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Relevant bibliographies by topics / Unloading stiffness degradation

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Academic literature on the topic 'Unloading stiffness degradation'

Author: Grafiati

Published: 4 June 2021

Last updated: 11 February 2022

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Journal articles on the topic "Unloading stiffness degradation"

1

Lin, Huang-bin, Shou-gao Tang, and Cheng Lan. "Damage Analysis and Evaluation of High Strength Concrete Frame Based on Deformation-Energy Damage Model." Mathematical Problems in Engineering 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/781382.

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A new method of characterizing the damage of high strength concrete structures is presented, which is based on the deformation energy double parameters damage model and incorporates both of the main forms of damage by earthquakes: first time damage beyond destruction and energy consumption. Firstly, test data of high strength reinforced concrete (RC) columns were evaluated. Then, the relationship between stiffness degradation, strength degradation, and ductility performance was obtained. And an expression for damage in terms of model parameters was determined, as well as the critical input dat

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Palanivel, S., and M. Sekar. "Cyclic Behaviour of Lateral Ties Confined Polyolefin Fibre Reinforced Concrete under Repeated Axial Compression." Applied Mechanics and Materials 253-255 (December 2012): 537–41. http://dx.doi.org/10.4028/www.scientific.net/amm.253-255.537.

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Although various models exist for envelope curves of concrete confined by transverse reinforcement, only a few simple models represent the hysteretic behavior of the confined concrete; therefore, development of stress–strain model of unloading and reloading paths for confined concrete is needed. In this paper, an experimental and numerical investigation for describing the cyclic stress–strain behavior of lateral ties confined and polyolefin fibre reinforced concrete (CPFRC) prisms under repeated axial compressive loading is presented. The study focuses on the effect of repeated unloading and r

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Palanivel, S., and M. Sekar. "Cyclic Behaviour of GFRP and Lateral Ties Confined Polyolefin Fibre Reinforced Concrete under Axial Repeated Compression." Applied Mechanics and Materials 275-277 (January 2013): 1330–34. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.1330.

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Confinement by fiber reinforced polymer (FRP) wraps can significantly enhance strength and ductility of concrete. Although various models exist for envelope curves of concrete confined by transverse reinforcement and FRP, only a few simple models represent the hysteretic behavior of the confined concrete; therefore, development of stress–strain model of unloading and reloading paths for confined concrete is needed. In this paper, an experimental and numerical investigation for describing the cyclic stress–strain behavior of lateral ties and FRP confined polyolefin fibre reinforced concrete (FR

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Ng, Pui Lam, Jeffery Yuet Kee Lam, and Albert Kwok Hung Kwan. "NONLINEAR MULTILEVEL ANALYSIS OF REINFORCED CONCRETE FRAMES." Engineering Structures and Technologies 7, no. 4 (2016): 168–76. http://dx.doi.org/10.3846/2029882x.2016.1150793.

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Full range analysis of reinforced concrete (RC) members covering the post-crack and post-peak regimes is important for obtaining the deformation response and failure mode of structural members. When a RC member is subject to an increasing external load, the critical sections would exhibit cracking and/or softening. Due to stress relief effect in the proximity of crack opening and plastic hinging, unloading may occur at the adjacent regions. The variable stress states of discrete sections would lead to sectional variation of stiffness, which could not be accounted for by conventional structural

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Yang, Dong Mei, and Xiang Bo Qiu. "A Constitutive Model for Rock Joints under Cyclic Loading." Advanced Materials Research 243-249 (May 2011): 2211–15. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.2211.

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Cyclic loads are commonly encountered in geotechnical engineering; however most constitutive models do not account for the effect that such loads can have on the mechanical behaviour of soils and rocks. This work is concerned with the behaviour of jointed rock and, as the overall mechanical behaviour of jointed rock is usually dominated by the mechanical behaviour of the joints, it is focused on the behaviour of rock joints under cyclic loads. In particular, an extension of the existed constitutive model for cyclically loaded rock joints is presented. Variations of rock joint stiffness in both

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Saleh Asheghabadi, Mohsen, and Xiaohui Cheng. "Analysis of Undrained Seismic Behavior of Shallow Tunnels in Soft Clay Using Nonlinear Kinematic Hardening Model." Applied Sciences 10, no. 8 (2020): 2834. http://dx.doi.org/10.3390/app10082834.

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In this study, a soil–tunnel model for clay under earthquake loading is analyzed, using finite element methods and a kinematic hardening model with the Von Mises failure criterion. The results are compared with those from the linear elastic–perfectly plastic Mohr–Coulomb model. The latter model does not consider the stiffness degradation caused by imposing cyclic loading and unloading to the soil, whereas the kinematic hardening model can simulate this stiffness degradation. The parameters of the kinematic hardening model are calibrated based on the results of experimental cyclic tests and fin

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Suo, Yaqi, Wenwei Yang, and Peng Chen. "Study on Hysteresis Model of Welding Material in Unstiffened Welded Joints of Steel Tubular Truss Structure." Applied Sciences 8, no. 9 (2018): 1701. http://dx.doi.org/10.3390/app8091701.

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The weld form of intersecting joints in a steel tubular truss structure changes with the various intersecting curves. As the key role of joints in energy dissipation and seismic resistance, the weld is easy to damage, as a result the constitutive behavior of the weld is different from that of the base metal. In order to define the cumulative damage characteristic and study the constitutive behavior of welded metal with the influence of damage accumulation, low-cycle fatigue tests were carried out to evaluate overall response characteristics and to quantify variation of cyclic stress amplitude,

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dos Santos, Lindemberg Ferreira, Rodrigo Nogueira de Codes, Erijanio Nonato Silva, and Rodrigo Amaral de Codes. "Study of Damage in the Medium Density Polyethylene Using Digital Image Correlation." Materials Science Forum 869 (August 2016): 356–60. http://dx.doi.org/10.4028/www.scientific.net/msf.869.356.

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The non-linear response of solids is an expression of irreversible processes that originate in microdefects, which are understood as initial material damage. This work aims to analyze the degradation of the mechanical properties of medium density polyethylene through continuum damage mechanics using Digital Image Correlation (DIC). With this technique, displacement and strain fields are obtained throughout the specimen gauge length and therefore optical gauges in any region of interest can measure the strain. Mechanical testing with successive loading and unloading were performed in order to o

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Xu, Lihua, Cuimei Wei, and Biao Li. "Damage Evolution of Steel-Polypropylene Hybrid Fiber Reinforced Concrete: Experimental and Numerical Investigation." Advances in Materials Science and Engineering 2018 (December 12, 2018): 1–23. http://dx.doi.org/10.1155/2018/1719427.

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This paper presents an experimental investigation on the stress-strain behavior and damage evolution of steel-polypropylene hybrid fiber reinforced concrete (HFRC) with different fiber types, volume fractions, and aspect ratios. The damage evolution laws of HFRC were obtained using uniaxial cyclic compression and tension tests. The results show that the addition of hybrid fiber has a significant synergetic effect on the mechanical behavior of concrete. The peak strength, peak strain, toughness, and postpeak ductility of HFRC under both tension and compression are improved, and the damage accum

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Sevenois, Ruben Dirk, Xiaoyu Yang, Erik Verboven, Mathias Kersemans, and Wim Van Paepegem. "Permanent Deformation and Stiffness Degradation of Open Hole Glass/PA6 UD Thermoplastic Composite in Tension and Compression." Materials 14, no. 10 (2021): 2646. http://dx.doi.org/10.3390/ma14102646.

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UD glass/PA6 coupons with an open hole are subjected to tensile and compressive loading. Three layups: [0/90]5s, [+45/−45]5s and [+45/0/−45/90]3s with a shape based on ASTM D5766 were tested. Both monotonic loading as well as loading–unloading–reloading tests were executed. The strain field on the sample surface was measured with digital image correlation. This allowed identifying the distribution of the strain field during loading, permanent deformation and the evolution of the sample elastic modulus. This information is not frequently measured. Yet, it is vital for the development and valida

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Dissertations / Theses on the topic "Unloading stiffness degradation"

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Kurtman, Burak. "A Detailed Analysis For Evaluation Of The Degradation Characteristics Of Simple Structural Systems." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608311/index.pdf.

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Deterioration in the mechanical properties of concrete, masonry and steel structures are usually observed under repeated cyclic loading in the inelastic response range. Therefore such a behavior becomes critical when these types of structures are subjected to ground motions with specific characteristics. The objective of this study is to address the influence of degrading behavior on simple systems. The Structural Performance Database on the PEER web site, which contains the results of cyclic, lateral-load tests of reinforced concrete columns, are employed to quantify the degradation characte

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Conference papers on the topic "Unloading stiffness degradation"

1

Kao, Yi-Tang, Ying Zhang, Jyhwen Wang, and Bruce L. Tai. "Loading-Unloading Cycles of 3D-Printing Built Bi-Material Structures With Ceramic and Elastomer." In ASME 2016 11th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/msec2016-8791.

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This paper studies the loading-unloading behaviors of a 3D-printing built bi-material structure consisting of an open-cellular plaster frame filled with silicone. The combination of the plaster (ceramic phase) and silicone (elastomer phase) is hypothesized to possess a non-linearly elastic property and a better ductility. Four-point bending test with programmed cycles of preceding deformations was conducted. The results show that there exists a linear-nonlinear transition when the bending deflection is around 2 mm in the first cycle bending. As the cycle proceeds, this transition is found at t

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Tannenbaum, J. M., K. Lee, B. S. J. Kang, and M. A. Alvin. "Non-Destructive Thermal Barrier Coating Spallation Prediction by a Load-Based Micro-Indentation Technique." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-37696.

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Currently, the durability and life cycle of thermal barrier coatings (TBC) applied to gas turbine blades and combustor components are limiting the maximum temperature and subsequent efficiency at which gas turbine engines operate. The development of new materials, coating technologies and evaluation techniques is required if enhanced efficiency is to be achieved. Of the current ceramic coating materials used in gas turbine engines, yttria stabilized zirconia (YSZ) is most prevalent, its low thermal conductivity, high thermal expansion coefficient and outstanding mechanical strength make it ide

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Tannenbaum, J. M., B. S. J. Kang, and M. A. Alvin. "Non-Destructive TBC Spallation Detection by a Micro-Indentation Method." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-23500.

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In this research, a load-based depth-sensing micro-indentation method for spallation detection and damage assessment of thermal barrier coating (TBC) materials is presented. A non-destructive multiple loading/partial unloading testing methodology was developed where in stiffness responses of TBC coupons subjected to various thermal cyclic loading conditions were analyzed to predict the spallation site and assess TBC degradation state. The measured stiffness responses at various thermal loading cycles were used to generate time-series color maps for correlation with accumulation of TBC residual

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Kang, B. S. J., C. Feng, J. M. Tannenbaum, and M. A. Alvin. "A Load-Based Depth-Sensing Indentation Technique for Damage Assessment of Thermal Barrier Coatings." In ASME Turbo Expo 2009: Power for Land, Sea, and Air. ASMEDC, 2009. http://dx.doi.org/10.1115/gt2009-59985.

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In this paper, we present a load-based micro-indentation technique for evaluating material mechanical property as well as degradation evaluation and debonding/spallation detection of thermal barrier coating (TBC) materials. Comparing to the current prevailing nano/micro-indentation methods, which require precise measurements of the indentation depth and load, the proposed technique only measures indentation load and the overall indentation displacement (i.e. including load-induced displacement of the loading apparatus). Coupled with a multiple-partial unloading procedure during the indentation

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5

T K, Arya Bharath, and Nisha A.S. "Comparison of Hysteresis Models for Nonlinear Dynamic Analysis of Structural Systems." In International Web Conference in Civil Engineering for a Sustainable Planet. AIJR Publisher, 2021. http://dx.doi.org/10.21467/proceedings.112.35.

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Hysteresis is a non-linear phenomenon exhibited by the mechanical systems. Beyond elastic limit the loading and unloading path of most of the system will differ and that nonlinear path is indicated by hysteresis. The reason for shape of hysteretic cure may due to either changes in material properties beyond the elastic range or due to the changes in structural geometry because of subjected load. This response is a function of both immediate deformation and the previous residual deformation acted on it since it represents the dissipated energy of structure. The hysteretic characteristics or deg

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