Cohesive Zone Model For Carbon Nanotube Adhesive Simulation And Fracture Fatigue Crack Growth
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Cohesive Zone Model For Carbon Nanotube Adhesive Simulation And Fracture Fatigue Crack Growth
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Author : Haodan Jiang
language : en
Publisher:
Release Date : 2010
Cohesive Zone Model For Carbon Nanotube Adhesive Simulation And Fracture Fatigue Crack Growth written by Haodan Jiang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Cohesion categories.
"The Cohesive Zone Model (CZM) describes material separation with a traction-separation law and links the micro-structural failure mechanism to the continuum deformation field. The evolvement of the CZM and its specific features were introducted in the first chapter of this dissertation and followed by applications for interface decohesion and crack growth study. Chapter II adopted a bilinear CZM for description of the decohesion properties of the innovative carbon nanotube (CNT) dry adhesive. Macroscopic modeling of the uncoupled normal and shear adhesive behaviors were implemented using finite element method. The cohesive zone model completes a multi-scale modeling scheme together with coarse grained molecular dynamics (CGMD). Three-dimensional simulations of quasi-static fracture process were studied next by formulating an exponential cohesive law. Crack growth under monotonic loading was modeled and cohesive parameters were calibrated by comparing with experiments. The CZM simulation captured the crack initiation as well as the process of crack propagation. A damage-updated irreversible cohesive law was formulated in Chapter IV for simulations of cyclic crack growth. Material degradation was described with a damage evolution mechanism, revealing the history dependence of fatigue crack growth. The irreversible CZM was verified through one-element model under load-controlled and displacement-controlled fatigue loading and was further validated with fatigue crack growth simulations for different speciment modes. Simulation results captured the gradual damage accumulation and stable fatigue crack propagation, consistent with the power law method. Further application of the irreversible CZM for overload effect during fatigue crack propagation was presented in Chapter V. Stress redistribution caused by the overload in a compact-tension-shear (CTS) specimen was investigated. Fatigue crack growth retardation was studied in terms of overload ratios and the mode of the overload. A damage extrapolation scheme was formulated for the high-cycle fatigue loading and greatly reduced the computation cost. The last chapter investigated crack path deviation phenomena with possible CZM simulation approaches. Numerical issues and mesh-related convergence problem were referred for future investigation."--Abstract.
Icaf 2019 Structural Integrity In The Age Of Additive Manufacturing
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Author : Antoni Niepokolczycki
language : en
Publisher: Springer
Release Date : 2019-07-03
Icaf 2019 Structural Integrity In The Age Of Additive Manufacturing written by Antoni Niepokolczycki and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-07-03 with Technology & Engineering categories.
This book gathers papers presented at the 36th conference and 30th Symposium of the International Committee on Aeronautical Fatigue and Structural integrity. Focusing on the main theme of “Structural Integrity in the Age of Additive Manufacturing”, the chapters cover different aspects concerning research, developments and challenges in this field, offering a timely reference guide to designers, regulators, manufacturer, and both researchers and professionals of the broad aerospace community.
European Workshop On Structural Health Monitoring
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Author : Piervincenzo Rizzo
language : en
Publisher: Springer Nature
Release Date : 2022-06-18
European Workshop On Structural Health Monitoring written by Piervincenzo Rizzo and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-06-18 with Technology & Engineering categories.
This volume gathers the latest advances, innovations, and applications in the field of structural health monitoring (SHM) and more broadly in the fields of smart materials and intelligent systems, as presented by leading international researchers and engineers at the 10th European Workshop on Structural Health Monitoring (EWSHM), held in Palermo, Italy on July 4-7, 2022. The volume covers highly diverse topics, including signal processing, smart sensors, autonomous systems, remote sensing and support, UAV platforms for SHM, Internet of Things, Industry 4.0, and SHM for civil structures and infrastructures. The contributions, which are published after a rigorous international peer-review process, highlight numerous exciting ideas that will spur novel research directions and foster multidisciplinary collaboration among different specialists.
Fracture Mechanics Of Carbon Fibre Reinforced Plastics To Ti Alloy Adhesive Joints
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Author :
language : en
Publisher:
Release Date : 2013
Fracture Mechanics Of Carbon Fibre Reinforced Plastics To Ti Alloy Adhesive Joints written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Multiscale Materials Modeling
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Author : Siegfried Schmauder
language : en
Publisher: Walter de Gruyter GmbH & Co KG
Release Date : 2016-08-22
Multiscale Materials Modeling written by Siegfried Schmauder and has been published by Walter de Gruyter GmbH & Co KG this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-08-22 with Science categories.
This book presents current spatial and temporal multiscaling approaches of materials modeling. Recent results demonstrate the deduction of macroscopic properties at the device and component level by simulating structures and materials sequentially on atomic, micro- and mesostructural scales. The book covers precipitation strengthening and fracture processes in metallic alloys, materials that exhibit ferroelectric and magnetoelectric properties as well as biological, metal-ceramic and polymer composites. The progress which has been achieved documents the current state of art in multiscale materials modelling (MMM) on the route to full multi-scaling. Contents: Part I: Multi-time-scale and multi-length-scale simulations of precipitation and strengthening effects Linking nanoscale and macroscale Multiscale simulations on the coarsening of Cu-rich precipitates in α-Fe using kinetic Monte Carlo, Molecular Dynamics, and Phase-Field simulations Multiscale modeling predictions of age hardening curves in Al-Cu alloys Kinetic Monte Carlo modeling of shear-coupled motion of grain boundaries Product Properties of a two-phase magneto-electric composite Part II: Multiscale simulations of plastic deformation and fracture Niobium/alumina bicrystal interface fracture Atomistically informed crystal plasticity model for body-centred cubic iron FE2AT ・ finite element informed atomistic simulations Multiscale fatigue crack growth modeling for welded stiffened panels Molecular dynamics study on low temperature brittleness in tungsten single crystals Multi scale cellular automata and finite element based model for cold deformation and annealing of a ferritic-pearlitic microstructure Multiscale simulation of the mechanical behavior of nanoparticle-modified polyamide composites Part III: Multiscale simulations of biological and bio-inspired materials, bio-sensors and composites Multiscale Modeling of Nano-Biosensors Finite strain compressive behaviour of CNT/epoxy nanocomposites Peptide・zinc oxide interaction
Prediction Of Elastic Properties Of A Carbon Nanotube Reinforced Fiber Polymeric Composite Material Using Cohesive Zone Modeling
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Author :
language : en
Publisher:
Release Date : 2009
Prediction Of Elastic Properties Of A Carbon Nanotube Reinforced Fiber Polymeric Composite Material Using Cohesive Zone Modeling written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
Fiber composite materials are ideal engineered materials to carry loads and stresses in the fiber direction due to their high in-plane specific mechanical properties. However, premature failure due to low transverse mechanical properties constitutes a fundamental weakness of composites. A solution to this problem is being addressed through the creation of a nano-reinforced laminated composite (NRLC) materials where carbon nanotubes (CNTs) are grown on the surface of the fiber filaments to improve the matrix-dominated properties. The carbon nanotubes increase the effective diameter of the fiber and provide a much larger interface area for the polymeric matrix to wet the fiber. The objective of this thesis work is to numerically predict the elastic properties of these nano-reinforced fiber composites. Finite Element Method (FEM) is used to evaluate the effective mechanical properties employing a 2D and 3D cylindrical representative volume element (RVE) based on multiscale modeling approach. In continuum mechanics, perfect bonding is assumed between the carbon fiber and the polymer matrix and between the carbon nanotubes and the polymer matrix. In the multiscale modeling approach in this work, cohesive zone approach is employed to model the interface between carbon fiber and polymer matrix and between the CNTs and the polymer matrix. Traction-displacement plots obtained from molecular dynamics simulations are used to derive the constitutive properties of the cohesive zone material model used for CNT-Polymer interface. For NRLC, the cohesive zone material model properties are assumed based on the information found in the literature. Effective material constants are extracted from the solutions of the RVE for different loading cases using theory of elasticity of isotropic and transversely isotropic materials. Experimental mechanical characterization data is used for correlation and validation of numerical results. It is observed that the cohesive zone material model is capable of capturing the interface behavioral details and provides more realistic results for the mechanical response of composite materials. Experimental results show that the potential improvement in matrix-dominated properties of the NRLC suggested by the numerical study can be realized only with the availability of improved and sophisticated NRLC fabrication techniques.
Structural Adhesive Joints
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Author : K. L. Mittal
language : en
Publisher: John Wiley & Sons
Release Date : 2020-09-01
Structural Adhesive Joints written by K. L. Mittal and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-09-01 with Technology & Engineering categories.
This timely book on structural adhesives joints showcases all the pertinent topics and will be of immense value to scientists and engineers in many industries. Most structures are comprised of a number of individual parts or components which have to be connected to form a system with integral load transmission path. The structural adhesive bonding represents one of the most enabling technologies to fabricate most complex structural configurations involving advanced materials (e.g. composites) for load-bearing applications. Quite recently there has been a lot of activity in harnessing nanotechnology (use of nanomaterials) in ameliorating the existing or devising better performing structural adhesives. The 10 chapters by subject matter experts look at the following issues: Surface preparation for structural adhesive joints (SAJ) Use of nanoparticles in enhancing performance of SAJ Optimization of SAJ Durability aspects of SAJ Debonding of SAJ Fracture mechanics of SAJ Failure analysis of SAJ Damage behavior in functionally graded SAJ Impact, shock and vibration characteristics of composites for SAJ Delamination arrest methods in SAJ
Experimental Investigation Of Mode Ii Fracture And Fatigue In Unidirectional Carbon Epoxy Composite Beams
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Author : Ryan Howe
language : en
Publisher:
Release Date : 2021
Experimental Investigation Of Mode Ii Fracture And Fatigue In Unidirectional Carbon Epoxy Composite Beams written by Ryan Howe and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
This paper investigates mode II quasi-brittle fracture and fatigue in laminated compositestructures and characterizes the phenomena in the form of size effect and Cohesive Zone Models (CZMs). This research focuses primarily on mode II quasi-static fracture, but also includes a preliminary experimental investigation of quasi-static fatigue and numerical investigation of forced-dynamic fatigue. For these case studies, composite beam specimens were manufactured in-house using a closed-molding process to create End-Notched Flexure (ENF) test specimens of different sizes, using Toray T700G and T800S carbon/epoxy prepregs. An initial pre-crack was induced using a Teflon insert at the midplane of each specimen, with predetermined crack lengths. Each case aimed to study crack crowth via fracture or fatigue using geometrically scaled sizes to study the size effect phenomena. For the quasi-static fracture case, an additional analysis was applied to identify the influence of Teflon thickness on the fracture energy using two Teflon films with thicknesses of 76 um and 12.5 um, respectively. Experimental data was obtained through ENF tests following American Society for Testing and Materials (ASTM) D7905 parameters, while utilizing microscopic 2D and full-field 3D Digital Image Correlation (DIC) technology to obtain both local and global behavior of the beams. The fracture energy for each Teflon case was analyzed using both Linear Elastic Fracture Mechanics (LEFM) and Bažant’s Type II Size Effect Law (SEL). It was found that using LEFM resulted in different values for differing scaled geometric specimen sizes, contradicting fracture energy as a material property. To address this issue, Bažant’s Type II SEL was applied to the experimental data which produced a single value for fracture energy as a material property. The impact of Teflon size was also observed under this analysis. It was found the thick Teflon, 76 um, created a larger resin pocket in the front of the crack tip, causing a more complex stress profile at the crack tip. Thus, a larger fracture energy was predicted for the thick insert case by size effect analysis. From these experimental results, a CZM was formulated based on the 12.5 um thin Teflon case. This removed the impact of the resin pocket and complex stress distribution found with the 76 um Teflon insert. The CZM parameters were characterized based on microscopic DIC data of the crack tip region obtained from the small size fracture testing. The 3D DIC data was used for validation of global behavior simulated using the CZM, while the experimental result of the thick Teflon insert case provided an additional data set for robust validation of the CZM. The results of this investigation suggest a piece-wise CZM shape to account for the size effect influence. A preliminary experimental quasi-static fatigue investigation was also conducted using displacement controlled tests on size affected specimens. The results of these fatigue tests enabled the formulation of the threshold and stable crack growth regions of the fatigue Paris Curve for three different specimen sizes. This identified increasing values for threshold Stress Intensity Factors, Kth, and increasing slopes for the linear fatigue crack growth for increasing specimen size, further demonstrating the size effect influence. Future work is outlined to develop all regions of the fatigue Paris Curve using both displacement and load controlled testing methods.
Hybrid Polymeric Nanocomposites From Agricultural Waste
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Author : Sefiu Adekunle Bello
language : en
Publisher: CRC Press
Release Date : 2022-10-17
Hybrid Polymeric Nanocomposites From Agricultural Waste written by Sefiu Adekunle Bello and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-10-17 with Technology & Engineering categories.
Hybrid Polymeric Nanocomposites from Agricultural Waste examines the use of agricultural by-products for green production of new materials. It covers nanoparticle synthesis from agricultural wastes and nanocomposite development with a focus on polyethylene, polylactic acid, polymethylmethacrylate, and epoxy resins, and considers possible biomedical and engineering applications. Showcases agricultural waste as polymer reinforcements to replace expensive synthetic fibres that discourage wide polymeric nanocomposite applications Discusses green synthesis and characterisation of hybrid nanocomposites from polylactic acid, polymethylmethacrylate, recycled/new polyethylene, and epoxy resins Contrasts hybrid nanocomposites properties with standard nanocomposites, using automotive case studies The book is aimed at researchers, advanced students, and industrial professionals in materials, polymer, and mechanical engineering and related areas interested in the development and application of sustainable materials.
Iccs20 20th International Conference On Composite Structures
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Author : Nicholas Fantuzzi
language : en
Publisher: Società Editrice Esculapio
Release Date : 2017-07-24
Iccs20 20th International Conference On Composite Structures written by Nicholas Fantuzzi and has been published by Società Editrice Esculapio this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-07-24 with Technology & Engineering categories.
Composite materials have aroused a great interest over the last few decades, as proven by the huge number of scientific papers and industrial progress. The increase in the use of composite structures in different engineering practices justify the present international meeting where researches from every part of the globe can share and discuss the recent advancements regarding the use of structural components within advanced applications such as buckling, vibrations, repair, reinforcements, concrete, composite laminated materials and more recent metamaterials. Studies about composite structures are truly multidisciplinary and the given contributions can help other researches and professional engineers in their own field. This Conference is suitable as a reference for engineers and scientists working in the professional field, in the industry and the academia and it gives the possibility to share recent advancements in different engineering practices to the outside world. This book aims to collect selected plenary and key-note lectures of this International Conference. For this reason, the establishment of this 20th edition of International Conference on Composite Structures has appeared appropriate to continue what has been begun during the previous editions. ICCS wants to be an occasion for many researchers from each part of the globe to meet and discuss about the recent advancements regarding the use of composite structures, sandwich panels, nanotechnology, bio-composites, delamination and fracture, experimental methods, manufacturing and other countless topics that have filled many sessions during this conference. As a proof of this event, which has taken place in Paris (France), selected plenary and key-note lectures have been collected in the present book.