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Littérature scientifique sur le sujet « Dynamic stress analysis »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 1 février 2022

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Articles de revues sur le sujet "Dynamic stress analysis"

Zhang, Fu Yuan, Deng Yuan Zhu, Shou Ren Ge et Xiao Bao Sun. « Dynamic Finite Element Analysis for Contact Stress of Dynamic Consolidation ». Applied Mechanics and Materials 353-356 (août 2013) : 502–6. http://dx.doi.org/10.4028/www.scientific.net/amm.353-356.502.

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Based on Abaqus/explicit dynamics finite element program, an ax symmetrical numerical model, the infinite fringe condition and friction contact condition were built, and then the surface contact stress condition of the dynamic consolidation was studied. The time-load properties of dynamic consolidation, the spread law of contact pressure for rammer bottom and the friction influence to contact stress between the hammer and foundation were gained. The results indicate that the dynamic consolidation load can be simplified to triangular load with the weight of the hammer itself; the contact stress distribution between the hammer and the foundation is not uniform; and frictionless contact hypothesis can led errors to the simulated result.

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Wang, Wenjing, Li Kai, Randy Gu et Anand Asundi. « Dynamic Stress Concentration – a Hybrid Analysis ». Physics Procedia 19 (2011) : 220–26. http://dx.doi.org/10.1016/j.phpro.2011.06.152.

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Hirai, Tsuneo, Tsutao Katayama et Hidetake Yamamoto. « Dynamic Stress Analysis of Fracture Callus. » Transactions of the Japan Society of Mechanical Engineers Series A 59, n^o 560 (1993) : 1173–78. http://dx.doi.org/10.1299/kikaia.59.1173.

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Hirai, Tsuneo, Tsutao Katayama et Hidetake Yamamoto. « Dynamic Stress Analysis of Fracture Callus ». JSME international journal. Ser. A, Mechanics and material engineering 38, n^o 2 (15 avril 1995) : 242–48. http://dx.doi.org/10.1299/jsmea1993.38.2_242.

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Teixeira de Freitas, J. A., et Z. M. Wang. « Elastoplastic dynamic analysis with hybrid stress elements ». International Journal for Numerical Methods in Engineering 53, n^o 3 (2001) : 515–37. http://dx.doi.org/10.1002/nme.282.

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AMADA, Shigeyasu. « Dynamic stress analysis of rotating hollow discs. » Transactions of the Japan Society of Mechanical Engineers Series A 51, n^o 469 (1985) : 2103–11. http://dx.doi.org/10.1299/kikaia.51.2103.

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AMADA, Shigeyasu. « Dynamic Stress Analysis of Hollow Rotating Discs ». Bulletin of JSME 29, n^o 251 (1986) : 1383–89. http://dx.doi.org/10.1299/jsme1958.29.1383.

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Ramamurti, V., et N. C. Narayanan. « Dynamic stress analysis of roller clutch sleeve ». Computers & ; Structures 33, n^o 2 (janvier 1989) : 403–10. http://dx.doi.org/10.1016/0045-7949(89)90011-4.

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Zhao, Jin Bin, Hui Meng Zhao, Xiao Liu et Jie Meng. « Dynamic Feature Analysis for Silty Sand ». Advanced Materials Research 1089 (janvier 2015) : 223–27. http://dx.doi.org/10.4028/www.scientific.net/amr.1089.223.

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Dynamic shear modulus is proportional to average principal stress.Cyclic varied surrounding pressure isn't proportional to cyclic varied pore water pressure.The dynamic triaxial test with cyclic surrounding pressure can apply cyclic surrounding pressure.The dynamic triaxial test with cyclic surrounding pressure can apply cyclic surrounding pressure in addition to the cyclic deviator stress and it can simulate the coupling of cyclic shear stress and it can simulate the coupling of cyclic shear stress and cyclic normal stress in an earthquakes.

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Liu, Hong Bin, Lei Zhang et Yong Sheng Shi. « Dynamic Finite Element Analysis for Tapered Roller Bearings ». Applied Mechanics and Materials 533 (février 2014) : 21–26. http://dx.doi.org/10.4028/www.scientific.net/amm.533.21.

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Based on the finite element method of explicit dynamics and contact dynamics mechanics, a three dimensional solid finite element model was developed introducing physical elements for tapered roller bearing. The dynamic process numerical simulation of tapered roller bearing was carried out in ABAQUS. The vibration curves of the nodes on roller were drew. The changes of contact stress and contact stress distribution of rings, rollers and the cage in the process were analyzed. The results show it is basically consistent with the actual movement of rolling bearings.

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Thèses sur le sujet "Dynamic stress analysis"

Ishii, Kohki. « Design and Stress Analysis of Dynamic Spinal Stabilizers ». OpenSIUC, 2010. https://opensiuc.lib.siu.edu/theses/270.

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A dynamic lumbar spinal stabilizer with a helical machined spring element was created in the first stage. The stabilizer was built with 30 N/mm of axial stiffness because if the human body is moved to flexion and extension, this amount of a compressive and tensile load would be applied to the intervertebral disc. The stabilizer supports the loads instead of the disc. The stiffness was influenced by the number of coils, the thickness of coils, and length of the coil element. The stiffness can be determined by analytical equations or by finite element analysis (FE), such as ANSYS Workbench. In the second stage, the lumbar spine FE model was successfully constructed by using Autodesk Inventor 2010. There were three different analyzed models; (1) intact model, (2) fused model, and (3) dynamically stabilized model. This intact model is a simplified and basic model used for fused model and dynamically stabilized model. The range of motion (ROM) was the key term in this study. In other words, examination of each model was based on how much ROM was shown when the flexion, extension, and bending moments have been applied on the spine. The ROM of each model with three moments produced appropriate values compared to the references. The stress analysis is also important to optimize the design of the dynamic stabilizer. The maximum stress was 472 MPa on the stabilizer that is less than yield strength of Titanium alloy.

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Yi, Jun 1959. « Stress compatible bimaterial interface elements with application to transient dynamic stress analysis ». Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=22842.

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Conventional displacement-based finite element programs do not yield unique values of stress components which ought to be continuous at element interfaces. The errors, being the differences from the correct unique values, become unacceptably large at a bimaterial interface when the moduli of the two materials are significantly different.
This thesis formulates and implements new finite elements for obtaining the correct values of the stress components, both continuous and discontinuous ones, at bimaterial interface points under general dynamic loading, assuming linear, isotropic, elastic material behaviour.
The constructed finite elements programs, suitable for analyzing two-dimensional and axisymmetric three-dimensional problems, have been validated by comparing the predicted responses with the exact analytical solutions of some non-trivial impact loading (wave-propagation) problems.
The work provides a necessary tool for analyzing and designing composite structures, for example prosthetic knee and hip joints in the biomechanics field.

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Mikucka, Vita. « Dynamic problems for interface cracks under harmonic loading ». Thesis, University of Aberdeen, 2015. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=228606.

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This thesis is devoted to solution of the two-dimensional elastodynamic problem for a cracked bimaterial loaded by harmonic waves. The system of boundary integral equations for displacements and tractions at the interface is obtained from Somigliana identity with the allowance for the contact interaction of the opposite crack faces. Full expressions of the integral kernels derived by the consecutive differentiation of the Green's displacement tensor are given. Due to the contact that takes place between the faces of the crack under the applied external loading, the resulting process is a steady-state periodic, but not a harmonic one. Thus, components of the stress-strain state are expanded into exponential Fourier series. The collocation method with a piecewise constant approximation on each linear continuous boundary element is used for the numerical solution. The problem is solved using the iterative algorithm. The solution is refined during the iteration process until the distribution of physical values satisfies the imposed constraints. The results are obtained for the interface crack subject to normal tension-compression, normal shear, or oblique tension-compression waves with different values of the angle of the wave incidence and the wide range of the dimensionless wave number. The distributions of the normal and tangential components of the contact forces and displacement discontinuities on the surface of the crack are investigated. The stress intensity factors are computed and analyzed for various values of the wave frequency, the friction coefficient, and material properties. The maximal stress intensity factors at the trailing crack tip differ from the SIF values at the leading crack tip showing non-symmetry of solution with respect the space and time variables. It is concluded that the crack closure and friction effect change the solution both qualitatively and quantitatively, as the difference between comparable results can achieve 30-50%.

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Halepli, A. R. (A Reymond). « A comparative dynamic and static stress analysis of a prosthetically resurfaced tibia / ». Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63331.

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Shao, Qing. « Stress relaxation behavior of heat-aged Makrolon polycarbonate using dynamic mechanical analysis ». Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0020/MQ54645.pdf.

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Johnson, Catherine E. « Fragmentation Analysis in the Dynamic Stress Wave Collision Regions in Bench Blasting ». UKnowledge, 2014. http://uknowledge.uky.edu/mng_etds/16.

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The first step in many mining operations is blasting, and the purpose of blasting is to fragment the rock mass in the most efficient way for that mine site and the material end use. Over time, new developments to any industry occur, and design and implementation of traditional techniques have to change as a consequence. Possibly the greatest improvement in blasting in recent years is that of electronic detonators. The improvements related to safety and increased fragmentation have been invaluable. There has been ongoing debate within the explosives industry regarding two possible theories for this. Shorter timing delays that allow interaction between adjacent shock waves or detonation waves, or the increase in accuracy associated with electronic detonators. Results exist on the improved accuracy of electronic detonators over that of electric or non-electric, but data on the relationship between the collision of dynamic stress waves and fragmentation is less understood. Publications stating that the area of greatest fragmentation will occur between points of detonation where shock waves collide exist, but experimental data to prove this fact is lacking. This dissertation looks extensively at the head on collision of shock (in the rock mass) and detonation (in the detonation column) waves with relation to fragmentation through a number of small scale tests in concrete. Timing is a vital tool for this collision to occur and is the variable utilized for the studies. Small scale tests in solid masonry blocks, 15 x 7⅞ x 7⅞ inches in size, investigated shock and detonation wave collisions with instantaneous detonation. Blocks were wrapped in geotextile fabric and a wire mesh to contain the fragments so that in situ tensile crack formations could be analyzed. Detonating cord was used as the explosive with no stemming to maintain the shock pressure but reduce the gas pressure phase of the fragmentation cycle. Model simulations of these blocks in ANSYS Autodyn looked at the stress and pressure wave patterns and corresponding damage contours for a direct comparison with the experimental investigation. Detonation wave collision in a single blast hole was found to positively influence the fragmentation and throw of the material. Mean fragment size decreased compared to tests with no detonation wave collision. Area of greatest throw occurred at the point of detonation collision where a buildup of gas pressure exited the block from one location. Head on collision of shock waves did not positively influence the muck pile. Largest fragments were located at the point of shock collision. The lack of particle velocity with relation to shock collision in previous literature could be attributed to the increased particle size here. Directional particle velocities could actually increase the strength and density of the rock at this location, decreasing the degree of fragmentation rather than increasing it.

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Ye, Wei. « Nano-heteroepitaxy stress and strain analysis : from molecular dynamic simulations to continuum methods ». Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34752.

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For decades, epitaxy is used in nanotechnologies and semiconductor fabrications. So far, it's the only affordable method of high quality crystal growth for many semiconductor materials. Heterostructures developed from these make it possible to solve the considerably more general problem of controlling the fundamental parameters inside the semiconductor crystals and devices. Moreover, as one newly arising study and application branch of epitaxy, selective area growth (SAG) is widely used to fabricate materials of different thicknesses and composition on different regions of a single wafer. All of these new and promising fields have caught the interests and attentions of all the researchers around the world. In this work, we will study the stress and strain analysis of epitaxy in nano-scale materials, in which we seek a methodology to bridge the gap between continuum mechanical models and incorporate surface excess energy effects, which can be obtained by molecular dynamical simulations. We will make a brief description of the elastic behavior of the bulk material, covering the concepts of stress, strain, elastic energy and especially, the elastic constants. After that, we explained in details about the definitions of surface/interface excess energy and their characteristic property tensors. For both elastic constants and surface excess energy, we will use molecular dynamic simulations to calculate them out, which is mainly about curve-fitting the parabola function between the total strain energy density and the strain. After this, we analyzed the stress and strain state in nanoisland during the selective area growth of epitaxy. When the nanoisland is relaxed, the lattice structure becomes equilibrated, which means the total strain energy of system need to be minimized. Compared to other researcher's work, our model is based on continuum mechanics but also adopts the outcome from MD simulations. By combining these microscopic informations and those macroscopic observable properties, such as bulk elastic constants, we can provide a novel way of analyzing the stress and strain profile in epitaxy. The most important idea behind this approach is that, whenever we can obtain the elastic constants and surface property tensors from MD simulations, we can follow the same methodology to analyse the stress and strain in any epitaxy process. This is the power of combining atomistic simulations and continuum method, which can take considerations of both the microscopic and macroscopic factors.

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Mahmood, Rashid. « Static and dynamic finite element stress analysis of layered composite plates and shells ». Thesis, Cranfield University, 1989. http://hdl.handle.net/1826/4048.

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In this work an attempt has been made to develop theories for finite element static and dynamic stress analysis tailored for use with composite layered plates and shells in this way it was hoped to provide accurate values of the stresses particularly transverse shear stresses through the thickness, and to perform accurate natural frequency analysis by including non-linear effects such as centrifugal stiffening. Initial derivations were based upon first order facet shell element analysis and first order curved shell element analysis. Subsequently, derivations were produced for higher order element analysis. A programming package has been developed based upon the above derivations, and containing a banded solver as well as a frontal solver, capable of analysing structures build up from uniform or variable thickness layers and with a multiple number of layers having constant or variable dimension. Results obtained with the aid of the present package have been compared with results derived from experimental work as well as with results derived from available analytical solutions. Investigations have been carried out for existing compressor blades, made of isotropic material and layered composite material, respectively. The results obtained from the package have been compared with available experimental results produced by RR or carried out at Cranfield. It has been shown that the above mentioned derivations produce comparable results and the package has proved to be reliable and accurate.

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Oet, Mikhail V. « Financial stress in an adaptive system : From empirical validity to theoretical foundations ». Case Western Reserve University School of Graduate Studies / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1459347548.

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Katsanis, George R. Mr. « Transient Small Wind Turbine Tower Structural Analysis with Coupled Rotor Dynamic Interaction ». DigitalCommons@CalPoly, 2013. https://digitalcommons.calpoly.edu/theses/960.

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Structural dynamics is at the center of wind turbine tower design - excessive vibrations can be caused by a wide range of environmental and mechanical sources and can lead to reduced component life due to fatigue, noise, and impaired public perception of system integrity. Furthermore, periodic turbulent wind conditions can cause system resonance resulting in significantly increased structural loads. Structural vibration issues may become exacerbated in small wind applications where the analytical and experimental resources for system verification and optimization are scarce. This study combines several structural analysis techniques and packages them into a novel and integrated form that can be readily used by the small wind community/designer to gain insight into tower/rotor dynamic interaction, system modal characteristics, and to optimize the design for reduced tower loads and cost. The finite element method is used to model the tower structure and can accommodate various configurations including fixed monopole towers, guy-wire supported towers, and gin-pole and strut supported towers. The turbine rotor is modeled using the Equivalent Hinge-Offset blade model and coupled to the tower structure through the use of Lagrange’s Equations. Standard IEC Aeroelastic load cases are evaluated and transient solutions developed using the Modal Superposition Method and Runge-Kutta 4th order numerical integration. Validation is performed through comparisons to theoretical closed form solutions, physical laboratory test results, and peer studies. Finally a case study is performed by using the tool to simulate the Cal Poly Wind Power Research Center Wind Turbine and Tower System. Included in the case study is an optimization for hypothetical guy-wire placement to minimize tower stresses and maximize the tower’s natural frequency.

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Livres sur le sujet "Dynamic stress analysis"

Patnaik, Surya N. Dynamic analysis with stress mode animation by the integrated force method. [Washington, D.C.] : National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1997.

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Harris, David W. Dynamic effective stress finite element analysis of dams subjected to liquefaction. Denver, Colo : Embankment Dams Branch, Division of Dam and Waterway Design, Engineering and Research Center, U.S. Dept. of the Interior, Bureau of Reclamation, 1986.

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P, Norton M. The prediction of dynamic stress in structures due to air- and structure-borne sound and vibration. East Perth, WA : The Institute, 1996.

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McGowan, David Michael. Development of curved-plate elements for the exact buckling analysis of composite plate assemblies including transverse-shear effects. [Washington, D.C : National Aeronautics and Space Administration, 1997.

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F, Doyle James. Frequency domain analysis of the random loading of cracked panels. Hampton, Va : National Aeronautics and Space Administration, Langley Research Center, 1994.

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Freed, Alan David. Model development in viscoplastic ratchetting. [Washington, D.C : National Aeronautics and Space Administration, 1990.

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Xin-Qun, Zhu, dir. Moving loads : Dynamic analysis and identification techniques. London : CRC Press, 2011.

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Naik, Rajiv A. Closed-form analysis of fiber-matrix interface stresses under thermo-mechanical loadings. Hampton, Va : National Aeronautics and Space Administration, Langley Research Center, 1992.

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Chapitres de livres sur le sujet "Dynamic stress analysis"

Sugiura, Masakatsu, et Masaichiro Seika. « Dynamic Stress Analysis of a Three-Dimensional Solid Body (Dynamic Stress Concentration Factor around a Cavity) ». Dans Applied Stress Analysis, 336–45. Dordrecht : Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0779-9_33.

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Wells, P. E. « Dynamic Stress Analysis of a Cracked Rolling Mill Housing ». Dans Applied Stress Analysis, 14–25. Dordrecht : Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0779-9_2.

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Kawata, Kozo. « Dynamic Behaviour of Solids Clarified by High Speed Photoelasticity ». Dans Applied Stress Analysis, 326–35. Dordrecht : Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0779-9_32.

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Rossmanith, H. P., R. E. Knasmillner et A. Shukla. « Experimental Investigation of Dynamic Contact Problems by Means of the Method of Caustics ». Dans Experimental Stress Analysis, 407–16. Dordrecht : Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4416-9_45.

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Shukla, A., et R. Chona. « Determination of Dynamic Mode I and Mode II Fracture Mechanics Parameters From Photoelastic Data ». Dans Experimental Stress Analysis, 245–54. Dordrecht : Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4416-9_28.

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Dev, Rahul, K. Gupta et S. P. Singh. « Stress and Dynamic Analysis of Rotating Composite Disc ». Dans Springer Proceedings in Physics, 573–79. Dordrecht : Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-2069-5_77.

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Hu, Biyu, Sanichiro Yoshida et John Gaffney. « Stress and strain analysis of metal plates with holes ». Dans Dynamic Behavior of Materials, Volume 1, 187–93. New York, NY : Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-8228-5_27.

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Arroyo, Marcos, Cristiana Ferreira et Jiraroth Sukolrat. « Dynamic Measurements and Porosity in Saturated Triaxial Specimens ». Dans Soil Stress-Strain Behavior : Measurement, Modeling and Analysis, 537–46. Dordrecht : Springer Netherlands, 2007. http://dx.doi.org/10.1007/978-1-4020-6146-2_35.

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Westwood, A. D., C. E. Murray et I. C. Noyan. « In-Situ Study of Dynamic Structural Rearrangements During Stress Relaxation ». Dans Advances in X-Ray Analysis, 243–54. Boston, MA : Springer US, 1995. http://dx.doi.org/10.1007/978-1-4615-1797-9_27.

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Akita, Koichi, Masatoshi Kuroda et Philip J. Withers. « Dynamic Analysis of Residual Stress Introduced by Laser Peening ». Dans Materials Science Forum, 135–40. Stafa : Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-414-6.135.

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Actes de conférences sur le sujet "Dynamic stress analysis"

Bream, R. G., B. C. Gasper, S. W. J. Page et B. E. Lloyd. « Operational Experiences With The 'SPATE 8000' Dynamic Stress Measurement System ». Dans Stress Analysis by Thermoelastic Techniques, sous la direction de B. C. Gasper. SPIE, 1987. http://dx.doi.org/10.1117/12.937899.

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Bream, R. G., B. C. Gasper, B. E. Lloyd et S. W. J. Page. « The SPATE 8000 Thermo-Elastic Camera For Dynamic Stress Measurement On Nuclear Plant Components ». Dans Stress Analysis by Thermoelastic Techniques, sous la direction de B. C. Gasper. SPIE, 1987. http://dx.doi.org/10.1117/12.937894.

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Beghi, M. G., C. E. Bottani, G. Caglioti et A. Fazzi. « A Spectral Analyzer for the Thermoelastic and Thermoplastic Response of Solids to Low Frequency Dynamic Loads ». Dans Stress Analysis by Thermoelastic Techniques, sous la direction de B. C. Gasper. SPIE, 1987. http://dx.doi.org/10.1117/12.937887.

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Zhaocai, Du, et Yu Yueqing. « Dynamic Stress Analysis of Flexible Planar Robots ». Dans 2006 International Conference on Mechatronics and Automation. IEEE, 2006. http://dx.doi.org/10.1109/icma.2006.257794.

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Trivailo, Pavel M., Ludmilla A. Plotnikova, Trenton G. Gilbert et Paul Williams. « Dynamic Stress Analysis of Variable Geometry Teles... » Dans 56th International Astronautical Congress of the International Astronautical Federation, the International Academy of Astronautics, and the International Institute of Space Law. Reston, Virigina : American Institute of Aeronautics and Astronautics, 2005. http://dx.doi.org/10.2514/6.iac-05-c1.4.08.

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Ohta, Masayoshi, Hiroaki Nimura et Yasuyuki Hagino. « Dynamic Bending Stress Analysis of Power Train ». Dans SAE 2004 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States : SAE International, 2004. http://dx.doi.org/10.4271/2004-01-0865.

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Tian Lv et Yidu Zhang. « Dynamic stress analysis for vibratory stress relief through the vibration platform ». Dans 2014 IEEE Workshop on Electronics, Computer and Applications (IWECA). IEEE, 2014. http://dx.doi.org/10.1109/iweca.2014.6845682.

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Huang, Liping. « Analysis of Dynamic Stress Responses in Structural Vibration ». Dans ASME 1997 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/detc97/vib-4238.

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Abstract This paper describes basic concepts and finite element method of dynamic stress response analysis. It provides basics of stress modal analysis and frequency response analysis. The paper defines concepts of normal mode stresses and complex stress frequency response functions for shell elements and shows that element stress responses in both time and frequency domains can be expressed as superposition of normal mode stresses. It demonstrates that element stress response solutions have the similar forms to those of node displacement responses and that normal mode stresses in stress analysis play the same role as mode shapes in normal vibration analysis.

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Montazersadgh, Farzin H., et Ali Fatemi. « Dynamic Load and Stress Analysis of a Crankshaft ». Dans SAE World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States : SAE International, 2007. http://dx.doi.org/10.4271/2007-01-0258.

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Yang, Xianqing, Zhihong Jia et Yuemin Zhang. « Dynamic stress analysis of automatic weapons breech mechanism ». Dans 2011 International Conference on Mechatronic Science, Electric Engineering and Computer (MEC). IEEE, 2011. http://dx.doi.org/10.1109/mec.2011.6025699.

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Rapports d'organisations sur le sujet "Dynamic stress analysis"

Matheu, Enrique E., Robert L. Hall et Raju V. Kala. Folsom Dam Outlet Works Modification Project : Dynamic Stress Analysis of Overflow and Nonoverflow Sections. Fort Belvoir, VA : Defense Technical Information Center, septembre 2004. http://dx.doi.org/10.21236/ada427798.

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Smith, G., S. Baker et C. Toprakcioglu. Analysis of structure and orientation of adsorbed polymers in solution subject to a dynamic shear stress. Office of Scientific and Technical Information (OSTI), septembre 1996. http://dx.doi.org/10.2172/393328.

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Salveson, M. W. Painter Street Overcrossing : Linear-elastic finite element dynamic analysis. Office of Scientific and Technical Information (OSTI), août 1991. http://dx.doi.org/10.2172/5123335.

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Heymsfield, Ernie, et Jeb Tingle. State of the practice in pavement structural design/analysis codes relevant to airfield pavement design. Engineer Research and Development Center (U.S.), mai 2021. http://dx.doi.org/10.21079/11681/40542.

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An airfield pavement structure is designed to support aircraft live loads for a specified pavement design life. Computer codes are available to assist the engineer in designing an airfield pavement structure. Pavement structural design is generally a function of five criteria: the pavement structural configuration, materials, the applied loading, ambient conditions, and how pavement failure is defined. The two typical types of pavement structures, rigid and flexible, provide load support in fundamentally different ways and develop different stress distributions at the pavement – base interface. Airfield pavement structural design is unique due to the large concentrated dynamic loads that a pavement structure endures to support aircraft movements. Aircraft live loads that accompany aircraft movements are characterized in terms of the load magnitude, load area (tire-pavement contact surface), aircraft speed, movement frequency, landing gear configuration, and wheel coverage. The typical methods used for pavement structural design can be categorized into three approaches: empirical methods, analytical (closed-form) solutions, and numerical (finite element analysis) approaches. This article examines computational approaches used for airfield pavement structural design to summarize the state-of-the-practice and to identify opportunities for future advancements. United States and non-U.S. airfield pavement structural codes are reviewed in this article considering their computational methodology and intrinsic qualities.

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Han, Keesook, Tao Zhang et Qi Liao. Data Stream Mining Based Dynamic Link Anomaly Analysis Using Paired Sliding Time Window Data. Fort Belvoir, VA : Defense Technical Information Center, novembre 2014. http://dx.doi.org/10.21236/ada613504.

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Menefee, Maia Catherine, et Michael W. Salmon. Allowable Stresses For Use in Dynamic Analysis of PF-4 Fire Suppression System Piping. Office of Scientific and Technical Information (OSTI), mai 2017. http://dx.doi.org/10.2172/1360690.

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Amela, R., R. Badia, S. Böhm, R. Tosi, C. Soriano et R. Rossi. D4.2 Profiling report of the partner’s tools, complete with performance suggestions. Scipedia, 2021. http://dx.doi.org/10.23967/exaqute.2021.2.023.

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This deliverable focuses on the proling activities developed in the project with the partner's applications. To perform this proling activities, a couple of benchmarks were dened in collaboration with WP5. The rst benchmark is an embarrassingly parallel benchmark that performs a read and then multiple writes of the same object, with the objective of stressing the memory and storage systems and evaluate the overhead when these reads and writes are performed in parallel. A second benchmark is dened based on the Continuation Multi Level Monte Carlo (C-MLMC) algorithm. While this algorithm is normally executed using multiple levels, for the proling and performance analysis objectives, the execution of a single level was enough since the forthcoming levels have similar performance characteristics. Additionally, while the simulation tasks can be executed as parallel (multi-threaded tasks), in the benchmark, single threaded tasks were executed to increase the number of simulations to be scheduled and stress the scheduling engines. A set of experiments based on these two benchmarks have been executed in the MareNostrum 4 supercomputer and using PyCOMPSs as underlying programming model and dynamic scheduler of the tasks involved in the executions. While the rst benchmark was executed several times in a single iteration, the second benchmark was executed in an iterative manner, with cycles of 1) Execution and trace generation; 2) Performance analysis; 3) Improvements. This had enabled to perform several improvements in the benchmark and in the scheduler of PyCOMPSs. The initial iterations focused on the C-MLMC structure itself, performing re-factors of the code to remove ne grain and sequential tasks and merging them in larger granularity tasks. The next iterations focused on improving the PyCOMPSs scheduler, removing existent bottlenecks and increasing its performance by making the scheduler a multithreaded engine. While the results can still be improved, we are satised with the results since the granularity of the simulations run in this evaluation step are much ner than the one that will be used for the real scenarios. The deliverable nishes with some recommendations that should be followed along the project in order to obtain good performance in the execution of the project codes.

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Financial Stability Report - September 2015. Banco de la República, août 2021. http://dx.doi.org/10.32468/rept-estab-fin.sem2.eng-2015.

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From this edition, the Financial Stability Report will have fewer pages with some changes in its structure. The purpose of this change is to present the most relevant facts of the financial system and their implications on the financial stability. This allows displaying the analysis more concisely and clearly, as it will focus on describing the evolution of the variables that have the greatest impact on the performance of the financial system, for estimating then the effect of a possible materialization of these risks on the financial health of the institutions. The changing dynamics of the risks faced by the financial system implies that the content of the Report adopts this new structure; therefore, some analyses and series that were regularly included will not necessarily be in each issue. However, the statistical annex that accompanies the publication of the Report will continue to present the series that were traditionally included, regardless of whether or not they are part of the content of the Report. In this way we expect to contribute in a more comprehensive way to the study and analysis of the stability of the Colombian financial system. Executive Summary During the first half of 2015, the main advanced economies showed a slow recovery on their growth, while emerging economies continued with their slowdown trend. Domestic demand in the United States allowed for stabilization on its average growth for the first half of the year, while other developed economies such as the United Kingdom, the euro zone, and Japan showed a more gradual recovery. On the other hand, the Chinese economy exhibited the lowest growth rate in five years, which has resulted in lower global dynamism. This has led to a fall in prices of the main export goods of some Latin American economies, especially oil, whose price has also responded to a larger global supply. The decrease in the terms of trade of the Latin American economies has had an impact on national income, domestic demand, and growth. This scenario has been reflected in increases in sovereign risk spreads, devaluations of stock indices, and depreciation of the exchange rates of most countries in the region. For Colombia, the fall in oil prices has also led to a decline in the terms of trade, resulting in pressure on the dynamics of national income. Additionally, the lower demand for exports helped to widen the current account deficit. This affected the prospects and economic growth of the country during the first half of 2015. This economic context could have an impact on the payment capacity of debtors and on the valuation of investments, affecting the soundness of the financial system. However, the results of the analysis featured in this edition of the Report show that, facing an adverse scenario, the vulnerability of the financial system in terms of solvency and liquidity is low. The analysis of the current situation of credit institutions (CI) shows that growth of the gross loan portfolio remained relatively stable, as well as the loan portfolio quality indicators, except for microcredit, which showed a decrease in these indicators. Regarding liabilities, traditional sources of funding have lost market share versus non-traditional ones (bonds, money market operations and in the interbank market), but still represent more than 70%. Moreover, the solvency indicator remained relatively stable. As for non-banking financial institutions (NBFI), the slowdown observed during the first six months of 2015 in the real annual growth of the assets total, both in the proprietary and third party position, stands out. The analysis of the main debtors of the financial system shows that indebtedness of the private corporate sector has increased in the last year, mostly driven by an increase in the debt balance with domestic and foreign financial institutions. However, the increase in this latter source of funding has been influenced by the depreciation of the Colombian peso vis-à-vis the US dollar since mid-2014. The financial indicators reflected a favorable behavior with respect to the historical average, except for the profitability indicators; although they were below the average, they have shown improvement in the last year. By economic sector, it is noted that the firms focused on farming, mining and transportation activities recorded the highest levels of risk perception by credit institutions, and the largest increases in default levels with respect to those observed in December 2014. Meanwhile, households have shown an increase in the financial burden, mainly due to growth in the consumer loan portfolio, in which the modalities of credit card, payroll deductible loan, revolving and vehicle loan are those that have reported greater increases in risk indicators. On the side of investments that could be affected by the devaluation in the portfolio of credit institutions and non-banking financial institutions (NBFI), the largest share of public debt securities, variable-yield securities and domestic private debt securities is highlighted. The value of these portfolios fell between February and August 2015, driven by the devaluation in the market of these investments throughout the year. Furthermore, the analysis of the liquidity risk indicator (LRI) shows that all intermediaries showed adequate levels and exhibit a stable behavior. Likewise, the fragility analysis of the financial system associated with the increase in the use of non-traditional funding sources does not evidence a greater exposure to liquidity risk. Stress tests assess the impact of the possible joint materialization of credit and market risks, and reveal that neither the aggregate solvency indicator, nor the liquidity risk indicator (LRI) of the system would be below the established legal limits. The entities that result more individually affected have a low share in the total assets of the credit institutions; therefore, a risk to the financial system as a whole is not observed. José Darío Uribe Governor

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