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Book Reliability and Safety Engineering

Download or read book Reliability and Safety Engineering written by Ajit Kumar Verma and published by Springer. This book was released on 2015-09-28 with total page 583 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reliability and safety are core issues that must be addressed throughout the life cycle of engineering systems. Reliability and Safety Engineering presents an overview of the basic concepts, together with simple and practical illustrations. The authors present reliability terminology in various engineering fields, viz., electronics engineering, software engineering, mechanical engineering, structural engineering and power systems engineering. The book describes the latest applications in the area of probabilistic safety assessment, such as technical specification optimization, risk monitoring and risk informed in-service inspection. Reliability and safety studies must, inevitably, deal with uncertainty, so the book includes uncertainty propagation methods: Monte Carlo simulation, fuzzy arithmetic, Dempster-Shafer theory and probability bounds. Reliability and Safety Engineering also highlights advances in system reliability and safety assessment including dynamic system modeling and uncertainty management. Case studies from typical nuclear power plants as well as from structural, software and electronic systems are also discussed. Reliability and Safety Engineering combines discussions of the existing literature on basic concepts and applications with state-of-the-art methods used in reliability and risk assessment of engineering systems. It is designed to assist practicing engineers, students and researchers in the areas of reliability engineering and risk analysis.

Book Interlaminar Stresses and Fracture Behavior in Thickness tapered Composite Laminates

Download or read book Interlaminar Stresses and Fracture Behavior in Thickness tapered Composite Laminates written by Kan He and published by . This book was released on 2002 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Design and manufacture of a variable thickness composite laminate such as a helicopter yoke involves tapering the laminate by dropping individual plies at discrete internal locations, in order to tailor the stiffness of the laminate. The ply drop in the laminate creates large interlaminar stresses and initiates delamination. Therefore, there is a necessity to investigate the fundamental failure mechanisms and controlling parameters that account for the delamination mode of failure in tapered laminates. In this thesis, a numerical and experimental study on interlaminar stresses and delamination in tapered laminates is presented, including a critical and comprehensive review on earlier works on this type of structure. Numerical analyses performed involved development of partial hybrid stress finite elements needed to enhance computational efficiency, and development of a physical concept-based modified shear-lag model that is based on the essential assumptions that both plies and resin layers are treated as carriers of tensile stress and also to act as stress-transfer media. Experimental analysis was attempted to assess the accuracy of the numerical predictions. For this purpose, tapered NCT-301 Graphite/Epoxy specimens were manufactured using a ply in-fill technique for the cured consolidation and tested under quasi-static uniaxial tension. To perform strength and delamination analyses of the tapered laminate, the laminate was modeled as a generalized plane deformation problem, where all the variables involved in the model are independent of the coordinate system. Also quasi-three dimensional partial hybrid finite elements were used to quantify the analysis. In addition to the plies, the inter-ply resin at the critical ply interface was also modeled in order to have direct and realistic interlaminar responses. Stress-based criteria that have proved to be effective in determination of critical location and load of delamination onset were utilized in this study to predict the delamination strength of the laminate. A good correlation between the predictions and experimental results were observed. Evaluation of strain energy release rates of delaminations occurring at the critical interfaces of the tapered laminate was carried out by using the J -integral approach. This was possible because of the path-independence of the J -integral that results in avoiding the need for analyzing the singular stress field near the delamination tip and reducing the computing effort required. Effects of various design parameters on the structural performance of the tapered laminate were studied so as to gain an insight into design considerations for tapered composite structures.

Book Interlaminar Response of Composite Materials

Download or read book Interlaminar Response of Composite Materials written by N.J. Pagano and published by Elsevier. This book was released on 2012-12-02 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the topics of major importance toward understanding the most feared failure mode in composite laminates, namely delamination. There are few books at present that describe the phenomenon of composite laminate failure by delamination in such detail.Written by pioneers and principal researchers in various aspects of composite delamination, starting from basic principles to the most current research findings, the work provides a complete study of the theoretical and experimental aspects of composite delamination in one volume.

Book The Virtual Crack Closure Technique History Approach and Applications

Download or read book The Virtual Crack Closure Technique History Approach and Applications written by Ronald Krueger and published by . This book was released on 2002 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: An overview of the virtual crack closure technique is presented. The approach used is discussed, the history summarized, and insight into its applications provided. Equations for two-dimensional quadrilateral elements with linear and quadratic shape functions are given. Formula for applying the technique in conjuction with three-dimensional solid elements as well as plate/shell elements are also provided. Necessary modifications for the use of the method with geometrically nonlinear finite element analysis and corrections required for elements at the crack tip with different lengths and widths are discussed. The problems associated with cracks or delaminations propagating between different materials are mentioned briefly, as well as a strategy to minimize these problems. Due to an increased interest in using a fracture mechanics based approach to assess the damage tolerance of composite structures in the design phase and during certification, the engineering problems selected as examples and given as references focus on the application of the technique to components made of composite materials.

Book Delamination and Debonding of Materials

Download or read book Delamination and Debonding of Materials written by W. Steven Johnson and published by ASTM International. This book was released on 1985 with total page 507 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Interlaminar Stresses at Straight Free Edges of Composite Laminates

Download or read book Interlaminar Stresses at Straight Free Edges of Composite Laminates written by Christos Kassapoglou and published by . This book was released on 1984 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt: A simple approximate method to predict interlaminar stresses at straight free edges of symmetric composite laminates under uniaxial loads has been developed based on overall force and moment equilibrium and on the principle of minimum complementary potential energy. Results using the present method compare well with other analytical methods. The present method is considerably more efficient, especially in its ability to easily analyze thick laminates, and could be implemented on a personal computer. The solution for the special cases of angle-plied and cross-plied laminates is also obtained (in closed form) and is simpler than for general laminates. This solution for certain cross-plied laminates coincides with a previous solution derived from a special version of plate theory. Using the analysis, the sensitivity of the solution to various parameters such as different elastic constants and different ways of determining the longitudinal in-plane normal stress is examined. In addition, the solution shows that the thin resin layer which exists between plies does not affect the interlaminar stresses calculated from the orthotropic and homogeneous assumption for individual plies. The boundary layer where the interlaminar stresses are significant is defined and discussed and the concept of the "effective ply thickness" introduced. Finally, an experimental technique to measure in-plane displacement at the top surface of the laminate inside the boundary layer was developed. The experimental results are in good agreement with the predictions from theory.

Book Investigation of Interlaminar Stresses in Laminated Composites Using the Resin layer Concept and Cubic Zig zag Plate Theory

Download or read book Investigation of Interlaminar Stresses in Laminated Composites Using the Resin layer Concept and Cubic Zig zag Plate Theory written by Venugopal Amineni and published by . This book was released on 1997 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Combined Effect of Matrix Cracking and Stress free Edge on Delamination

Download or read book Combined Effect of Matrix Cracking and Stress free Edge on Delamination written by Satish Annaji Salpekar and published by DIANE Publishing. This book was released on 1990 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Mixed mode Strain energy release Rate Effects on Edge Delamination of Composites

Download or read book Mixed mode Strain energy release Rate Effects on Edge Delamination of Composites written by Kevin T. O'Brien and published by . This book was released on 1983 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: