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Journal articles on the topic 'Instantaneous strain'

Author: Grafiati

Published: 25 May 2024

Last updated: 31 July 2025

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1

Gao, Li Lan, Xu Chen, and Hong Gao. "Creep-Recovery Behaviors of Anisotropic Conductive Adhesive Film with Temperature and Hygrothermal Aging." Advanced Materials Research 509 (April 2012): 16–21. http://dx.doi.org/10.4028/www.scientific.net/amr.509.16.

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The effects of temperature, stress level and hygrothermal aging on the creep-recovery behaviors of anisotropic conductive adhesive film (ACF) were investigated experimentally using a dynamic mechanical analyzer (DMA). It is found that the initial strains, instantaneous strains, and creep or recovery rates increase with increasing temperature，however decrease with increasing hygrothermal aging time. The change of creep or recovery rates at low temperature is apparent, however the creep or recovery rates increase obviously at temperatures above 25 oC with increasing stress level. For the hygroth

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2

Wang, Xingkai, Leibo Song, Caichu Xia, Guansheng Han, and Zheming Zhu. "Nonlinear Elasto-Visco-Plastic Creep Behavior and New Creep Damage Model of Dolomitic Limestone Subjected to Cyclic Incremental Loading and Unloading." Sustainability 13, no. 22 (2021): 12376. http://dx.doi.org/10.3390/su132212376.

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For many rock engineering projects, the stress of surrounding rocks is constantly increasing and decreasing during excavating progress and the long-term operation stage. Herein, the triaxial creep behavior of dolomitic limestone subjected to cyclic incremental loading and unloading was probed using an advanced rock mechanics testing system (i.e., MTS815.04). Then, the instantaneous elastic strain, instantaneous plastic strain, visco-elastic strain, and visco-plastic strain components were separated from the total strain curve, and evolutions of these different types of strain with deviatoric s

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3

Dvorak, G. J. "Thermal Expansion of Elastic-Plastic Composite Materials." Journal of Applied Mechanics 53, no. 4 (1986): 737–43. http://dx.doi.org/10.1115/1.3171852.

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Exact relationships are derived between instantaneous overall thermal stress or strain vectors and instantaneous overall mechanical stiffness or compliance, for two binary composite systems in which one of the phases may deform plastically. Also, the local instantaneous thermal strain and stress concentration factors are related in an exact way to the corresponding mechanical concentration factors. The results depend on instantaneous thermoelastic constants and volume fractions of the phases. They are found for fibrous composites with two distinct elastically isotropic or transversely isotropi

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4

Wu, Jin Ting, Fen Ye, and Yin Ting Wu. "Analysis on Three-Direction Strain of Asphalt Pavement Structure Based on Accelerated Pavement Testing." Advanced Materials Research 255-260 (May 2011): 3426–31. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.3426.

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The internal mechanical response of asphalt pavement structure is difficult to be obtained because of the limitations of theoretical calculation and present testing methods. In order to get practical information of instructure layers, this paper analyzed the cumulative and instantaneous strains of layers’ bottom of semi-rigid base asphalt pavement based on Accelerated Pavement Testing and Fiber Bragg Grating sensors, as well as got the spatial distribution and time-variation law of longitudinal, lateral and vertical strain responses under controlled loading condition. The research result shows

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5

Diab, Mazen, Teng Zhang, Ruike Zhao, Huajian Gao, and Kyung-Suk Kim. "Ruga mechanics of creasing: from instantaneous to setback creases." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 469, no. 2157 (2013): 20120753. http://dx.doi.org/10.1098/rspa.2012.0753.

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We present mechanics of surface creasing caused by lateral compression of a nonlinear neo-Hookean solid surface, with its elastic stiffness decaying exponentially with depth. Nonlinear bifurcation stability analysis reveals that neo-Hookean solid surfaces can develop instantaneous surface creasing under compressive strains greater than 0.272 but less than 0.456. It is found that instantaneous creasing is set off when the compressive strain is large enough, and the longest-admissible perturbation wavelength relative to the decay length of the elastic modulus is shorter than a critical value. A

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6

Song, Yongjun, Leitao Zhang, Huimin Yang, Jianxi Ren, and Yongxin Che. "Experimental Study on the Creep Behavior of Red Sandstone under Low Temperatures." Advances in Civil Engineering 2019 (October 9, 2019): 1–9. http://dx.doi.org/10.1155/2019/2328065.

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In cold regions, the deformation characteristics and long-term mechanical properties of rocks under low-temperature conditions are considerably different from those in other regions. To study the deformation characteristics and long-term mechanical properties of rocks in a low-temperature environment and the effect of different temperatures, we perform a multilevel loading-unloading uniaxial creep test on red sandstone samples and obtain the creep curves at different temperatures (20°C, −10°C, and −20°C). The results demonstrate that the total strain at each temperature can be divided into ins

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7

Tanaka, Nobuyuki, and Tetsuyuki Kigata. "Instantaneous strain recovery elasticity of polypropylene films." Sen'i Gakkaishi 47, no. 1 (1991): 1–4. http://dx.doi.org/10.2115/fiber.47.1.

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8

Yu, Li, Jian Ping Chen, and Wei Zheng. "Wavelet Denoising Analysis of Rock’s Stress-Strain Curve under Uniaxial Compression." Applied Mechanics and Materials 368-370 (August 2013): 1843–47. http://dx.doi.org/10.4028/www.scientific.net/amm.368-370.1843.

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Rock stress-strain curve under uniaxial compression is the output of joint action of rock and test system, so it must have certain noise. In order to realize effective denoising processing, the concept of instantaneous deformation modulus has been put forward, and the difference quotient algorithm of instantaneous deformation modulus has been used to enhance noise. After wavelet analysis and wavelet packet analysis of rock stress consequence and instantaneous deformation modulus respectively, the results of different denoising schemes have been statistically analyzed, this analysis shows that

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9

Alqahtani, Fahad K., and Idrees Zafar. "Evaluating the creep behaviour of plastic-processed aggregate-based concrete." Materials Science-Poland 43, no. 1 (2025): 51–66. https://doi.org/10.2478/msp-2024-0052.

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Abstract In this study, the mechanical and creep characteristics of concrete integrating the plastic-processed aggregates (PPAs) were evaluated. A constant water-to-cement ratio was used with PPAs that were incorporated at 25, 50, 75 and 100% to formulate the concrete mixes. The mixing of PPAs in concrete has resulted in a decrease in mainstream mechanical properties, including dry density, compressive strength, splitting tensile strength, flexural strength, and modulus of elasticity by 18.6, 27.8, 37.2, 26.4, and 63.6%, respectively, at 100% aggregate replacement. The instantaneous creep stra

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10

Fu, Chunyu, Dawei Tong, and Yuyang Wang. "Assessing the Instantaneous Stiffness of Cracked Reinforced Concrete Beams Based on a Gradual Change in Strain Distributions." Advances in Materials Science and Engineering 2020 (February 27, 2020): 1–10. http://dx.doi.org/10.1155/2020/7453619.

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Concrete cracking causes a gradual change in strain distributions along the cross section height of reinforced concrete beams, which will finally affect their instantaneous stiffness. A method for assessing the stiffness is proposed based on the gradual change, which is considered through modeling different strain distributions for key sections in cracked regions. Internal force equilibria are adopted to find a solution to top strains and neutral axes in the models, and then the inertias of the key sections are calculated to assess the beam stiffness. The proposed method has been validated usi

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11

Koyankin, A. A., V. M. Mitasov, I. Ya Petuhova, and T. A. Tshay. "STRESS-STRAIN STATE OF PREFABRICATED MONOLITHIC BENDING ELEMENT AT GRADUAL INSTALLATION AND LOADING." Vestnik Tomskogo gosudarstvennogo arkhitekturno-stroitel'nogo universiteta. JOURNAL of Construction and Architecture, no. 6 (December 29, 2019): 101–14. http://dx.doi.org/10.31675/1607-1859-2019-21-6-101-114.

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The stress-strain state of the prefabricated monolithic element depends on its gradual installation and loading. Regulatory documents of the Russian Federation indicate the need to calculate precast-monolithic structures for two stages of construction: before and after the specified monolithic concrete strength acquired. In this case, the stress-strain state that appeared in the prefabricated elements before the specified monolithic concrete strength should be considered. However, the construction and loading stages at issue and accumulation of stresses and strains are not disclosed in the reg

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12

Yue, Shaofei, Kai Wang, Xiaoqiang Zhang, Tianhe Kang, Jianbing Yan, and Yulong Jiang. "Creep and Hardening Characteristics of Anthracite under Graded Static–Dynamic Coupled Loading." Applied Sciences 13, no. 19 (2023): 10648. http://dx.doi.org/10.3390/app131910648.

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Remaining coal pillars in remining areas exhibit clear creep characteristics, and dynamic pressure accelerates their instability and failure. The creep and hardening characteristics of coal under dynamic pressure are of great engineering significance for the stability of remaining coal pillars in remining areas and their control. To investigate the creep and hardening characteristics of anthracite under static–dynamic coupled loading, graded loading creep tests with different loading rates were conducted. In this research, the creep strain, instantaneous elastic modulus, and creep rate of anth

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13

Blake, Erik, Garry K. C. Clarke, and Marc C. Gérin. "Tools for examining subglacial bed deformation." Journal of Glaciology 38, no. 130 (1992): 388–96. http://dx.doi.org/10.3189/s0022143000002264.

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AbstractDeformation beneath soft-bedded glaciers may be a physical mechanism that contributes to flow instabilities such as surging. If the role of bed deformation is to be understood, a rheological description is required, but the development of a rheology is hampered by a lack of in situ stress and strain measurements. In this paper, we describe four techniques for measuring subglacial strain. Three of these give continuous strain measurements, a capability that permits calculation of instantaneous strain rates and allows comparison of strain data with other time series. To demonstrate the p

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Blake, Erik, Garry K. C. Clarke, and Marc C. Gérin. "Tools for examining subglacial bed deformation." Journal of Glaciology 38, no. 130 (1992): 388–96. http://dx.doi.org/10.1017/s0022143000002264.

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Abstract Deformation beneath soft-bedded glaciers may be a physical mechanism that contributes to flow instabilities such as surging. If the role of bed deformation is to be understood, a rheological description is required, but the development of a rheology is hampered by a lack of in situ stress and strain measurements. In this paper, we describe four techniques for measuring subglacial strain. Three of these give continuous strain measurements, a capability that permits calculation of instantaneous strain rates and allows comparison of strain data with other time series. To demonstrate the

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15

Jia, Jinglong, Fenghai Yu, Yunliang Tan, and Xuepeng Gao. "Experimental Investigations on Rheological Properties of Mudstone in Kilometer-Deep Mine." Advances in Civil Engineering 2021 (January 23, 2021): 1–12. http://dx.doi.org/10.1155/2021/6615379.

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The soft rock roadway in deep high-stress environment has the problems of strong rheology and large deformation. Based on the analysis of the stress distribution of the surrounding rock of the roadway in a kilometer-deep mine, rheological tests under different stress paths are carried out for mudstone in a kilometer-deep mine. The rheological deformation curve, damage characteristics, and change rule of the main mechanical parameters of mudstone under different stress conditions are studied. The results show the following: (1) the peak strength of the triaxial compression of mudstone is closel

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16

Zhao, Rong Guo, and Wen Bo Luo. "Time-Dependent Mechanical Behaviors of Polyamide 6/Nano-SiO₂ Composite." Key Engineering Materials 368-372 (February 2008): 1080–83. http://dx.doi.org/10.4028/www.scientific.net/kem.368-372.1080.

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The uniaxial tension under various strain rates, creep under various sustained loads, and equalamplitude- strain loading and unloading tests are carried out at room temperature with polyamide 6/nano- SiO2 composite specimens. According to the elasticity recovery correspondence principle, the recovered elastic stresses (strains) in the case of prescribed strain (stress) history are calculated, and the instantaneous elastic constitutive equations are deduced. The nonlinear viscoelastic constitutive relations in single integral form on the basis of the instantaneous elastic constitutive equations

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17

Karimi, E., A. Zarei-Hanzaki, M. H. Pishbin, H. R. Abedi, and P. Changizian. "Instantaneous strain rate sensitivity of wrought AZ31 magnesium alloy." Materials & Design 49 (August 2013): 173–80. http://dx.doi.org/10.1016/j.matdes.2013.01.068.

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18

Motriuk, Roman W., and Timothy Schmidt. "Rapid, Wide-Field Measurements of Complex Transient Shell Vibrations." Journal of Pressure Vessel Technology 123, no. 4 (2001): 537–43. http://dx.doi.org/10.1115/1.1388286.

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The mapping and evaluation of complex vibrational fields is often highly desirable in the pressure vessel and piping industry. It is also tedious and expensive using conventional technology such as strain gage and accelerometer arrays. This paper describes field and laboratory measurements made with a portable pulsed laser system that instantaneously captures displacement data over areas up to 2 m2, with submicron sensitivity. The results indicate that pulsed holographic or electronic speckle interferometry facilitates the evaluation of nonstationary vibrational fields with significant advanta

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19

Zhang, Wu Lian, Xin Ding, and Xu Dong Yang. "A Plastic Deformation Behaviour of PVC Coated Plain Weave Membrane under Relaxation Condition." Applied Mechanics and Materials 71-78 (July 2011): 3379–84. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.3379.

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To recognize the interrelationship of plastic deformation with strain and time, uniaxial tension relaxation experiments of PVC coated plain weave membrane were executed along the warp and weft direction, while plastic deformation of the specimen were measured in 1 year. Using multiple functions from the product of both the strain difference (strain- critical strain) power function and the time power function, the experimental data was studied on a multiple regression analysis. It was concluded that the model had better fitting results. At the same time, an instantaneous plastic and a relaxed p

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20

Yang, Sheng-Qi, Jin-Zhou Tang, and Derek Elsworth. "Creep Rupture and Permeability Evolution in High Temperature Heat-Treated Sandstone Containing Pre-Existing Twin Flaws." Energies 14, no. 19 (2021): 6362. http://dx.doi.org/10.3390/en14196362.

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Utilizing underground coal gasification cavities for carbon capture and sequestration provides a potentially economic and sustainable solution to a vexing environmental and energy problem. The thermal influence on creep properties and long-term permeability evolution around the underground gasification chamber is a key issue in UCG-CCS operation in containing fugitive emissions. We complete multi-step loading and unloading creep tests with permeability measurement at confining stresses of 30 MPa on pre-cracked sandstone specimens thermally heat-treated to 250, 500, 750 and 1000 °C. Observation

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21

Hesebeck, Olaf. "Transformation of Test Data for the Specification of a Viscoelastic Marlow Model." Solids 1, no. 1 (2020): 2–15. http://dx.doi.org/10.3390/solids1010002.

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The combination of hyperelastic material models with viscoelasticity allows researchers to model the strain-rate-dependent large-strain response of elastomers. Model parameters can be identified using a uniaxial tensile test at a single strain rate and a relaxation test. They enable the prediction of the stress–strain behavior at different strain rates and other loadings like compression or shear. The Marlow model differs from most hyperelastic models by the concept not to use a small number of model parameters but a scalar function to define the mechanical properties. It can be defined conven

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22

Zhu, Shuai, Yong Lin Kang, Kang Kang Ren, and Sheng Ci Li. "Effect of Partitioning Temperature on Work Hardening Behavior of Q&P Steels." Advanced Materials Research 299-300 (July 2011): 403–7. http://dx.doi.org/10.4028/www.scientific.net/amr.299-300.403.

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Study on the instantaneous n-value of 0.3C-1.5Mn-1.5Si steel subjected to 1-step quenching and partitioning process (Q&P) is presented. The result indicated that the curves of instantaneous n-value vs. true strain could be divided into three stages. First, the instantaneous n-value shows a rapid decrease, then a comparative stable stage was observed due to the TRIP phenomenon of retained austenite, at last the instantaneous n-value decreases sharply to zero when necking appearance. The relationship of instantaneous n-value and partitioning temperature (PT) was analyzed; n-value decreased a

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23

Detournay, E., and A. H.-D. Cheng. "Poroelastic Solution of a Plane Strain Point Displacement Discontinuity." Journal of Applied Mechanics 54, no. 4 (1987): 783–87. http://dx.doi.org/10.1115/1.3173117.

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The plane strain fundamental solution of an instantaneous and a continuous point displacement discontinuity is presented in this paper. These solutions, together with the one of a fluid source, are obtained on the basis of a decomposition technique proposed by Biot, which separates the displacement field into a time independent part satisfying an elasticity equation, and an irrotational part governed by a diffusion equation. We begin the derivation by presenting a continuous edge dislocation. The continuous point displacement discontinuity is obtained by differentiating, along the direction of

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24

Yoon, Ra Young. "ULTRA SOUND SYSTEM FOR FORMING STRAIN IMAGES WITH INSTANTANEOUS FREQUENCY." Journal of the Acoustical Society of America 131, no. 3 (2012): 2353. http://dx.doi.org/10.1121/1.3696851.

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25

Yang, Dengke, Xiaoxiao Duan, Keyan Cheng, Lijun Xie, and Yongjun Song. "Research on creep characteristics of double fractured rock under freeze-thaw action." PLOS One 20, no. 5 (2025): e0320194. https://doi.org/10.1371/journal.pone.0320194.

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Open rock masses are subject to prolonged loading and freeze-thaw cycles in cold regions. In this study, we take saturated fissured red sandstone as object to investigate the long-term mechanical response characteristics of fractured rock under freeze-thaw conditions. Experimental tests were conducted to analyze the creep characteristics of the rock after freeze-thaw cycles, considering different freeze-thaw frequencies and fracture orientations. The results reveal that (1) freeze-thaw cycles exert a significant influence on the rock’s creep behavior, with axial strain, instantaneous strain, a

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26

Guo, Yi Peng, Xiao Nan Wang, Zheng Fa Lai, and Jun Qing Lv. "Analysis on Rheological Properties of Peat Soil in Kunming Area." Applied Mechanics and Materials 204-208 (October 2012): 722–26. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.722.

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Kunming area is adjacent to Dianchi Lake. Peat soil with high water content and high compressibility is widely distributed, rheological properties is one of the most important engineering properties of peat soil. However, compared with the peat soils in the other areas, the peat soil in Kunming area has different properties. This paper studied rheological properties of peat soil in Kunming area by using the creep test of loading and unloading, on the basis of the strain-time curves, parting linear visco-elasticity, linear visco-plasticity and nonlinear visco-plasticity from the total deformati

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27

Hu, Y., and R. Feng. "On the Use of a Kolsky Torsion Bar to Study the Transient Large-Strain Response of Polymer Melts at High Shear Rates." Journal of Applied Mechanics 71, no. 4 (2004): 441–49. http://dx.doi.org/10.1115/1.1756142.

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A Kolsky torsion bar is utilized successfully in a novel rheometric experiment for measuring the transient large-strain response of polymer melts under high shear-rate loading. A molten low-density polyethylene is studied with the new technique. The results show that the high-rate shear response of the material has an instantaneous rate dependence that may not be discernible at low rates and a strain-dependent hardening that saturates at large strains instead of fading. The usefulness of the technique and the significance of the findings are discussed in comparison with a modified rubberlike l

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Jeong, Hyo-Tae, Seung-Hyun Hong та Dong Nyung Lee. "Variation of Plastic Strain Ratios of α-Brass Sheet With Tensile Strain". Textures and Microstructures 32, № 1-4 (1999): 355–67. http://dx.doi.org/10.1155/tsm.32.355.

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A study has been made of the changes in the instantaneous plastic strain ratios along various directions of α-brass sheet as a function of tensile strain. The α-brass sheet was fabricated by 88% cold rolling and subsequent annealing at 450℃ for 1.5 h, which lead to complete recrystallization. The recrystallization texture of the α-brass sheet could be approximated by {110} 〈110〉. The plastic strain ratio along the rolling direction decreased with increasing tensile strain, whereas those along 45 90 to the rolling direction were almost independent of tensile strain. The results were in agreemen

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29

Zhang, Hua Bin, Zhi Yin Wang, and Ji Wei Ma. "A 3-Dimensional Model Related to Stress-Strain-Time of Rock Salts." Key Engineering Materials 525-526 (November 2012): 245–48. http://dx.doi.org/10.4028/www.scientific.net/kem.525-526.245.

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To build a stress-strain-time relationship of salt rock with unified instantaneous law and creep law, we combine the stress-strain curve with whole process of creep curve, looking for inner relation between softening curve and creep deformation. Finally, the stress-strain-time space surface is obtained. The researching results demonstrated that time and space development law of rock salts can be well reflected by it.

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Borra, Naga Venkata Srinivas, and Veera Venkata Krishna Prasad Davuluri. "Experimental Investigations of Al-Cr3C2 Composite Preform Densification and Deformation." Annales de Chimie - Science des Matériaux 46, no. 4 (2022): 185–92. http://dx.doi.org/10.18280/acsm.460403.

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This investigation on strain hardening, densification and workability of the Sintered aluminium- Chromium Carbide composition of (Al-Cr3C2 of 2, 4 and 6%) preforms subjected to upsetting were investigated in this research. Industrial practitioners needed the workability data and densification mechanisms to plan and envisage the failure strains. In the current study, under triaxial stress state conditions Al-Cr3C2 preform with primary preform densities and various aspect ratios were compressed. Strain hardening, densification behaviors of aluminium- Chromium Carbide be investigated by gradually

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31

Huang, Shaoqin, Lifeng Luan, Wanli Xing, and Qunyi Liu. "Instantaneous Rock Blasting Wave and Its Microscopic Characteristics during Interaction with Concrete." Shock and Vibration 2015 (2015): 1–6. http://dx.doi.org/10.1155/2015/318286.

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This paper uses improved technology for dynamic strain measurement to investigate the dynamic strain signals of blasting wave action tested in the range of 8–16 cm from the central blast. Based on the blasting mechanism and on the analysis of signal characteristics, blasting waves are recognized and divided into three zones, namely, shock wave zone, stress wave zone, and gas-expanding zone. This paper studies the relationships between stress, strain, and time of every zone. The tensile and compressive stresses of stress wave are considered. After the blasting test, four cracks from the borehol

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32

Ghannadpour, S. A. M., A. Kurkaani Barvaj, and H. R. Ovesy. "Predicting the Nonlinear Damage Response of Imperfect Laminates Using Linear Material Degradation Model and a Semi-Analytical Technique." International Journal of Structural Stability and Dynamics 21, no. 10 (2021): 2150141. http://dx.doi.org/10.1142/s0219455421501418.

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This paper investigates nonlinear damage response and ultimate collapse of laminates under in-plane and lateral pressure loadings. The in-plane loading was in the form of end-shortening strain, while the lateral pressure was sinusoidal. The plates had initial geometric imperfection to which simply-supported boundary conditions were applied. Ritz techniques with nonlinear strain terms in kinematic relations as well as the first-order shear deformation theory were applied. Hashin and Rotem failure criteria were used for failure analysis. Two models were also employed for degradation of material

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Kemao, Qian, Seah Hock Soon, and Anand Asundi. "Instantaneous frequency and its application to strain extraction in moire interferometry." Applied Optics 42, no. 32 (2003): 6504. http://dx.doi.org/10.1364/ao.42.006504.

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GANAPATHISUBRAMANI, B., K. LAKSHMINARASIMHAN, and N. T. CLEMENS. "Investigation of three-dimensional structure of fine scales in a turbulent jet by using cinematographic stereoscopic particle image velocimetry." Journal of Fluid Mechanics 598 (February 25, 2008): 141–75. http://dx.doi.org/10.1017/s0022112007009706.

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Cinematographic stereoscopic particle image velocimetry measurements were performed to resolve small and intermediate scales in the far field of an axisymmetric co-flowing jet. Measurements were performed in a plane normal to the axis of the jet and the time-resolved measurement was converted to quasi-instantaneous three-dimensional data by using Taylor's hypothesis. The quasi-instantaneous three-dimensional data enabled computation of all nine components of the velocity gradient tensor over a volume. The results based on statistical analysis of the data, including computation of joint p.d.f.s

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Moriyama, Masao, Daisuke Ushijima, and Junichi Katsuta. "Image Based Displacement Vector Estimation Method around the Fatigue Crack Tip." Key Engineering Materials 452-453 (November 2010): 341–44. http://dx.doi.org/10.4028/www.scientific.net/kem.452-453.341.

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To clarify the instantaneous strain field during the fatigue crack propagation test, an attempt is made to estimate the displacement vector of the small area of the crack tip from the high speed movie. The key theory of the estimation is Particle Image Velocimetry (PIV) which is frequently use in the fluid dynamical data analysis. PIV means the area based correlation matching between the sequential image pair. At first the earlier image divided into the small subareas, and on the later image most correspondent position to the subarea is searched. The each displacement of the subarea position b

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Rajeshkannan, Ananthanarayanan, and S. Narayan. "Phenomenon of Instantaneous Work Hardening Characteristics of Sintered Cold Deformed Cu Alloy Preforms." Advanced Materials Research 651 (January 2013): 295–301. http://dx.doi.org/10.4028/www.scientific.net/amr.651.295.

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Work hardening behavior is an important phenomenon especially when a material is subjected to cold work. The two important parameters that expose this study are strain hardening exponent, n, and strength coefficient, K, according to ludwik equation, σ=Kε^n. In addition to strain as influencing factor for work hardening behavior, the attained density during deformation is also considered in the present investigation; a rational approach and its characteristic evaluation has been proposed. Thus a copper alloy preforms of three different aspect ratios prepared using conventional powder metallurgy

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Park, I. D., Seok Hwan Ahn, and Ki Woo Nam. "Solid Solution Strengthening Behavior of 25Cr-20Ni Austenite Stainless Steel." Key Engineering Materials 261-263 (April 2004): 1209–14. http://dx.doi.org/10.4028/www.scientific.net/kem.261-263.1209.

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The purpose of this paper is to investigate the effect of solid solution strengthening on the high temperature creep strength of STS310J1TB. To make clear the effect of solid solution strengthening, the stress abrupt change test was carried out to observe the instantaneous plastic strain and the stress relaxation test was carried out to investigate the ratio of solid solution strengthening to applied stress. The instantaneous plastic strain was observed in the stress abrupt change test of STS310S, while it was absent in STS310J1TB. This clearly indicates that the dislocations glide viscously i

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Delobelle, P., and C. Oytana. "Modeling of 316 Stainless Steel (17.12 Sph.) Mechanical Properties Using Biaxial Experiments—Part I: Experiments and Basis of the Model." Journal of Pressure Vessel Technology 109, no. 4 (1987): 449–54. http://dx.doi.org/10.1115/1.3264929.

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Experimental results aimed at establishing the relationship existing between plastic instantaneous and creep strains are reported. They are chiefly tensile at constant strain rates and tensile or tensile-torsion creep experiments. Recovery and hardening are also measured. It is shown that two types of viscous behavior may occur according to whether the loading path is an active loading or an unloading. The features of these two types of viscoplastic behavior are such that they can be modeled with the same plastic state equation using a single internal variable. But according to a criterion bas

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Ren, Xiaopeng, Yajun Xin, Baoshan Jia, Kun Gao, Xuping Li, and Yu Wang. "Large Stress-Gradient Creep Tests and Model Establishment for Red Sandstone Treated at High Temperatures." Energies 15, no. 20 (2022): 7786. http://dx.doi.org/10.3390/en15207786.

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Red sandstone samples treated at high temperatures feature complex creep properties. Uniaxial compression tests and the incremental creep tests at different stress gradients were conducted on 10 red sandstone samples of the same specifications divided into five groups on an RLW-2000 triaxial servo rheometer in the laboratory. Relationships of the instantaneous strain and creep strain of red sandstone samples treated at high temperatures with the stress level were explored, and the creep properties and strength of the samples at different temperature gradients were investigated. In addition, th

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Sun, Xiaoming, Li Cui, Jiangchun Hu, and Yong Zhang. "The strain characteristics of cracked anchored soft rock under short-term creep." Journal of Geophysics and Engineering 19, no. 3 (2022): 445–56. http://dx.doi.org/10.1093/jge/gxac020.

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Abstract The short-term creep properties of cracked soft rock are the basis for analyzing and predicting the long-term deformation characteristics of engineering rock mass. Based on orthogonal test design and by means of physical testing and theoretical analysis, this paper systematically studies the short-term creep strain properties of soft rock mass with a vertical anchor form under different combinations of crack number, crack discontinuity degree and crack inclination. The results show the following: (i) as the stress increases, the growth rate of the instantaneous strain of the anchored

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Shen, Junjie, Ikeda Kenichi, Hata Satoshi, and Nakashima Hideharu. "Instantaneous creep in face-centered cubic metals at ultralow strain rates by a high-resolution strain measurement." Journal of Wuhan University of Technology-Mater. Sci. Ed. 28, no. 6 (2013): 1096–100. http://dx.doi.org/10.1007/s11595-013-0826-y.

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Oyanagi, Yasushi, and Kazuhisa Kubota. "Pressure Effects on Rheological Behavior of Melt Polymers – A Discussion in Relation to Polymer Processing." Journal of Polymer Engineering 7, no. 1 (1986): 47–76. http://dx.doi.org/10.1515/polyeng-1986-0105.

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Abstract Polymers have large bulk compressibility in the molten state /1/ and their rheological properties are largely affected by pressure applied in polymer processing. The volumetric strain induced by pressure consists of instantaneous and retarded elastic strains, both of which are proportional to pressure, and recover reversibly when pressure is removed. In many crystalline polymers, as observed by B. Maxwell for polyethylene, retarded elastic strain is large, and due mostly to pressure crystallization. This paper describes results of experimental studies relating pressure effects on rheo

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Góra, Jacek. "Instantaneous deformability of high performance concretes with crushed aggregates." Budownictwo i Architektura 9, no. 2 (2011): 077–85. http://dx.doi.org/10.35784/bud-arch.2246.

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The test results presented concern high performance concretes of the w/c ratio 0,28. There have been examined the modulus of elasticity, Poisson’s ratio and limiting strain at the highest compressive stress. The variable factor in the studies is the type of coarse aggregate: crushed basalt, dolomite and granite. The results of the research have been tested statistically – the one-way ANOVA and the LSD test. There is stated the significant influence of aggregate on the tested deformation properties of high performance concretes.

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Yamanin, A. I. "Dynamic calculation of the crankshaft stress-strain state." Proceedings of Higher Educational Institutions. Маchine Building, no. 4 (757) (April 2023): 55–61. http://dx.doi.org/10.18698/0536-1044-2023-4-55-61.

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The paper describes application of the finite element method in the explicit formulation (Explicit) for dynamic calculation of the stress-strain state of the full-size crankshaft represented by a continuous model taking into account contact interaction with the supports and the rapidly varying nature of the loading. The procedure for preparing and imposing the corresponding force boundary conditions is described. The proposed calculation method makes it possible to simultaneously determine the instantaneous values of stresses due to the incoming torques and additional stresses caused by all ty

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SCHWARZ, A. C., M. W. PLESNIAK, and S. N. B. MURTHY. "Response of turbulent boundary layers to multiple strain rates." Journal of Fluid Mechanics 458 (May 10, 2002): 333–77. http://dx.doi.org/10.1017/s0022112002007863.

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Many practical applications, such as in blade cascades and turbomachinery, involve inhomogeneous turbulent shear flows subjected simultaneously to multiple strains. In principle, the applied strain can be combined to yield an effective strain. However, no simple stress–strain relation is capable of establishing turbulent stress or energy balance in the mean or on an instantaneous basis. In the current investigation, a turbulent boundary layer is examined in the presence of convex curvatures of different strengths combined with streamwise (favourable and adverse) pressure gradients, with variou

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Pollitz, Fred F., and Mathilde Vergnolle. "Mechanical deformation model of the western United States instantaneous strain-rate field." Geophysical Journal International 167, no. 1 (2006): 421–44. http://dx.doi.org/10.1111/j.1365-246x.2006.03019.x.

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Holt, William E., Ming Li, and A. J. Haines. "Earthquake strain rates and instantaneous relative motions within central and eastern Asia." Geophysical Journal International 122, no. 2 (1995): 569–93. http://dx.doi.org/10.1111/j.1365-246x.1995.tb07014.x.

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Wallace, Matthew L., and Béla Joós. "Microstructure and dynamics of a polymer glass subjected to instantaneous shear strain." Journal of Physics: Condensed Matter 20, no. 24 (2008): 244130. http://dx.doi.org/10.1088/0953-8984/20/24/244130.

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Cheng, Shuai, Shanhua Qian, Chuanhui Huang, Zifeng Ni, and Liguo Liu. "Elastic modulus of thermoplastic elastomers investigated with the instantaneous volumetric strain method." Journal of Applied Polymer Science 136, no. 11 (2018): 47181. http://dx.doi.org/10.1002/app.47181.

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Fares, N., and G. J. Dvorak. "Finite Deformation Constitutive Relations for Elastic-Plastic Fibrous Metal Matrix Composites." Journal of Applied Mechanics 60, no. 3 (1993): 619–25. http://dx.doi.org/10.1115/1.2900849.

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This paper presents a finite strain formulation of a plasticity theory of fibrous composite materials. An additive decomposition is adopted to describe the kinematics of large deformations; a lattice is defined by the current fiber direction. Elastic and plastic constitutive relations are developed from the proposition that distortions take place relative to the fiber direction. A numerical method is proposed for integrating the constitutive equations. Finally, an illustrative example of the formulation indicates that when axial loads along the fiber direction are comparable to the instantaneo

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