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Journal articles on the topic 'Plastic stiffness'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 February 2022

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1

Kerimov, Abdulla, Gary Mavko, Tapan Mukerji, and Jack Dvorkin. "Static and dynamic effective moduli of elastic-perfectly plastic granular aggregates under normal compression." GEOPHYSICS 84, no. 5 (2019): MR185—MR194. http://dx.doi.org/10.1190/geo2018-0509.1.

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Based on an existing simplified theoretical model for the normal contact interaction between two elastic-perfectly plastic spherical particles, we derived explicit expressions for the static and dynamic normal and dynamic tangential contact stiffnesses of elastic-perfectly plastic two-particle combination at pre-yield, yield, and post-yield conditions of normal loading. We used “static stiffness” or “loading stiffness” to refer to the slope of the force-displacement curve during monotonically increasing load. The “dynamic stiffness” or “unloading stiffness” refers to the stiffness that control

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2

Xianglin. "Performance Improvisation of Bituminous Roads using waste Plastic Material." International Journal of Civil, Environmental and Agricultural Engineering 1, no. 1 (2019): 54–61. http://dx.doi.org/10.34256/ijceae1918.

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Utilization of waste plastic as a aggregate in bituminous mix results in weak bonding between the plastic and bitumen. This study reports on the feasibility of using plastic waste and chemical additives to improvise the performance and mechanical properties of bituminous mixtures. The selected recycled waste plastics were used as partial aggregate replacement in bituminous mix product. Strong oxidizing mixture of dichromate and sulphuric acid was used to treat the plastic, while the bitumen was treated with a cross linking agent, polyethylene mine. Three modified bituminous mixtures were prepa

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3

Pando, Miguel, George Filz, Carl Ealy, and Edward Hoppe. "Axial and Lateral Load Performance of Two Composite Piles and One Prestressed Concrete Pile." Transportation Research Record: Journal of the Transportation Research Board 1849, no. 1 (2003): 61–70. http://dx.doi.org/10.3141/1849-08.

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Composite piles use fiber-reinforced polymers (FRPs), plastics, and other materials to replace or protect steel or concrete, with the intent being to produce piles that have lower maintenance costs and longer service lives than those of conventional piles, especially in marine applications and other corrosive environments. Well-documented field loading tests of composite piles are scarce, and this lack of a reliable database may be one reason that composite piles are not in widespread use for load-bearing applications. The purpose of this research is to compare the axial and lateral load behav

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Faragher, E., C. D. F. Rogers, and P. R. Fleming. "Laboratory Determination of Soil Stiffness Data for Buried Plastic Pipes." Transportation Research Record: Journal of the Transportation Research Board 1624, no. 1 (1998): 231–36. http://dx.doi.org/10.3141/1624-27.

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The structural behavior of a buried flexible pipe is influenced by the applied surface loading, the pipe ring stiffness, and the stiffness of the surrounding soil. The pipe stiffness is governed by national standards and can be determined by testing. The more dominant surround stiffness depends on the soil type and its placement and is consequently greatly influenced by site installation processes. There is a relative lack of soil stiffness data, and much of the available data relates to more common installation conditions in the United States (i.e., installation beneath embankments). Describe

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5

Zhang, Yongquan, Hong Lu, Xinbao Zhang, et al. "A normal contact stiffness model of machined joint surfaces considering elastic, elasto-plastic and plastic factors." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 234, no. 7 (2019): 1007–16. http://dx.doi.org/10.1177/1350650119867801.

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Considering the rough surface as a fractal model makes the research of contact parameters more practical. In the fractal model of the machined surface, the parameters describing the surface topography are independent of the measurement resolution. Based on the elastic, elasto-plastic and plastic deformations of a single pair of contact asperities, a normal contact stiffness model using the fractal model for surface topography description is proposed in this paper. The specimens machined by milling and grinding methods are used to verify the proposed contact stiffness model based on the fractal

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6

Bareišis, Jonas, Danas Garuckas, Alvydas A. Mikulskas, and Danguolė Striukienė. "STRAINS AND STRESSES OF THREE—LAYER COMPOSITE BARS AND BEAMS/TRISLUOKSNIŲ KOMPOZITINIŲ STRYPŲ IR SIJŲ DEFORMACIJOS BEI ĮTEMPIMAI." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 3, no. 10 (1997): 5–11. http://dx.doi.org/10.3846/13921525.1997.10531677.

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New composite anisotropic materials (CM) glass, carbon and boric plastics are more and more frequently used in engineering construction. By tuning strength and stiffness characteristics of CM under tension or bending with their density or price it is possible to get laminated construction of maximum strength and stiffness and minimum mass or price. The purpose of this work is to analyse regularity of distribution of stiffness or strains and stresses in three-layer bars, subjected to tension or bending by changing geometric characteristics of layer, materials and their position in cross-section

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7

Lin, Wenlong. "A new expression to predict secant rotational stiffness of spudcan in undrained soils." E3S Web of Conferences 248 (2021): 03014. http://dx.doi.org/10.1051/e3sconf/202124803014.

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The nonlinear behavior of spudcan foundation will lead to the decrease of the rotational stiffness of the spudcan, leading to the increase of the stress at the critical member of the offshore jack-up drilling platform. Secant rotational stiffness is used to represent the value of rotational stiffness of linear foundation model when the soil changes from elastic to elasto-plastic and then to plastic. In this paper, the “wished in-place” small strain finite element analysis (SSFE) analysis is used to simulate the load-displacement response of spudcans pre-embedded in the plastic soil, thus calcu

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8

Yang, Hongping, Xiaowei Che, and Cheng Yang. "Investigation of normal and tangential contact stiffness considering surface asperity interaction." Industrial Lubrication and Tribology 72, no. 3 (2019): 379–88. http://dx.doi.org/10.1108/ilt-03-2019-0072.

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Purpose This paper aims to propose a normal and tangential contact stiffness model to investigate the contact characteristics between rough surfaces of machined joints based on fractal geometry and contact mechanics theory considering surface asperities interaction. Design/methodology/approach The fractal geometry theory describes surface topography and Hertz contact theory derives the asperities elastic, elastic-plastic and plastic contact deformation. The joint normal and tangential contact stiffness are obtained. The experiment method for normal and tangential contact stiffness are introduc

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9

MOY, S. S. J., R. A. SHENOI, and H. G. ALLEN. "STRENGTH AND STIFFNESS OF FIBRE-REINFORCED PLASTIC PLATES." Proceedings of the Institution of Civil Engineers - Structures and Buildings 116, no. 2 (1996): 204–20. http://dx.doi.org/10.1680/istbu.1996.28288.

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10

SHUGYO, MINORU, YOSHIHIRO HAYATA, JIAN NIAN XU, and HIDESUMI TANIGUCHI. "ELASTIC-PLASTIC TANGENT STIFFNESS MATRIX OF TUBULAR MEMBERS." Journal of Structural and Construction Engineering (Transactions of AIJ) 400 (1989): 91–99. http://dx.doi.org/10.3130/aijsx.400.0_91.

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11

Wigg, P. J. C., P. W. May, and D. Smith. "Stiffness measurements of diamond fibre reinforced plastic composites." Diamond and Related Materials 12, no. 10-11 (2003): 1766–70. http://dx.doi.org/10.1016/s0925-9635(03)00272-3.

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12

Chang, Chih-Chao. "Consistent stiffness iteration method for elastic-plastic analysis." Computers & Structures 43, no. 2 (1992): 255–63. http://dx.doi.org/10.1016/0045-7949(92)90142-m.

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13

Du, Chang Long, Yu Liu, and Jian Ping Li. "Numerical Analysis on Impact Load of Elasto-Plastic Spherical Impact." Advanced Materials Research 189-193 (February 2011): 1840–43. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.1840.

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The spherical impact is a common phenomenon in mechanical engineering. The elasto-plastic impact is more complicate than the elastic impact. The elasto-plastic impact loads are investigated for the different contact stiffness and the different impact velocity by the nonlinear finite element method. The accuracy and reliability of the finite elements model are verified by comparing the numerical results of the elastic impact with the Hertz results. The elasto-plastic impact simulation shows that the impact loads have a negative exponential relation with the contact stiffness as well as a linear

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14

Guo, TieNeng, Xu Hua, ZhiJie Yan, and Chunsheng Bai. "Research on the elastic–plastic external contact mechanical properties of cylinder." Science Progress 103, no. 2 (2020): 003685042092781. http://dx.doi.org/10.1177/0036850420927817.

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Based on Hertz contact theory, an elastic-plastic contact mechanics model of outer cylinder under different contact angles of axis is proposed. The relationship among contact angle, load and contact deformation, contact stiffness and contact area is established. The finite element method is used to simulate the elastic-plastic contact process of the cylinder. The influence of the load and radius of the cylinder model on the contact deformation and the contact stiffness is compared and analyzed under different contact angles. The error of the analysis results of the finite element and the mecha

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15

Li, Hai Wang, Yu Ma, and Jing Liu. "Dynamic Elasto-Plastic Analysis on the Steel Spatial Arch Truss with 120 m Span and 0.4 Rise-Span Ratio." Applied Mechanics and Materials 105-107 (September 2011): 862–66. http://dx.doi.org/10.4028/www.scientific.net/amm.105-107.862.

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In this paper, the elasto-plastic dynamic analysis on the steel spatial arch truss with 120 m span and 0.4 rise-span ratio is carried out under earthquake EL-Centro wave with SAP2000 about pin-connected model and rigid truss model. The geometric and material nonlinear effects are considered simultaneously based on the plastic-hinge theory. The study shows that the vertical stiffness of the two models is smaller than horizontal stiffness; the failure mode of the pin-connected truss model under the earthquake action is elasto-plastic dynamic buckling, and the failure mode of the rigid truss mode

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16

Li, Jun Peng, Xiao Li, and Dong Qing Zhu. "Incremental Variable Plastic Three-Dimensional Elastic-Plastic Finite Element Analysis in Soft Rock Tunnel Excavation." Applied Mechanics and Materials 508 (January 2014): 243–48. http://dx.doi.org/10.4028/www.scientific.net/amm.508.243.

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The plane finite element analysis is mostly adopted in soft rock tunnel excavation instead of three-dimensional nonlinear finite element analysis at present, but almost every underground engineering is a spatial nonlinear problem which, in many cases, cannot be simplified into a plane problem. This paper presents a three-dimensional elastic-plastic finite element analysis of incremental variable plastic in soft rock tunnel excavation, through analyzing the tunnel excavation and support, and combining the incremental variable plastic stiffness method into three-dimensional elastic-plastic model

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17

Jiang, Zhi Cai, and Wei Lian Qu. "Buckling Analysis of the Tube Compression-Bending Member in Elastic-Plastic State with ANSYS." Advanced Materials Research 327 (September 2011): 143–48. http://dx.doi.org/10.4028/www.scientific.net/amr.327.143.

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Stability is an important issue in steel structure design.When the steel member is subjected to elastic-plastic instability, the axial compression stiffness reduces with the increasing axial pressure and bending moment at end. Therefore, the authors analyze the process of steel member that is instable in elastic-plastic state in this paper by studying the degradation laws of axial compression stiffness. The eigenvalue buckling and nonlinear buckling analyses of axially compressed member and compression-bending member are carried out by using commercial package ANSYS in this study. The relation

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18

Ancas, Ana Diana, M. Profire, I. L. Cirstolovean, M. Hornet, and G. Cojocaru. "Lifetime Glass Reinforced Plastic Pipes by Measuring the Stiffness." Journal of Applied Engineering Sciences 8, no. 1 (2018): 7–12. http://dx.doi.org/10.2478/jaes-2018-0001.

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Abstract The lifetime of glass reinforced plastic pipes is 50 years. Extensive use of this type of pipe in its various applications, led to investigate their behavior in land that anthropogenic or natural causes, shows the different values of pH to neutral. The paper presents experimental results conducted on three samples of a PN SN10000 DN150 PN10 pipe buried in three different types of terrain: neutral, acidic, basic. They were subjected to axial load, measuring the force applied deformation force function. On the basis of the calculation formulas determined rigidity of the pipeline, the de

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19

Pestka, Kenneth A., and Cori Warren. "Hooke's Law and the Stiffness of a Plastic Spoon." Physics Teacher 50, no. 8 (2012): 470–71. http://dx.doi.org/10.1119/1.4758145.

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20

Hübel, Hartwig, and Bastian Vollrath. "Effect of stress stiffness on elastic-plastic strain range." International Journal of Pressure Vessels and Piping 192 (August 2021): 104421. http://dx.doi.org/10.1016/j.ijpvp.2021.104421.

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21

Li, Yeou Fong, and Shu Ting Kan. "The Mechanical Behavior of the Hybrid FRP Beam." Advanced Materials Research 365 (October 2011): 119–24. http://dx.doi.org/10.4028/www.scientific.net/amr.365.119.

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This paper presents the mechanical behaviors of hybrid fiber reinforced plastic (HFRP) composite beams. There are two methods were proposed to increase the stiffness of pultruded glass fiber reinforced plastic (GFRP) beam and change the failure mode. The first method is to infill the epoxy mortar into the GFRP beam. The second method is hand layout the GFRP beam by using carbon fiber with different direction fibers to increase the stiffness of the GFRP beam. Three-point bending test was conducted to obtain the force-displacement relationship, stiffness, failure strength and failure mode of the

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22

Abdia, M., H. Molladavoodi, and H. Salarirad. "Rock Failure Analysis Based on a Coupled Elastoplastic-Logarithmic Damage Model." Archives of Mining Sciences 62, no. 4 (2017): 753–74. http://dx.doi.org/10.1515/amsc-2017-0053.

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Abstract The rock materials surrounding the underground excavations typically demonstrate nonlinear mechanical response and irreversible behavior in particular under high in-situ stress states. The dominant causes of irreversible behavior are plastic flow and damage process. The plastic flow is controlled by the presence of local shear stresses which cause the frictional sliding. During this process, the net number of bonds remains unchanged practically. The overall macroscopic consequence of plastic flow is that the elastic properties (e.g. the stiffness of the material) are insensitive to th

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23

Sumiya, T., Y. Suzuki, and T. Kasahara. "Stiffness control in posterior-type plastic ankle-foot orthoses: Effect of ankle trimline Part 2: Orthosis characteristics and orthosis/patient matching." Prosthetics and Orthotics International 20, no. 2 (1996): 132–37. http://dx.doi.org/10.3109/03093649609164431.

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The hingeless plastic ankle-foot orthosis (AFO) changes stiffness largely depending on how much plastic is trimmed around the ankle. To support proper selection of the orthosis and final adjustment of the orthotic stiffness, the correlation between the posterior upright width and the resistance to dorsi- and plantar flexion movements was measured in 30 posterior-type plastic AFOs. The posterior upright width was varied by regularly trimming around the ankle in nine stages. The resistance to dorsi- and plantar flexion movements was measured by bending the plastic AFOs 15d` with the measuring de

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24

HU, YUN-HUA, and QUAN-SHENG LIU. "EXPERIMENT STUDY ON MECHANICAL PROPERTIES OF GRANITE UNDER REPEATED LOADING AND UNLOADING." International Journal of Modern Physics B 22, no. 09n11 (2008): 1634–39. http://dx.doi.org/10.1142/s0217979208047183.

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Deformation rules and acoustic emission characteristics of granite under repeated loading-unloading are studied using the MTS Mechanics Testing System and Disp. acoustic emission instrument. It's found that the axial stiffness of granite as well as Poisson's ratio increases with the development of the plastic strain while the change trend of lateral stiffness is negative. For brittle rocks, strain is produced by three mechanisms: elastic deformation, axial micro-cracking and compaction. The peak AE rate is increasing with the plastic strain, which indicates that using the axial plastic strain

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25

Kannas, Haitham, and Abdallah M. S. Wafi. "Study of the plastic-hinge analysis of 3D steel frames applying nonlinear static analysis." International Journal of Advanced Engineering, Sciences and Applications 1, no. 3 (2020): 24–29. http://dx.doi.org/10.47346/ijaesa.v1i3.38.

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This paper provides a distinct study on the performance of different residential buildings with different height and length spans under the influence of applied loads according to the Turkish standard TS498. The research paper presents the nonlinear performance of the buildings and provides a clear picture of the plastic and its stages throughout the construction. The study explains the effect of the various stages of plastic and how it affects the rigidity of the building. The results portray the building's stiffness values and how they change. The results show that stiffness increases with l

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Sun, Qingchao, Xin Liu, Xiaokai Mu, and Yichao Gao. "Estimation for normal contact stiffness of joint surfaces by considering the variation of critical deformation." Assembly Automation 40, no. 3 (2020): 399–406. http://dx.doi.org/10.1108/aa-03-2019-0059.

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Purpose This paper aims to study the relationship between normal contact stiffness and contact load. It purpose a new calculation model of the normal contact stiffness of joint surfaces by considering the elastic–plastic critical deformation change of asperities contact. Design/methodology/approach The paper described the surface topography of joint surfaces based on fractal geometry, and fractal parameters and of fractal function derived from measurement data. According to the plastic–elastic contact theory, the contact deformation characteristic of asperities was analyzed; the critical defor

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27

Haefele, Peter, and Oscar Herrera. "Strength and Stiffness Degradation of Carbon Fiber Reinforced Plastic under Cyclic Loading under Membran-, Shear- and Bending Loading." Materials Science Forum 825-826 (July 2015): 968–75. http://dx.doi.org/10.4028/www.scientific.net/msf.825-826.968.

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In order to meet the increasing lightweight requirements, the application of fiber reinforced plastics is indispensable. To ensure the structural durability of the car or machine under operational conditions, it is essential to know the long term behavior of carbon fiber reinforced plastic material (CFRP) under the numerous influencing factors under fatigue loading. For a reliable safety assessment of the car structure under operational conditions, the degradation of the stiffness and of the static strength after a certain damage due to cyclic loading is of particular importance. The paper cov

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28

Zhu, Linbo, Jian Chen, Zaoxiao Zhang, and Jun Hong. "Normal contact stiffness model considering 3D surface topography and actual contact status." Mechanical Sciences 12, no. 1 (2021): 41–50. http://dx.doi.org/10.5194/ms-12-41-2021.

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Abstract. A normal contact stiffness model considering 3D topography and elastic–plastic contact of rough surfaces is presented in this paper. The asperities are generated from the measured surfaces using the watershed segmentation and a modified nine-point rectangle. The topography parameters, including the asperity locations, heights, and radii of the summit, are obtained. Asperity shoulder–shoulder contact is considered. The relationship of the contact parameters, such as the contact force, the deformation, and the mean separation of two surfaces, is modelled in the three different contact

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29

Gottlieb, G. L., and G. C. Agarwal. "Compliance of single joints: elastic and plastic characteristics." Journal of Neurophysiology 59, no. 3 (1988): 937–51. http://dx.doi.org/10.1152/jn.1988.59.3.937.

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1. Step changes in torque were applied to the elbow or ankle joint of normal human subjects who exerted constant levels of effort. They were instructed to not react to the torque but to allow their limbs to move to a new equilibrium position. In this experimental paradigm, the joint may be characterized by a nonlinear compliant element. The aim of this study was to characterize the elastic properties of the compliant element. 2. Joint elasticity is described by an S-shaped relation between torque and angle (a "compliant characteristic curve"). The stiffness of a joint is greatest for small per

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30

Ni, Jun, and Zhenqi Zhu. "Experimental Study of Tangential Micro Deflection of Interface of Machined Surfaces." Journal of Manufacturing Science and Engineering 123, no. 2 (1999): 365–67. http://dx.doi.org/10.1115/1.1352020.

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This paper studies the characteristics of micro tangential deflection of the interface of mating machined surfaces subjected to normal and tangential forces. Experimental results show that contact interface subjected to a tangential force experiences elastic deformation, plastic deformation and micro slip before macro-breakaway occurs. The linearity of tangential stiffness is only valid in the stage of elastic deformation. The nonlinear tangential stiffness of the interface should be considered in the stages of elastic and plastic deformation before micro-breakaway occurs.

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31

Abdulla, Nwzad Abduljabar. "Strength of Concrete-Filled Plastic Tube Stub Columns Using a Normalized Stiffness Approach." Advanced Materials Research 1163 (April 2021): 174–89. http://dx.doi.org/10.4028/www.scientific.net/amr.1163.174.

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The polymeric plastic tube can encase concrete and provide an external shell for confining and insulating concrete core from the impact of the surrounding environment. The effect of the tube and concrete strength on the concrete-filled plastic tubes (CFPT) stub columns specimens was investigated. Test results show that the tube provides passive confinement to the concrete core, which increases both the maximum peak load and the ultimate strain capacities. However, the tube has low stiffness, which affects its confinement capacity and hindrance its applications for structural use. To examine th

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Neuenschwander, Martin, Claudio Scandella, Markus Knobloch, and Mario Fontana. "Experimental validation of the damage-plasticity modeling concept for normal strength concrete in fire." Journal of Structural Fire Engineering 9, no. 1 (2018): 53–62. http://dx.doi.org/10.1108/jsfe-01-2017-0001.

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Purpose This paper aims to investigate with strain-rate controlled uniaxial cyclic compression tests the softening behavior of concrete and its elastic stiffness degradation with increasing plastic straining. Design/methodology/approach Such tests at ambient temperature show that concrete exhibits the phenomenon of elastic stiffness degradation, which can be captured by damage-plasticity models. Findings The experimentally derived evolutions of the elastic stiffness with plastic strain confirm the suitability of the damage-plasticity modeling concept for concrete in compression at elevated tem

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33

Li, Guo-Qiang, Zu-Yan Shen, and Jing-Yu Huang. "Spatial hysteretic model and elasto-plastic stiffness of steel columns." Journal of Constructional Steel Research 50, no. 3 (1999): 283–303. http://dx.doi.org/10.1016/s0143-974x(98)00239-9.

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34

Karkauskas, R., and A. Norkus. "Optimization of geometrically nonlinear elastic-plastic structures under stiffness constraints." Mechanics Research Communications 28, no. 5 (2001): 505–12. http://dx.doi.org/10.1016/s0093-6413(01)00202-6.

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35

Barros da S. Santos Neto, Almir, and Henriette Lebre La Rovere. "Flexural stiffness characterization of fiber reinforced plastic (FRP) pultruded beams." Composite Structures 81, no. 2 (2007): 274–82. http://dx.doi.org/10.1016/j.compstruct.2006.08.016.

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36

Mazza, Fabio. "A plastic-damage hysteretic model to reproduce strength stiffness degradation." Bulletin of Earthquake Engineering 17, no. 6 (2019): 3517–44. http://dx.doi.org/10.1007/s10518-019-00606-3.

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37

Ristinmaa, M. "Consistent stiffness matrix in FE calculations of elasto-plastic bodies." Computers & Structures 53, no. 1 (1994): 93–103. http://dx.doi.org/10.1016/0045-7949(94)90133-3.

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38

Zhang, Hao, Qiu-shi Chen, Jin-jian Chen, and Jian-hua Wang. "Elasto-plastic modeling of soft soil considering degradation of stiffness." Journal of Shanghai Jiaotong University (Science) 20, no. 6 (2015): 683–89. http://dx.doi.org/10.1007/s12204-015-1677-9.

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39

King, W. S. "A modified stiffness method for plastic analysis of steel frames." Engineering Structures 16, no. 3 (1994): 162–70. http://dx.doi.org/10.1016/0141-0296(94)90074-4.

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40

Košík, Miroslav, Jozef Bílik, and Filip Polakovič. "Mechanical Benefits of Gas Assisted Injection Moulding Application in Design of Structural Parts." Materials Science Forum 862 (August 2016): 182–91. http://dx.doi.org/10.4028/www.scientific.net/msf.862.182.

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Due to of many advantages and specific properties plastics are gradually becoming the most widely used materials in the engineering industry. In the last years, more and more metal parts are converted to plastic, in the cases of mechanically loaded parts as well. However, the usage of plastic is limited by its mechanical properties and production possibilities. Conventional injection moulding as the most productive plastic part production technology mostly enables the manufacturing of thin-wall parts with uniform wall thickness, what restricts full-fledged utilization of plastics. In this stud

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Ianakiev, Anton, and Hooi Cheah. "Glass Fibre Reinforced Composites from Recycled Polymers." Key Engineering Materials 572 (September 2013): 28–31. http://dx.doi.org/10.4028/www.scientific.net/kem.572.28.

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The paper analyses the development and market potential of composite structure boards for the construction and built environment. The composite material is based on using recycled plastic reinforced with glass fibres. For some plastic materials, the Young modulus is relatively low and a sandwich structure built from plastic skin and foam core has to be used in order to achieve the required stiffness. The structural boards will be formed by a single one or two step moulding process instead of fabricated in a number of processes. The contens of the board has been optimised to reduce its weight a

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Shi, Guangyu, and G. Z. Voyiadjis. "A Computational Model for Fe Ductile Plastic Damage Analysis of Plate Bending." Journal of Applied Mechanics 60, no. 3 (1993): 749–58. http://dx.doi.org/10.1115/1.2900868.

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This paper presents a computational model for the finite element plastic damage analysis of ductile flexural plates. The phenomenological damage model proposed by Lemaitre is adopted here. The damage effect parameters of a cross-section are defined and employed to account for the damage effect across the thickness of a bending plate. Similar to the effective stresses used in many damage models, the effective stress couples are introduced in this work and used in the yield function. The damage criterion is defined in terms of damage strain energy release rates. Based on the damage node model pr

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Kim, Sang-Young, Bin He, Dave (Dae-Wook) Kim, Chun Sik Shim, and Ha Cheol Song. "Bearing strength of interference-fit pin joined glass fiber reinforced plastic composites." Journal of Composite Materials 54, no. 12 (2016): 1579–91. http://dx.doi.org/10.1177/0021998316636462.

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Glass fiber reinforced plastic structures are mostly used in mid-sized marine vessels due to high strength and stiffness to weight ratio, corrosion resistance, and total life cost reductions. Mechanical joints using metallic bolts, screws, and pins are commonly used for joining thick glass fiber reinforced plastic laminates. Interference-fit pin connections provide beneficial effects such as fatigue enhancement and/or prevention of moisture intrusion to the fiber reinforced composites. This numerical and experimental study aims to investigate the effect of interference-fit on the bearing stiff

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Yang, Wen Wei, and Xu Hong Zhou. "Advanced Analysis of Staggered Truss of Steel Structure." Advanced Materials Research 446-449 (January 2012): 615–20. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.615.

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Based on refined plastic hinge, this paper considers the effects of second-order effects of structure plastic strength, geometric imperfection ,residual stresses to the structure stability by modifying the element stiffness matrix. Use the modified element stiffness matrix to analyze the force of the staggered truss of steel sturcture and compare the calculation results with ANASYS’s. Use the modified element stiffness matrix to analyze interstory drift of the staggered truss of steel sturcture and compare the calculation results with K Jim’s. The result shows that the developed element matrix

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Xiang, Guo, Yijia Wang, Cheng Wang, and Zhongliang Lv. "Numerical study on the dynamic characteristics of water-lubricated rubber bearing under asperity contact." Industrial Lubrication and Tribology 73, no. 4 (2021): 572–80. http://dx.doi.org/10.1108/ilt-12-2020-0453.

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Purpose In this study, the dynamic characteristics of the water-lubricated rubber bearing considering asperity contact are numerically studied, including water-film stiffness and damping coefficients and plastic-elastic contact stiffness coefficient. Design/methodology/approach The Kogut-Etsion elastic-plastic contact model is applied to calculate the contact stiffness coefficient at the bearing-bush interface and the perturbed method is used to calculate the stiffness and damping coefficients of water-film. In addition, the rubber deformation is determined by the finite element method (FEM) d

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Zeng, Shan Qi, Da Yong Cheng, and Yi Ding. "Researching the Influence of Carton Stiffness on the Hopper Design of Packaging Machine." Advanced Materials Research 338 (September 2011): 517–20. http://dx.doi.org/10.4028/www.scientific.net/amr.338.517.

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Through studying carton stiffness, the hopper design of packaging machine is improved. By using the elastic-plastic theory and finite element stress analysis method, the hopper baffle design of automatic tea packaging machine is optimized in order to reduce the requirements of equipment for paper, solve the problem that automatic packaging machine stop work. At the same time, the stress analysis of carton is taken through the ANSYS to derive that the suction of sucker satisfy the requirements of carton stiffness or not, the carton appear plastic deformation in the force process or not.

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Yang, Dong Quan, and Hong Peng. "Elasto-Plastic Analysis of Frame Structures under Large Displacement-Rotation Deformations." Advanced Materials Research 243-249 (May 2011): 5968–74. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.5968.

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A finite element program for elasto-plastic analysis of 3D beams and frame structures under large displacement/rotations is developed. The element is Timoshenko beam element based on mechanics of continuum. Constitutive equations for large displacements/rotations in elastic stage are expressed in an explicit way which is suitable for programming. The modification of constitutive equation is presented for the analysis of elasto-plastic problems. A fiber model is adopted for the calculation of stiffness matrix and internal forces. For solution of nonlinear finite element equations, general displ

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Zhao, Yongsheng, Xiaolei Song, Ligang Cai, Zhifeng Liu, and Qiang Cheng. "Surface fractal topography-based contact stiffness determination of spindle–toolholder joint." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 230, no. 4 (2015): 602–10. http://dx.doi.org/10.1177/0954406215578483.

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Accurate modeling of contact stiffness is crucial in predicting the dynamic behavior and chatter vibration of spindle–toolholder system for high-speed machining centers. This paper presents a fractal theory-based contact model of spindle–toolholder joint to obtain the contact stiffness and its real contact area. Topography of the contact surfaces of spindle–toolholder joint is fractal featured and determined by fractal parameters. Asperities in micro-scale are considered as elastic or plastic deformation. Then, the contact stiffness, the real contact area, the elastic contact force, and the pl

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Terazawa, Yuki, and Toru Takeuchi. "Generalized Response Spectrum Analysis for Structures with Dampers." Earthquake Spectra 34, no. 3 (2018): 1459–79. http://dx.doi.org/10.1193/092217eqs188m.

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In this study, a computational seismic design routine is proposed based on a generalized response spectrum analysis for highly indeterminate structures with energy-dissipation members, such as viscous or elasto-plastic dampers. Complex stiffness terms are introduced to account for displacement-dependent damping, and a three-dimensional (3-D) element stiffness matrix with complex axial stiffness is proposed for elasto-plastic dampers. A modified complete quadratic combination method previously developed for real symmetric damped systems is extended to complex asymmetric damped systems, based on

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Wei, Liu, Shu Ganping, and Chan Siulai. "Research on Advanced Analysis Method of Semi-Rigid Steel Frames." Open Construction and Building Technology Journal 9, no. 1 (2015): 12–16. http://dx.doi.org/10.2174/1874836801509010012.

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The advanced analysis method used to analyze semi-rigid steel frames is introduced, and the method could take account of many factors influencing structure mechanical performance. These factors include: initial imperfect mode of structure and members, geometrical nonlinearity (P-∆, P-δ effects), material nonlinearity and semi-rigid connections. The Curved Stability Function (CSF) element is built to take account of initial imperfect state, semi-rigid connections and plastic hinge, and derivatives of the second-order element stiffness matrix to extend the spatial element stiffness matrix. The n

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