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Journal articles on the topic 'Longitudinal deformation'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Chen, Zhaowei. "Evaluation of longitudinal connected track under combined action of running train and long-term bridge deformation." Journal of Vibration and Control 26, no. 7-8 (2019): 599–609. http://dx.doi.org/10.1177/1077546319889855.

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With long-term operation of high-speed railways, bridge deformation is hard to avoid, which directly affects the mechanical property of longitudinal connected track. To ensure the structural stability of longitudinal connected track and operation safety of train, this work proposes a work to evaluate longitudinal connected track under combined action of running train and long-term bridge deformation. First, the methodology of evaluating longitudinal connected track subject to train load and long-term bridge deformation has been proposed, in which an accurate train–track–bridge dynamic model an

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2

Pan, Shi Dong, Zhen Gong Zhou, and Lin Zhi Wu. "Longitudinal Shear Modulus of Honeycomb Cores Based on Shear-Compressive Model." Advanced Materials Research 773 (September 2013): 555–60. http://dx.doi.org/10.4028/www.scientific.net/amr.773.555.

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The deformation mechanism of unit cell wall is investigated by use of FEM, and the numerical simulation results show that the predominant deformations consist of shear deformation and compressive deformation. One new model based the shear deformation and the compressive deformation is put forward to investigate the longitudinal shear modulus of honeycomb cores. Owing to taking skin effect into consideration in our model, it is found that the equivalent shear modulus depends on not only the material properties and configuration parameters of cores, but also the material properties and configura

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Suzuki, Ryohei, Yohei Mochizuki, Hiroki Yoshimatsu, Takahiro Teshima, Hirotaka Matsumoto, and Hidekazu Koyama. "Determination of multidirectional myocardial deformations in cats with hypertrophic cardiomyopathy by using two-dimensional speckle-tracking echocardiography." Journal of Feline Medicine and Surgery 19, no. 12 (2017): 1283–89. http://dx.doi.org/10.1177/1098612x17691896.

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Objectives Hypertrophic cardiomyopathy, a primary disorder of the myocardium, is the most common cardiac disease in cats. However, determination of myocardial deformation with two-dimensional speckle-tracking echocardiography in cats with various stages of hypertrophic cardiomyopathy has not yet been reported. This study was designed to measure quantitatively multidirectional myocardial deformations of cats with hypertrophic cardiomyopathy. Methods Thirty-two client-owned cats with hypertrophic cardiomyopathy and 14 healthy cats serving as controls were enrolled and underwent assessment of myo

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4

Huang, Guoping, Jianhua Hu, Haibo Liu, and Xiugui Sun. "Girder Longitudinal Movement and Its Factors of Suspension Bridge under Vehicle Load." Advances in Civil Engineering 2021 (October 1, 2021): 1–14. http://dx.doi.org/10.1155/2021/1443996.

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Vehicle load may not only cause vertical deformation and vibration of suspension bridge but also lead to longitudinal deformation and vibration. And the longitudinal behavior is closely related to the durability of the girder end devices and the bending fatigue failure of suspenders. In this study, the longitudinal deformation behavior and longitudinal vibration of suspension bridge under vehicles, as well as the related influencing factors, are investigated. The underlying mechanism of girder longitudinal movement under the moving vehicles is revealed. Based on the simplified vehicle model of

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5

Lin, Wei, Pan Li, and Xiongyao Xie. "A Novel Detection and Assessment Method for Operational Defects of Pipe Jacking Tunnel Based on 3D Longitudinal Deformation Curve: A Case Study." Sensors 22, no. 19 (2022): 7648. http://dx.doi.org/10.3390/s22197648.

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Adjacent tunnel construction and environmental disturbances can lead to longitudinal deformation in pipe-jacking tunnels. The longitudinal deformation of the tunnel is closely related to the occurrence of joint dislocation, joint opening, and other defects. In view of the difficulty of obtaining 3D longitudinal deformation curves, a method is proposed to obtain 3D longitudinal deformation curves based on a large number of 3D point cloud data with high spatial resolution and large spatial dimensions. Combined with the mechanism of defects occurrence, a theoretical basis for tunnel defects asses

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6

Wang, Hao, Lun Ji, Hongju Zhang, Yuqi Lou, Linlin Xu, and Yiqiu Tan. "Indicator Construction of Road Surface Deformation Activity in Cold Regions and Its Relationship with the Distribution and Development of Longitudinal Cracks." Sustainability 15, no. 21 (2023): 15466. http://dx.doi.org/10.3390/su152115466.

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As a type of road distress in cold areas, longitudinal cracks have a high incidence and cause serious damage. The occurrence of longitudinal cracks is related to the conditions of the subgrade, pavement structure, material properties, and water temperature. The goal is to gain a deeper understanding of the occurrence mechanism of longitudinal cracks and provide references for the prevention and control of longitudinal cracks. Through the monitoring of vertical deformation, longitudinal crack distribution, and the development of typical roads in cold areas, the discrete characteristics and the

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Ma, Shuai, Xiubo Liu, Bo Zhang, and Jianmei Wei. "Differential Deformation Identification of High-Speed Railway Substructures Based on Dynamic Inspection of Longitudinal Level." Sensors 23, no. 1 (2022): 219. http://dx.doi.org/10.3390/s23010219.

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High-speed railway administrations are particularly concerned about safety and comfort issues, which are sometimes threatened by the differential deformation of substructures. Existing deformation-monitoring techniques are impractical for covering the whole range of a railway line at acceptable costs. Fortunately, the information about differential substructure deformation is contained in the dynamic inspection data of longitudinal level from comprehensive inspections trains. In order to detect potential differential deformations, an identification method, combining digital filtering, a convol

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8

Xu, Aimei, Hojatallah Azarkhosh, and Erjun Wu. "Monitoring Method of Longitudinal Land Subsidence and Deformation in Seismic Geological Disasters." Earth Sciences Research Journal 24, no. 3 (2020): 259–66. http://dx.doi.org/10.15446/esrj.v24n3.90290.

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Monitoring of longitudinal land subsidence and deformation in seismic and geological hazards plays an important role in preventing and curing land collapse, land subsidence, and ground cracks. In this paper, a distributed monitoring model experiment on vertical land subsidence and deformation of seismic and geological hazards is carried out by Brillouin optical frequency-domain analysis technology (BOTDA). By using the self-made indoor longitudinal land subsidence and deformation simulation box, different intensity seismic ground is simulated by air bag. Distributed optical fibers are used to

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9

Filippov, Dmitry, Ying Liu, Peng Zhou, et al. "Low-Frequency Magnetoelectric Effects in Magnetostrictive–Piezoelectric Bilayers: Longitudinal and Bending Deformations." Journal of Composites Science 5, no. 11 (2021): 287. http://dx.doi.org/10.3390/jcs5110287.

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A model for the low-frequency magnetoelectric (ME) effect that takes into consideration the bending deformation in a ferromagnetic and ferroelectric bilayer is presented. Past models, in general, ignored the influence of bending deformation. Based on the solution of the equations of the elastic theory and electrostatics, expressions for the ME voltage coefficients (MEVCs) and ME sensitivity coefficients (MESCs) in terms of the physical parameters of the materials and the geometric characteristic of the structure were obtained. Contributions from both bending and planar deformations were consid

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10

Safta, Voicu Ioan, and Voicu Ionel Safta. "Plastic Deformation and Fracture Initiation Typology Analysis under a Triaxial Tensile State of Stress Using the Quantitative Assessment of Microstructural Changes." Applied Mechanics and Materials 267 (December 2012): 17–24. http://dx.doi.org/10.4028/www.scientific.net/amm.267.17.

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The paper approaches the influence problems, due to increase in plastic deformation and fracture initiation, upon the multi-axial stress state. The experiments are based on determining the geometric changes of stress concentrators and the increase of granulation anisotropy of unalloyed steel related to the plastic deformation. In order to evince the changes in the concentrators shape, at high levels of deformation, an average parameter of shape was introduced. The 3D Complex representations, based on measurements have indicated the dependence of longitudinal specific deformations for the defor

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11

Liang, Wei, and Hidekazu Murakawa. "Predicting Welding Distortion in a Panel Structure with Longitudinal Stiffeners Using Inherent Deformations Obtained by Inverse Analysis Method." Scientific World Journal 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/601417.

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Welding-induced deformation not only negatively affects dimension accuracy but also degrades the performance of product. If welding deformation can be accurately predicted beforehand, the predictions will be helpful for finding effective methods to improve manufacturing accuracy. Till now, there are two kinds of finite element method (FEM) which can be used to simulate welding deformation. One is the thermal elastic plastic FEM and the other is elastic FEM based on inherent strain theory. The former only can be used to calculate welding deformation for small or medium scale welded structures d

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12

Aydin, Metin Mutlu, and Ali Topal. "EFFECT OF ROAD SURFACE DEFORMATIONS ON LATERAL LANE UTILIZATION AND LONGITUDINAL DRIVING BEHAVIOURS." TRANSPORT 31, no. 2 (2016): 192–201. http://dx.doi.org/10.3846/16484142.2016.1193049.

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Various road surface deformations generally occur on urban and rural roads due to infrastructure, superstructure deficiencies and excessive heavy vehicle loads. In addition to driver-based errors, many accidents happen due to these mentioned surface deformations. This study aims to present lateral lane utilization and longitudinal driving behaviours on a two-lane deformed road. The effect of deformation on the tendency of drivers’ lane selection, lane utilization, and the movement in traffic flow will also be determined. For this purpose, parameters such as lateral position, speed, acceleratio

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Matveeva, M. G., A. V. Ter-Akopyan, and M. N. Alekhin. "Parameters of left ventricular deformation in elderly and senile patients with aortic stenosis after transcatheter implantation of the aortic valve." Siberian Journal of Clinical and Experimental Medicine 38, no. 3 (2023): 121–27. http://dx.doi.org/10.29001/2073-8552-2023-39-3-121-127.

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Aim: To evaluate the parameters of left ventricle (LV) myocardial deformation (longitudinal, circular and radial) in patients with symptomatic severe aortic stenosis (AS) with preserved LV ejection fraction after transcatheter aortic implantation valve (TAVI) in the early postoperative period.Material and Methods. The study included 31 patients after TAVI out of 69 with symptomatic severe AS. Echocardiography (EchoCG) using two-dimensional speckle tracking technology was performed before TAVI and in the early postoperative period (within 5 ± 1,7 days).Results. There were no significant differe

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Tarasova, А. А., O. S. Groznova, and N. Yu Chernykh. "Clinical significance of myocardial deformation of a left ventricle in children with hypertrophic cardiomyopathy." Medical alphabet, no. 30 (December 3, 2024): 36–41. https://doi.org/10.33667/2078-5631-2024-30-36-41.

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Purpose: to evaluate the clinical significance of left ventricular myocardial deformation indicators, their relationship with the degree of heart failure and left ventricular hypertrophy in children with hypertrophic cardiomyopathy (HCM). Materials and methods. 61 patients with primary genetically confirmed asymmetric HCM aged 7 to 17 years underwent a comprehensive clinical and echocardiography. Echocardiography determined indicators of left ventricular systolic function: ejection and shortening fractions, global longitudinal, circular and radial myocardial deformations and deformations rates

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15

Yi, Ji-Hyun, Bum-Su Go, Yong-Hyuk Kwon, and Hee-Seon Bang. "Numerical Investigation on Reduction Characteristics of Welding Deformation According to Standoff Distance in Heat Sink Welding Process." Journal of Welding and Joining 41, no. 3 (2023): 213–20. http://dx.doi.org/10.5781/jwj.2023.41.3.11.

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Welding with a trailing heat sink process is proposed as a useful technique to reduce welding deformation without a significant loss of manufacturing efficiency. In particular, this method is effective than the existing mechanical or thermal correction method in thin plate steel structures with low stiffness. In this study, a three-dimensional thermal elastic-plastic finite element model using a 3-mm thick 304L stainless steel sheet was developed to simulate heat sink welding. The reduction characteristics of welding deformation according to the standoff distance between the welding heat sourc

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16

Wang, Chun Fang, Lian Chao Dong, and Yan Wang. "Metal Average Deformation Velocity and Forward Slip Model for Longitudinal Profiled Plate Rolling Process." Advanced Materials Research 941-944 (June 2014): 1748–51. http://dx.doi.org/10.4028/www.scientific.net/amr.941-944.1748.

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Based on the characteristics of longitudinal profiled plate rolling process, longitudinal profiled plate rolling process is a non-stable rolling process. The rule of volume flow rate has not applied to the longitudinal profiled plate rolling process. So, forward slip model and metal average deformation velocity of conventional rolling do not apply to longitudinal profiled plate rolling process. Forward slip model and metal average deformation velocity of longitudinal profiled plate rolling process are deduced by according to the definition of forward slip and metal average deformation velocity

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17

Nemirovskii, Yu V., and S. V. Tikhonov. "The limit state of concrete and reinforced concrete rods at complex and longitudinal-transverse bending." PNRPU Mechanics Bulletin, no. 1 (December 15, 2020): 60–73. http://dx.doi.org/10.15593/perm.mech/2020.1.05.

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The work considers rods with a constant cross-section. The deformation law of each layer of the rod is adopted as an approximation by a polynomial of the second order. The method of determining the coefficients of the indicated polynomial and the limit deformations under compression and tension of the material of each layer is described with the presence of three traditional characteristics: modulus of elasticity, limit stresses at compression and tension. On the basis of deformation diagrams of the concrete grades B10, B30, B50 under tension and compression, these coefficients are determined

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18

V., Dmytriv,, Dmytriv, I., and Krasnytsia, B. "Analytical model of liner with previous loads." Mehanization and electrification of agricultural, no. 9(108) (2019): 99–106. http://dx.doi.org/10.37204/0131-2189-2019-9-12.

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Purpose. Development analytical model of the liner, taking into account its previous tension, structural and technological parameters and physical-mechanical characteristics of the rubber material, for modeling its deformations in the radial, longitudinal and circular planes. Methods. Analytical, mathematical modeling. Results. On the basis of the equilibrium equations for a cylindrical shell, taking into account the isotropy of the medium and the without momentary stress state, the spatial of forces and the preliminary tension of the liner, a system of analytic equations is developed that ena

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19

Kuchmin, A. N., M. Yu Yaroslavtsev, N. V. Afendikov, et al. "Evaluation of the antiischemic effect of a prolonged form of trimetazidine in patients with stable angina pectoris using speckle-tracking technique." Bulletin of the Russian Military Medical Academy 22, no. 1 (2020): 18–22. http://dx.doi.org/10.17816/brmma25960.

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Studies of global and segmental myocardial contractility using the speckle-tracking technique in patients suffering from stable angina pectoris compared to healthy individuals are presented. It was revealed that, in patients suffering from stable angina pectoris, the values of longitudinal deformation in the anterolateral and apical segments of the left ventricle, as well as global longitudinal deformation, decrease. Differences in longitudinal myocardial deformation in other segments were not observed in the subjects. Possible causes of a decrease in the longitudinal deformation of the myocar

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20

Song, Q. Y., M. X. Zhang, W. J. Ding, H. M. Wu, and Y. C. Zhang. "Longitudinal structural behavior of shield tunnel with large diameter and small curvature." IOP Conference Series: Earth and Environmental Science 1333, no. 1 (2024): 012056. http://dx.doi.org/10.1088/1755-1315/1333/1/012056.

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Abstract The structural mechanism of a large-diameter curved tunnel is introduced in detail because no relevant calculation method is available. A longitudinal discontinuous contact model is established based on the newly built North Highway Tunnel in Shanghai, China. First, the load-spreading mechanism of circumferential joints was considered. Second, the distribution laws of the longitudinal internal force, settlement, and joint deformation of curved and straight tunnels under the same load were analyzed and compared. Finally, a model test is conducted to verify the effectiveness of the disc

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21

KHAZOV, P. A., and A. P. POMAZOV. "Experimental Study of Longitudinal and Transverse Bending of Pipe Concrete Rods." Zhilishchnoe Stroitel'stvo, no. 12 (December 2023): 66–71. http://dx.doi.org/10.31659/0044-4472-2023-12-66-71.

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The results of experimental studies of pipe-concrete rods during longitudinal and transverse bending tests, since these stress-strain states are of interest from the point of view of the operation of building structures, are presented. To carry out the experiments, several series of laboratory samples 700 mm long were made, which were steel pipes with a monolithic core made of fine-grained concrete. Diagrams of test installations are presented and methods for conducting experiments on axial compression with subsequent loss of stability and three-point bending with concentrated lateral load are

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22

Zhao, Honghua, and Yutao Song. "Study on the Influence Factors of Surrounding Tunnel Longitudinal Deformation Caused by Pit Excavation Based on Nonlinear Pasternak Modeling." Buildings 15, no. 9 (2025): 1504. https://doi.org/10.3390/buildings15091504.

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In practical engineering, it is often necessary to constructed deep pits next to tunnels. So it is crucial to evaluate surrounding tunnels deformation and stress to ensure their safe operation. Pasternak soil model that considers soil nonlinear is adopted to solve tunnel beam’s differential equation to obtain longitudinal tunnel deformation and stress. The rationality of considering soil nonlinear methods was verified by contrasting measured with calculated results. On this basis, a comparative study was conducted on the calculation and analysis of various influencing factors based on engineer

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23

Wu, C. L., Z. R. Wang, and Wen Zhang. "Research of Formation Mechanics on Nanostructured Chips by Multi-Deformations Based on Finite Element Method." Advanced Materials Research 989-994 (July 2014): 352–55. http://dx.doi.org/10.4028/www.scientific.net/amr.989-994.352.

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Formation of chip is a typical severe plastic deformation progress in machining which is only single deformation stage. The rake angle of tool is governing parameter to create large strain imposed in the chip. Effect of rake angle and deformation times on effective strain, mean strain, strain variety and strain rate imposed in the chip are researched respectively. The result of simulation have shown that the chip with large strain and better uniform of strain along the longitudinal section of chip can be produced with negative rake angle at some lower cutting velocity by multi-deformations in

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Li, Guolong, Mangmang Gao, Fei Yang, Zilong Wei, and Jingjing Yang. "Study on the threshold for superposed deformation of simply supported bridge creep and track slab upwarp in high-speed railway." Advances in Mechanical Engineering 14, no. 12 (2022): 168781322211439. http://dx.doi.org/10.1177/16878132221143913.

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Based on long-term inspection data about track geometric irregularity of 32 m-span simply supported girder bridge in China Railway High-Speed for nearly 10 years, it is found that there is continuous periodic track longitudinal level (TLL) with different wavelengths, thereinto, simply supported girder bridges creep and ballastless track slab upwarp are the primary reasons. Moreover, there are two types of variation trends for bridge creep of 32 m simply-supported bridges with ballastless track, that is, stable type and increasing type, and the maximum [Formula: see text] (the peak-to-peak valu

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Xing, Jing Zhong, Li Chen, and Jin Chao Li. "Transverse Elastic Deformation Behavior of Aligned Fiber Bundles under Bulk Compressive Pressure and Longitudinal Stress." Advanced Materials Research 97-101 (March 2010): 1689–92. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.1689.

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Advanced composite materials generally use fiber in very high volume fraction, compression of textile/perform is adopted in manufacture processes. The major role of the compaction process is to obtain high fiber volume fraction in final parts. During the compaction process, transverse compaction of textile/perform is the main deformation form, where the compaction behavior of a fiber bundle is the most basis issue. In this paper, a micromechanical model of aligned fiber bundle with high fiber volume fraction was developed to investigate elastic deformation behavior under bulk compressive press

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Chen, Si Jia, and Ding Guo Zhang. "Modeling and Vibration Analysis of Hub-Flexible Beam System Carrying a Payload with Rotary Inertia." Advanced Materials Research 308-310 (August 2011): 1865–74. http://dx.doi.org/10.4028/www.scientific.net/amr.308-310.1865.

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The rigid-flexible coupling dynamics of a hub-flexible beam system carrying a payload with rotary inertia is presented. Both the transversal deformation and the longitudinal deformation of the flexible beam are considered. And in the total longitudinal deformation the non-linear coupling term, also known as the longitudinal shortening caused by transversal deformation, is considered. The approach of assumed modes is used to describe the deformation of the beam. The rigid-flexible coupling dynamic equations of the system are established via employing the second kind of Lagrange’s equation. Solv

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Nemirovskii, Yury, and Sergey Tikhonov. "The longitudinal-transverse bending of reinforced concrete rods." MATEC Web of Conferences 196 (2018): 01038. http://dx.doi.org/10.1051/matecconf/201819601038.

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The longitudinal transverse bending of multilayer rods made of reinforced concrete of arbitrary cross-section is considered. It is assumed that the coefficients in the connection equation between stresses, strains and temperature are different in each layer. The achievement of maximum deformation of the permissible limit value at stretching or compression is accepted as the criterion of conditional limit state in the i-layer. The case of longitudinal-transverse bending of a hinged rod is considered as an example of this method of solution. The distribution of bending moments and longitudinal f

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Zhang, Xinhai, Gang Wei, and Chengwu Jiang. "The Study for Longitudinal Deformation of Adjacent Shield Tunnel Due to Foundation Pit Excavation with Consideration of the Retaining Structure Deformation." Symmetry 12, no. 12 (2020): 2103. http://dx.doi.org/10.3390/sym12122103.

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By selecting the ratio of the cumulative maximum deformation of the retaining structure to the excavation depth as the control parameter of the retaining structure deformation, this paper established a sidewall unloading model which can consider the deformation of the retaining structure and the spatial effect of foundation pit excavation. Meanwhile, the impact region of the sidewall was divided to calculate the distribution of additional stress caused by foundation pit excavation. On this basis, through introducing the collaborative deformation model for rotation and dislocation of a shield t

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Zhao, Huiling, Yuheng Ma, and Xupeng Yao. "Dynamic Response of Curved Tunnels under Vertical Incidence of Transversal SV Waves." Shock and Vibration 2023 (April 25, 2023): 1–15. http://dx.doi.org/10.1155/2023/8561647.

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Long tunnels often have curved sections when alignment designs are influenced by topography, adverse geology, and environmental factors. When the transversal SV wave is incident vertically, the curved section of the tunnel is subject to a connection between longitudinal and transversal loads, which are asymmetrical about the tunnel longitudinal axis. Compared to straight tunnels, curved tunnels are more complex in terms of forces and deformations and may become a key control section limiting the seismic safety of curved tunnels. To investigate the seismic response of curved tunnels, numerical

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Чертова, Н. В., та Ю. В. Гриняев. "Характер деформаций на границе раздела упругих сред при условии скольжения". Письма в журнал технической физики 44, № 9 (2018): 88. http://dx.doi.org/10.21883/pjtf.2018.09.46070.17024.

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AbstractFresnel coefficients obtained when solving the problem of wave propagation through the interface of two elastic media and expressions for components of the elastic-distortion tensor allow one to study the character of dynamic deformations at the interface. Deformation modes different from zero at the interface of the elastic media under the slip-contact condition have been determined. Dependences of deformation amplitudes at the interface on the wave incidence angle and parameters of the adjacent media for incident longitudinal and transverse waves have been constructed and analyzed.

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Prommegger, Bernhard, Christof Kauba, Michael Linortner, and Andreas Uhl. "Longitudinal Finger Rotation—Deformation Detection and Correction." IEEE Transactions on Biometrics, Behavior, and Identity Science 1, no. 2 (2019): 123–38. http://dx.doi.org/10.1109/tbiom.2019.2902020.

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Lempereur, Mathieu, Nigussie Bogale, and Anthony Fung. "Trapped Rotablation Wire Causing Longitudinal Stent Deformation." Canadian Journal of Cardiology 30, no. 1 (2014): 146.e5–146.e7. http://dx.doi.org/10.1016/j.cjca.2013.10.008.

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Vijayvergiya, Rajesh, Prafull Sharma, Ankush Gupta, Praveg Goyal, and Prashant Panda. "Longitudinal stent deformation during coronary bifurcation stenting." Cardiovascular Revascularization Medicine 17, no. 2 (2016): 143–45. http://dx.doi.org/10.1016/j.carrev.2015.12.004.

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Chen, Huan, Mikhail N. Slipchenko, Yi Liu, et al. "Biaxial deformation of collagen and elastin fibers in coronary adventitia." Journal of Applied Physiology 115, no. 11 (2013): 1683–93. http://dx.doi.org/10.1152/japplphysiol.00601.2013.

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The microstructural deformation-mechanical loading relation of the blood vessel wall is essential for understanding the overall mechanical behavior of vascular tissue in health and disease. We employed simultaneous mechanical loading-imaging to quantify in situ deformation of individual collagen and elastin fibers on unstained fresh porcine coronary adventitia under a combination of vessel inflation and axial extension loading. Specifically, the specimens were imaged under biaxial loads to study microscopic deformation-loading behavior of fibers in conjunction with morphometric measurements at

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Di, Honggui, Shihao Huang, Longlong Fu, and Binglong Wang. "A variational method for calculating the longitudinal deformation of a shield tunnel in soft soil caused by grouting under tunnel." Engineering Computations 38, no. 6 (2021): 2733–54. http://dx.doi.org/10.1108/ec-09-2020-0490.

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Purpose The paper aims to predict longitudinal deformation of a tunnel caused by grouting under the tunnel bottom in advance according to the grouting parameters, which can ensure the safety of the tunnel structure during the grouting process and also help to design the grouting parameters. Design/methodology/approach The paper adopted the analytical approach for calculating the longitudinal deformation of a shield tunnel caused by grouting under a tunnel, including usage of the Mindlin’s solution, the minimum potential energy principle and case validation. Findings The paper provides a variat

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Ni, Mao, Qin, Xiao, and Fu. "Thermal Cycles and Deformation Characters During High-Speed Micro Friction Stir Welding Process of AA7075-T6 Sheets." Metals 9, no. 11 (2019): 1236. http://dx.doi.org/10.3390/met9111236.

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Thermal cycles and deformations during high-speed micro friction stir welding (μFSW) under different welding conditions were studied by experimental methods. The results show that the peak temperature and elevated-temperature exposure time (t150) increased with the increasing of rotational speed and decreased with the increasing of welding speed. Increasing rotational speed or welding speed led to an increase in both heating and cooling rates. The joint fabricated by the pinless tool experienced a lower peak temperature, a shorter elevated-temperature exposure time, and a larger temperature gr

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Akramova, E. G. "Clinical significance of left ventricular longitudinal deformation in coronary heart disease and non-coronary pathology." Kazan medical journal 100, no. 2 (2019): 295–302. http://dx.doi.org/10.17816/kmj2019-295.

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The values of the global longitudinal systolic deformation of the left ventricle have sufficiently high diagnostic informativeness, preceding the reduction of the left ventricular ejection fraction, local contractility and increase of troponins. Its indicators reflect the early deformation disorders not only in coronary heart disease, but can serve as a sensitive parameter of the formation of systolic dysfunction in diseases of any origin. The study of the global deformation of the left ventricle with the preservation of traditional echocardiographic parameters within the norm (ejection fracti

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Sosa, María, Linton Carvajal, Vicente Salinas Barrera, Fernando Lund, Claudio Aguilar, and Felipe Castro Cerda. "Acoustic Assessment of Microstructural Deformation Mechanisms on a Cold Rolled Cu30Zn Brass." Materials 17, no. 13 (2024): 3321. http://dx.doi.org/10.3390/ma17133321.

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The relationship between acoustic parameters and the microstructure of a Cu30Zn brass plate subjected to plastic deformation was evaluated. The plate, previously annealed at 550 °C for 30 min, was cold rolled to reductions ranging from 10% to 70%. Linear ultrasonic measurements were performed on each of the nine specimens, corresponding to the nine different reductions, using the pulse-echo method to record the times of flight of longitudinal waves along the thickness axis. Subsequently, acoustic measurements were conducted to determine the nonlinear parameter β through second harmonic generat

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Smetanin, M. Yu, D. V. Opolonskiy, A. V. Melnikov, L. T. Pimenov, and T. E. Chernyshova. "Features of left ventricular myocardial deformation in female patients of reproductive age with connective tissue dysplasia." Siberian Journal of Clinical and Experimental Medicine 37, no. 2 (2022): 92–97. http://dx.doi.org/10.29001/2073-8552-2022-37-2-92-97.

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Features of longitudinal left ventricular (LV) myocardial deformation in female patients of reproductive age with undifferentiated connective tissue dysplasia (UCTD) have not been specifically studied before.Aim. To study the features of longitudinal LV myocardial deformation using speckle tracking echocardiography in female patients of reproductive age with UCTD.Material and Methods. A noninvasive assessment of systolic LV myocardial deformation in the longitudinal direction using echocardiography was performed in 20 young adult female patients with UCTD (the average age was 23.5 ± 2.6 years)

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Liu, Ying Xiang, Pei Lian Feng, Wei Shan Chen, and Jun Kao Liu. "Study on the Wave Deformation of a Traveling Wave Piezoelectric Stator Using Composite Transducer." Advanced Materials Research 516-517 (May 2012): 1647–50. http://dx.doi.org/10.4028/www.scientific.net/amr.516-517.1647.

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In a previous study, the authors have presented and developed a cylindrical traveling wave piezoelectric motor using a composite transducer. This study focuses the research on the wave deformation problems in the proposed stator. Firstly, the standing wave excited by the longitudinal vibration of the transducer is analyzed, and the vibration amplitudes of particles on the driving teeth are extracted to present the objective wave shape. Then, the wave deformation of the standing wave excited by the bending vibration of the transducer is analyzed. Finally, the longitudinal and bending PZT are ex

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Antonova, L. N., and M. N. Alekhin. "Feasibility of the assessment of longitudinal systolic deformation of the left ventricle in transesophageal atrial pacing stress echocardiography. Clinical case." Medical alphabet 1, no. 15 (2023): 41–44. http://dx.doi.org/10.33667/2078-5631-2023-15-41-44.

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The article describes a clinical case of registration of longitudinal systolic deformation of the left ventricle using speckle-t racking technology during stress- echocardiography with transesophageal atrial pacing in a patient with coronary heart disease. A feature of the clinical case is the identification of changes in the longitudinal deformation of the left ventricular not only in the zone of visible local disturbances of myocardial contractility, but also in other zones, followed by the identification of hemodynamically significant stenoses of the coronary arteries, which supply the zone

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Xu, Bo Hao, Shuai Wang, Kai Fa Zhou, Wen Yi Ma, and Nan Sun. "Large Torsion Deformation: Centrosymmetric Reentrant Honeycomb." Applied Mechanics and Materials 904 (January 4, 2022): 17–25. http://dx.doi.org/10.4028/www.scientific.net/amm.904.17.

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There exist some problems in the crash box and anti-collision beam sandwich structure, such as monotone deformation pattern and uneconomical energy absorption performance. In order to raise the deformation capacity and energy absorption performance of sandwich structure, centrosymmetric reentrant honeycomb (CRH) and hexagonal centrosymmetric reentrant honeycomb (HCRH) are proposed based on auxetic reentrant honeycomb (ARH) in this work. Based on HCRH, four kinds of transverse combination structures and two kinds of longitudinal combination structures are obtained. The results of specific energ

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Chen, Ji Ping, Jian Qing Qian, and Sheng Zhi Li. "Analysis of Hot Leveling Deformation Rate on the Residual Stress of Steel Plate." Advanced Materials Research 179-180 (January 2011): 904–8. http://dx.doi.org/10.4028/www.scientific.net/amr.179-180.904.

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A 3D thermo-mechanical coupled model of hot leveling and cooling process of steel plate with nine rolls has been conducted with the aid of commercial non-linear FEM software. The effects of four hot leveling deformation rates on the transversal and longitudinal residual stresses of steel plate in the condition of same initial temperature distribution pattern has been analyzed. Different plastic deformation rates are obtained through the reduction change of No.2 leveler. The transversal and longitudinal residual stress distributions at different parts of steel plate are also studied. The result

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Shi, Chun Yuan, Qing Yuan Meng, and Cheng Jin. "Numerical Analysis of Controlling Welding Deformation of the Wall Plate of Large Cylindrical Structure by Pre-Stress Method." Advanced Materials Research 189-193 (February 2011): 3351–54. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.3351.

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During the welding of the wall plate of cylindrical structure, the edges of cylinder generates obvious wave-like deformation and affects subsequent assembly. In this paper, based on the numerical simulation method, welding deformation controlling by pre-stress method is studied. The effects of the pre-stress level and the welding sequence on the final deformation are discussed. The results show that the level of pre-stress can obviously control the welding deformation of the longitudinal beams, but can not control the welding deformation of transverse beams. Using the selected welding sequence

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Sun, Guoyao, and Huanjun Jiang. "Deformation Performance of Longitudinal Non-Uniformly Corroded Reinforced Concrete Columns." Materials 17, no. 21 (2024): 5303. http://dx.doi.org/10.3390/ma17215303.

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Due to the complexity of the marine corrosive environment, the rebar corrosion in reinforced concrete (RC) bridge piers is usually longitudinal non-uniform. However, the study on the mechanical behavior of longitudinal non-uniformly corroded RC structural members is very limited. To systematically study the deformation performance of the longitudinal non-uniformly corroded RC columns, the finite element models of 106 RC columns with different parameters were established using the commercial software ABAQUS 2016. The effects of the height of the bottom section (represented in the text by the va

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Lazouski, Dzmitry N., and Aliaksandr M. Khatkevich. "Deformation approach to the calculation of compression resistance of reinforced stone elements." Vestnik MGSU, no. 12 (December 2022): 1638–52. http://dx.doi.org/10.22227/1997-0935.2022.12.1638-1652.

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Introduction. When calculating stone and reinforced stone elements, only the limiting stage before destruction is considered, the nonlinearity of deformation of materials and, accordingly, the redistribution of forces between masonry and longitudinal reinforcement in cross sections are not taken into account. A deformation approach to the calculation of compression resistance of reinforced stone elements is considered. It allows us to take into account the physical nonlinearity of deformation of materials of reinforced stone elements.  Materials and methods. Accounting for physical

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Chai, Shaobo, Yifan Yan, Bo Hu, et al. "The Optimization of Secondary Lining Construction Time for Shield Tunnels Based on Longitudinal Mechanical Properties." Applied Sciences 13, no. 19 (2023): 10772. http://dx.doi.org/10.3390/app131910772.

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In the field of shield tunnels, the occurrence of uneven longitudinal settlement in segment linings has presented persistent challenges, including heightened risks of localized damage and water leakage. While the adoption of a secondary lining has been proposed as a viable solution to these issues, the question of how to select an appropriate construction time for the secondary lining, one that enables it to fully harness its load-bearing capacity while optimizing the tunnel’s overall stress and deformation characteristics, continues to be a pressing concern. To address this issue, this study

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Zhang, Xiaochuan, Jinwu Kang, Yiming Rong, Pengyue Wu, and Tao Feng. "Effect of Scanning Routes on the Stress and Deformation of Overhang Structures Fabricated by SLM." Materials 12, no. 1 (2018): 47. http://dx.doi.org/10.3390/ma12010047.

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Selective laser melting (SLM) is a promising manufacturing method for the construction of complicated precision parts. However, deformation of the overhang during the fabrication process and post treatment is still a common problem. In this paper, the effect of the scanning route on the residual stress and deformation of fabricated AlSi10Mg overhang specimens by SLM was investigated. Different scanning routes for the overhang including longitudinal direction, transverse direction, and the alternation between these two scanning routes in consecutive layers were studied by experiments within thi

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Nukhov, Danis, and Andrey O. Tolkushkin. "Theoretical Justification of the Longitudinal Rolling Method of the Thick Sheets by the Severe Shear Deformation." Solid State Phenomena 299 (January 2020): 617–21. http://dx.doi.org/10.4028/www.scientific.net/ssp.299.617.

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Severe plastic deformation (SPD) methods are based on obtaining materials with a grain size of about 100 nm by means of large strain. The SPD processes provide conditions for non-monotonic deformation of the billetsб due to the redistribution of metal macro-flows during shear or alternating strain. Numerous studies have proved the possibility of obtaining high total strain degree for a single SPD cycle. Traditional metal forming processes, such as rolling, implement monotonic deformation behaviorб due to one directional metal flow. In the process of longitudinal rolling, a banded coarse-graine

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Vasiliev, A. Yu, and E. B. Petrova. "Velocity Vector Imaging technology and standard echocardiography in evaluation of left ventricular function in patients with coronary artery disease before and after coronary bypass surgery." Regional blood circulation and microcirculation 18, no. 4 (2019): 29–36. http://dx.doi.org/10.24884/1682-6655-2019-18-4-29-36.

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Aim. To study strain and strain rate dynamics the left ventricle (LV) myocardium fibers in patients with ischemic heart disease after coronary artery bypass grafting (CABG) in the early and late periods.Material and methods. The dynamics of strain (S) and strain rate (SR) of longitudinal, circular and radial fibers in 148 patients (in 2646 LV segments) before and on the 12th day after CABG was studied using Velocity Vector Imaging technology. In the long-term (6, 12 and 24 months) 40 patients (720 LV segments) were examined.Results. A positive dynamics of SR longitudinal fibers (p = 0.0002) wa

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