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Author : Oral Buyukozturk
Publisher :
ISBN 13 :
Total Pages : 232 pages
Book Rating : 4.3/5 (91 download)
Download or read book Interface Fracture and Bond written by Oral Buyukozturk and published by . This book was released on 1995 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : David Steven Hurd
Publisher :
ISBN 13 :
Total Pages : 438 pages
Book Rating : 4.:/5 (319 download)
Download or read book A Fracture Mechanics Study of a Strong Interface written by David Steven Hurd and published by . This book was released on 1994 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Leslie Banks-Sills
Publisher : Springer
ISBN 13 : 3319603272
Total Pages : 125 pages
Book Rating : 4.3/5 (196 download)
Download or read book Interface Fracture and Delaminations in Composite Materials written by Leslie Banks-Sills and published by Springer. This book was released on 2017-07-05 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: Part I of this SpringerBrief presents the problem of a crack between two dissimilar isotropic materials and describes the mathematical background. A fracture criterion is discussed and Methods for calculating fracture parameters such as stress intensity factors using the finite element method and three post-processors are considered. Actual test data and both deterministic and statistical failure curves are presented.In Part II of the book, similar descriptions are given for delaminations in composite laminates. The mathematical treatment of this type of damage including the first term of the asymptotic expansion of the stress and displacement fields is considered. Numerical post-processors for determining stress intensity factors for these cases are reviewed. Two examples of specific laminates are presented: one with a failure curve and the other with a failure surface. Finally, beam specimens used for testing such failures are discussed.
Author : M. Rühle
Publisher : Elsevier
ISBN 13 : 1483287467
Total Pages : 448 pages
Book Rating : 4.4/5 (832 download)
Download or read book Metal-Ceramic Interfaces written by M. Rühle and published by Elsevier. This book was released on 2013-10-22 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: As engineering materials and structures often contain a metal or metallic alloy bonded to a ceramic, the resultant interface must be able to sustain mechanical forces without failure. They also play an important role in oxidation or reduction of materials. The workshop on 'Bonding, Structure and Mechanical Properties of Metal/Ceramic Interfaces' was held in January 1989 within the Acta/Scripta Metallurgica conference series. It drew together an international collection of 70 scientists who discussed a wide range of issues related to metal-ceramic interfaces. The sessions were divided into 7 categories: structure and bonding, chemistry at interfaces, formation of interfaces, structure of interfaces, thermodynamics/atomistics of interface fracture, mechanics of interface cracks, and fracture resistance of bimaterial interfaces. Within these headings attention was paid to grain boundaries, the influence of chemical processes on the behaviour of interfaces, diffusion bonding, characterization of fracture, and crack propagation by fatigue and by stress corrosion. The book presents a useful reference source for materials scientists, physicists, chemists, and mechanical engineers who are concerned with the roles and properties of interfaces.
Author : Tianhao Yang
Publisher :
ISBN 13 :
Total Pages : 320 pages
Book Rating : 4.:/5 (115 download)
Download or read book Rate-dependent Fracture of a Silicon/epoxy Interface Under Mixed-mode Loading Conditions written by Tianhao Yang and published by . This book was released on 2020 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rate-dependent fracture has been observed for many polymer-based interfaces, where both the interfacial strength and adhesion energy (or fracture toughness) often increase with increasing separation rates, while the opposite trend typically defines the behavior of the bulk polymer. This dissertation mainly addresses the following two aspects: the characterization of the rate-dependent fracture for a silicon/epoxy interface under mixed-mode loading conditions, and the development of a multiscale, mechanism-based model for simulating rate-dependent fracture at interfaces. First, nominally mode-I fracture experiments were conducted with double cantilever beam (DCB) specimens. Symmetric displacement control was enforced at the loading point, while the separation rate was varied in order to examine the rate dependence. A beam on elastic foundation (BEF) analysis was adopted for estimating the crack length and J-integral. An iterative approach was used to extract the interfacial traction-separation relations (TSR), which exhibited a noticeable rate dependence as both the interfacial strength and fracture toughness increased with increasing separation rates. Motivated by this observation, a rate dependent cohesive zone model was developed, where the damage evolution within the cohesive zone is determined by a thermally activated bond rupture process. The rate-dependent cohesive zone model was implemented via a finite difference method to solve the DCB problem numerically. The model parameters were extracted by comparing the numerical results with measurements. Next, to improve the modeling of the rate-dependent fracture, a multiscale mechanism-based approach was proposed to include the entropic effects of polymer chains and a nonlinear energy barrier for bond rupture. A rate-dependent cohesive zone model was developed from the bottom up at four levels: the bond level, the chain level, the interface level, and the specimen level. Bonds are described by a potential energy function (e.g., Lennard-Jones potential) with an equilibrium bond length and a bond energy. A series of bonds form a molecular chain, which is modeled as a freely jointed chain (FJC) with stretchable bonds. Then, with a large number of molecular chains at the interface level, the chain survival probability follows the thermally activated bond rupture kinetics with a microscopic time scale, leading to a rate-dependent damage process for the interface. Here, an interface with statistically distributed chain lengths is also considered. To compare with the fracture experiments at the specimen level, the interface model was implemented via a user-defined surface interaction subroutine (UINTER) in the finite element package ABAQUS for numerical simulations. With a few parameters extracted for the molecular structures of the interface, the model was able to reproduce the rate-dependent fracture of the silicon/epoxy interface under mode-I conditions. Finally, the rate-dependent fracture for the same interface was examined under mixed-mode loading conditions. A dual-actuator loading device was designed and developed to achieve a full range of the mode-mix with DCB specimens, where the two displacements at the loading end can be controlled independently. For each mode mix, the ratio of the end displacements between the upper and lower beams was kept a constant, while the rate effect was examined by varying the displacement rates proportionally. The nominal phase angle of mode mix at the initial crack tip was correlated to the displacement ratio based on the linear elastic fracture mechanics (LEFM) analysis. The balance condition was naturally satisfied via the symmetry of the specimen configuration (silicon/epoxy/silicon), so that the direct extraction of the crack-tip TSRs was made possible by a decoupled beam interaction analysis using only the far-field measurements including forces, displacements and rotations at the loading end of the specimen. The mixed-mode interfacial fracture was found to be rate dependent as both normal and shear components of the interfacial strength and toughness increased with increasing displacement rates. A BEF analysis with an extension for shear interactions was used to estimate the crack growth and the local separation rates in both the normal and tangential directions. It turned out that the local separation rates varied as damage evolved across the interface, thus leading to a locally history dependent fracture behavior. These findings underline the importance of the local separation rate and history on the interfacial properties and provide insights for further model developments
Author : Meng Han
Publisher :
ISBN 13 :
Total Pages : 356 pages
Book Rating : 4.:/5 (574 download)
Download or read book Fracture Mechanics Based-model of FRP Sheets-concrete Interface Bond written by Meng Han and published by . This book was released on 2009 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Anastasios P. Vassilopoulos
Publisher : Elsevier
ISBN 13 : 0857098128
Total Pages : 553 pages
Book Rating : 4.8/5 (57 download)
Download or read book Fatigue and Fracture of Adhesively-Bonded Composite Joints written by Anastasios P. Vassilopoulos and published by Elsevier. This book was released on 2014-10-21 with total page 553 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is commonly accepted that the majority of engineering failures happen due to fatigue or fracture phenomena. Adhesive bonding is a prevailing joining technique, widely used for critical connections in composite structures. However, the lack of knowledge regarding fatigue and fracture behaviour, and the shortage of tools for credible fatigue design, hinders the potential benefits of adhesively bonded joints. The demand for reliable and safe structures necessitates deep knowledge in this area in order to avoid catastrophic structural failures. This book reviews recent research in the field of fatigue and fracture of adhesively-bonded composite joints. The first part of the book discusses the experimental investigation of the reliability of adhesively-bonded composite joints, current research on understanding damage mechanisms, fatigue and fracture, durability and ageing as well as implications for design. The second part of the book covers the modelling of bond performance and failure mechanisms in different loading conditions. - A detailed reference work for researchers in aerospace and engineering - Expert coverage of different adhesively bonded composite joint structures - An overview of joint failure
Download or read book Mode I Fracture and Durability of the CFRP-concrete Interface Bond written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Wu
Publisher : Routledge
ISBN 13 : 1351423525
Total Pages : 654 pages
Book Rating : 4.3/5 (514 download)
Download or read book Polymer Interface and Adhesion written by Wu and published by Routledge. This book was released on 2017-11-22 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt: Poly mer Interface and Adhesion provides the critical basis for further advancement in thisfield. Combining the principles of interfacial science, rheology, stress analysis, and fracturemechanics, the book teaches a new approach to the analysis of long standing problemssuch as: how is the interface formed; what are its physical and mechanical properties;and how does the interface modify the stress field and fracture strength of the material.The book offers many outstanding features, including extensive listings of pertinent references,exhaustive tabulations of the interfacial properties of polymers, critical reviews ofthe many conflicting theories, and complete discussions of coupling agents, adhesion promotion,and surface modifications. Emphasis is placed on physical concepts and mechanisms,using clear, understandable mathematics.Polymer Interface and Adhesion promotes a more thorough understanding of the physical,mechanical, and adhesive properties of multiphase, polymer systems. Polymer scientistsand engineers, surface chemists, materials scientists, rheologists, as well as chemical andmechanical engineers interested in the research, development or industrial applications ofpolymers, plastics, fibers, coatings, adhesives, and composites need this important newsource book.
Download or read book Evaluation of Bond Between Pavement Layers: Fracture Mechanics Approach written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ashutosh Jain
Publisher : LAP Lambert Academic Publishing
ISBN 13 : 9783843373906
Total Pages : 124 pages
Book Rating : 4.3/5 (739 download)
Download or read book Interfacial Energy for Oraganosilane Tailored Copper-Silica Interface written by Ashutosh Jain and published by LAP Lambert Academic Publishing. This book was released on 2010-11 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: The partitioning of interface fracture energy into bond breaking energy and plastic energy in ductile layer(s) constituting the interface is a central problem in fracture mechanics. A new approach to partition the fracture energy of a metal-ceramic interface into work of adhesion and plasticity is introduced, unveiling the nanomechanics of interfacial deformation and fracture. The crack path uncertainties are obviated by constraining fracture to occur in an interfacial molecular layer through fissure of a single bond type whose strength is varied by adjusting the chemical environment. This approach is adaptable for studying interfacial fracture and related phenomena in diverse materials systems in different thermochemical environments.
Author : Lawrence J. Broutman
Publisher : Elsevier
ISBN 13 : 1483216713
Total Pages : 485 pages
Book Rating : 4.4/5 (832 download)
Download or read book Fracture and Fatigue written by Lawrence J. Broutman and published by Elsevier. This book was released on 2016-06-15 with total page 485 pages. Available in PDF, EPUB and Kindle. Book excerpt: Composite Materials, Volume 5: Fracture and Fatigue covers the concepts, theories, and experiments on fracture and fatigue behavior of composite materials. The book discusses the fracture of particulate composites, including metal, polymer, and ceramic matrices; relates micromechanics effects to composite strength; and summarizes the various theories relating constituent properties and microstructure to fracture. The text also describes differing theories regarding the strength and fracture of composites; and the theory and experiment relating to time-dependent fracture covering both long-term as well as dynamic fracture. The fatigue of both polymer- and metal-matrix composites and the factors influencing the toughness of both brittle and ductile matrix composites are also considered. Design engineers, materials scientist, materials engineers, and metallurgists will find the book useful.
Author : Diana M. Gomez Rodriguez
Publisher :
ISBN 13 :
Total Pages : 118 pages
Book Rating : 4.:/5 (18 download)
Download or read book Experimental Fracture Toughness of a Lightly Bonded Interface written by Diana M. Gomez Rodriguez and published by . This book was released on 2017 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: The geomechanical behaviour of natural fractured media (NFM) is governed by existing planes of weakness. These planes of weakness can be open fractures, partially closed joints, or cemented veins, and they are classified in groups, joint sets, based on the similarities among them. Some joint sets exhibit cohesion due to infill material emplaced along the walls of the fractures. The geometry of the joint sets in combination with the rigidity of the intact rock allows for shear events to occur when the rock mass is stimulated by hydraulic fracturing. A methodology is produced to create an analogue cohesive fracture within a transparent rock analogue, polymethylmethacrylate (PMMA), and an experimental technique to measure the cohesion or fracture toughness is developed in this study. The methodology is produced to create the cohesive interface is applied by creating cohesive cube specimens to study the interaction the interaction between the hydraulic fracture and the fracture media. The cohesive interface was achieved using the thermal bonding properties of PMMA where two blocks of the material were fused together at 149°C (300°F) under different applied stresses - 6, 12, and 24kPa - and different time intervals - 6, 12, 24, and 48 hours. The specimens were rectangular plates with a circular hole at their center and along the interface. This hole serves as fracture initiation point when subjected to uniaxial load perpendicular to the interface during the fracture toughness test. This test created a controlled fracture where the fracture length increases proportionally to the load increment. Measurements for the fracture length were taken at different load input levels. This information, along with the specimen geometry, and the load and displacement record, served to calculate the fracture toughness of each specimen using Griffith's principles. The ultimate load approach and the mid-point approach were used to analyze the results from this test. The ultimate load approach provided lower coefficient of variability in the scenarios of thick 25mm specimens than for the thin ones; while the mid-point approach provided lower coefficient of variability for the thin 12mm specimens than the ultimate load approach. This is because the mid-point approach truncates the results to minimize the buckling effect. The thick time variable specimens resulted in low coefficient of variability using both approaches. The time variable testing was stopped at a maximum load close to that corresponding to the midpoint approach. Validation of the compressive test was completed by using the standard Compact Tension (CT) procedure where one of the time variable scenarios was tested. This served to prove that the methodology for creating the annealed surface is reliable and it delivers a weakly bonded interface. Nevertheless, more CT testing is recommended to form a relationship between the uniaxial compression test and the standard CT methodology. Furthermore, an experimental procedure is explained for the hydraulic fracturing emulation using a cohesive cube within a costume made set up.
Author :
Publisher :
ISBN 13 :
Total Pages : 75 pages
Book Rating : 4.:/5 (257 download)
Download or read book Tiedonhallinta ja -siirto tietokirjaympäristössä written by and published by . This book was released on 1989 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Amir H. Mohammadipour
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (12 download)
Download or read book Interface Fracture in Masonry Composites written by Amir H. Mohammadipour and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The brick-mortar bond or interface is often the weakest link in the masonry composites. The localization of fracture processes at this bi-material interface plays an important role in the failure of this assemblage. These micro-level fracture processes control the nonlinear behavior of the brick-mortar interface which significantly affects the global behavior of the masonry structure at the continuum macro level. 2D Lattice-based micro-level fracture simulations which are based on Voronoi tessellation to discretize the continuum brick and mortar domains are applied to study progressive debonding of brick-mortar interfaces in unreinforced masonry composites. An energy method is subsequently employed to obtain the energy release rate of the lattice mesh as the crack propagates which is determined by considering the variation in the global stiffness matrix of the mesh with respect to crack length change. This energy release rate is inserted into the Irwin type fracture relationship for plane strain to calculate the modulus of complex stress intensity factor and its mode 1 and mode 2 values which are independent of the distance from the crack tip in the lattice. The lattice results for the energy release rate and stress intensity factors are then validated by comparing with three classic fracture mechanics problems analytical solutions of which are available in the literature. Afterwards, the 2-D plane strain lattice formulation is applied to simulate interfacial fracture properties of conventional test configurations in masonry. The computational lattice model is capable of evaluating the fracture toughness of brick-mortar interface along with other fracture properties from basic strength properties of lattice struts, which are removed by erosion upon failure. This information is employed to upscale the lattice fracture arguments onto the meso-level to quantify the fracture energy formulation of traction-separation cohesive zone models in the context of continuum finite element simulations of heterogeneous media such as masonry. The fracture energy from the lattice is also used in homogenizing a heterogeneous anisotropic masonry unit cell under direct tension using energy equivalence concept to obtain a scalar damage parameter which could be utilized to model the nonlinear behavior of a homogenized isotropic continuum finite element.
Author : Jang-Kyo Kim
Publisher : Elsevier
ISBN 13 : 0080530974
Total Pages : 416 pages
Book Rating : 4.0/5 (85 download)
Download or read book Engineered Interfaces in Fiber Reinforced Composites written by Jang-Kyo Kim and published by Elsevier. This book was released on 1998-10-21 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study and application of composite materials are a truly interdisciplinary endeavour that has been enriched by contributions from chemistry, physics, materials science, mechanics and manufacturing engineering. The understanding of the interface (or interphase) in composites is the central point of this interdisciplinary effort. From the early development of composite materials of various nature, the optimization of the interface has been of major importance. While there are many reference books available on composite materials, few of them deal specifically with the science and mechanics of the interface of fiber reinforced composites. Further, many recent advances devoted solely to research in composite interfaces have been scattered in a variety of published literature and have yet to be assembled in a readily accessible form. To this end this book is an attempt to bring together recent developments in the field, both from the materials science and mechanics perspective, in a single convenient volume.The central theme of the book is tailoring the interface properties to optimise the mechanical peformance and structural integrity of composites with enhanced strength/stiffness and fracture toughness (or specific fracture resistance). It deals mainly with interfaces in advanced composites made from high performance fibers, such as glass, carbon, aramid, ultra high modulus polyethylene and some inorganic (e.g. B/W, A12O3, SiC) fibers, and matrix materials encompassing polymers, metals/alloys and ceramics. The book is intended to provide a comprehensive treatment of composite interfaces in such a way that it should be of interest to materials scientists, technologists and practising engineers, as well as graduate students and their supervisors in advanced composites. We hope that this book will also serve as a valuable source of reference to all those involved in the design and research of composite interfaces.The book contains eight chapters of discussions on microstructure-property relationships with underlying fundamental mechanics principles. In Chapter 1, an introduction is given to the nature and definition of interfaces in fiber reinforced composites. Chapter 2 is devoted to the mechanisms of adhesion which are specific to each fiber-matrix system, and the physio-chemical characterization of the interface with regard to the origin of adhesion. The experimental techniques that have been developed to assess the fiber-matrix interface bond quality on a microscopic scale are presented in Chapter 3, along with the techniques of measuring interlaminar/intralaminar strengths and fracture toughness using bulk composite laminates. The applicability and limitations associated with loading geometry and interpretation of test data are compared. Chapter 4 presents comprehensive theoretical analyses based on shear-lag models of the single fiber composite tests, with particular interest being placed on the interface debond process and the nature of the fiber-matrix interfacial bonding. Chapter 5 is devoted to reviewing current techniques of fiber surface treatments which have been devised to improve the bond strength and the fiber-matrix compatibility/stability during the manufacturing processes of composites. The micro-failure mechanisms and their associated theories of fracture toughness of composites are discussed in Chapter 6. The roles of the interface and its effects on the mechanical performance of fiber composites are addressed from several viewpoints. Recent research efforts to augment the transverse and interlaminar fracture toughness by means of controlled interfaces are presented in Chapters 7 and 8.
Author :
Publisher :
ISBN 13 :
Total Pages : 135 pages
Book Rating : 4.:/5 (227 download)
Download or read book Metal/Ceramic Interfaces: Relationships Between Structures, Chemistry and Interfaces written by and published by . This book was released on 1991 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interface fracture resistance measurements have been conducted on metal/ceramic interfaces with and without reaction products. Both ductile and brittle interface fracture have been documented. Some effects of residual stress have also been investigated. The influence of thermal expansion misfit on the mechanical behavior of metal/ceramic bonded systems has been shown to be strongly governed by the sign of the misfit strain, its magnitude, the yield strength of the metal and to be subject to substantial geometric effects. In some cases, the misfit causes interface failure, while in other, cracking occurs in the ceramic. Generally, misfit has detrimental effects on bond strength, but in special cases, the bond strength can actually be improved. Reaction products exhibit a wide variety of fracture behaviors. In some cases, the reaction products are brittle and subject to residual stress, leading to low fracture energy interfaces governed by the fracture resistance of the reaction product. In other cases ductile reaction products occur, resulting in good bond properties and fracture energies that increase as the reaction product layer thickness increases. Stress corrosion has been found to occur at oxide/metal interfaces, leading to substantial reductions in the fracture resistance. The phenomenon is governed by water vapor and is similar to, but more pronounced than, that found in oxides.
