Physics-based Simulation and Experiment on Blast Protection of Infill Walls and Sandwich Composites Using New Generation of Nano Particle Reinforced Materials PDF Download
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Author: Mohammad Irshidat
Publisher:
ISBN:
Category :
Languages : en
Pages : 296
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Book Description
A critical issue for the development of nanotechnology is our ability to understand, model, and simulate the behavior of small structures and to make the connection between nano structure properties and their macroscopic functions. Material modeling and simulation helps to understand the process, to set the objectives that could guide laboratory efforts, and to control material structures, properties, and processes at physical implementation. These capabilities are vital to engineering design at the component and systems level. In this research, experimental-computational-analytical program was employed to investigate the performance of the new generation of polymeric nano-composite materials, like nano-particle reinforced elastomeric materials (NPREM), for the protection of masonry structures against blast loads. New design tools for using these kinds of materials to protect Infill Walls (e.g. masonry walls) against blast loading were established. These tools were also extended to cover other type of panels like sandwich composites. This investigation revealed that polymeric nano composite materials are strain rate sensitive and have large amount of voids distributed randomly inside the materials. Results from blast experiments showed increase in ultimate flexural resistance achieved by both unreinforced and nano reinforced polyurea retrofit systems applied to infill masonry walls. It was also observed that a thin elastomeric coating on the interior face of the walls could be effective at minimizing the fragmentation resulting from blast. More conclusions are provided with recommended future research.
Author: Mohammad Irshidat
Publisher:
ISBN:
Category :
Languages : en
Pages : 296
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Book Description
A critical issue for the development of nanotechnology is our ability to understand, model, and simulate the behavior of small structures and to make the connection between nano structure properties and their macroscopic functions. Material modeling and simulation helps to understand the process, to set the objectives that could guide laboratory efforts, and to control material structures, properties, and processes at physical implementation. These capabilities are vital to engineering design at the component and systems level. In this research, experimental-computational-analytical program was employed to investigate the performance of the new generation of polymeric nano-composite materials, like nano-particle reinforced elastomeric materials (NPREM), for the protection of masonry structures against blast loads. New design tools for using these kinds of materials to protect Infill Walls (e.g. masonry walls) against blast loading were established. These tools were also extended to cover other type of panels like sandwich composites. This investigation revealed that polymeric nano composite materials are strain rate sensitive and have large amount of voids distributed randomly inside the materials. Results from blast experiments showed increase in ultimate flexural resistance achieved by both unreinforced and nano reinforced polyurea retrofit systems applied to infill masonry walls. It was also observed that a thin elastomeric coating on the interior face of the walls could be effective at minimizing the fragmentation resulting from blast. More conclusions are provided with recommended future research.
Author: Michael G. Oesterle
Publisher:
ISBN:
Category :
Languages : en
Pages : 655
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Book Description
Loads generated in explosions that result from terrorist attacks and industrial accidents create devastating hazards for buildings and their occupants. The objective of this dissertation is to develop design guidelines and methodologies for protective/hardening strategies used to mitigate blast hazards in reinforced concrete and concrete masonry walls. Commonly, guidelines and methodologies are developed from experimental data. Field testing with live explosive is a reliable experimental method for demonstrating the performance of blast resistant concepts, but it is expensive, time consuming, and often produces low quality data. Static testing is another experimental method that allows researchers to clearly observe behavior and failure modes of structural components; however this too is limited because it cannot account for the rate effects associated with blast loads. The UCSD Blast Simulator was developed to offers an alternative method for testing structures to loads generated in an explosion without the difficulties and limitations associated with field and static testing. For this dissertation, tests were conducted with the blast simulator to study reinforced concrete walls protected with frangible panels, concrete masonry walls strengthened with carbon fiber reinforced polymer composite, and unreinforced masonry walls retrofitted with polyurea catcher systems. The objective of the dissertation was achieved through a succession of tasks that included; the development of a test protocol, validation and implementation of numerical models to predict loads delivered to specimens during blast simulator tests, development of method to correlate blast simulator loads to air blast loads, generation of high quality data on specimens with mitigation strategies for validation of numerical models to predict response of hardened/protected reinforced concrete and concrete masonry walls, and investigation of design variables with parametric studies. The investigation of concrete masonry walls demonstrated that the addition of carbon fiber reinforced polymers can increase the resistance to blast loads, but may result in a brittle failure mode. The study of reinforced concrete walls showed that frangible panels can improve the response by adding mass to the system. Finally, the research performed on unreinforced masonry walls with polyurea catcher emphasized the need for proper connection detailing.
Author: Karthik Ram Ramakrishnan
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Sandwich structures are lightweight structures composed of two thin, relatively dense, high strength facesheets that are glued on either side of a thick, low density core, such as foams or honeycombs. Sandwich panels with fibre reinforced plastic skins and core of polymer foam represent an important class of lightweight structural materials in many areas of such as aeronautics and aerospace, automotive and marine structures. However, some of these sandwich structures have very limited energy absorption capacity. This limitation becomes critical because these structures are susceptible to be subjected to impact. The impact damage in the case of sandwich structures may be due, in particular, to dropped tools, flights debris, bird strike, hailstorms or ballistic impacts.The resins used as the matrix in the case of sandwich panels with laminated composite facesheets are usually thermosetting resins such as epoxy resins. Due to the fragile nature of the matrix, the presence of even a slight internal delamination spreads at right angles to the applied compressive stress with disastrous results for the sandwich structure. One of the proposed solutions is the modification of the thermosetting resins with the addition of organic and inorganic particles of nanometric size. A new method of synthesis of block copolymers that self-assemble at the nanoscale would substantially reduce the problems associated with the dispersion of nanoparticles.The objective of this work is to study and better understand the improvement of impact resistance of sandwich panels with skin laminates with the addition of tri-block copolymer (Nanostrength®) in the epoxy matrix of fibre / epoxy composite. The effect of nanoparticles on the mechanical performance of the sandwich Kevlar / epoxy or glass / epoxy facesheets and Rohacell® foam core panels will be investigated by comparing the results between pure resin and resin modified by the addition of 10% Nanostrength performed using experimental testing and numerical modelling. This work will focus on two different types of impact loading; low velocity impacts with normal angle of incidence to the sample surface and low velocity impacts with parabolic trajectory. A device for three-dimensional impact has been developed to study the mechanical response of sandwich panels subjected to a parabolic trajectory impact.The finite element method is a widely used method to study the impact on structures including sandwich structures. An LS-Dyna model was developed to simulate the normal impact of composite laminates and Kevlar / Epoxy - Rohacell® foam sandwich plates. A constitutive law based on damage mechanics, available in the material library of LS-Dyna called "Composite Laminated Fabric" (MAT58) was used to represent the behaviour of composite facesheets. The input parameters of the model MAT58 were obtained by combination of tests and parametric studies. The model "Crushable foam" (MAT63) was used for the core. The macroscopic model with a phenomenological law is able to simulate the mechanical response of composite laminates and sandwich plates subjected to low velocity impacts. It may be noted that the development of sandwich panels reinforced with triblock copolymer in the matrix is a promising field of study.
Author: Vasant Matsagar
Publisher: Springer
ISBN: 8132221877
Category : Technology & Engineering
Languages : en
Pages : 1033
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Book Description
The book presents research papers presented by academicians, researchers, and practicing structural engineers from India and abroad in the recently held Structural Engineering Convention (SEC) 2014 at Indian Institute of Technology Delhi during 22 – 24 December 2014. The book is divided into three volumes and encompasses multidisciplinary areas within structural engineering, such as earthquake engineering and structural dynamics, structural mechanics, finite element methods, structural vibration control, advanced cementitious and composite materials, bridge engineering, and soil-structure interaction. Advances in Structural Engineering is a useful reference material for structural engineering fraternity including undergraduate and postgraduate students, academicians, researchers and practicing engineers.
Author: Alper Ilki
Publisher: Springer Nature
ISBN: 3030881660
Category : Technology & Engineering
Languages : en
Pages : 2516
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Book Description
This volume highlights the latest advances, innovations, and applications in the field of FRP composites and structures, as presented by leading international researchers and engineers at the 10th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering (CICE), held in Istanbul, Turkey on December 8-10, 2021. It covers a diverse range of topics such as All FRP structures; Bond and interfacial stresses; Concrete-filled FRP tubular members; Concrete structures reinforced or pre-stressed with FRP; Confinement; Design issues/guidelines; Durability and long-term performance; Fire, impact and blast loading; FRP as internal reinforcement; Hybrid structures of FRP and other materials; Materials and products; Seismic retrofit of structures; Strengthening of concrete, steel, masonry and timber structures; and Testing. The contributions, which were selected by means of a rigorous international peer-review process, present a wealth of exciting ideas that will open novel research directions and foster multidisciplinary collaboration among different specialists.
Author: Joachim Roesler
Publisher: Springer Science & Business Media
ISBN: 3540734481
Category : Science
Languages : en
Pages : 540
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Book Description
How do engineering materials deform when bearing mechanical loads? To answer this crucial question, the book bridges the gap between continuum mechanics and materials science. The different kinds of material deformation are explained in detail. The book also discusses the physical processes occurring during the deformation of all classes of engineering materials and shows how these materials can be strengthened to meet the design requirements. It provides the knowledge needed in selecting the appropriate engineering material for a certain design problem. This book is both a valuable textbook and a useful reference for graduate students and practising engineers.
Author: Kaustubh Dasgupta
Publisher: Springer Nature
ISBN: 3030551156
Category : Technology & Engineering
Languages : en
Pages : 959
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Book Description
This book gathers peer-reviewed contributions presented at the 1st International Conference on Structural Engineering and Construction Management (SECON’20), held in Angamaly, Kerala, India, on 14-15 May 2020. The meeting served as a fertile platform for discussion, sharing sound knowledge and introducing novel ideas on issues related to sustainable construction and design for the future. The respective contributions address various aspects of numerical modeling and simulation in structural engineering, structural dynamics and earthquake engineering, advanced analysis and design of foundations, BIM, building energy management, and technical project management. Accordingly, the book offers a valuable, up-to-date tool and essential overview of the subject for scientists and practitioners alike, and will inspire further investigations and research.
Author: Sofiane Amziane
Publisher: Trans Tech Publications Ltd
ISBN: 3035736995
Category : Science
Languages : en
Pages : 902
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Book Description
Selected peer-reviewed full text papers from the 4th International Conference on Bio-Based Building Materials (ICBBM 2021) Selected peer-reviewed full text papers from the 4th International Conference on Bio-Based Building Materials (ICBBM 2021), June 16-18, 2021, Barcelona, Spain
Author: T. Bangash
Publisher: Springer Science & Business Media
ISBN: 3540312897
Category : Technology & Engineering
Languages : en
Pages : 799
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Book Description
This excellent book highlights all aspects of the analysis and design of buildings subject to impact, explosion and fire. It is a definitive reference book and contains 10 chapters from a wide international prospective. Three-dimensional finite element and discrete element techniques are included. They are applied to buildings such as the World Trade Center (WTC Twin Towers) and the Federal Building in Oklahoma on the basis of the designers drawings, data and other information. Many small case studies are also included. The book has a comprehensive bibliography and a large appendix providing background analysis and computer subroutines of recently developed programs.
Author: A. Praveen Kumar
Publisher: Springer Nature
ISBN: 9811578273
Category : Technology & Engineering
Languages : en
Pages : 827
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Book Description
This book presents select proceedings of the International Conference on Advanced Lightweight Materials and Structures (ICALMS) 2020, and discusses the triad of processing, structure, and various properties of lightweight materials. It provides a well-balanced insight into materials science and mechanics of both synthetic and natural composites. The book includes topics such as nano composites for lightweight structures, impact and failure of structures, biomechanics and biomedical engineering, nanotechnology and micro-engineering, tool design and manufacture for producing lightweight components, joining techniques for lightweight structures for similar and dissimilar materials, design for manufacturing, reliability and safety, robotics, automation and control, fatigue and fracture mechanics, and friction stir welding in lightweight sandwich structures. The book also discusses latest research in composite materials and their applications in the field of aerospace, construction, wind energy, automotive, electronics and so on. Given the range of topics covered, this book can be a useful resource for beginners, researchers and professionals interested in the wide ranging applications of lightweight structures.
