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Relevant bibliographies by topics / Dynamic properties of materials

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Academic literature on the topic 'Dynamic properties of materials'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 May 2022

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Journal articles on the topic "Dynamic properties of materials"

1

Li, W. H., G. Chen, S. H. Yeo, and Hao Du. "Dynamic Properties of Magnetorheological Materials." Key Engineering Materials 227 (August 2002): 119–24. http://dx.doi.org/10.4028/www.scientific.net/kem.227.119.

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IISAKA, KATSUYOSHI. "Dynamic mechanical properties of composite materials." NIPPON GOMU KYOKAISHI 60, no. 3 (1987): 117–25. http://dx.doi.org/10.2324/gomu.60.117.

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Marlor, S. S., I. Miskioglu, and J. Ligon. "DYNAMIC MATERIAL PROPERTIES IN BIREFRINGENT MATERIALS." Experimental Techniques 18, no. 4 (July 1994): 39–42. http://dx.doi.org/10.1111/j.1747-1567.1994.tb00288.x.

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Cascone, Maria Grazia. "Dynamic-Mechanical Properties of Bioartificial Polymeric Materials." Polymer International 43, no. 1 (May 1997): 55–69. http://dx.doi.org/10.1002/(sici)1097-0126(199705)43:1<55::aid-pi762>3.0.co;2-#.

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Kulik, V. M., B. N. Semenov, and S. L. Morozova. "Measurement of dynamic properties of viscoelastic materials." Thermophysics and Aeromechanics 14, no. 2 (June 2007): 211–21. http://dx.doi.org/10.1134/s0869864307020072.

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Kulik, V. M., B. N. Semenov, A. V. Boiko, B. M. Seoudi, H. H. Chun, and I. Lee. "Measurement of Dynamic Properties of Viscoelastic Materials." Experimental Mechanics 49, no. 3 (August 2, 2008): 417–25. http://dx.doi.org/10.1007/s11340-008-9165-x.

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Ito, Hiroshi, and Hideo Komine. "Dynamic compaction properties of bentonite-based materials." Engineering Geology 98, no. 3-4 (May 2008): 133–43. http://dx.doi.org/10.1016/j.enggeo.2008.01.005.

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Ivanchuk, A. A., D. M. Karpinos, Yu V. Kondrat'ev, Yu I. Nezhentsev, A. E. Rutkovskii, V. Ya Bikernieks, O. O. Peterson, and V. A. Pekhovich. "Dynamic strength properties of permeable fibrous materials." Soviet Powder Metallurgy and Metal Ceramics 25, no. 6 (June 1986): 522–26. http://dx.doi.org/10.1007/bf00792395.

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Lurie, K. A. "MATERIAL OPTIMIZATION AND DYNAMIC MATERIALS." Cybernetics and Physics, Volume 10, 2021, Number 2 (October 1, 2021): 84–87. http://dx.doi.org/10.35470/2226-4116-2021-10-2-84-87.

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The paper is about the connection between material optimization in dynamics and a novel concept of dynamic materials (DM) defined as inseparable union of a framework and the fluxes of mass, momentum, and energy existing in time dependent material formations. An example of a spatial-temporal material geometry is discussed as illustration of a DM capable of accumulating wave energy. Finding the optimal material layouts in dynamics demonstrates conceptual difference from a similar procedure in statics. In the first case, the original constituents are distributed in space-time, whereas in the second - in space alone. The habitual understanding of a material as an isolated framework has come from statics, but a transition to dynamics brings in a new component - the fluxes of mass, momentum, and energy. Based on Noether theorem, these fluxes connect the framework with the environment into inseparable entity termed dynamic material (DM). The key role of DM is that they support controls that may purposefully change the material properties in both space and time, which is the main goal of optimization.

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He, W., T. Xing, G. X. Liao, W. Lin, F. Deng, and X. G. Jian. "Dynamic Mechanical Properties of PPESK/Silica Hybrid Materials." Polymer-Plastics Technology and Engineering 48, no. 2 (February 2, 2009): 164–69. http://dx.doi.org/10.1080/03602550802577379.

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Dissertations / Theses on the topic "Dynamic properties of materials"

1

Perera, M. Mario. "Dynamic Soft Materials with Controllable Mechanical Properties." University of Cincinnati / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1595847753887897.

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Cope, Elizabeth Ruth. "Dynamic properties of materials : phonons from neutron scattering." Thesis, University of Cambridge, 2010. https://www.repository.cam.ac.uk/handle/1810/226116.

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A detailed understanding of fundamental material properties can be obtained through the study of atomic vibrations, performed experimentally with neutron scattering techniques and coupled with the two powerful new computational methodologies I have developed. The first approach involves phonon-based simulations of the pair distribution function - a histogram of localised atomic positions generated experimentally from total scattering data. This is used to reveal ordering behaviour, to validate interatomic models and localised structure, and to give insights into how far dynamic behaviour can be studied using total scattering techniques. Most importantly, the long-standing controversy over dynamic disorder in β-cristobalite is resolved using this technique. Inelastic neutron spectroscopy (INS) allows \emph{direct} study of vibrational modes through their interaction with the neutron beam, and is the experimental basis for the second strand of the new methodology. I have developed new simulation and refinement tools based on the next generation of spectrometers currently being commissioned at the ISIS pulsed neutron source. This allows a detailed powder spectroscopy study of cristobalite and vitreous silica demonstrating that the Bose peak and so-called 'fast sound' features can be derived from standard lattice dynamics in both the crystal and the amorphous counterpart, and allowing discussion of their origins. Given the controversy in the literature, this is a key result. The new methodology also encompasses refinement of interatomic models against powder INS data, with aluminium providing a successful test-case. A more complex example is seen in calcite, with experimental data collected during the commissioning of the new MERLIN spectrometer. Simulated one-phonon coherent INS spectra for the single crystal and powder (the latter including approximations to multi-phonon and multiple scatter) are fully convolved with experimental resolution functions. These are used in the analysis of the experimental data, yielding previously unpublished dispersion curves and soft mode information, as well as allowing the effectiveness of powder refinement of more complex materials to be assessed. Finally, I present further applications with technologically important materials - relaxor ferroelectrics and high temperature pnictide superconductors. The conclusions draw together the different strands of the work, discussing the importance of these new advances together with future developments and scientific applications.

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Wu, Lei. "The dynamic properties of voided polymers." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/16968.

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Biesel, Van Brian. "Experimental measurement of the dynamic properties of viscoelastic materials." Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/19249.

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Yu, Zhaohui Crocker Malcolm J. "Static, dynamic and acoustical properties of sandwich composite materials." Auburn, Ala., 2007. http://repo.lib.auburn.edu/2006%20Fall/Dissertations/YU_ZHAOHUI_54.pdf.

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Margiolaki, Irene. "Structural, magnetic and dynamic properties of fullerene based materials." Thesis, University of Sussex, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288785.

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Gu, Xiaoqiang, and 顾晓强. "Dynamic properties of granular materials at the macro and microscales." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B47752622.

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Dynamic properties of soil, including modulus and damping, play essential roles in evaluating the response of the soil deposit and its supporting structures when subjected to dynamic loads induced by earthquakes, traffic, explosions, machine foundations, and so on. It is well recognized that the dynamic properties of soil are affected by many factors, such as strain amplitude, stress condition, void ratio, saturation and gradation. Despite tremendous works have been done, the macroscopic effects of several key factors on the dynamic properties of granular material are not yet fully understood, due primarily to its particulate and multiphase nature. Furthermore, the understanding of how the influencing factors affect the dynamic properties of granular material or the underlying fundamental mechanism is inadequate. This study thus is carried out to investigate the effects and the underlying mechanisms of these important factors, including strain amplitude, stress condition, void ratio, particle size, saturation, and initial fabric, by means of advanced laboratory tests and numerical simulations. To study the dynamic properties at the macro scale, a series of laboratory tests are carried out in a state-of-art resonant column (RC) apparatus incorporating bender element (BE) and torsional shear (TS). Test materials include artificial glass beads with different sizes, commercially available standard sands and natural completely decomposed granite (CDG). The specimens are prepared at various densities, confined at different pressures, tested both in dry and saturated conditions, and reconstituted by different preparation methods. In particular, the characteristics of wave signals (both S-wave and P-wave) at various conditions and the associated interpretation methods in BE tests are investigated in detail. The results obtained from BE, RC and TS are compared to clarify the potential effect of test method. Moreover, attempts are made to explain the test results from the viewpoint of micromechanics. Numerical simulations using discrete element method (DEM) are performed to study the dynamic properties of granular materials and explore the underlying fundamental mechanism at the micro scale. The simulations indicate that the elastic properties are closely related to the coordination number and the distribution of normal contact forces in the specimen. The effects of initial fabric and induced fabric, which are respectively achieved by different specimen generation methods and the application of anisotropic stress states, are investigated. The anisotropy of the specimen and its evolution during shearing are also studied. The results indicate that the anisotropy is resulted from the spatial distributions of contact force and contact number. The modulus reduction curve and damping curve obtained from the simulations are compared with those from laboratory tests.
published_or_final_version
Civil Engineering
Doctoral
Doctor of Philosophy

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Tan, Aik Jun. "Dynamic modulation of material properties by solid state proton gating." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/122082.

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This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2019
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 195-215).
As functionalities become more abundant in solid state devices, one key capability which remains lacking is an effective means to dynamically tune material properties. In this thesis, we establish a pathway towards this capability by utilizing the simplest ion known to mankind: the proton. We demonstrate for the first time dynamic control of magnetic properties in an all-solid-state heterostructures using solid state proton gating in a metal/oxide heterostructure. We also demonstrate dynamic modulation of magnetic anisotropy at a metal-metal interface through hydrogen insertion in a heavy metal adjacent to a ferromagnet. Besides magnetic properties, solid state proton gating also enables dynamic modulation of optical properties in a thin film oxide. We observe fast gating of optical reflectivity by ~10% at timescale down to ~20ms in a metal/oxide/metal heterostructure. Finally, we also demonstrate a room temperature reversible solid oxide fuel cell based on hydrogen storage. The cell has a small form factor which is suitable for energy storage in solid state microelectronics application. Our work hence provides a platform for complete control of material properties through solid state proton gating.
by Aik Jun Tan.
Ph. D.
Ph.D. Massachusetts Institute of Technology, Department of Materials Science and Engineering

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Clark, Justin Lewis. "Dynamic and Quasi-Static Mechanical Properties of Fe-Ni Alloy Honeycomb." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5223.

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Several metal honeycombs, termed Linear Cellular Alloys (LCAs), were fabricated via a paste extrusion process and thermal treatment. Two Fe-Ni based alloy compositions were evaluated. Maraging steel and Super Invar were chosen for their compatibility with the process and the wide range of properties they afforded. Cell wall material was characterized and compared to wrought alloy specifications. The bulk alloy was found to compare well with the more conventionally produced wrought product when porosity was taken into account. The presence of extrusion defects and raw material impurities were shown to degrade properties with respect to wrought alloys. The performance of LCAs was investigated for several alloys and cell morphologies. The results showed that out-of-plane properties exceeded model predictions and in-plane properties fell short due to missing cell walls and similar defects. Strength was shown to outperform several existing cellular metals by as much as an order of magnitude in some instances. Energy absorption of these materials was shown to exceed 150 J/cc at strains of 50% for high strength alloys. Finally, the suitability of LCAs as an energetic capsule was investigated. The investigation found that the LCAs added significant static strength and as much as three to five times improvement in the dynamic strength of the system. More importantly, it was shown that the pressures achieved with the LCA capsule were significantly higher than the energetic material could achieve alone. High pressures, approaching 3 GPa, coupled with the fragmentation of the capsule during impact increased the likelihood of initiation and propagation of the energetic reaction. This multi-functional aspect of the LCA makes it a suitable capsule material.

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Henry, Christopher P. (Christopher Paul) 1974. "Dynamic actuation properties of Ni-Mn-Ga ferromagnetic shape memory alloys." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/8442.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2002.
Includes bibliographical references (leaves 198-201).
Dynamic magnetic-field-induced strain actuation of up to 3% with a frequency bandwidth of least 500 Hz in Ni48.5Mn29.5Ga21 ferromagnetic shape memory alloys (FMSAs) is achieved. Hardware was designed and constructed to measure frequency bandwidth, magnetic-field-induced strain, stress and magnetization driven from an applied magnetic field. The bandwidth in this investigation was only limited by inductive reactance of the hardware, not by fundamental limitations of Ni-Mn-Ga. Degradation of the peak dynamic actuation strain occurred from 3.0% to 2.6% with increasing number of cycles from Nz1,000 to N 100,000. Measurement of strain, stress, and magnetization driven by a magnetic field permitted the comparison of measured properties versus properly defined thermodynamic properties. The peak thermodynamic piezomagnetic coefficient is d3, 1,= 2.5 x 10-7m / A compared to the experimental slope, dE/dH, of 1.0 x 10-7 m / A at N-1,000 cycles and 1.4 x 10-7 m / A at N-100,000 cycles, respectively. The thermodynamic piezomagnetic coefficient is five times greater than Terfenol-D with d31 = 5.0 x 10-m / A. The magnetic susceptibility varies between 3-10, while the twinning stiffness varies between 30-40 MPa within the average bias stress range of 0.3 to 2.8 MPa. At optimum fields and bias stresses, the mechanical energy density during cyclic deformation was 65 kJ/m3 at the expense of 20 kJ/m3 lost An important first observation of dynamic stress vs. field behavior is understood by an extension of a magnetomechanical phenomenological model.
(cont.) The mechanism of stress generation is thought to be magnetization rotation causing negative magnetostriction with quadratic magnetic-field dependence before twin boundaries move. Above the threshold field for twin boundary motion, stress increases in proportion to the magnetic-field-induced strain. Dynamic actuation measurements performed here help put Ni-Mn-Ga FSMAs into perspective with other active materials performance: Ni-Mn-Ga FSMAs are between low bandwidth, high strain, Nitinol and high bandwidth, low strain Terfenol-D and ferroelectrics.
by Christopher P. Henry.
Ph.D.

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Books on the topic "Dynamic properties of materials"

1

Dynamic behavior of materials. New York: Wiley, 1994.

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Menard, Kevin P. Dynamic Mechanical Analysis. London: Taylor and Francis, 2008.

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Dynamic mechanical analysis: A practical introduction. Boca Raton, FL: CRC Press, 2008.

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Zhernokletov, Mikhail V., and Boris L. Glushak, eds. Material Properties under Intensive Dynamic Loading. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/978-3-540-36845-8.

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International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading (6th 2000 Kraków, Poland). 6th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading: Proceedings, September25-29, 2000, Kraków, Poland : DYMAY 2000 = 6e Congrès international sur le comportement mécanique et physique des matériaux sous sollicitations dynamiques. Les Ulis, France: Éditions de physique, 2000.

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International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading (8th 2006 Dijon, France). 8th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading: 8e Conférence internationale sur le comportement mécanique et physique des matériaux sous sollicitation dynamique : proceedings : DYMAT 2006 : Dijon, France, 11-15 September, 2006. Les Ulis, France: Éditions de physique, 2006.

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International, Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading (7th 2003 Porto Portugal). 7th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading =: 7e Congrès international sur le comportement mécanique et physique des matériaux sous sollicitations dynamiques : September 8-12, 2003, Porto, Portugal. Les Ulis, France: EDP Sciences, 2003.

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International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading (6th 2000 Kraków, Poland). 6th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading =: 6e Congrès International sur le comportement mécanique et physique des matériaux sous sollicitations dynamiques : September 25-29, 2000, Kraków, Poland. Les Ulis Cedex A, France: EDP Sciences, 2000.

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Lidström, Erik. Static and dynamic properties of rare earth compounds. Uppsala: Acta Universitatis Upsaliensis, 1995.

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1970-, Case Scott W., ed. Damage tolerance and durability of material systems. New York: Wiley Interscience, 2002.

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Book chapters on the topic "Dynamic properties of materials"

1

Glushak, B. L., O. A. Tyupanova, and Yu V. Batkov. "Dynamic Strength of Materials." In Material Properties under Intensive Dynamic Loading, 221–75. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/978-3-540-36845-8_6.

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Bian, Xiangde, Fuping Yuan, Xiaolei Wu, and Yuntian Zhu. "Gradient Structure Produces Superior Dynamic Shear Properties." In Heterostructured Materials, 311–22. New York: Jenny Stanford Publishing, 2021. http://dx.doi.org/10.1201/9781003153078-21.

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Hsu, P. H., Sheng-Yu Huang, C. C. Chiang, L. Tsai, S. H. Wang, and N. S. Liou. "Dynamic Friction Properties of Stainless Steels." In Dynamic Behavior of Materials, Volume 1, 149–54. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-22452-7_21.

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Fischer, Christian, Mathieu Fauve, Etienne Combaz, Pierre-Etienne Bourban, Véronique Michaud, Christopher J. G. Plummer, Hansueli Rhyner, and Jan-Anders E. Månson. "Dynamic Properties of Materials for Alpine Skis." In The Engineering of Sport 6, 263–68. New York, NY: Springer New York, 2006. http://dx.doi.org/10.1007/978-0-387-46050-5_47.

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Qi, Yujie, Buddhima Indraratna, and Jayan S. Vinod. "Dynamic Properties of Mixtures of Waste Materials." In Proceedings of GeoShanghai 2018 International Conference: Advances in Soil Dynamics and Foundation Engineering, 308–17. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0131-5_34.

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Amirkhizi, A. V., J. Qiao, K. Schaaf, and S. Nemat-Nasser. "Properties of Elastomer-based Particulate Composites." In Dynamic Behavior of Materials, Volume 1, 69–72. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-8228-5_10.

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Wu, Gao Hui, Jian Gu, Qiang Zhang, and Xiao Zhao. "Fabrication and Dynamic Mechanical Properties Offly Ash/Epoxy Composites." In Key Engineering Materials, 1467–70. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-456-1.1467.

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Schanz, Martin, Georgios E. Stavroulakis, and Steffen Alvermann. "Effective Dynamic Material Properties for Materials with Non-Convex Microstructures." In Composites with Micro- and Nano-Structure, 47–65. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6975-8_4.

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Hokka, Mikko, Jari Kokkonen, Jeremy Seidt, Thomas Matrka, Amos Gilat, and Veli-Tapani Kuokkala. "Dynamic Torsion Properties of Ultrafine Grained Aluminum." In Dynamic Behavior of Materials, Volume 1, 303–10. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-8228-5_43.

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Yeh, Meng Kao, and Tsung Han Hsieh. "Dynamic Properties of MWNTS/Epoxy Nanocomposite Beams." In Advances in Composite Materials and Structures, 709–12. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-427-8.709.

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Conference papers on the topic "Dynamic properties of materials"

1

Srivastava, Ankit, and Sia Nemat-Nasser. "Effective Dynamic Properties of Microstructured Heterogeneous Materials." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-88517.

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Central to the idea of metamaterials is the concept of dynamic homogenization which seeks to define frequency dependent effective properties for Bloch wave propagation. While the theory of static effective property calculations goes back about 60 years, progress in the actual calculation of dynamic effective properties for periodic composites has been made only very recently. Here we discuss the explicit form of the effective dynamic constitutive equations. We elaborate upon the existence and emergence of coupling in the dynamic constitutive relation and further symmetries of the effective tensors.

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Andrianov, Igor V., Vladyslav V. Danishevs’kyy, Heiko Topol, Dieter Weichert, Theodore E. Simos, George Psihoyios, and Ch Tsitouras. "Nonlinear Dynamic Properties of Layered Composite Materials." In ICNAAM 2010: International Conference of Numerical Analysis and Applied Mathematics 2010. AIP, 2010. http://dx.doi.org/10.1063/1.3498612.

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Li, D. Z., and Z. C. Feng. "Dynamic properties of pseudoelastic shape memory alloys." In Smart Structures and Materials '97, edited by Mark E. Regelbrugge. SPIE, 1997. http://dx.doi.org/10.1117/12.275696.

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Sato, Wataru, Keisuke Sueki, Koichi Kikuchi, Shinzo Suzuki, Yohji Achiba, Hiromichi Nakahara, Yoshitaka Ohkubo, Kichizo Asai, and Fumitoshi Ambe. "Dynamic Motion of." In ELECTRONIC PROPERTIES OF NOVEL MATERIALS--SCIENCE AND TECHNOLOGY OF MOLECULAR NANOSTRUCTURES. ASCE, 1999. http://dx.doi.org/10.1063/1.59767.

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Najidha, S., P. Predeep, N. S. Saxena, P. Predeep, S. Prasanth, and A. S. Prasad. "Dynamic Mechanical Properties of Natural Rubber∕Polyaniline Composites." In THERMOPHYSICAL PROPERTIES OF MATERIALS AND DEVICES: IVth National Conference on Thermophysical Properties - NCTP'07. AIP, 2008. http://dx.doi.org/10.1063/1.2927564.

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Oyadiji, S. Olutunde, and Lip W. Chu. "Time domain characterization of the dynamic properties of viscoelastic materials." In Smart Structures and Materials '97, edited by L. Porter Davis. SPIE, 1997. http://dx.doi.org/10.1117/12.274202.

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Zhou, G. Y., and Q. Wang. "Field-dependent dynamic properties of magnetorheological elastomer-based sandwich beams." In Smart Structures and Materials, edited by Kon-Well Wang. SPIE, 2005. http://dx.doi.org/10.1117/12.598422.

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Hurtado, P. I., P. Chaudhuri, L. Berthier, W. Kob, Joaquín Marro, Pedro L. Garrido, and Pablo I. Hurtado. "Static and dynamic properties of a reversible gel." In MODELING AND SIMULATION OF NEW MATERIALS: Proceedings of Modeling and Simulation of New Materials: Tenth Granada Lectures. AIP, 2009. http://dx.doi.org/10.1063/1.3082276.

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Tryson, Michael J., Rahimullah Sarban, and Kim P. Lorenzen. "The dynamic properties of tubular DEAP actuators." In SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, edited by Yoseph Bar-Cohen. SPIE, 2010. http://dx.doi.org/10.1117/12.847297.

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GLASS, DAVID, and KUMAR TAMMA. "Non-Fourier dynamic thermoelasticity with temperature-dependent thermal properties." In 32nd Structures, Structural Dynamics, and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1991. http://dx.doi.org/10.2514/6.1991-1174.

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Reports on the topic "Dynamic properties of materials"

1

Grady, D. E. Dynamic properties of ceramic materials. Office of Scientific and Technical Information (OSTI), February 1995. http://dx.doi.org/10.2172/72964.

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Grady, D. E., and J. L. Wise. Dynamic properties of ceramic materials. Office of Scientific and Technical Information (OSTI), September 1993. http://dx.doi.org/10.2172/10187138.

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Sorrell, F. Y., and T. Kuo. Dynamic Material Properties of Moist Sand. Fort Belvoir, VA: Defense Technical Information Center, March 1992. http://dx.doi.org/10.21236/ada260791.

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Johnson, J. N. Shock compression science: Dynamic material properties and computation. Office of Scientific and Technical Information (OSTI), October 1996. http://dx.doi.org/10.2172/380326.

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Castleman, A. W., and Jr. DURIP 99 - Ultrafast Laser Dynamics: Exploring the Formation and Properties of Cluster Materials. Fort Belvoir, VA: Defense Technical Information Center, January 2000. http://dx.doi.org/10.21236/ada383086.

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Subramanian, K. H. Test Plan to Update SRS High Level Waste Tank Material Properties Database by Determining Synergistic Effects of Dynamic Strain Aging and Stress Corrosion Cracking. Office of Scientific and Technical Information (OSTI), March 2002. http://dx.doi.org/10.2172/799694.

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Shmulevich, Itzhak, Shrini Upadhyaya, Dror Rubinstein, Zvika Asaf, and Jeffrey P. Mitchell. Developing Simulation Tool for the Prediction of Cohesive Behavior Agricultural Materials Using Discrete Element Modeling. United States Department of Agriculture, October 2011. http://dx.doi.org/10.32747/2011.7697108.bard.

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Abstract:

The underlying similarity between soils, grains, fertilizers, concentrated animal feed, pellets, and mixtures is that they are all granular materials used in agriculture. Modeling such materials is a complex process due to the spatial variability of such media, the origin of the material (natural or biological), the nonlinearity of these materials, the contact phenomenon and flow that occur at the interface zone and between these granular materials, as well as the dynamic effect of the interaction process. The lack of a tool for studying such materials has limited the understanding of the phenomena relevant to them, which in turn has led to energy loss and poor quality products. The objective of this study was to develop a reliable prediction simulation tool for cohesive agricultural particle materials using Discrete Element Modeling (DEM). The specific objectives of this study were (1) to develop and verify a 3D cohesionless agricultural soil-tillage tool interaction model that enables the prediction of displacement and flow in the soil media, as well as forces acting on various tillage tools, using the discrete element method; (2) to develop a micro model for the DEM formulation by creating a cohesive contact model based on liquid bridge forces for various agriculture materials; (3) to extend the model to include both plastic and cohesive behavior of various materials, such as grain and soil structures (e.g., compaction level), textures (e.g., clay, loam, several grains), and moisture contents; (4) to develop a method to obtain the parameters for the cohesion contact model to represent specific materials. A DEM model was developed that can represent both plastic and cohesive behavior of soil. Soil cohesive behavior was achieved by considering tensile force between elements. The developed DEM model well represented the effect of wedge shape on soil behavior and reaction force. Laboratory test results showed that wedge penetration resistance in highly compacted soil was two times greater than that in low compacted soil, whereas DEM simulation with parameters obtained from the test of low compacted soil could not simply be extended to that of high compacted soil. The modified model took into account soil failure strength that could be changed with soil compaction. A three dimensional representation composed of normal displacement, shear failure strength and tensile failure strength was proposed to design mechanical properties between elements. The model based on the liquid bridge theory. An inter particle tension force measurement tool was developed and calibrated A comprehensive study of the parameters of the contact model for the DEM taking into account the cohesive/water-bridge was performed on various agricultural grains using this measurement tool. The modified DEM model was compared and validated against the test results. With the newly developed model and procedure for determination of DEM parameters, we could reproduce the high compacted soil behavior and reaction forces both qualitatively and quantitatively for the soil conditions and wedge shapes used in this study. Moreover, the effect of wedge shape on soil behavior and reaction force was well represented with the same parameters. During the research we made use of the commercial PFC3D to analyze soil tillage implements. An investigation was made of three different head drillers. A comparison of three commonly used soil tillage systems was completed, such as moldboard plow, disc plow and chisel plow. It can be concluded that the soil condition after plowing by the specific implement can be predicted by the DEM model. The chisel plow is the most economic tool for increasing soil porosity. The moldboard is the best tool for soil manipulation. It can be concluded that the discrete element simulation can be used as a reliable engineering tool for soil-implement interaction quantitatively and qualitatively.

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Brar, N. S., Z. Rosenberg, and S. J. Bless. Dynamic Properties of Porous B4C. Fort Belvoir, VA: Defense Technical Information Center, January 1990. http://dx.doi.org/10.21236/ada222850.

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Snyder, Victor A., Dani Or, Amos Hadas, and S. Assouline. Characterization of Post-Tillage Soil Fragmentation and Rejoining Affecting Soil Pore Space Evolution and Transport Properties. United States Department of Agriculture, April 2002. http://dx.doi.org/10.32747/2002.7580670.bard.

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Abstract:

Tillage modifies soil structure, altering conditions for plant growth and transport processes through the soil. However, the resulting loose structure is unstable and susceptible to collapse due to aggregate fragmentation during wetting and drying cycles, and coalescense of moist aggregates by internal capillary forces and external compactive stresses. Presently, limited understanding of these complex processes often leads to consideration of the soil plow layer as a static porous medium. With the purpose of filling some of this knowledge gap, the objectives of this Project were to: 1) Identify and quantify the major factors causing breakdown of primary soil fragments produced by tillage into smaller secondary fragments; 2) Identify and quantify the. physical processes involved in the coalescence of primary and secondary fragments and surfaces of weakness; 3) Measure temporal changes in pore-size distributions and hydraulic properties of reconstructed aggregate beds as a function of specified initial conditions and wetting/drying events; and 4) Construct a process-based model of post-tillage changes in soil structural and hydraulic properties of the plow layer and validate it against field experiments. A dynamic theory of capillary-driven plastic deformation of adjoining aggregates was developed, where instantaneous rate of change in geometry of aggregates and inter-aggregate pores was related to current geometry of the solid-gas-liquid system and measured soil rheological functions. The theory and supporting data showed that consolidation of aggregate beds is largely an event-driven process, restricted to a fairly narrow range of soil water contents where capillary suction is great enough to generate coalescence but where soil mechanical strength is still low enough to allow plastic deforn1ation of aggregates. The theory was also used to explain effects of transient external loading on compaction of aggregate beds. A stochastic forInalism was developed for modeling soil pore space evolution, based on the Fokker Planck equation (FPE). Analytical solutions for the FPE were developed, with parameters which can be measured empirically or related to the mechanistic aggregate deformation model. Pre-existing results from field experiments were used to illustrate how the FPE formalism can be applied to field data. Fragmentation of soil clods after tillage was observed to be an event-driven (as opposed to continuous) process that occurred only during wetting, and only as clods approached the saturation point. The major mechanism of fragmentation of large aggregates seemed to be differential soil swelling behind the wetting front. Aggregate "explosion" due to air entrapment seemed limited to small aggregates wetted simultaneously over their entire surface. Breakdown of large aggregates from 11 clay soils during successive wetting and drying cycles produced fragment size distributions which differed primarily by a scale factor l (essentially equivalent to the Van Bavel mean weight diameter), so that evolution of fragment size distributions could be modeled in terms of changes in l. For a given number of wetting and drying cycles, l decreased systematically with increasing plasticity index. When air-dry soil clods were slightly weakened by a single wetting event, and then allowed to "age" for six weeks at constant high water content, drop-shatter resistance in aged relative to non-aged clods was found to increase in proportion to plasticity index. This seemed consistent with the rheological model, which predicts faster plastic coalescence around small voids and sharp cracks (with resulting soil strengthening) in soils with low resistance to plastic yield and flow. A new theory of crack growth in "idealized" elastoplastic materials was formulated, with potential application to soil fracture phenomena. The theory was preliminarily (and successfully) tested using carbon steel, a ductile material which closely approximates ideal elastoplastic behavior, and for which the necessary fracture data existed in the literature.

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Stout, M. G., C. Liu, F. L. Addessio, T. O. Williams, J. G. Bennett, K. S. Haberman, and B. W. Asay. Dynamic fracture of heterogeneous materials. Office of Scientific and Technical Information (OSTI), December 1998. http://dx.doi.org/10.2172/334313.

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