A Multiscale Computational Model for Predicting Damage Evolution in Viscoelastic Composites Subjected to Impact Loading PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download A Multiscale Computational Model for Predicting Damage Evolution in Viscoelastic Composites Subjected to Impact Loading PDF full book. Access full book title A Multiscale Computational Model for Predicting Damage Evolution in Viscoelastic Composites Subjected to Impact Loading by . Download full books in PDF and EPUB format.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 31
Get Book Here
Book Description
The objective of the project was to develop a multiscale computational model capable of predicting the evolution of matrix cracking, delamination, and fiber cracking in viscoelastic composite structures subjected to ballistic impact. The model is three dimensional and computational in nature, utilizing the finite element method, and this model is being implemented to the explicit code DYNA3D. Crack growth is simulated via the cohesive zone model currently under development by the author. The cohesive zone model for predicting damage evolution in laminated composite plates is cast within a three dimensional continuum finite element algorithm capable of simulating the evolution of matrix, fiber, and delamination cracking in composite structures subjected to ballistic impact. Cracking on vastly differing length scales is accounted for by employing global-local techniques, with appropriate damage dependent homogenization techniques introduced to bridge the disparate scales. Finally, simplified generic example problems were solved analytically and compared to computational results obtained with the model as a means of model verification. A damage constitutive model for polymer-matrix composite materials was developed and implemented into a commercially available finite element package.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 31
Get Book Here
Book Description
The objective of the project was to develop a multiscale computational model capable of predicting the evolution of matrix cracking, delamination, and fiber cracking in viscoelastic composite structures subjected to ballistic impact. The model is three dimensional and computational in nature, utilizing the finite element method, and this model is being implemented to the explicit code DYNA3D. Crack growth is simulated via the cohesive zone model currently under development by the author. The cohesive zone model for predicting damage evolution in laminated composite plates is cast within a three dimensional continuum finite element algorithm capable of simulating the evolution of matrix, fiber, and delamination cracking in composite structures subjected to ballistic impact. Cracking on vastly differing length scales is accounted for by employing global-local techniques, with appropriate damage dependent homogenization techniques introduced to bridge the disparate scales. Finally, simplified generic example problems were solved analytically and compared to computational results obtained with the model as a means of model verification. A damage constitutive model for polymer-matrix composite materials was developed and implemented into a commercially available finite element package.
Author: Roberto Firmeza Soares
Publisher:
ISBN: 9781124124476
Category : Viscoelastic materials
Languages : en
Pages :
Get Book Here
Book Description
Author: Thomas John Berton
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Current governmental requirements for greater fuel efficiency are pushing automotive manufacturers to find innovative ways of reducing car weight, while still maintaining mechanical performance to ensure passenger safety. Composite materials would allow for significant weight reduction, while still maintaining a safe environment for the passengers. However, composite materials are known to exhibit significant time-dependent behaviour, as well as progressive damage which affect structural performance. Bio-composites in particular are known to undergo complex damage evolution during their lifetime. In this thesis, a multi-scale computational approach has been adopted to take these effects into account. A new modelling approach based on Synergistic Damage Mechanics to understand damage evolution in composite materials undergoing time-dependent deformation is developed. The model is applied to matrix micro-cracking in laminates. Computational micro-damage mechanics is combined with a continuum level description of stiffness degradation to predict the evolution of micro-cracking while requiring minimal experimental calibration. The time-dependent behaviour is modelled using Schapery's theory of viscoelasticity and viscoplasticity, and the evolution of matrix micro-cracking during creep is predicted. The predictions of the model for different stacking sequences, ply thicknesses and working temperatures show that viscoelasticity and viscoplasticity have a significant effect on the long-term response of laminates undergoing matrix micro-cracking. The multi-scale modelling approach is extended to short fiber bio-composites by constructing a micro-damage model of fiber-matrix debonding using a Cohesive Zone Model. The effect of strain rate on fiber-matrix debonding is analyzed by implementing a non-linear viscoelastic model for the matrix, and it is shown that viscoelastic behaviour leads to a competition between void nucleation and debonding. The effects of fiber stiffness, dimensions and interfacial shear strength are evaluated. Following the micro-damage analyses, the thesis focuses on damage evolution at the structural scale by implementing the damage model in Finite Element Analysis software to analyze the dynamic response of a car bumper. The rate-dependent evolution of damage is predicted for different stacking sequences and material systems.
Author: Ramesh Talreja
Publisher: Elsevier
ISBN: 0443184887
Category : Technology & Engineering
Languages : en
Pages : 620
Get Book Here
Book Description
Modeling Damage, Fatigue and Failure of Composite Materials, Second Edition provides the latest research in the field of composite materials, an area that has attracted a wealth of research, with significant interest in the areas of damage, fatigue, and failure. The book is fully updated, and is a comprehensive source of physics-based models for the analysis of progressive and critical failure phenomena in composite materials. It focuses on materials modeling while also reviewing treatments for analyzing failure in composite structures. Sections review damage development in composite materials such as generic damage and damage accumulation in textile composites and under multiaxial loading. Part Two focuses on the modeling of failure mechanisms in composite materials, with attention given to fiber/matrix cracking and debonding, compression failure, and delamination fracture. Final sections examine the modeling of damage and materials response in composite materials, including micro-level and multi-scale approaches, the failure analysis of composite materials and joints, and the applications of predictive failure models. Provides a comprehensive source of physics-based models for the analysis of progressive and critical failure phenomena in composite materials Assesses failure and life prediction in composite materials Discusses the applications of predictive failure models such as computational approaches to failure analysis Covers further developments in computational analyses and experimental techniques, along with new applications in aerospace, automotive, and energy (wind turbine blades) fields Covers delamination and thermoplastic-based composites
Author: Pengfei Liu
Publisher: Elsevier
ISBN: 0323853536
Category : Technology & Engineering
Languages : en
Pages : 398
Get Book Here
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: Bruno Francisco Bachiega de Araújo
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Author: Naake, Dominik Robert
Publisher: KIT Scientific Publishing
ISBN: 3731510057
Category : Technology & Engineering
Languages : en
Pages : 304
Get Book Here
Book Description
A weave reinforced composite material with a thermoplastic matrix is investigated by using a multiscale chain to predict the macroscopic material behavior. A large-strain framework for constitutive modeling with focus on material non-linearities, i.e. plasticity and damage is defined. The ability of the geometric and constitutive models to predict the deformation and failure behavior is demonstrated by means of selected examples.
Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
ISBN: 9781729236956
Category : Science
Languages : en
Pages : 48
Get Book Here
Book Description
A method for analysis of progressive failure in the Computational Structural Mechanics Testbed is presented in this report. The relationship employed in this analysis describes the matrix crack damage and fiber fracture via kinematics-based volume-averaged variables. Damage accumulation during monotonic and cyclic loads is predicted by damage evolution laws for tensile load conditions. The implementation of this damage model required the development of two testbed processors. While this report concentrates on the theory and usage of these processors, a complete list of all testbed processors and inputs that are required for this analysis are included. Sample calculations for laminates subjected to monotonic and cyclic loads were performed to illustrate the damage accumulation, stress redistribution, and changes to the global response that occur during the load history. Residual strength predictions made with this information compared favorably with experimental measurements. Lo, David C. and Coats, Timothy W. and Harris, Charles E. and Allen, David H. Langley Research Center RTOP 538-02-10-01
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722644987
Category :
Languages : en
Pages : 46
Get Book Here
Book Description
A method for analysis of progressive failure in the Computational Structural Mechanics Testbed is presented in this report. The relationship employed in this analysis describes the matrix crack damage and fiber fracture via kinematics-based volume-averaged variables. Damage accumulation during monotonic and cyclic loads is predicted by damage evolution laws for tensile load conditions. The implementation of this damage model required the development of two testbed processors. While this report concentrates on the theory and usage of these processors, a complete list of all testbed processors and inputs that are required for this analysis are included. Sample calculations for laminates subjected to monotonic and cyclic loads were performed to illustrate the damage accumulation, stress redistribution, and changes to the global response that occur during the load history. Residual strength predictions made with this information compared favorably with experimental measurements. Lo, David C. and Coats, Timothy W. and Harris, Charles E. and Allen, David H. Langley Research Center RTOP 538-02-10-01...
Author: Young Kwon
Publisher: Springer Science & Business Media
ISBN: 0387363181
Category : Technology & Engineering
Languages : en
Pages : 634
Get Book Here
Book Description
This book presents the state-of-the-art in multiscale modeling and simulation techniques for composite materials and structures. It focuses on the structural and functional properties of engineering composites and the sustainable high performance of components and structures. The multiscale techniques can be also applied to nanocomposites which are important application areas in nanotechnology. There are few books available on this topic.
