Download or read book Probabilistic Evaluation of Structures Using Finite Element Method written by Xiu-li Guan and published by . This book was released on 1992 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis the probabilistic evaluation of structures is divided in two parts: (i) the calculation of the response statistics and (ii) the determination of structural reliability.

Download or read book Probabilistic Structural Mechanics Handbook written by C.R. Sundararajan and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 756 pages. Available in PDF, EPUB and Kindle. Book excerpt: The need for a comprehensive book on probabilistic structural mechanics that brings together the many analytical and computational methods developed over the years and their applications in a wide spectrum of industries-from residential buildings to nuclear power plants, from bridges to pressure vessels, from steel structures to ceramic structures-became evident from the many discussions the editor had with practising engineers, researchers and professors. Because no single individual has the expertise to write a book with such a di.verse scope, a group of 39 authors from universities, research laboratories, and industries from six countries in three continents was invited to write 30 chapters covering the various aspects of probabilistic structural mechanics. The editor and the authors believe that this handbook will serve as a reference text to practicing engineers, teachers, students and researchers. It may also be used as a textbook for graduate-level courses in probabilistic structural mechanics. The editor wishes to thank the chapter authors for their contributions. This handbook would not have been a reality without their collaboration.

Download or read book Probabilistic Evaluation of Advanced Ceramic Matrix Composite Structures written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-03 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this report is to summarize the deterministic and probabilistic structural evaluation results of two structures made with advanced ceramic composites (CMC): internally pressurized tube and uniformly loaded flange. The deterministic structural evaluation includes stress, displacement, and buckling analyses. It is carried out using the finite element code MHOST, developed for the 3-D inelastic analysis of structures that are made with advanced materials. The probabilistic evaluation is performed using the integrated probabilistic assessment of composite structures computer code IPACS. The affects of uncertainties in primitive variables related to the material, fabrication process, and loadings on the material property and structural response behavior are quantified. The primitive variables considered are: thermo-mechanical properties of fiber and matrix, fiber and void volume ratios, use temperature, and pressure. The probabilistic structural analysis and probabilistic strength results are used by IPACS to perform reliability and risk evaluation of the two structures. The results will show that the sensitivity information obtained for the two composite structures from the computational simulation can be used to alter the design process to meet desired service requirements. In addition to detailed probabilistic analysis of the two structures, the following were performed specifically on the CMC tube: (1) predicted the failure load and the buckling load, (2) performed coupled non-deterministic multi-disciplinary structural analysis, and (3) demonstrated that probabilistic sensitivities can be used to select a reduced set of design variables for optimization.Abumeri, Galib H. and Chamis, Christos C.Glenn Research CenterCERAMIC MATRIX COMPOSITES; STRESS ANALYSIS; STRUCTURAL ANALYSIS; STRUCTURAL FAILURE; FINITE ELEMENT METHOD; BUCKLING; SHEAR; PROBABILITY THEORY

Download or read book Probabilistic Methods in Geotechnical Engineering written by K.S. Li and published by CRC Press. This book was released on 2020-08-19 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proceedings of this conference contain keynote addresses on recent developments in geotechnical reliability and limit state design in geotechnics. It also contains invited lectures on such topics as modelling of soil variability, simulation of random fields and probability of rock joints. Contents: Keynote addresses on recent development on geotechnical reliability and limit state design in geotechnics, and invited lectures on modelling of soil variability, simulation of random field, probabilistic of rock joints, and probabilistic design of foundations and slopes. Other papers on analytical techniques in geotechnical reliability, modelling of soil properties, and probabilistic analysis of slopes, embankments and foundations.

Download or read book Uncertainty Modeling in Finite Element Fatigue and Stability of Systems written by Achintya Haldar and published by World Scientific. This book was released on 1997 with total page 437 pages. Available in PDF, EPUB and Kindle. Book excerpt: The functionality of modern structural, mechanical and electrical or electronic systems depends on their ability to perform under uncertain conditions. Consideration of uncertainties and their effect on system behavior is an essential and integral part of defining systems. In eleven chapters, leading experts present an overview of the current state of uncertainty modeling, analysis and design of large systems in four major areas: finite and boundary element methods (common structural analysis techniques), fatigue, stability analysis, and fault-tolerant systems. The content of this book is unique; it describes exciting research developments and challenges in emerging areas, and provide a sophisticated toolbox for tackling uncertainty modeling in real systems.

Download or read book Probabilistic Evaluation of Uncertainties and Risks in Aerospace Components written by A. R. Shah and published by . This book was released on 1992 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Probabilistic Finite Element Analysis written by and published by . This book was released on 1992 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: The finite element method has been used extensively in structural analyses. Traditionally, the properties of the systems which have been modeled using finite elements have been assumed to be deterministic. The uncertainties in the structural response behavior estimates which result from uncertainties in the properties of the system have been accounted for in design using safety and reduction factors. As structures become more complex and industry makes use of materials such as composites, which are known to have random material properties, an alternative approach to design which quantifies the distributions in response may be required. Probabilistic finite element techniques, which are capable of assessing the distributions in response behavior for systems with random material properties, loads and boundary conditions are presented in this thesis. One particular method termed second-moment analysis is examined in detail. This method includes perturbation techniques and is used to compute the expected values and covariance matrices of probabilistic response behavior. Second-moment analyses in conjunction with the finite element method require as input the expected values of the random processes inherent to the system and their covariance matrices. Methods are also presented to compute these parameters for local element averages of the random processes which describe the uncertainty in the system. Implements probabilistic finite element techniques as developed in the study to predict the probabilistic response behavior of marine riser systems in which, certain aspects of the problem are considered probabilistic.

Download or read book NASA Technical Memorandum written by and published by . This book was released on 1994 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Probabilistic Risk Assessment written by and published by . This book was released on 2000 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contains references to documents in the NASA Scientific and Technical (STI) Database.

Download or read book Reliability Assessment Using Stochastic Finite Element Analysis written by Achintya Haldar and published by John Wiley & Sons. This book was released on 2000-05-22 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first complete guide to using the Stochastic Finite Element Method for reliability assessment Unlike other analytical reliability estimation techniques, the Stochastic Finite Element Method (SFEM) can be used for both implicit and explicit performance functions, making it a particularly powerful and robust tool for today's engineer. This book, written by two pioneers in SFEM-based methodologies, shows how to use SFEM for the reliability analysis of a wide range of structures. It begins by reviewing essential risk concepts, currently available risk evaluation procedures, and the use of analytical and sampling methods in estimating risk. Next, it introduces SFEM evaluation procedures, with detailed coverage of displacement-based and stress-based deterministic finite element approaches. Linear, nonlinear, static, and dynamic problems are considered separately to demonstrate the robustness of the methods. The risk or reliability estimation procedure for each case is presented in different chapters, with theory complemented by a useful series of examples. Integrating advanced concepts in risk-based design, finite elements, and mechanics, Reliability Assessment Using Stochastic Finite Element Analysis is vital reading for engineering professionals and students in all areas of the field.

Download or read book Probabilistic Evaluation of Fuselage type Composite Structures written by Michael C. Shiao and published by . This book was released on 1991 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Probabilistic Finite Element Analysis of Structures Using the Multiplicative Dimensional Reduction Method written by Georgios Balomenos and published by . This book was released on 2015 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is widely accepted that uncertainty may be present for many engineering problems, such as in input variables (loading, material properties, etc.), in response variables (displacements, stresses, etc.) and in the relationships between them. Reliability analysis is capable of dealing with all these uncertainties providing the engineers with accurate predictions of the probability of a structure performing adequately during its lifetime. In probabilistic finite element analysis (FEA), approximate methods such as Taylor series methods are used in order to compute the mean and the variance of the response, while the distribution of the response is usually approximated based on the Monte Carlo simulation (MCS) method. This study advances probabilistic FEA by combining it with the multiplicative form of dimensional reduction method (M-DRM). This combination allows fairly accurate estimations of both the statistical moments and the probability distribution of the response of interest. The response probability distribution is obtained using the fractional moments, which are calculated from M-DRM, together with the maximum entropy (MaxEnt) principle. In addition, the global variance-based sensitivity coefficients are also obtained as a by-product of the previous analysis. Therefore, no extra analytical work is required for sensitivity analysis. The proposed approach is integrated with the OpenSees FEA software using Tcl programing and with the ABAQUS FEA software using Python programing. OpenSees is used to analyze structures under seismic loading, where both pushover analysis and dynamic analysis is performed. ABAQUS is used to analyze structures under static loading, where the concrete damage plasticity model is used for the modeling of concrete. Thus, the efficient applicability of the proposed method is illustrated and its numerical accuracy is examined, through several examples of nonlinear FEA of structures. This research shows that the proposed method, which is based on a small number of finite element analyses, is robust, computational effective and easily applicable, providing a feasible alternative for finite element reliability and sensitivity analysis of practical and real life problems. The results of such work have significance in future studies for the estimation of the probability of the response exceeding a safety limit and for establishing safety factors related to acceptable probabilities of structural failures.

Download or read book SAMPE Symposium and Exhibition written by Linas Repecka and published by Taylor & Francis. This book was released on 2001 with total page 2637 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Variational Approach to Probabilistic Finite Elements written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-23 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: Probabilistic finite element methods (PFEM), synthesizing the power of finite element methods with second-moment techniques, are formulated for various classes of problems in structural and solid mechanics. Time-invariant random materials, geometric properties and loads are incorporated in terms of their fundamental statistics viz. second-moments. Analogous to the discretization of the displacement field in finite element methods, the random fields are also discretized. Preserving the conceptual simplicity, the response moments are calculated with minimal computations. By incorporating certain computational techniques, these methods are shown to be capable of handling large systems with many sources of uncertainties. By construction, these methods are applicable when the scale of randomness is not very large and when the probabilistic density functions have decaying tails. The accuracy and efficiency of these methods, along with their limitations, are demonstrated by various applications. Results obtained are compared with those of Monte Carlo simulation and it is shown that good accuracy can be obtained for both linear and nonlinear problems. The methods are amenable to implementation in deterministic FEM based computer codes. Belytschko, T. and Liu, W. K. and Mani, A. and Besterfield, G. Unspecified Center DYNAMIC STRUCTURAL ANALYSIS; ELASTOPLASTICITY; FINITE ELEMENT METHOD; SOLID MECHANICS; VARIATIONAL PRINCIPLES; DISPLACEMENT; LOADS (FORCES); MONTE CARLO METHOD; NONLINEARITY; PROBABILITY THEORY...

Download or read book Probabilities and Materials written by D. Breysse and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: Most industrial and natural materials exhibit a macroscopic behaviour which results from the existence of microscale inhomogeneities. The influence of such inhomogeneities is commonly modelled using probabilistic methods. Most of the approaches to the evaluation of the safety of structures according to probabilistic criteria are somewhat scattered, however, and it is time to present such material in a coherent and up-to-date form. Probabilities and Materials undertakes this task, and also defines the great tasks that must be tackled in coming years. For engineers and researchers dealing with materials, geotechnics, solid mechanics, soil mechanics, statistics and stochastic processes. The expository nature of the book means that no prior knowledge of statistics or probability is required of the reader. The book can thus serve as an excellent introduction to the nature of applied statistics and stochastic modelling.

Download or read book Probabilistic Structural Analysis Methods Psam for Select Space Propulsion System Components written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-27 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fourth year of technical developments on the Numerical Evaluation of Stochastic Structures Under Stress (NESSUS) system for Probabilistic Structural Analysis Methods is summarized. The effort focused on the continued expansion of the Probabilistic Finite Element Method (PFEM) code, the implementation of the Probabilistic Boundary Element Method (PBEM), and the implementation of the Probabilistic Approximate Methods (PAppM) code. The principal focus for the PFEM code is the addition of a multilevel structural dynamics capability. The strategy includes probabilistic loads, treatment of material, geometry uncertainty, and full probabilistic variables. Enhancements are included for the Fast Probability Integration (FPI) algorithms and the addition of Monte Carlo simulation as an alternate. Work on the expert system and boundary element developments continues. The enhanced capability in the computer codes is validated by applications to a turbine blade and to an oxidizer duct. Unspecified Center NASA-CR-187198, NAS 1.26:187198, SWRI-06-8339 NAS3-24389; RTOP 553-13-00...

Download or read book Guidelines for Probabilistic Performance Based Seismic Design and Assessment of Slope Engineering written by Yu Huang and published by Springer Nature. This book was released on 2023-03-16 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a new design and evaluation framework based on slope Stochastic Dynamics theory to probabilistic seismic performance for slope engineering. For the seismic dynamic stability safety of slope, it shifts from deterministic seismic dynamic analysis to quantitative analysis based on nonlinear stochastic dynamics, that is, from qualitative to the description of stochasticity of earthquake excitation that meet the needs in related design specification and establish a performance standard. In the nonlinear dynamic time history analysis of slope subjected to seismic ground motion, the term “randomness” is used to express the uncertainty in the intensity and frequency of earthquake excitation for slope engineering dynamic seismic performance. It mainly includes seismic design fortification standard, corresponding ground motion excitation, performance index threshold, and slope deterministic nonlinear seismic dynamic response. Even more than that, the seismic dynamic large deformation approaches of the whole process and comprehensive analysis for flow analysis after slope instability failure. Eventually, the probabilistic seismic dynamic performance of the slope engineering will be characterized by nonlinear dynamic reliability.