XEFGM Fracture Analysis of Functionally Graded Materials Under Mixed Mode and Asymmetric Loading PDF Download

Author: Nathera A. Saleh
Publisher:
ISBN:
Category : Electronic books
Languages : en
Pages : 0

View

Book Description
This research describes crack analysis in the functionally graded materials (FGMs) by adopting the extended element free Galerkin method (XEFGM) under mixed mode and asymmetric loading. These loads are somewhat similar to fatigue loads because, numerically, they are load values from zero and then directly to the critical load. The meshfree method can be easily simulated the fracture problems against the traditional numerical method because it is not dependent on mesh. Triangles technique in the process of numerical integration at regions of discontinuity, functions of enrichment, and as well as the appropriate support field to contain numerical points and nodes to from the shape functions are used in this study. In addition, incompatible interaction integration technique has used to determine the stress intensity factors (SIFs). Two study cases with different crack positions were studied and compared with the experimental works of the relevant reference literature, where accurate and identical results were obtained.

Author: Zak Abdallah
Publisher: BoD – Books on Demand
ISBN: 1839695544
Category : Technology & Engineering
Languages : en
Pages : 120

View

Book Description
Advances in Fatigue and Fracture Testing and Modelling explores various aspects related to fatigue and fracture in metallic and non-metallic materials in terms of mechanical testing and numerical modelling. The book provides results of research work conducted by experts worldwide. It discusses fatigue failure of materials and presents possible numerical solutions. It also presents predictive models and finite element (FE) activities to illustrate the behaviour of materials in real-life conditions.

Author: G.H. Paulino
Publisher: Elsevier
ISBN: 9780080441603
Category : Science
Languages : en
Pages : 306

View

Book Description
Scientific research on functionally graded materials (FGM's) looks at functions of gradients in materials comprising thermodynamic, mechanical, chemical, optical, electromagnetic, and/or biological aspects. This collection of technical papers represents current research interests with regard to the fracture behaviour of FGM's. The papers provide a balance between theoretical, computational, and experimental techniques. It also indicates areas for increased development, such as constraint effects, full experimental characterization of engineering FGM's under static and dynamic loading, development of fracture criteria with predictive capability, multiphysics and multiscale failure considerations, and connection of research with industrial applications.

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

View

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: Vasil Georgiev
Publisher: Springer
ISBN: 331973900X
Category : Medical
Languages : en
Pages : 434

View

Book Description
The genus Salvia represents nearly 1,000 species that are widely distributed around the world. It is the largest in the Lamiaceae family. Traditionally, infusions of Salvia species have been widely used to treat oral inflammation, throat and headaches, and digestive disturbances in various folklore- and ethno-medicine practices worldwide. The antispasmodic, antiseptic and hypoglycemic effects of their extracts have been recognized by the ancient healers a long time ago before the development of modern medicine. With the advances in phytochemistry and pharmacology, terpenes, polyphenols and volatile compounds have been recognized as the source of bioactivity in Salvia extracts. Nowadays, because of their valuable pharmaceutical and nutraceutical properties, many Salvia species have been widely used as ingredients in food, pharmacy and cosmetic industries. The economic importance of Salvia plants continues to increase, following closely the growing interest to the concept for modern healthy lifestyle, based on prevention by consuming quality foods and nutraceutical supplements of natural origin. However, the growing demand has led to overexploitation of natural habitats and in the last few years many wild growing Salvia species have shrunk or fallen under threat. Obviously, to deal with that problem and to prevent ecological crisis, there is an urgent need for alternative, renewable sources of Salvia biomass. Plant biotechnology can provide a wide range of tools for development of economically feasible continuous production of standardized valuable phytochemicals. Plant in vitro culture technology is a powerful method for continuous production of plant secondary metabolites under controlled conditions, recently adapted to various Salvia species. Salvia in vitro systems are harmless to natural plant populations and can be grown independently of environmental factors, geographical latitude, climatic change, and seasonal variations. Several bioactive metabolites from rare and endangered Salvia plants can be produced by employing different plant in vitro systems. However, the researches on development of large scale biotechnology, based on Salvia in vitro systems, are still in early stages and many points still have to be addressed before the commercialization to take place. In this book we intend to summarize the recent achievements in research with Salvia in vitro systems as biological matrixes for the production of pharmaceutically important secondary metabolites. Further we invited leading experts to present their recent studies on phytochemistry, ethnobotanical and ethnophamacological aspects of genus Salvia. Safety and legal issues related to implementation of Salvia plants and in vitro cultures extracts in foods, cosmetics and pharmaceutical products will be discussed as well.

Author: Zak Abdallah
Publisher: BoD – Books on Demand
ISBN: 1839684313
Category : Technology & Engineering
Languages : en
Pages : 167

View

Book Description
This book, Casting Processes and Modelling of Metallic Materials, explores the various casting and modelling activities related to metallic alloy systems. The book provides results of research work conducted by experts from all over the globe to add to the research community in the era of the casting process and modelling. The book was edited by two experts in the field of materials science and modelling, Dr. Abdallah and Dr. Aldoumani, whom both have several publications in peer-reviewed journals, worldwide conferences, and scientific books. The book introduces the casting processes and then discusses the various issues and possible solutions. Over the past years, various models have been proposed and utilized to predict the performance of castings. Some of these models proved to be accurate whereas others failed to predict the casting performance. The strength of any predictive tool depends on the employment of physically meaningful parameters that replicate the real-life conditions. This has been illustrated in the current book with such predictive models and finite element (FE) modelling to illustrate the behaviour of castings in real-life conditions.

Author: Stanislav Grof
Publisher: SUNY Press
ISBN: 9780873958493
Category : Philosophy
Languages : en
Pages : 306

View

Book Description
A critical revaluation of ancient spiritual systems long ignored or rejected because of their assumed incompatibility with science. Here are Swami Muktananda on the mind, Swami Prajnananda on Karma, Swami Kripananda on the Kundalini, Joseph Chilton Pearce on spiritual development, Jack Kornfield on Buddhism for Americans, Claudio Naranjo on meditation, and much more.

Author: Mark Kachanov
Publisher: Springer Science & Business Media
ISBN: 9400757158
Category : Science
Languages : en
Pages : 393

View

Book Description
The book contains state-of the-art reviews in the area of effective properties of heterogeneous materials - the classical field at interface of materials science and solid mechanics. The primary focus is on thermo-mechanical properties, materials science applications, as well as computational aspects and new opportunities provided by rapidly increasing computer powers. The reviews are at the level that is appropriate for a substantial community of researchers working in this field, both at universities and in the industry, and to graduate students. The book can be used as supplementary reading to graduate level courses.