Determination of Fracture Parameters and Stress Fields of Orthotropic Functionally Graded Materials Using Finite Element Analysis PDF Download

Author: Arun P. Kaile
Publisher:
ISBN:
Category :
Languages : en
Pages : 336

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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Book Description
Functionally graded materials processed by the thermal spray techniques such as electron beam physical vapor deposition and plasma spray forming are known to have an orthotropic structure with reduced mechanical properties. Debonding related failures in these types of material systems occur due to embedded cracks that are perpendicular to the direction of the material property gradation. These cracks are inherently under mixed-mode loading and fracture analysis requires the extraction of the modes I and II stress intensity factors. The present study aims at developing semi-analytical techniques to study embedded crack problems in graded orthotropic media under various boundary conditions. The cracks are assumed to be aligned parallel to one of the principal axes of orthotropy. The problems are formulated using the averaged constants of plane orthotropic elasticity and reduced to two coupled integral equations with Cauchy type dominant singularities. The equations are solved numerically by adopting an expansion - collocation technique. The main results of the analyses are the mixed mode stress intensity factors and the energy release rate as functions of the material nonhomogeneity and orthotropy parameters. The effects of the boundary conditions on the mentioned fracture parameters are also duly discussed.

Author: Soheil Mohammadi
Publisher: John Wiley & Sons
ISBN: 1118443381
Category : Science
Languages : en
Pages : 1

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This book describes the basics and developments of the new XFEM approach to fracture analysis of composite structures and materials. It provides state of the art techniques and algorithms for fracture analysis of structures including numeric examples at the end of each chapter as well as an accompanying website which will include MATLAB resources, executables, data files, and simulation procedures of XFEM. The first reference text for the extended finite element method (XFEM) for fracture analysis of structures and materials Includes theory and applications, with worked numerical problems and solutions, and MATLAB examples on an accompanying website with further XFEM resources Provides a comprehensive overview of this new area of research, including a review of Fracture Mechanics, basic through to advanced XFEM theory, as well as current problems and applications Includes a chapter on the future developments in the field, new research areas and possible future applications of the method

Author: Hongwei Li
Publisher:
ISBN:
Category : Functionally gradient materials
Languages : en
Pages : 138

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Author: Kangyu He
Publisher:
ISBN:
Category :
Languages : en
Pages : 216

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Author: Ray Douglas Carpenter
Publisher:
ISBN: 9781303151064
Category :
Languages : en
Pages :

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The primary objective of this research was to extend established fracture toughnesstesting methods to a new class of engineering materials known as functionally gradedmaterials (FGMs). Secondary goals were to compare experimental results to thosepredicted by finite element models and to provide fracture test results as feedback towardoptimizing processing parameters for the in-house synthesis of a MoSi2/SiC FGM.Preliminary experiments were performed on commercially pure (CP) Ti and uniformaxial tensile tests resulted in mechanical property data including yield strength, 268 MPa,ultimate tensile strength, 470 MPa and Young's modulus, 110 GPa. Results from 3-pointbending fracture experiments on CP Ti demonstrated rising R-curve behavior andexperimentally determined J[Q] fracture toughness values ranged between 153 N/mm and254 N/mm. Similar experimental protocols were used for fracture experiments on a 7-layered Ti/TiB FGM material obtained from Cercom in Vista, California. A noveltechnique for pre-cracking in reverse 4-point bending was developed for thisductile/brittle FGM material. Fracture test results exhibited rising R-curve behavior and estimated J[Q] fracture toughness values ranged from 0.49 N/mm to 2.63 N/mm. A 5-layered MoSi2/SiC FGM was synthesized using spark plasma sintering (SPS). Samples ofthis material were fracture tested and the results again exhibited a rising R-curve with K[IC] fracture toughness values ranging from 2.7 MPa-m1/2 to 6.0 MPa-m1/2. Finite Element Models predicted rising R-curve behavior for both of the FGM materials tested. Modelresults were in close agreement for the brittle MoSi2/SiC FGM. For the relatively moreductile Ti/TiB material, results were in close agreement at short crack lengths butdiverged at longer crack lengths because the models accounted for fracture tougheningmechanisms at the crack tip but not those acting in the crack wake.

Author: Rajeev Agrawal
Publisher: Springer Nature
ISBN: 981163033X
Category : Technology & Engineering
Languages : en
Pages : 514

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This book presents select proceedings of the International Conference on Evolution in Manufacturing (ICEM 2020), and examines a range of areas including internet-of-things for cyber manufacturing, data analytics for manufacturing systems and processes and materials. The topics covered include modeling simulation and decision making in cyber physical systems for supporting engineering and production management, innovative approach in materials development, biomaterial applications, and advancement in manufacturing and material technologies. The book also discusses sustainability in manufacturing and supply chain management including circular economy. The book will be a valuable reference for beginners, researchers, and professionals interested in smart manufacturing in engineering, production management and materials technology.

Author: Haider Khazal
Publisher:
ISBN:
Category : Digital image correlation
Languages : en
Pages : 11

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This research reports the computation of the fracture parameters, namely T-stress and stress intensity factors of a stepwise functionally graded material (FGM) by using the digital image correlation technique. A five-layer epoxy/glass FGM with layers varying from pure epoxy to 60 % glass/40 % epoxy was investigated. The effects of the crack-tip positions and crack length on the nonsingular terms were analyzed. In addition, the numerical simulation of the layered FGM was investigated to further evaluate the fracture parameters. The numerical and experimental model results were compared, and good agreement was obtained between the experimental and numerical tests. Accordingly, the numerical models developed with the corresponding material properties can be used for the evaluation of fracture parameters of the developed FGM.

Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 974

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Author: John P. Wolf
Publisher: John Wiley & Sons
ISBN: 9780471486824
Category : Technology & Engineering
Languages : en
Pages : 398

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Book Description
A novel computational procedure called the scaled boundary finite-element method is described which combines the advantages of the finite-element and boundary-element methods : Of the finite-element method that no fundamental solution is required and thus expanding the scope of application, for instance to anisotropic material without an increase in complexity and that singular integrals are avoided and that symmetry of the results is automatically satisfied. Of the boundary-element method that the spatial dimension is reduced by one as only the boundary is discretized with surface finite elements, reducing the data preparation and computational efforts, that the boundary conditions at infinity are satisfied exactly and that no approximation other than that of the surface finite elements on the boundary is introduced. In addition, the scaled boundary finite-element method presents appealing features of its own : an analytical solution inside the domain is achieved, permitting for instance accurate stress intensity factors to be determined directly and no spatial discretization of certain free and fixed boundaries and interfaces between different materials is required. In addition, the scaled boundary finite-element method combines the advantages of the analytical and numerical approaches. In the directions parallel to the boundary, where the behaviour is, in general, smooth, the weighted-residual approximation of finite elements applies, leading to convergence in the finite-element sense. In the third (radial) direction, the procedure is analytical, permitting e.g. stress-intensity factors to be determined directly based on their definition or the boundary conditions at infinity to be satisfied exactly. In a nutshell, the scaled boundary finite-element method is a semi-analytical fundamental-solution-less boundary-element method based on finite elements. The best of both worlds is achieved in two ways: with respect to the analytical and numerical methods and with respect to the finite-element and boundary-element methods within the numerical procedures. The book serves two goals: Part I is an elementary text, without any prerequisites, a primer, but which using a simple model problem still covers all aspects of the method and Part II presents a detailed derivation of the general case of statics, elastodynamics and diffusion.