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Journal articles on the topic 'Material nonlinearity'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Jun, Jihyun, and Kyung-Young Jhang. "Indirect Method for Measuring Absolute Acoustic Nonlinearity Parameter Using Surface Acoustic Waves with a Fully Non-Contact Laser-Ultrasonic Technique." Applied Sciences 10, no. 17 (2020): 5911. http://dx.doi.org/10.3390/app10175911.

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This paper proposes an indirect method to measure absolute acoustic nonlinearity parameters using surface acoustic waves by employing a fully non-contact laser-ultrasonic technique. For this purpose, the relationship between the ratio of relative acoustic nonlinearity parameters measured using the proposed method in two different materials (a test material and a reference material) and the ratio of absolute acoustic nonlinearity parameters in these two materials was theoretically derived. Using this relationship, when the absolute nonlinearity parameter of the reference material is known, the

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2

Domichev, K. "MODELING THE BEHAVIOR OF THE PHYSICAL AND GEOMETRIC NON-LINEAR FUNCTIONAL HETEROGENEOUS MATERIALS." Innovative Solution in Modern Science 1, no. 45 (2021): 82. http://dx.doi.org/10.26886/2414-634x.1(45)2021.5.

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The work is devoted to the problem of modeling the behavior of functionally inhomogeneous materials with the properties of pseudo-elastic-plasticity under complex loads, in particular at large strains (up to 20%), when geometric nonlinearity in Cauchy relations must be taken into account. In previous works of the authors, functionally heterogeneous materials were studied in a geometrically linear formulation, which is true for small deformations (up to 7%). When predicting work with material at large deformations, it is necessary to take into account geometric nonlinearity in Cauchy relations.

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3

Park, Byeongho, and Seong Chan Jun. "Optical nonlinearity in genetic material." Transactions of the Society of Information Storage Systems 10, no. 1 (2014): 19–22. http://dx.doi.org/10.9797/tsiss.2014.10.1.019.

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4

Gómez Cassab, Alexander, and Juan Manuel Lizarazo Marriaga. "Nonlinear material influence on reinforced concrete beams’ immediate deflections." Ingeniería e Investigación 27, no. 2 (2007): 92–99. http://dx.doi.org/10.15446/ing.investig.v27n2.14835.

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This paper presents an analytical and experimental research programme’s results regarding material nonlinearity’s influence on reinforced concrete beams’ immediate deflections. Six full-size laboratory beams were tested under different type of loads in the experimental programme. The ANSYS finite element software nonlinear material model was used for simulating the beams’ analytical behavior. Comparing ANSYS nonlinear material model results, ACI 318 equations and the results of the tests made revealed that a beam’s structural behavior is strongly influenced by material nonlinearity.

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5

Wang, Pengfei, Weiqiang Wang, and Jianfeng Li. "Research on Fatigue Damage of Compressor Blade Steel KMN-I Using Nonlinear Ultrasonic Testing." Shock and Vibration 2017 (2017): 1–11. http://dx.doi.org/10.1155/2017/4568460.

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The fatigue damage of compressor blade steel KMN-I was investigated using nonlinear ultrasonic testing and the relation curve between the material nonlinearity parameter β and the fatigue life was obtained. The results showed that the nonlinearity parameter increased first and then decreased with the increase of the fatigue cycles. The microstructures were observed by scanning electron microscopy (SEM). It was found that some small defects like holes and pits appeared in the material matrix with the increase of the fatigue cycles, and the nonlinearity parameter increased correspondingly. The n

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6

Fedulov, Boris, Daria Bondarchuk, and Evgeny Lomakin. "Longitudinal elastic nonlinearity of composite material." Frattura ed Integrità Strutturale 18, no. 67 (2023): 311–18. http://dx.doi.org/10.3221/igf-esis.67.22.

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It is known that the initial waviness of the fiber affects the stiffness characteristics and strength of the polymer composite material. The article presents a continuum model taking into account the nonlinearity of the longitudinal stiffness of the unidirectional composite. In this study, a finite element experiment was conducted to investigate the variations in the longitudinal stiffness of the composite material subjected to uniaxial compression. The experiment considered a range of different degree of fiber’s waviness to comprehensively examine the impact on the material's stiffness. Obtai

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7

Clarke, Ryan J., Brandon L. Ennis, David A. Miller, and Daniel D. Samborsky. "Accurate Modeling of Material Nonlinearities in a Wind Turbine Spar Cap." Journal of Physics: Conference Series 2265, no. 3 (2022): 032035. http://dx.doi.org/10.1088/1742-6596/2265/3/032035.

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Abstract This study presents component-level testing of carbon fiber sandwich beams and the effect of carbon fiber material nonlinearity in its strain response in bending. A simple material model is presented and validated that accurately captures the carbon fiber longitudinal nonlinearity in both the tensile and compressive response. This material model is implemented in a finite element model of the BAR-DRC reference wind blade, a downwind 100-meter rotor blade, and the effects of the nonlinearity on ultimate limit states of the blade are analyzed. The material nonlinearity has negligible ef

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Madhuranthakam, Yoganandh, and Sunil Kishore Chakrapani. "Analytical Study of Nonlinear Flexural Vibration of a Beam with Geometric, Material and Combined Nonlinearities." Vibration 7, no. 2 (2024): 464–78. http://dx.doi.org/10.3390/vibration7020025.

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This article explores the nonlinear vibration of beams with different types of nonlinearities. The beam vibration was modeled using Hamilton’s principle, and the equation of motion was solved using method of multiple time scales. Three models were developed assuming (a) geometric nonlinearity, (b) material nonlinearity and (c) combined geometric and material nonlinearity. The material nonlinearity also included both third and fourth nonlinear elasticity terms. The frequency response equation of these models were further evaluated quantitatively and qualitatively. The models capture the hardeni

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9

Vitalii, Myntiuk. "Spectral solution to a problem on the axisymmetric nonlinear deformation of a cylindrical membrane shell due to pressure and edges convergence." Eastern-European Journal of Enterprise Technologies 5, no. 7 (113) (2021): 6–13. https://doi.org/10.15587/1729-4061.2021.242372.

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A geometrically and physically nonlinear model of a membrane cylindrical shell, which has been built and tested, describes the behavior of a airbag made of fabric material. Based on the geometrically accurate relations of "strain-displacement", it has been shown that the equilibrium equations of the shell, written in terms of Biot stresses, together with boundary conditions acquire a natural physical meaning and are the consequences of the principle of virtual work. The physical properties of the shell were described by Fung’s hyper-elastic biological material because its behav

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10

Smith, Elizabeth, and Kathryn Matlack. "Wave propagation in a continuum phononic material with geomaterial-inspired nonlinearity." Journal of the Acoustical Society of America 151, no. 4 (2022): A41. http://dx.doi.org/10.1121/10.0010594.

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This presentation discusses the nonlinear wave propagation in a continuum phononic material with nonlinear mechanisms inspired by geomaterials. Geomaterials can exhibit nonlinear wave responses due to mechanisms such as material nonlinearity or lack of bonding between phases of material. We study the interaction of nonlinear and phononic behavior by introducing two geomaterial-inspired nonlinear mechanisms into a phononic material. The influence of material nonlinearity and nonlinearity due to delaminations between material phases are studied in a bilayer finite element model composed of alter

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11

Shikula, E. "CONSTRUCTION OF A MODEL OF NONLINEAR DEFORMATION OF SPATIALLY-REINFORCED FIBER MATERIALS WITH DISORDERED FIBERS." Collection of scientific works of the State University of Infrastructure and Technologies series "Transport Systems and Technologies", no. 39 (June 30, 2022): 153–66. http://dx.doi.org/10.32703/2617-9040-2022-39-15.

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A model of nonlinear deformation of fibrous materials of multidirectional reinforcement with misoriented fibers and a physically nonlinear matrix is proposed. A spatially reinforced fibrous material is regarded as a multicomponent material with a random arrangement of fibers. It is based on stochastic differential equations of the physically nonlinear theory of elasticity. The solution to the problem of the stress-strain state and the effective properties of the composite material is constructed by the method of conditional moments of L.P. Khoroshun. An algorithm for determining the effective

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12

Shikula, E. N., and N. B. Zhukova. "Model of nonlinear deformation of granular composites." Bulletin of Taras Shevchenko National University of Kyiv. Series: Physics and Mathematics, no. 2 (2023): 168–71. http://dx.doi.org/10.17721/1812-5409.2023/2.30.

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The model of nonlinear deformation of a granular composite material of a stochastic structure with physically nonlinear components was constructed. The basis is the stochastic differential equations of the physically nonlinear theory of elasticity by L.P. Khoroshun. The solution to the problem of the stress-strain state and effective deformable properties of the composite material is built using the averaging method. An algorithm for determining the effective properties of granular material with physically nonlinear components has been developed. The solution of nonlinear equations, taking int

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13

Thayaparan, Philip A., and Karen C. Chou. "Stochastic Load Exceedances with General Material Nonlinearity." Journal of Structural Engineering 114, no. 7 (1988): 1674–86. http://dx.doi.org/10.1061/(asce)0733-9445(1988)114:7(1674).

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14

Miri, Mohammad-Ali, and Andrea Alù. "Nonlinearity-induced PT-symmetry without material gain." New Journal of Physics 18, no. 6 (2016): 065001. http://dx.doi.org/10.1088/1367-2630/18/6/065001.

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15

Liu, Siming, Steven Best, Simon A. Neild, Anthony J. Croxford, and Zhenggan Zhou. "Measuring bulk material nonlinearity using harmonic generation." NDT & E International 48 (June 2012): 46–53. http://dx.doi.org/10.1016/j.ndteint.2012.02.009.

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16

Gridnev, S. A., and N. I. Repnikov. "Dielectric nonlinearity of the glassy material Bi1.8Pb0.3Sr2Ca2Cu2.7K0.3Oz." physica status solidi (b) 243, no. 1 (2006): R4—R6. http://dx.doi.org/10.1002/pssb.200541427.

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17

Cao, Le, and Miao Li. "Design and Development of Cushioning Material Database Based on Cushioning Material." Applied Mechanics and Materials 416-417 (September 2013): 1681–84. http://dx.doi.org/10.4028/www.scientific.net/amm.416-417.1681.

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By directing at wide varieties and nonlinearity of cushioning characteristic curves of cushioning packaging materials, mathematical model of cushioning material curves was established on the basis of test data; JBuilder 2006 and SQL Sever2000 were utilized to develop cushioning material database. This database is equipped with data fitting, storage and management functions of various cushioning materials, which can contribute to digital management of packaging lab.

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18

Goutier, Marijn, and Thomas Vietor. "Parametric Study of Geometry and Process Parameter Influences on Additively Manufactured Piezoresistive Sensors Under Cyclic Loading." Polymers 17, no. 12 (2025): 1625. https://doi.org/10.3390/polym17121625.

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The additive manufacturing of piezoresistive sensors offers several advantages, such as the elimination of assembly or installation steps, enabling integration into complex parts precisely where desired, and compatibility with soft robotics applications. Previous studies have demonstrated that several characteristics of additively manufactured sensors, such as their resistance and sensitivity, are significantly affected by the selected printing parameters. This work seeks to further the understanding of the relationships between process parameters, material, sensor design, and the resulting se

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19

Shikula, E. "NONLENEAR DEFORMATION OF GRANULAR COMPOSITES." Collection of scientific works of the State University of Infrastructure and Technologies series "Transport Systems and Technologies", no. 36 (December 30, 2020): 121–31. http://dx.doi.org/10.32703/2617-9040-2020-36-13.

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The model of nonlinear deformation of a layered material with physically nonlinear layers is proposed. The laminate is considered a two-component material with random layers. The basis is the stochastic differential equations of the physically nonlinear theory of elasticity L.P. Khoroshun. The solution to the problem of the stress-strain state and effective properties of the composite material is constructed by the averaging method. An algorithm for determining the effective deformable properties of a layered material with physically nonlinear layers has been developed. The solution of nonline

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20

Shikula, Olena, and Nataliia Zhukova. "The model of nonlinear deformation of layered materials." International Scientific and Technical conference "The Progressive Technics, Technology and Engineering Education", no. XXIII (June 6, 2023): 37–40. http://dx.doi.org/10.20535/2409-7160.2023.xxiii.279027.

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 The model of nonlinear deformation of a layered material with physically nonlinear layers is proposed. The laminate is considered a two-component material with random layers. The basis is the stochastic differential equations of the physically nonlinear theory of elasticity by L.P. Khoroshun. The solution to the problem of the stress-strain state and effective properties of the composite material is constructed by the averaging method. An algorithm for determining the effective deformable properties of a layered material with physically nonlinear layers has been developed. The solution

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21

Dong, Xiao Mei. "Instability Analysis of High Pier of Continuous Rigid Frame Bridges." Applied Mechanics and Materials 178-181 (May 2012): 1989–93. http://dx.doi.org/10.4028/www.scientific.net/amm.178-181.1989.

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The linear and nonlinear stability of continuous rigid frame bridge with thin-wall piers is analyzed by using the current FEM software. Linear stability analysis indicates that coefficient of stability in cantilever stage is poorest. Two aspects are included in nonlinear stability analysis. The first one, only geometric nonlinearity is considered and the other one, geometric nonlinearity and material nonlinearity are considered simultaneously. The results show that material nonlinearity is a factor to stability coefficient that can not be overlooked. Considered the dual non-linearity, the stab

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22

Ulhe, Dr Prashant N. "Exploring FEA Techniques for Bending Rectangular Glass Plates into Parabolic Shapes." International Journal for Research in Applied Science and Engineering Technology 12, no. 9 (2024): 997–1000. http://dx.doi.org/10.22214/ijraset.2024.64297.

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Abstract: A structural Finite Element Analysis (FEA) was conducted, incorporating both linear and nonlinear analysis. The investigation considered geometric nonlinearity, material nonlinearity, and boundary nonlinearity, also known as contact analysis. All boundary conditions, loadings, and material properties used in the analysis were based on real-world conditions. Experimental validations were performed to confirm the accuracy of the FEA results, providing strong confidence in the investigation's findings.

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23

Klaerner, Matthias, Mario Wuehrl, Lothar Kroll, and Steffen Marburg. "Amplitude-Dependent Damping: Experimental Determination and Functional Interpretation for Metal–Plastic Composites." International Journal of Structural Stability and Dynamics 19, no. 05 (2019): 1941001. http://dx.doi.org/10.1142/s0219455419410013.

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Composite materials offer a high freedom of design with regard to stiffness, strength and damping. In contrast to efficient anisotropic but linear material models, these composites often tend to react nonlinearly. Commonly, such nonlinear material damping models imply frequency and temperature dependency. In addition, some materials show a substantial amplitude sensitivity of the damping. Within this study, metal–plastic composites with highly dissipating shear sensitive cores have been used to experimentally determine the damping values with varying amplitudes. The results show a significance

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24

Park, Junpil, Jeongseok Choi, and Jaesun Lee. "A Feasibility Study for a Nonlinear Guided Wave Mixing Technique." Applied Sciences 11, no. 14 (2021): 6569. http://dx.doi.org/10.3390/app11146569.

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Ultrasonic non-destructive testing is an effective means of examining objects without destroying them. Among such testing, ultrasonic nonlinear evaluation is used to detect micro-damage, such as corrosion or plastic deformation. In terms of micro-damage evaluation, the data that comes from amplitude comparison in the frequency domain plays a significant role. Its technique and parameter are called ultrasonic nonlinear technique and nonlinearity. A certain portion of nonlinearity comes from the equipment system, while the other portion of nonlinearity comes from the material. The former is syst

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25

Lee, Chae-Been, and Jin-Ho Lee. "Nonlinear Dynamic Response of a Concrete Rectangular Liquid Storage Tank on Rigid Soil Subjected to Three-Directional Ground Motion." Applied Sciences 11, no. 10 (2021): 4688. http://dx.doi.org/10.3390/app11104688.

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The dynamic responses of a concrete rectangular liquid storage tank on the surface of rigid soil subjected to three-directional earthquake ground motion are investigated with material nonlinearity taken into consideration. Material nonlinearity in concrete is considered using the concrete damage plasticity model. The hydrodynamic pressure due to earthquake ground motion is considered using a finite-element solution of the governing equation for an inviscid and incompressible ideal fluid with the fluid–structure interaction taken into consideration. It was observed from the dynamic analyses tha

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26

Kosaka, Shintaro, and Masatoshi Shimoda. "2503 Shape Optimization Method of Shell Structures Concerned with Material Nonlinearity and Geometrical Nonlinearity." Proceedings of Design & Systems Conference 2015.25 (2015): _2503–1_—_2503–10_. http://dx.doi.org/10.1299/jsmedsd.2015.25._2503-1_.

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27

Fulton, Chandler C., and Huajian Gao. "Electrical Nonlinearity in Fracture of Piezoelectric Ceramics." Applied Mechanics Reviews 50, no. 11S (1997): S56—S63. http://dx.doi.org/10.1115/1.3101851.

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The structural reliability of piezoelectric ceramics in smart sensors and actuators is hindered by the lack of an appropriate fracture mechanics model. Recent experimental observations of their cracking behavior under combined electrical and mechanical loads contradict predictions made by the linear theory. Evidently, a fracture criterion suitable for piezoelectrics must account for material nonlinearity. Because these materials are typically mechanically brittle, we expect electrical ductility to be the dominant effect. By adopting a multiscale viewpoint, we identify a region of electrical no

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Lisabeth, Harrison. "The effect of stress and saturation on low-frequency nonlinear elasticity in geological materials." Journal of the Acoustical Society of America 153, no. 3_supplement (2023): A234. http://dx.doi.org/10.1121/10.0018749.

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Wave propagation in rocks is typically treated in seismology as a purely linear elastic phenomenon; however, evidence for nonlinear elastic behavior in geomaterials has existed for years. The degree of nonlinearity in fractured material is much greater than that in intact material, resulting in signals that are highly sensitive to the state of the fracture (stress, chemistry, fluids). Elastic nonlinearity can cause a propagating wave to distort, resulting in generation of harmonics and multiplication of waves of different frequencies. One way to exploit these behaviors is to propagate waves of

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29

Song, Weiju, Jun Xu, Xiaowei Wang, and Changjiang Liu. "Effect of Geometric Nonlinearity on Membrane Roof Stability in Air Flow." Shock and Vibration 2020 (April 9, 2020): 1–13. http://dx.doi.org/10.1155/2020/2305145.

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Membrane materials are widely used in construction engineering with small mass and high flexibility, which presents strong geometric nonlinearity in vibration. In this paper, an improved multiscale perturbation method is used to solve the aerostatics stability of membrane roofs on closed and open structures by quantifying the effect of geometric nonlinearity on the single-mode aeroelastic instability wind velocity. Results show that the critical wind velocities of two models are smaller when the geometrical nonlinearity of the membrane material is neglected. In addition, under normal wind load

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Feng, Xiu Ling, Meng Shen, Xiang Ya Kong, Jie Zhang, and Peng Fei Luo. "Study on Flexural Stiffness Reduction Factor of Reinforced Concrete Column with Equiaxial T Shaped Section." Applied Mechanics and Materials 351-352 (August 2013): 319–24. http://dx.doi.org/10.4028/www.scientific.net/amm.351-352.319.

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The reduced stiffness method had been adopted to evaluate the material nonlinearity characteristics of reinforced concrete structures to be in compliance with concrete structure standards of the United States, New Zealand and Canada. Concrete structure design code in China also accepts the reduced stiffness method as a supplementary method of considering the second-order effects problem. However, the concrete structure with specially shaped columns code of China still use amplified coefficients of eccentricity to consider nonlinearity characteristics of reinforced concrete structure with speci

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Li, Weibin, Jae-Sun Lee, and Youn-Ho Cho. "Study of Ultrasonic Nonlinearity in Heat-Treated Material." Transactions of the Korean Society of Mechanical Engineers A 34, no. 6 (2010): 751–56. http://dx.doi.org/10.3795/ksme-a.2010.34.6.751.

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Bermes, Christian, Jin-Yeon Kim, Jianmin Qu, and Laurence J. Jacobs. "Experimental characterization of material nonlinearity using Lamb waves." Applied Physics Letters 90, no. 2 (2007): 021901. http://dx.doi.org/10.1063/1.2431467.

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Liu, Chu-heng, and Sidney R. Nagel. "Sound in a granular material: Disorder and nonlinearity." Physical Review B 48, no. 21 (1993): 15646–50. http://dx.doi.org/10.1103/physrevb.48.15646.

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Zhang, Chunjun, and Xila Liu. "A Large Increment Method for Material Nonlinearity Problems." Advances in Structural Engineering 1, no. 2 (1997): 99–110. http://dx.doi.org/10.1177/136943329700100202.

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In the case of small deformation, cumulative errors and time consumption are the crux blocking the application of flow theory for material nonlinearity problems. To overcome these blockages, a new algorithm is proposed in the present paper. Different from traditional methods, the theory of generalized inverse of matrix and a new optimization approach are introduced to give full play of the force method. As one of the main advantages, parallel computation process is used to replace the step by step solution process. Time consumption are therefore reduced and cumulative errors suppressed in esse

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Rahman, Abu H. M. A., D. Y. Li, R. Xu, D. L. Chen, Qingyang Li, and Wei Li. "Nonlinearity of Material Loss Versus the Wearing Force." JOM 71, no. 12 (2019): 4274–83. http://dx.doi.org/10.1007/s11837-019-03584-8.

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Bakre, Chaitanya, and Cliff J. Lissenden. "Surface Roughness Effects on Self-Interacting and Mutually Interacting Rayleigh Waves." Sensors 21, no. 16 (2021): 5495. http://dx.doi.org/10.3390/s21165495.

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Rayleigh waves are very useful for ultrasonic nondestructive evaluation of structural and mechanical components. Nonlinear Rayleigh waves have unique sensitivity to the early stages of material degradation because material nonlinearity causes distortion of the waveforms. The self-interaction of a sinusoidal waveform causes second harmonic generation, while the mutual interaction of waves creates disturbances at the sum and difference frequencies that can potentially be detected with minimal interaction with the nonlinearities in the sensing system. While the effect of surface roughness on atte

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Ass'ad, A. I., and H. S. Ashour. "TE Magnetostatic Surface Waves in Symmetric Dielectric Negative Permittivity Material Waveguide." Advances in Condensed Matter Physics 2009 (2009): 1–5. http://dx.doi.org/10.1155/2009/867638.

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Nonlinear magnetostatic surface wave in a slab waveguide structure has been investigated. The design consisted of dielectric film between two thick nonlinear nonmagnetic negative permittivity material (NPM) layers. A dispersion relation for TE nonlinear Magnetostatic surface waves (NMSSWs) has been derived into the proposed structure and has been numerically investigated. Effective refractive index decreases with thickness and frequency increase have been found. Effective refractive index decrease with optical nonlinearity increase and switching to negative values of effective refractive index

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Rizov, V. "Delamination of Multilayered Functionally Graded Beams with Material Nonlinearity." International Journal of Structural Stability and Dynamics 18, no. 04 (2018): 1850051. http://dx.doi.org/10.1142/s0219455418500517.

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Delamination fracture in multilayered functionally graded, split cantilever beams is analyzed with account taken of the nonlinear behavior of the material. The fracture is studied analytically in terms of the strain energy release rate. The mechanical behavior of the material is described by a power-law stress–strain relation that is not symmetric for tension and compression. The beam can have an arbitrary number of vertical layers of different thickness. Each layer can have different material properties. Besides, the material in each layer is functionally graded along the layer thickness. Als

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Costa, K. D., and F. C. P. Yin. "Analysis of Indentation: Implications for Measuring Mechanical Properties With Atomic Force Microscopy." Journal of Biomechanical Engineering 121, no. 5 (1999): 462–71. http://dx.doi.org/10.1115/1.2835074.

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Indentation using the atomic force microscope (AFM) has potential to measure detailed micromechanical properties of soft biological samples. However, interpretation of the results is complicated by the tapered shape of the AFM probe tip, and its small size relative to the depth of indentation. Finite element models (FEMs) were used to examine effects of indentation depth, tip geometry, and material nonlinearity and heterogeneity on the finite indentation response. Widely applied infinitesimal strain models agreed with FEM results for linear elastic materials, but yielded substantial errors in

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Curti, G., and F. A. Raffa. "Material Nonlinearity Effects in the Stress Analysis of Conical Disk Springs." Journal of Mechanical Design 114, no. 2 (1992): 238–44. http://dx.doi.org/10.1115/1.2916937.

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The influence of material nonlinearity on the behavior of conical disk springs (Belleville springs) is investigated by means of finite element models. Both the load-deflection curve and the stress field of this kind of spring are shown to be significantly affected by the elastic-plastic behavior of the material. In particular, as far as the actual stress field is concerned, consideration of the material nonlinearity explains some apparent contradictions of well-known analytical formulations, such as the Almen-La´szlo´ theory, based on the usual assumption of linear elastic behavior of the mate

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Kroll, M. H., and R. Chesler. "Nonlinearity of high-density lipoprotein cholesterol determinations is matrix dependent." Clinical Chemistry 40, no. 3 (1994): 389–94. http://dx.doi.org/10.1093/clinchem/40.3.389.

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Abstract The majority of methods for determining high-density lipoprotein (HDL) cholesterol failed the 1991 College of American Pathologists (CAP) linearity survey (sets LN2-A, B, C). We hypothesized that they failed because of the survey material matrix. We evaluated linearity with dextran sulfate or phosphotungstate as the precipitating reagents for several methods: Ektachem; TDx; Sigma; Dimension; Cobas Fara, with Roche reagents; and the Hitachi 736, with precipitating reagents from Boehringer Mannheim Diagnostics. We tested CAP survey material, Sigma HDL-cholesterol control material, and a

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Song, Bo, Shuai Huang, Wen Shan He, and Wei Wei. "Buckling Analysis of Wind Power Tower Considering the Effect of Nonlinearity." Applied Mechanics and Materials 256-259 (December 2012): 792–95. http://dx.doi.org/10.4028/www.scientific.net/amm.256-259.792.

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Based on the 3D finite element model of the wind power tower, buckling behavior of the wind power tower in different wind directions is analyzed, and the effect considering geometry nonlinearity and considering the material and geometry nonlinearity to the buckling analysis is studied. The results show when the ratio of the radius of the tower drum and the length of the element is 18.75, the calculated precision can reach 95%. Local buckling of the wind power tower first appears, and buckling load and displacement considering the material and geometric nonlinearity reduce 52% and 58% compared

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Wang, Ji, Ming Zhong Zhang, and Xiao Li Guo. "Nonlinear Stability Analysis on the Concrete Casting Step of Long-Span Concrete-Filled Steel Tube Arch Bridge." Materials Science Forum 614 (March 2009): 275–82. http://dx.doi.org/10.4028/www.scientific.net/msf.614.275.

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In recent years, concrete-filled steel tube (CFST) was developed and used extensively in civil engineering in China. In this paper, the method for stability analysis of long-span CFST arch bridge was introduced. Based on Jingyang River Bridge in Hubei province of China and finite element method, the spatial model was set up. Both linear and nonlinear stability of long-span CFST arch bridge in construction process were analyzed. The result indicated the influence of geometrical nonlinearity was small and the influence of material nonlinearity was evident. So, for analyzing the stability of long

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DAI, HUI-HUI, and FAN-FAN WANG. "ANALYTICAL SOLUTIONS FOR THE POST-BUCKLING STATES OF AN INCOMPRESSIBLE HYPERELASTIC LAYER." Analysis and Applications 10, no. 01 (2012): 21–46. http://dx.doi.org/10.1142/s0219530512500029.

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In this paper, we study the buckling of an incompressible hyperelastic rectangular layer due to compression with sliding end conditions. The combined series-asymptotic expansions method is used to derive two-coupled nonlinear ordinary differential equations (ODEs) governing the leading order of the axial strain W and shear strain G. Linear analysis yields the critical stress values of buckling. For the nonlinearly coupled system, by introducing a small parameter, the approximate analytical solutions for post-buckling deformations are obtained by using the method of multiple scales. The amplitu

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Li, Mengmeng, Alexey Lomonosov, Zhonghua Shen, et al. "Monitoring of Thermal Aging of Aluminum Alloy via Nonlinear Propagation of Acoustic Pulses Generated and Detected by Lasers." Applied Sciences 9, no. 6 (2019): 1191. http://dx.doi.org/10.3390/app9061191.

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Nonlinear acoustic techniques are established tools for the characterization of micro-inhomogeneous materials with higher sensitivity, compared to linear ultrasonic techniques. In particular, the evaluation of material elastic quadratic nonlinearity via the detection of the second harmonic generation by acoustic waves is known to provide an assessment of the state variation of heat treated micro-structured materials. We report on the first application for non-destructive diagnostics of material thermal aging of finite-amplitude longitudinal acoustic pulses generated and detected by lasers. Fin

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Sun, Wei, Ying Liu, and Guangyu Du. "Analytical Modeling of Hard-Coating Cantilever Composite Plate considering the Material Nonlinearity of Hard Coating." Mathematical Problems in Engineering 2015 (2015): 1–14. http://dx.doi.org/10.1155/2015/978392.

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Due to the material nonlinearity of hard coating, the coated structure produces the nonlinear dynamical behaviors of variable stiffness and damping, which make the modeling of hard-coating composite structure become a challenging task. In this study, the polynomial was adopted to characterize this material nonlinearity and an analytical modeling method was developed for the hard-coating composite plate. Firstly, to relate the hard-coating material parameters obtained by test and the analytical model, the expression of equivalent strain of composite plate was derived. Then, the analytical model

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Sun, Shuang Shuang, and Xian Ce Jiang. "Nonlinear Analysis of Actuation Performance of NiTi/Si Composite Film." Applied Mechanics and Materials 437 (October 2013): 572–76. http://dx.doi.org/10.4028/www.scientific.net/amm.437.572.

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The NiTi shape memory alloy (SMA) composite film with Si substrate subjected to thermal loads was modeled by the method of mechanics of materials. The governing equation was obtained by combining static equilibrium equations, geometric and physical equations. Both the material nonlinearity of SMA and the geometric nonlinearity of bending deformation of SMA composite film were considered. By simulating the actuation performance of the SMA composite film during a cooling-heating thermal cycle, it is found that the final cooling temperature and the thickness of SMA film have significant effects o

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Broadbridge, P., and P. J. Banksa. "Exact nonlinear solution for constant-rate expression from material of finite thickness." Journal of the Australian Mathematical Society. Series B. Applied Mathematics 33, no. 4 (1992): 430–50. http://dx.doi.org/10.1017/s0334270000007153.

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AbstractWe present new exact solutions for the flow of liquid during constant-rate expression from a finite thickness of liquid-saturated porous material with nonlinear properties. By varying a single nonlinearity parameter and a dimensionless expression rate, we systematically investigate the effect of nonlinearity and of an impermeable barrier (e.g. a piston). We illustrate the water profile shape and the water ratio deficit at the expression surface (e.g. a filter membrane) as a function of time.

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Liu, Gui Rong, Fu Lai Qu, Yu Pu Song, and Chang Yong Li. "Numerical Study of the Behavior of Reinforced Concrete Shear Walls during Fire Exposure." Applied Mechanics and Materials 101-102 (September 2011): 644–47. http://dx.doi.org/10.4028/www.scientific.net/amm.101-102.644.

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A simple method based on the well-known sectional analysis approach is presented to trace the structural behavior of reinforced concrete (RC) shear walls exposed to fire. It is similar to the approaches described in the existing literature but it does not require computations of moment-curvature curve group. This method can take into account material nonlinearity by use of the coupling constitutive relation of materials. Moreover, the geometric nonlinearity is considered by taking account the second-order effect of axial forces. The predictions of the proposed method are validated using experi

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Wang, Shi Gang, Yue Qiang Yu, and Xi Bing Li. "Research on the Numerical Simulation Technology in the Cutting Process of Aluminum 2024-T3." Applied Mechanics and Materials 151 (January 2012): 383–87. http://dx.doi.org/10.4028/www.scientific.net/amm.151.383.

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Metal cutting is a very complex process of plastic deformation, and chip formation is a typical problem of large deformation, which involves the material nonlinearity, geometric nonlinearity and nonlinear state changes. Strain hardening model of Al 2024-T3 material is established based on elastic-plastic theory of material deformation. Finite element method is used in the analysis of the established model by ALGOR. The distribution of equivalent stress, yield stress and equivalent strain is concluded concretely in the metal cutting process in this paper.

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