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Journal articles on the topic 'Structural analysis (Engineering) Mechanics, Applied'

Author: Grafiati

Published: 4 June 2021

Last updated: 13 February 2022

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1

Mang, H. A., Ch Hellmich, R. Lackner, and B. Pichler. "Computational structural mechanics." International Journal for Numerical Methods in Engineering 52, no. 56 (October 20, 2001): 569–87. http://dx.doi.org/10.1002/nme.298.

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2

Wiechert, Bernd Udo. "Applied Biomechanics: Prosthetic and Orthopaedics." Proceeding International Conference on Science and Engineering 1 (October 31, 2017): xiii. http://dx.doi.org/10.14421/icse.v1.315.

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Biomechanics is closely related to engineering, because it often uses traditional engineering sciences to analyze biological systems. Some simple applications of Newtonian mechanics and/or materials sciences can supply correct approximations to the mechanics of many biological systems. Applied mechanics, most notably mechanical engineering disciplines such as continuum mechanics, mechanism analysis, structural analysis, kinematics and dynamics play prominent roles in the study of biomechanics. Usually biological systems are much more complex than man-built systems. Numerical methods are hence applied in almost every biomechanical study. Research is done in an iterative process of hypothesis and verification, including several steps of modeling, computer simulation and experimental measurements. Prosthetics and orthotics are clinical disciplines that deal with artificial limbs (prostheses) for people with amputations and supportive devices (orthoses) for people with musculoskeletal weakness or neurological disorders and some disability person. The development of prosthetics and orthotics disciplines is depend on development of science and engineering. The understanding of this multidiscipline field is important the advancement in this field. In this session i will overview the current development in prosthetics and orthotics field, expl ain a brief survey on its method, and discuss perspective for future trend and development.

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3

Radi, B., J. C. Gelin, and A. Perriot. "Subdomain methods in structural mechanics." International Journal for Numerical Methods in Engineering 37, no. 19 (October 15, 1994): 3309–22. http://dx.doi.org/10.1002/nme.1620371907.

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4

Patnaik, Surya N., Rula M. Coroneos, and Dale A. Hopkins. "Compatibility conditions of structural mechanics." International Journal for Numerical Methods in Engineering 47, no. 1-3 (January 10, 2000): 685–704. http://dx.doi.org/10.1002/(sici)1097-0207(20000110/30)47:1/3<685::aid-nme788>3.0.co;2-y.

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Kröplin, B., D. Dinkler, and J. Hillmann. "An energy perturbation applied to nonlinear structural analysis." Computer Methods in Applied Mechanics and Engineering 52, no. 1-3 (September 1985): 885–97. http://dx.doi.org/10.1016/0045-7825(85)90019-2.

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6

Wrobel, Luiz Carlos. "Discretization methods in structural mechanics." Engineering Analysis with Boundary Elements 7, no. 3 (September 1990): 151. http://dx.doi.org/10.1016/0955-7997(90)90048-e.

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7

Chen, Cheng, and James M. Ricles. "Stability Analysis of Direct Integration Algorithms Applied to Nonlinear Structural Dynamics." Journal of Engineering Mechanics 134, no. 9 (September 2008): 703–11. http://dx.doi.org/10.1061/(asce)0733-9399(2008)134:9(703).

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Chen, Cheng, and James M. Ricles. "Stability Analysis of Direct Integration Algorithms Applied to MDOF Nonlinear Structural Dynamics." Journal of Engineering Mechanics 136, no. 4 (April 2010): 485–95. http://dx.doi.org/10.1061/(asce)em.1943-7889.0000083.

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Ricardo, Alverlando Silva, and Wellison José de Santana Gomes. "Structural Reliability Methods Applied in Analysis of Steel Elements Subjected to Fire." Journal of Engineering Mechanics 147, no. 12 (December 2021): 04021108. http://dx.doi.org/10.1061/(asce)em.1943-7889.0002023.

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Oñate, E., M. Cervera, and O. C. Zienkiewicz. "A finite volume format for structural mechanics." International Journal for Numerical Methods in Engineering 37, no. 2 (January 30, 1994): 181–201. http://dx.doi.org/10.1002/nme.1620370202.

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11

Martynov, Kirill, and Utz Wever. "On polynomial hyperreduction for nonlinear structural mechanics." International Journal for Numerical Methods in Engineering 118, no. 12 (March 6, 2019): 701–17. http://dx.doi.org/10.1002/nme.6033.

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12

Fernandes, Fábio A. O., Clauber Marques, Jovani Castelan, Daniel Fritzen, and Ricardo J. Alves de Sousa. "Learning Processes in Mechanics of Structures: Allying Analytical and Numerical Approaches." Education Sciences 10, no. 4 (April 20, 2020): 114. http://dx.doi.org/10.3390/educsci10040114.

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This paper reports pedagogical experiences and educational techniques in the field of Mechanics of Structures (Mechanical Engineering degree), resorting to computational tools. Several aspects are addressed, covering CAD (Computer-Aided Design) modelling systems to CAE (Computer-Aided Engineering) solutions, in terms of analysis and validation of mechanical resistance calculations. Therefore, structural mechanics fundamental concepts and mechanics of materials are also addressed. Particular focus is given on the development of curricula components related to Computer-Aided Design and Manufacturing. Doing so, three-dimensional structural modelling is applied to study the behaviour in selected simple case-studies where an external load is applied and the corresponding deflections are evaluated. Then, analytical and numerical analyses are performed and compared. During classes, patent aversion to solve analytical problems was clearly observed on the part of the students once calculus knowledge was required. The typical trend in engineering students, skipping the manual analytical methodology to solve a problem in order to go straight to numerical simulations via commercial Finite Element (FE) codes, was observed. The main focus of this work is, therefore, to determine the pedagogical effects of allying the analytical procedures and virtual simulators. It was possible to confirm the beneficial aspects of such methodology, considering that the regular engineering student has already a scientific basis on calculus and analytical process. Such knowledge will support mechanical project decisions, from model development to the analysis, and a sounding background to perform criticism of the results provided by the software.

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Zóltowski, Mariusz, and Ronald M. Martinod. "Quality identification methodology applied to wall-elements based on modal analysis." Multidiscipline Modeling in Materials and Structures 11, no. 4 (November 9, 2015): 507–16. http://dx.doi.org/10.1108/mmms-06-2015-0030.

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Purpose – The recommendation of structural standards, e.g. PN-B-03002, shows a need to control the production quality of wall-elements; the quality control demands suitable guidelines to fit the requirements of the current mass-production of the wall-elements, then, the structural standard recognizes the need of improving the methods to identify the real elements quality. The paper aims to discuss these issues. Design/methodology/approach – The proposed inspection methodology corresponds to assessment models that combine the numerical and symptomatic models to evaluate the critical levels of wall-elements, based on non-intrusive tests through the measurement of a set of signals, using the Experimental Modal Analysis (EMA)-based techniques. Findings – The presented work is developed with an approach that applies advanced calculating techniques used for the structural analysis in civil engineering focused on the technical state assessment. Originality/value – The paper proposes a diagnostic methodology that can be added to the current regulations and standards based on EMA techniques.

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14

Dias, A. P. C., A. L. Serpa, and M. L. Bittencourt. "High-order mortar-based element applied to nonlinear analysis of structural contact mechanics." Computer Methods in Applied Mechanics and Engineering 294 (September 2015): 19–55. http://dx.doi.org/10.1016/j.cma.2015.05.013.

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15

Han, Jian-Gang, Wei-Xin Ren, and Yih Huang. "A spline wavelet finite-element method in structural mechanics." International Journal for Numerical Methods in Engineering 66, no. 1 (2006): 166–90. http://dx.doi.org/10.1002/nme.1551.

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16

You-zhong, Guo. "On a method of structural analysis." Applied Mathematics and Mechanics 8, no. 6 (June 1987): 489–95. http://dx.doi.org/10.1007/bf02017396.

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17

Dhalla, A. K. "Creative Design-by-Analysis Solutions Applied to High-Temperature Components." Journal of Pressure Vessel Technology 115, no. 3 (August 1, 1993): 221–27. http://dx.doi.org/10.1115/1.2929520.

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Elevated temperature design has evolved over the last two decades from design-by-formula philosophy of the ASME Boiler and Pressure Vessel Code, Sections I and VIII (Division 1), to the design-by-analysis philosophy of Section III, Code Case N-47. The benefits of design-by-analysis procedures, which were developed under a US-DOE-sponsored high-temperature structural design (HTSD) program, are illustrated in the paper through five design examples taken from two U.S. liquid metal reactor (LMR) plants. Emphasis in the paper is placed upon the use of a detailed, nonlinear finite element analysis method to understand the structural response and to suggest design optimization so as to comply with Code Case N-47 criteria. A detailed analysis is cost-effective, if selectively used, to qualify an LMR component for service when long-lead-time structural forgings, procured based upon simplified preliminary analysis, do not meet the design criteria, or the operational loads are increased after the components have been fabricated. In the future, the overall costs of a detailed analysis will be reduced even further with the availability of finite element software used on workstations or PCs.

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18

Li, Jianan, Heping Xie, Ling Chen, Cong Li, and Zhiqiang He. "Exploring Deep-Rock Mechanics through Mechanical Analysis of Hard-Rock In Situ Coring System." Advances in Civil Engineering 2020 (September 7, 2020): 1–11. http://dx.doi.org/10.1155/2020/8899156.

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Exploration of deep-rock mechanics has a significant influence on the techniques of mining and rock mechanics. Rock coring technique is the basic method for all rock mechanics study. With the increase of the drilling depth and increasing strength of the hard rock, how to obtain high-quality rock core through various coring techniques is an eternal work. Here an innovative method is applied to design the new coring system to maximize the efficiency of operation. The stress conditions or parameters of rock core in the coring are analyzed, and the mechanism of the core with in situ stress is shown in this paper. The conflict of the core and coring tool chamber is proposed for the innovative design. The innovative design method is fulfilled by the theory of inventive problem solving (TRIZ). An improved coring system for the full-length core with in situ stress was obtained with the solutions of improved coring mechanism, cutting mechanism, and spiral drill pipe.

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19

Sanches, Rodolfo André Kuche, and Humberto Breves Coda. "Flexible Multibody Dynamics Finite Element Formulation Applied to Structural Progressive Collapse Analysis." Latin American Journal of Solids and Structures 14, no. 1 (January 2017): 52–71. http://dx.doi.org/10.1590/1679-78253112.

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20

Tokuda, N., T. Sakurai, and T. Teraoku. "Sloshing Analysis Method Using Existing FEM Structural Analysis Code." Journal of Pressure Vessel Technology 117, no. 3 (August 1, 1995): 268–72. http://dx.doi.org/10.1115/1.2842122.

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A fluid analysis method using an analogy relating the pressure wave equation of fluid to elasticity equations is applied to sloshing analysis, where existing FEM structural analysis codes are available. It is seen from theoretical consideration that the present method is equivalent to the classical FEM formulation of linear sloshing analysis. The numerical analyses of liquid sloshing in a rigid cubic tank and of vibration of tubulous fluid under gravitational force are performed by using the present method. The results are shown to be in excellent agreement with the theoretical values.

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21

Sadananda, Ramana. "A probabilistic approach to bone fracture analysis." Journal of Materials Research 6, no. 1 (January 1991): 202–6. http://dx.doi.org/10.1557/jmr.1991.0202.

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Bones are biological structural materials made of dynamically adaptable tissues. They can be considered as complex natural composite materials with load bearing constituents such as osteons and interstitial lamellae cemented with weak bonding materials. In addition, they contain Haversian and Volkmann canals that are functionally needed but are structurally weak. Because of large variation in microstructure, the strength of a bone varies from bone to bone and animal to animal. In this study the applicability of Weibull statistics to fracture strength of bones has been evaluated. The statistics is based on the weakest link theory and has been used successfully for probabilistic design of critical engineering structural components. The analysis shows that the statistics is valid when applied to each type of bone and it differentiates data from different types of bones. The analysis provides an insight in terms of how nature designs its load bearing structures by the process of natural selection.

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22

Zhou, X., and K. K. Tamma. "Algorithms by design with illustrations to solid and structural mechanics/dynamics." International Journal for Numerical Methods in Engineering 66, no. 11 (June 11, 2006): 1738–90. http://dx.doi.org/10.1002/nme.1559.

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23

Yin, Tao, Hong-ping Zhu, and Ling Yu. "Noise analysis for sensitivity-based structural damage detection." Applied Mathematics and Mechanics 28, no. 6 (June 2007): 741–50. http://dx.doi.org/10.1007/s10483-007-0604-3.

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24

Zeng, Pan. "Neural Computing in Mechanics." Applied Mechanics Reviews 51, no. 2 (February 1, 1998): 173–97. http://dx.doi.org/10.1115/1.3098995.

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Recently, the artificial neural network has experienced a surge in popularity and is now one of the most rapidly expanding areas of research across many disciplines. The main reason is in its powerful and adaptive abilities to treat various complex problems. One can be sure that with its further developments, neural networks will strongly impact many conventional disciplines from the standpoint of methodology. In the field of mechanics, the research and application of both neural network and revolutionary computing are especially active and successful. The back propagated multilayered network is one of the main types applied to engineering. The related works concern almost all topics of engineering science and mechanics, such as, approximation of structural analysis, assessment of structural damage, fault diagnosis, prediction, strategic management, decision making, structural optimization, etc. The aim of this review is to summarize and recapitulate the up-to-date developments and applications of neural networks and computing in mechanics, with emphasis on the back propagation algorithm of multilayer networks. Not only are the fundamental principles outlined clearly, but some typical examples are also presented. It is hoped that this review article can promote the development and applications of neural network and computing in mechanics. This article contains 221 references.

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25

Zhou, Feng, Yuan Yuan Cui, Liang Liang Wu, Yin Chen, Jie Yang, and Nan Huang. "TRIZ Based Tool Management Applied in Mechanical Heart Valve Engineering Systems." Advanced Materials Research 569 (September 2012): 521–24. http://dx.doi.org/10.4028/www.scientific.net/amr.569.521.

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Artificial mechanical heart valve (MHV) replacement is the common cardiovascular surgical procedure, yet its effect is far from satisfaction. Most important reasons lie in the model design and choice of the materials in the fabrication of the prosthetic heart valves. Based on systematic design methodology of TRIZ theory (Russian acronym for Theory of Solving Inventive Problem), the device structure is analyzed by comparing the past successful designs generated during the evolution of MHV. This paper represents a modeling technique integrating the well-established TRIZ with the conflict and contradiction modeling, substance-field and product functional analysis tools and provides some important trends in evolutionary development of production systems in MHV design. By analyzing the structural behavior and material performance, a complex case study from the research of different structural patterns and characteristics of current tri-leaflet modeling shows the validity of TRIZ theory to guide MHV design.

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26

Imura, Makoto, Tetsusei Kurashiki, Hiroaki Nakai, and Masaru Zako. "A Multi-Scale Analysis for an Evaluation of the Mechanical Properties of Composite Materials." Key Engineering Materials 334-335 (March 2007): 585–88. http://dx.doi.org/10.4028/www.scientific.net/kem.334-335.585.

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Fiber reinforced composite materials have been applied widely to many structures, because they have some advantages like easy handling, high specific strength, etc. The numerical method like finite element method has been applied to design and to evaluate the material properties and behavior as the development of Computer Aided Engineering. It is very difficult to calculate with accuracy not only in structural scale but also in detail material scale (for example, the order of fiber diameter) by the traditional FEM, becausecompositematerials like woven fabric composites have the geometrical complexityand the large difference between above mentioned scales. The development of multi-scale analysis method is one of the major topics in computational mechanics. Mesh superpositionis one of multi-scale analysis methods and is an effective method to solve the problems which have the large difference between the structure scale and the reinforcement scale. We have expanded the finite element mesh superposition method with 3 scales and have defined as M3 (Macro-Meso-Micro) method. In this paper, we have proposed a new approach method combined with M3 method and homogenized method to obtain the mechanical properties and to simulate the behavior of woven fabric composites. In addition, the elastic-plastic mechanics and the damage mechanics have been introduced into M3 method to investigate the effects of matrix-crack on the structural and material properties. From the numerical results, it is revealed that it is very useful for the evaluation of mechanical properties of composite materials.

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27

Boudounit, Hicham, Mostapha Tarfaoui, Dennoun Saifaoui, and Mourad Nachtane. "Structural analysis of offshore wind turbine blades using finite element method." Wind Engineering 44, no. 2 (May 23, 2019): 168–80. http://dx.doi.org/10.1177/0309524x19849830.

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Wind energy is one among the most promising renewable energy sources, and hence there is fast growth of wind energy farm implantation over the last decade, which is expected to be even faster in the coming years. Wind turbine blades are complex structures considering the different scientific fields involved in their study. Indeed, the study of blade performance involves fluid mechanics (aerodynamic study), solids mechanics (the nature of materials, the type of solicitations …), and the fluid coupling structure (IFS). The scope of the present work is to investigate the mechanical performances and structural integrity of a large offshore wind turbine blade under critical loads using blade element momentum. The resulting pressure was applied to the blade by the use of a user subroutine “DLOAD” implemented in ABAQUS finite element analysis software. The main objective is to identify and predict the zones which are sensitive to damage and failure as well as to evaluate the potential of composite materials (carbon fiber and glass fiber) and their effect on reduction of rotor’s weight, as well as the increase of resistance to wear, and stiffness.

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28

Akimov, Pavel A. "Correct Indirect Discrete-Continual Boundary Element Method of Structural Analysis." Advanced Materials Research 671-674 (March 2013): 1614–18. http://dx.doi.org/10.4028/www.scientific.net/amr.671-674.1614.

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This paper is devoted to so-called indirect discrete-continual boundary element method of structural analysis. Operational formulation of the problem is given. Using fundamental operational relations of indirect approach after construction of corresponding fundamental matrix-function in a special form convenient for problems of structural mechanics and its application resolving set of differential equations with operational coefficients is obtained. The discrete-continual design model for structures with constant physical and geometrical parameters in one direction is offered on the basis of so-called discrete-continual boundary elements. Basic pseudodifferential operators are approximated discretely by Fourier series. Fourier transformations and Wavelet analysis can be applied as well.

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29

Ford, DG, MHN Widiyarto, A. Myers, AP Longstaff, and S. Fletcher. "Structural analysis and characterisation technique applied to a CNC vertical machining centre." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 228, no. 13 (January 7, 2014): 2357–71. http://dx.doi.org/10.1177/0954406213517496.

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There is a requirement for improved 3D surface characterisation and reduced tool wear, when modern computer numerical-controlled (CNC) machine tools are operating at high cutting velocities, spindle speeds and feed-rates. This research project investigates vibration-induced errors on a CNC vertical machining centre under dynamic conditions. A model of the machine structural dynamics is constructed using the Finite Element Method (FEM) for the comprehensive analytical investigation of the machine vibration behaviour. The analytical model is then validated against the measured results obtained from an experimental modal analysis (EMA) investigation. A correlation analysis of the simulated and experimental modal analysis results is undertaken in order to improve the accuracy of the model and minimise modelling practice errors. The resulting optimised model will need further sensitivity analysis utilising parametric structural analysis and characterisation techniques in order to identify a potential for vibration reduction using passive methods.

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30

Shu, Li, Wang Bo, and Hu Ji-zhong. "Sensitivity analysis based on Lanczos algorithm in structural dynamics." Applied Mathematics and Mechanics 24, no. 1 (January 2003): 92–98. http://dx.doi.org/10.1007/bf02439382.

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31

CHONG, WOO SUK, MI YEON SHIN, and CHANG HO YU. "STRUCTURAL ANALYSIS OF CARBON COMPOSITE FRAME FOR FOLDABLE ELECTRIC WHEELCHAIR DEVELOPMENT." Journal of Mechanics in Medicine and Biology 19, no. 07 (November 2019): 1940045. http://dx.doi.org/10.1142/s0219519419400451.

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Electric wheelchairs developed so far have difficulties for elderly people to use, because of their bulkiness and heavy weight. To address this problem, this study presents a design for the construction of an electric wheelchair with an application of light duty materials at frame and a foldable structure that can be easily loaded in a narrow space. A structural analysis was performed to evaluate the structural safety of the foldable wheelchair. For the purpose of analysis, a carbon composite was used as the material for the frame; Structure Mechanics Module of COMSOL Multiphysics was used as the analysis software; and for the boundary condition, the lower part of the body frame was fixed, and a load of 150[Formula: see text]kg was applied to the upper part of the wheelchair. According to the results of the structural analysis, a maximum displacement of 2.869[Formula: see text]mm occurred at the handle where the carbon composite was applied, and tensile and compressive stress of 103[Formula: see text]MPa and 107.3[Formula: see text]MPa, respectively, were measured at the seat part of the wheelchair where the load was applied. The safety factors were 7.5 and 5.5 for tensile stress and compressive stress, respectively. A maximum variation of 0.0872[Formula: see text]mm occurred at the aluminum wheel shaft, and a maximum variation of 0.2046[Formula: see text]mm occurred at the joint. The maximum stress was 116.3[Formula: see text]MPa that corresponded to a safety factor of 2.66; this indicates that the wheelchair can be considered to be structurally safe as the safety factor exceeds the initial target of 2.

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32

Farhat, Charbel, Luis Crivelli, and Francois-Xavier Roux. "A transient FETI methodology for large-scale parallel implicit computations in structural mechanics." International Journal for Numerical Methods in Engineering 37, no. 11 (June 15, 1994): 1945–75. http://dx.doi.org/10.1002/nme.1620371111.

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33

Liu, Jimin, Hua Cheng, Chuanxin Rong, and Changbai Wang. "Analysis of Cusp Catastrophic Model for Vertical Stability of Drilling Shaft Lining." Advances in Civil Engineering 2020 (December 10, 2020): 1–13. http://dx.doi.org/10.1155/2020/8891751.

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The vertical stability analysis of the drilling shaft lining has long been a technical problem in the construction of underground space development projects. And the critical depth of vertical stability was a key parameter to judge its stability. To determine this parameter, a simple and practical computational method would be helpful. In this paper, a new vertical stability analysis model of shaft lining structure based on catastrophe theory was proposed. In accordance with the mechanical analysis, the catastrophic instability mechanics was analyzed and a new critical depth of drilling shaft lining was deduced. Further, the rationality and feasibility of the catastrophic calculation model was proved by the numerical simulation results in a case. And the sensitivity of the influencing parameters was also analyzed, which provided theoretic reference for optimization design and guiding security construction. The results implied that catastrophic calculation model, as an alternative method for shaft stability analysis, could be applied to theoretical analysis and guiding engineering practice in the study of drilling shaft lining’s vertical stability.

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Prassas, Elena Shenk, Roger P. Roess, and William R. McShane. "Cluster Analysis as Tool in Traffic Engineering." Transportation Research Record: Journal of the Transportation Research Board 1566, no. 1 (January 1996): 39–48. http://dx.doi.org/10.1177/0361198196156600105.

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Regression analysis is a very common tool in traffic engineering analysis, partly because of the professional backgrounds of those doing the analysis but, perhaps, primarily because of an underlying premise that traffic can be described by deterministic models on which the observations have some randomness or imprecision superimposed. In this view, the “noise” can be filtered out by more observations and more precise observations, and the underlying deterministic model can then be identified. Another totally different underlying premise is that there are a finite number of distinct “states” or conditions in which the system may rest, with significant truly random deviations around each such equilibrium. If this premise is adopted, regression analysis is not a tool suitable for analysis and can provide misleading insights and meaningless relations. This paper applies the tool of cluster analysis to a set of traffic engineering data (specifically, left-turn factors in shared lanes) in which deterministic modeling and regression analysis have been applied in the past. Cluster analysis proved to be a powerful exploratory technique and helped identify several distinct modalities within the data. These can be explained by an underlying model based on a finite number of equilibrium states with significant random components or by an underlying model in which the process is truly stochastic and not at all deterministic, so that mild trends with considerable data scatter are to be routinely expected.

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35

Xiang-sheng, Cheng. "The applications of generalized variational principles in nonlinear structural analysis." Applied Mathematics and Mechanics 14, no. 5 (May 1993): 417–28. http://dx.doi.org/10.1007/bf02453762.

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36

Kaveh, A., and H. Rahami. "Block diagonalization of adjacency and Laplacian matrices for graph product; applications in structural mechanics." International Journal for Numerical Methods in Engineering 68, no. 1 (2006): 33–63. http://dx.doi.org/10.1002/nme.1696.

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37

Maghami, Ali, and Dominik Schillinger. "A stiffness parameter and truncation error criterion for adaptive path following in structural mechanics." International Journal for Numerical Methods in Engineering 121, no. 5 (November 12, 2019): 967–89. http://dx.doi.org/10.1002/nme.6253.

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38

Samuelsson, A., N.-E. Wiberg, and L. Bernspång. "A study of the efficiency of iterative methods for linear problems in structural mechanics." International Journal for Numerical Methods in Engineering 22, no. 1 (January 1986): 209–18. http://dx.doi.org/10.1002/nme.1620220115.

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39

Useche, Jairo F., and Guillermo Giraldo. "Design based on reliability of naval multilayer fiber composite panels using evolutionary algorithms and stochastic structural mechanics." Ciencia y tecnología de buques 7, no. 13 (July 30, 2013): 47. http://dx.doi.org/10.25043/19098642.83.

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The complexity of sea wave loads and the number of design variables involved in the design of laminated composites for naval applications makes this a challenging problem. Traditional methodologies for engineering design and analysis are not suitable to deal with these kinds of design problems. This work presents a methodology based on evolutionary algorithms and stochastic structural mechanics to design high-reliability naval multilayer composite structural panels.. The mechanical response of structural panels was modeled by using the Multilayer First Order Shear Deformable Plate Theory and the Finite Element Method. Sea wave loads were modeled as stochastic dynamic loads by using the Simulation Based Reliability Analysis approach. The structural reliability of the panel, as a function of the composite ply’s fiber direction, was considered a design variable. In order to maximize the structural reliability, an optimization methodology based on Genetic Algorithms was proposed. For the design process, a computational code using FORTRAN® and the OpenMP® library for parallel computing was developed. The proposed methodology was applied to the design of composite naval panels and results were compared to those obtained through traditional design methodologies. The results show increased reliability of the panels in all cases analyzed. The proposed methodology is, thus, shown as a reliable engineering tool to optimize the structural performance of existing designs.

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Hammoum, Hocine, Amar Aliche, Karima Bouzelha, Younes Aoues, Ouali Amiri, and Youcef Mehani. "Fragility analysis of concrete elevated water tanks under seismic loads." Frattura ed Integrità Strutturale 15, no. 57 (June 22, 2021): 93–113. http://dx.doi.org/10.3221/igf-esis.57.09.

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The design of concrete elevated water tanks involves several kinds of uncertainties. Traditionally, the design of these structures is based on a deterministic analysis. Partial safety factors prescribed in design codes are applied to take into account these uncertainties and to ensure sufficiently safe design. However, this approach does not allow rational evaluation of the risk related to the structural failure and consequently its reliability. In fact, the partial safety factors can lead to over-designed structures; or to under designed structural components leading to a lack of structural robustness. In this study, a probabilistic approach based on Monte Carlo simulations is used to analyze the reliability of elevated water tanks submitted to hazard seismic loading. This reliability approach, takes into account mainly two parameters. Firstly, the hydraulic charge in the tank container which is a function of time, and secondly, the hazard seismic loading through the Peak Ground Acceleration is considered as a random variable. Fragility curves depending on seismic zones and soil types are obtained by using the probabilistic approach, where they demonstrate the dominant failure modes that can cause the structural failure with respect to different seismic levels, soil types and water height level in the tank container.

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Borri, A., and S. Sorace. "FE Analysis Strategies for Structural Materials With Small Tensile Strength." Journal of Pressure Vessel Technology 115, no. 2 (May 1, 1993): 156–63. http://dx.doi.org/10.1115/1.2929510.

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A review of the “smeared crack” approach to the finite element analysis of small tensile strength (STS) materials is presented. The most widely applied strategies for crack modeling, shear transfer mechanism, and the definition of the mechanical constitutive laws and failure criteria are critically discussed. The models and special options in the ANSYS, ADINA, and ABAQUS programs are considered in detail, and applied to the analysis of a square panel under boundary pressures. The three solutions were compared in terms of the final broadening of the panel cracked zones. The results of the analysis of an hemispherical dome over a cylindrical drum are also presented. The Romulus Temple in the Roman Forum was the reference structure for this FE model. The problem was analyzed by a special procedure using the ANSYS “concrete” element. The results were compared with those of a “discrete crack” solution which reproduced the real cracked configuration of the building, and then with an experimental survey carried out by the flat jack technique.

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Toklu, Yusuf Cengiz, Gebrail Bekdaş, Melda Yücel, Sinan Melih Nigdeli, Aylin Ece Kayabekir, Sanghun Kim, and Zong Woo Geem. "Total Potential Optimization Using Metaheuristic Algorithms for Solving Nonlinear Plane Strain Systems." Applied Sciences 11, no. 7 (April 3, 2021): 3220. http://dx.doi.org/10.3390/app11073220.

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Total Potential Optimization using Metaheuristic Algorithms (TPO/MA) is an alternative tool for the analysis of structures. It is shown that this emerging method is advantageous in solving nonlinear problems like trusses, tensegrity structures, cable networks, and plane stress systems. In the present study, TPO/MA, which does not need any specific implementation for nonlinearity, is demonstrated to be successfully applied to the analysis of plane strain structures. A numerical investigation is performed using nine different metaheuristic algorithms and an adaptive harmony search in linear analysis of a structural mechanics problem having 8 free nodes defined as design variables in the minimization problem of total potential energy. For nonlinear stress-strain relation cases, two structural mechanics problems, one being a thick-walled pipe and the other being a cantilever retaining wall, are analyzed by employing adaptive harmony search, which was found to be the best one in linear analyses. The nonlinear stress-strain relations considered in these analyses are hypothetical ones due to the lack of any such relationship in the literature. The results have shown that TPO/MA can solve nonlinear plane strain problems that can be encountered as engineering problems in structural mechanics.

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Labeas, G. N., and S. D. Belesis. "Efficient analysis of large-scale structural problems with geometrical non-linearity." International Journal of Non-Linear Mechanics 46, no. 10 (December 2011): 1283–92. http://dx.doi.org/10.1016/j.ijnonlinmec.2011.05.002.

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Shin, Jong Gye, and Cheol Ho Ryu. "Nonlinear Kinematic Analysis of the Deformation of Plates for Ship Hull Fabrication." Journal of Ship Research 44, no. 04 (December 1, 2000): 270–77. http://dx.doi.org/10.5957/jsr.2000.44.4.270.

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Curved plates in a ship's hull are fabricated by mechanical or thermal processes, such as roller bending and line heating methods. The formation of curved plates is a process in which, from the point of view of mechanics, permanent bending and/or in-plane strains are applied to flat plates. Only bending strains are applied to single curvature shells, while in-plane strains, in addition to bending strains, need to be applied in order to form double curvature shells. In-plane strains, however, are known to be small and, thus, can be neglected. The mechanics of plate bending is different from the production of plate bending. In the mechanics of plate bending, an initial configuration of a plate is given, along with boundary and loading conditions. The deformed shape can then be calculated. In the production of plate bending, however, only the final deformation shape is given and the initial configuration is unknown. Loading conditions must also be determined. This paper presents rigorous formulations of a kinematic problem for the production of plate bending. Nonlinear kinematic analysis with and without initial imperfections is employed in order to include in-plane strains. An algorithm is suggested to determine an initial configuration from given surface data. Numerical examples show that the in-plane strain must not be negligible and, rather, plays an important role in the determination of heating paths in the line heating method.

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Mansour, A. E., and L. Hovem. "Probability-Based Ship Structural Safety Analysis." Journal of Ship Research 38, no. 04 (December 1, 1994): 329–39. http://dx.doi.org/10.5957/jsr.1994.38.4.329.

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This paper provides a demonstration on the use of probability-based ship structural safety analysis and enumerates the benefits in comparison with traditional methods. Reliability techniques are developed to determine safety levels of existing vessels, taking into consideration uncertainties in loads, strength and calculation procedures. Ultimate, serviceability and fatigue limit states are developed and applied to an existing tanker. The corresponding load models are examined and, in some instances, further developed. Safety indices associated with yielding, buckling, and fatigue are calculated. Conclusions are drawn regarding the benefits and drawbacks of using probability-based ship safety analysis. This paper provides a demonstration on the use of probability-based ship structural safety analysis and enumerates the benefits in comparison with traditional methods. Reliability techniques are developed to determine safety levels of existing vessels, taking into consideration uncertainties in loads, strength and calculation procedures. Ultimate, serviceability and fatigue limit states are developed and applied to an existing tanker. The corresponding load models are examined and, in some instances, further developed. Safety indices associated with yielding, buckling, and fatigue are calculated. Conclusions are drawn regarding the benefits and drawbacks of using probability-based ship safety analysis.

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Casenave, Fabien, Nissrine Akkari, Felipe Bordeu, Christian Rey, and David Ryckelynck. "A nonintrusive distributed reduced‐order modeling framework for nonlinear structural mechanics—Application to elastoviscoplastic computations." International Journal for Numerical Methods in Engineering 121, no. 1 (September 10, 2019): 32–53. http://dx.doi.org/10.1002/nme.6187.

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Cao, Lei, Xue Jin Shen, and Ru Yan Li. "Three-Dimensional Thermal Analysis of Spherical Plain Bearings with Self-Lubricating Fabric Liner." Advanced Materials Research 97-101 (March 2010): 3366–70. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.3366.

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Finite element analysis and corresponding experimental comparisons of temperature were performed to investigate the thermal behaviour of spherical plain bearings with self-lubricating fabric liner. Based on the theory of heat transfer, tribology and composite material mechanics, a sequentially coupled, 3D, thermo-mechanical finite element analysis model of the bearing system was built up, in which the steady-state temperature distribution from the thermal analysis was applied as a body load to the structural model. As a result, the maximum steady-state temperature of 78.1°C, von Mises stress of 299MPa, displacement of 0.0806mm along Z axis of the bearing are presented, together with the maximum contact pressure of 324MPa which are significant in the structural design and optimization of these bearings. The effect of temperature rise on the contact pressure distribution is discussed. The agreement of the temperature computation results with the experimental data indicates that this method could be used to analyze virtually any such bearing.

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MacNeal, Bruce E. "Finite element analysis of electromagnetic fields in the form of structural mechanics." Finite Elements in Analysis and Design 7, no. 4 (February 1991): 271–77. http://dx.doi.org/10.1016/0168-874x(91)90042-w.

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MENG, HSIEN-KANG, and WEI-LING CHIANG. "APPLICATION OF IDENTIFICATION OF FUZZY MODEL IN STRUCTURAL MECHANICS." International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems 02, no. 03 (September 1994): 297–304. http://dx.doi.org/10.1142/s0218488594000249.

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In the conventional analysis of structural mechanics, the structural behaviour are determined in mathematical functions and based on idealized assumptions. But structural members do not behaviour as the description of the mathematical functions if the system is too complicated. Consequently, we don't have an appropriate methodology and an convenient algorithm to utilize. If we identify the structural system with a fuzzy model, [Formula: see text], where [Formula: see text] is the fuzzy relation, the procedure of the system identification will be simplified and the model can be quickly constructed 110 matter the style of nonlinear form and the orders. In this paper, four composition operators (α, β, φ and t) will be used to derive fuzzy relations from given data and then applied to two interesting problems of structural mechanics for illustrating the reliability ty and efficiency of the theory of fuzzy model.

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Dai, Yuting, Linpeng Wang, Chao Yang, and Xintan Zhang. "Dynamic Gust Load Analysis for Rotors." Shock and Vibration 2016 (2016): 1–12. http://dx.doi.org/10.1155/2016/5727028.

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Dynamic load of helicopter rotors due to gust directly affects the structural stress and flight performance for helicopters. Based on a large deflection beam theory, an aeroelastic model for isolated helicopter rotors in the time domain is constructed. The dynamic response and structural load for a rotor under the impulse gust and slope-shape gust are calculated, respectively. First, a nonlinear Euler beam model with 36 degrees-of-freedoms per element is applied to depict the structural dynamics for an isolated rotor. The generalized dynamic wake model and Leishman-Beddoes dynamic stall model are applied to calculate the nonlinear unsteady aerodynamic forces on rotors. Then, we transformed the differential aeroelastic governing equation to an algebraic one. Hence, the widely used Newton-Raphson iteration algorithm is employed to simulate the dynamic gust load. An isolated helicopter rotor with four blades is studied to validate the structural model and the aeroelastic model. The modal frequencies based on the Euler beam model agree well with published ones by CAMRAD. The flap deflection due to impulse gust with the speed of 2m/s increases twice to the one without gust. In this numerical example, results indicate that the bending moment at the blade root is alleviated due to elastic effect.

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