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Nonlinear Xfem Modeling Of Delamination In Fiber Reinforced Composites Considering Uncertain Fracture Properties And Effect Of Fiber Bridging
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Book Synopsis Nonlinear XFEM Modeling of Delamination in Fiber Reinforced Composites Considering Uncertain Fracture Properties and Effect of Fiber Bridging by : Damoon Motamedi
Download or read book Nonlinear XFEM Modeling of Delamination in Fiber Reinforced Composites Considering Uncertain Fracture Properties and Effect of Fiber Bridging written by Damoon Motamedi and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mode II Delamination Fracture Characterization of Fiber Reinforced Composite Materials by : Carlos Roberto Corleto Mena
Download or read book Mode II Delamination Fracture Characterization of Fiber Reinforced Composite Materials written by Carlos Roberto Corleto Mena and published by . This book was released on 1990 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nonupdating Methods for the Characterization of Nonlinear Stress-strain and Delamination Fracture Properties of Fiber Reinforced Composites by : Bastiaan Corstiaan Wouter van der Vossen
Download or read book Nonupdating Methods for the Characterization of Nonlinear Stress-strain and Delamination Fracture Properties of Fiber Reinforced Composites written by Bastiaan Corstiaan Wouter van der Vossen and published by . This book was released on 2021 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt: Efforts to develop strength and life prediction analysis tools for aircraft composite structures have shown a great need to understand the complexity and interaction of failure modes. Many failure models are highly sensitive to transverse nonlinear shear stress-strain and delamination fracture properties, which are notoriously hard to measure. Without proper input parameters, life predictions analyses will not be successful. The objective of this work was to accurately characterize these mechanical properties of carbon fiber reinforced polymer composites through advanced experimental methods. Full-field noncontact deformation measurements using Digital Image Correlation are used to quantify all surface strains components, enabling the design of experiments subject to complex loading. The presented splined-based optimization techniques link measured strains to applied loading, converging to accurate material properties without ad hoc assumptions on the material model. These methods improve on first-order closed-form and iterative numerical solutions due to flexibility and accuracy without the computational expense. Applications of the optimization model on the Short Beam Shear and Thick Adherend shear tests proved the usefulness of these methods. Full three-dimensional characterization of selected carbon fiber-reinforced polymer composites is presented with a discussion of the applicability of simplifying assumptions on the material model. This experimental program showed that the assumption of transverse anisotropy must be verified, as it may be inaccurate depending on the material. Furthermore, large shear strain response of IM7/8552 UD specimens has been measured by asymmetric three-point bending test. Applicability of the common D3518 ±45 degree off-axis tensile test was also deliberated. Shear stress-strain response measured from D3518 specimens disagrees with the Short Beam Shear and Small Plate Twist test results after about 5000 microstrain. This conclusion was shown to be influenced by the specimens' stacking sequence and microdamage which develops well before damage can be spotted in X-ray Computed Tomography reconstructions. High-magnification deformation measurements are applied to directly measure cohesive laws in precracked Double Cantilever Beam and Thick Adherend shear specimens. Supported by non-destructive in situ crack front measurements by Computed Tomography, the loaded crack tip displacements are directly related to the J-integral. The derived traction-separation law is verified by the excellent agreement of the global response between cohesive model Finite Element Analysis and measurements. This study was the first application of the direct measurement of mode II traction-separation law in Thick Adherend shear specimens.
Book Synopsis Modeling of the Impact Response of Fibre-Reinforced Composites by : Eng Sci Dept/U
Download or read book Modeling of the Impact Response of Fibre-Reinforced Composites written by Eng Sci Dept/U and published by CRC Press. This book was released on 1991-01-01 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarises the development of experimental techniques for determining the impact mechanical properties of fibre reinforced epoxy laminates, and the experimental results obtained for the tensile, compressive and interlaminar shear properties of various epoxy laminates.
Book Synopsis Modeling of the Impact Response of Fibre-Reinforced Composites by : Eng Sci Dept/U
Download or read book Modeling of the Impact Response of Fibre-Reinforced Composites written by Eng Sci Dept/U and published by CRC Press. This book was released on 2020-08-18 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarises the development of experimental techniques for determining the impact mechanical properties of fibre reinforced epoxy laminates, and the experimental results obtained for the tensile, compressive and interlaminar shear properties of various epoxy laminates.
Book Synopsis Fracture Mechanics Approach to Fatigue Life of Discontinuous Fiber Reinforced Composites by : Takashi Matsumoto
Download or read book Fracture Mechanics Approach to Fatigue Life of Discontinuous Fiber Reinforced Composites written by Takashi Matsumoto and published by . This book was released on 1998 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stochastic Optimization of Fiber Reinforced Composites Considering Uncertainties by : Hamid Ghasemi Meyghani
Download or read book Stochastic Optimization of Fiber Reinforced Composites Considering Uncertainties written by Hamid Ghasemi Meyghani and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Briefly, the two basic questions that this research is supposed to answer are: 1. Howmuch fiber is needed and how fibers should be distributed through a fiber reinforced composite (FRC) structure in order to obtain the optimal and reliable structural response? 2. How do uncertainties influence the optimization results and reliability of the structure? Giving answer to the above questions a double stage sequential optimization algorithm for finding the optimal content of short fiber reinforcements and their distribution in the composite structure, considering uncertain design parameters, is presented. In the first stage, the optimal amount of short fibers in a FRC structure with uniformly distributed fibers is conducted in the framework of a Reliability Based Design Optimization (RBDO) problem. Presented model considers material, structural and modeling uncertainties. In the second stage, the fiber distribution optimization (with the aim to further increase in structural reliability) is performed by defining a fiber distribution function through a Non-Uniform Rational BSpline (NURBS) surface. The advantages of using the NURBS surface as a fiber distribution function include: using the same data set for the optimization and analysis; high convergence rate due to the smoothness of the NURBS; mesh independency of the optimal layout; no need for any post processing technique and its non-heuristic nature. The output of stage 1 (the optimal fiber content for homogeneously distributed fibers) is considered as the input of stage 2. The output of stage 2 is the Reliability Index (b) of the structure with the optimal fiber content and distribution. First order reliability method (in order to approximate the limit state function) as well as different material models including Rule of Mixtures, Mori-Tanaka, energy-based approach and stochastic multi-scales are implemented in different examples. The proposed combined model is able to capture the role of available uncertainties in FRC structures through a computationally efficient algorithm using all sequential, NURBS and sensitivity based techniques. The methodology is successfully implemented for interfacial shear stress optimization in sandwich beams and also for optimization of the internal cooling channels in a ceramic matrix composite. Finally, after some changes and modifications by combining Isogeometric Analysis, level set and point wise density mapping techniques, the computational framework is extended for topology optimization of piezoelectric / flexoelectric materials.
Book Synopsis Fiber Reinforced Cement Composites by : Fadhel Aouadi
Download or read book Fiber Reinforced Cement Composites written by Fadhel Aouadi and published by . This book was released on 1992 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mechanical Modeling of Short Fiber Reinforced Composites Using the Extended Finite Element Method by : Matthew G. Pike
Download or read book Mechanical Modeling of Short Fiber Reinforced Composites Using the Extended Finite Element Method written by Matthew G. Pike and published by . This book was released on 2015 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Mechanism Based Modeling Approach to Failure in Fiber Reinforced Composites by : Chandra Sekher Yerramalli
Download or read book A Mechanism Based Modeling Approach to Failure in Fiber Reinforced Composites written by Chandra Sekher Yerramalli and published by . This book was released on 2003 with total page 582 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fracture of Thin-ply Composites by : Guillaume Frossard
Download or read book Fracture of Thin-ply Composites written by Guillaume Frossard and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Mots-clés de l'auteur: Carbon fiber reinforced polymers ; Thin-ply composite ; Interlaminar fracture (delamination) ; Intralaminar fracture ; Translaminar fracture ; Fiber bridging ; Fiber pull-out ; FE modeling ; Cohesive elements.
Book Synopsis The Mechanics of Delamination in Fiber-reinforced Composite Materials. Part II by : S. S. Wang
Download or read book The Mechanics of Delamination in Fiber-reinforced Composite Materials. Part II written by S. S. Wang and published by . This book was released on 1983 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fracture Toughness of Fiber Reinforced Concrete by : M. Wecharatana
Download or read book Fracture Toughness of Fiber Reinforced Concrete written by M. Wecharatana and published by . This book was released on 1983 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: For fiber reinforced cement based composites, the principal beneficial effects of fibers (metallic, mineral or organic) accure after the matrix has cracked. For loads beyond which the matrix has initially cracked, the further crack extension and opening is resisted by bridging of fibers across the cracks. The resistance provided by the fibers will depend prinicipally on the debonding and the pull-out resistance of fibers. A theoretical model based on the concepts of nonlinear fracture mechanics to predict the resistance provided by the fibers against the fracture of matrix is presented in this report. The theoretically predicted response is compared favorably with the experimental data on notched beams and double cantilever beam specimens of steel fiber reinforced concrete. The proposed theoretical model provides a method to calculate fracture resistance for a crack extension in a specimen of any geometry. One of the key parameters required for the model is the relationship between the uniaxial post-cracking stress and the corresponding displacement. This relationship will depend on the bond-slip function of fibers. A method to estimate this relationship is presented.
Book Synopsis Engineered Interfaces in Fiber Reinforced Composites by : Jang-Kyo Kim
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.
Book Synopsis Delamination in Hybrid Carbon/glass Fiber Composites by : Hassan Ali Alessa
Download or read book Delamination in Hybrid Carbon/glass Fiber Composites written by Hassan Ali Alessa and published by . This book was released on 2014 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fiber reinforced composite materials have been used increasingly in primary and secondary structures in such applications as aircraft, satellites, automobiles, biomedical industries, marine, and sporting goods. This growth is due primarily to the characteristics of composite materials, which include high specific stiffness, high specific strength, and low density. Both carbon and glass fibers are often used as reinforcing fibers, embedded in polymer matrix material. The glass fibers are inexpensive, have high strength to weight ratio, but low stiffness. Carbon fiber is more expensive, but have a high strength to weight ratio and high stiffness.The delamination between composite layers is one of primary weaknesses in composite material structure. The mode I peeling, mode II shearing, and mixed-mode I/II are the most common delamination fracture crack driving modes between interfaces. Delamination can then lead to a reduction in the structural stiffness. If the structure has compression loading, buckling failure may ensue. The best design approach may find a compromise between less weight and less cost by using a hybrid material approach of both glass and carbon fibers.This research focused on a hybrid materials consisting of both glass and carbon fiber embedded in a polymer matrix, undergoing mode I, mode II, and mix mode I/II static interlaminar fracture. Glass fiber panels, carbon fiber panels, and hybrid panels were fabricated using the wet layup / vacuum bag technique. The non-hybrid all-glass, all-carbon, and hybrid glass/carbon were experimentally characterized by quasi-static testing in load frames. The specimen and material geometries (especially at material interfaces) were analyzed using the finite element method. The program Abaqus was utilized, including the cohesive zone method (CZM). Finally, the resulting fracture surfaces were investigated using a scanning electron microscope.The result showed the fracture toughness values of hybrid material (FG/CF) were between that of fiber glass and carbon fiber. Also, fracture toughness increased due to fiber bridging under static mode I, mode II, and mixed mode I/II . Fractographic imaging aided to study mechanical properties interface of hybrid (FG/CF) and comber with non-hybrid material of fiber glass and carbon fiber to investigate the differences between hybrid and non-hybrid.
Book Synopsis Modeling Crack Extension in Chopped-Fiber Composites by : FW. Cooke
Download or read book Modeling Crack Extension in Chopped-Fiber Composites written by FW. Cooke and published by . This book was released on 1997 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: A finite element model for predicting the effect of fiber bridging, fiber properties, and fiber-matrix interface strength on the crack-tip stresses and crack propagation potential of a chopped-fiber composite is proposed. The method of virtual crack extension was used to model crack growth in a micromechanics composite material model. The purpose of this study was to investigate the effects of fiber bridging of a crack and fiber-matrix interface strength on the stress intensity and strain energy release rate in virtual crack extension.
Book Synopsis Modeling Structural Behavior of Fiber Reinforced Composite Parts by Considering Draping Effects by : Siegfried Galkin
Download or read book Modeling Structural Behavior of Fiber Reinforced Composite Parts by Considering Draping Effects written by Siegfried Galkin and published by . This book was released on 2022* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
