constituents. The simplified finite element model uses springs in the connecting nodes between the fiber and matrix. A detailed finite element analysis, which is programmed using the MATLAB engineering software is performed to check the accuracy of the simplified models. The simplified models yield accurate effective transverse elastic modulii of various composites with partial interface cracks when compared to the results obtained from detailed finite element analyses.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 160
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Book Description
A micromechanical consistent and systematic theory is developed for the analysis of damage mechanisms in metal matrix composites. A coupled incremental damage and plasticity theory of metal matrix composites is introduced here. This allows damage to be path dependent either on the stress history or the thermodynamic force conjugate to damage. This is achieved through the use of incremental damage tensors. The model involves both overall and local approaches to characterize damage in these material due to cyclic and monotonic loads. Expressions are derived here for the elasto-plastic stress and strain concentration tensors for fibrous metal matrix composite materials in the damaged configurations. A finite element analysis is used for quantifying each type of damage and predicting the failure loads of dog-bone shaped specimen and center-cracked laminate metal matrix composite plates. The development of damage zones and the stress-strain response are shown for two types of laminated layups.
