Dynamics of the beam laying on the elastic basis of the Pasternak model carrying the moving constant load

Abstract A fatigue testing system is established with which the real-time recording of stress, strain, temperature, and hysteresis loss of rubbers or cord-rubber composite specimens subjected to periodic loading or extension can be successfully carried out. Several problems are connected with the experimental study of the fatigue of rubber composites. In constant extension cycling, the specimen becomes relaxed because of the viscoelasticity of rubber composites, and the imposed tension-tension deformation becomes complex. In this method, the specimen is unlikely to fail unless the imposed extensions are very large. Constant load cycling can avoid the shortcomings of constant extension cycling. The specially designed clamps ensure that the specimen does not slip when the load retains a constant value. The Deformation and fatigue damage accumulation processes of rubber composites under periodic loading are also examined. Obviously, the effect of cycle frequency on the fatigue life of rubber composites can not be ignored because of the viscoelasticity of constituent materials. The increase of specimen surface temperature is relatively small in the case of 1 Hz, but the temperature can easily reach 100°C at the 8 Hz frequency. A method for evaluating the fatigue behavior of tires is proposed.

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Exercise slightly above the maximal lactate steady state reduces self-efficacy and increases negative affect

10.31236/osf.io/ecgkp ◽

2019 ◽

Author(s):

James Graeme Wrightson ◽

Louis Passfield

Keyword(s):

Steady State ◽

Negative Affect ◽

Power Output ◽

Self Efficacy ◽

Repeated Measures ◽

Physiological State ◽

Constant Load ◽

Peak Power Output ◽

Time To Exhaustion ◽

Maximal Lactate Steady State

Objectives: To examine the effect of exercise at and slightly above the maximal lactate steady state (MLSS) on self-efficacy, affect and effort, and their associations with exercise tolerance.Design: Counterbalanced, repeated measures designMethod: Participants performed two 30‐minute constant‐load cycling exercise at a power output equal to that at MLSS and 10 W above MLSS, immediately followed by a time‐to‐exhaustion test at 80% of their peak power output. Self-efficacy, affect and effort were measured before and after 30 minutes of cycling at and above MLSS.Results: Negative affect and effort higher, and self-efficacy and time to exhaustion were reduced, following cycling at MLSS + 10 W compared to cycling at the MLSS. Following exercise at the MLSS self-efficacy, affect and effort were all associated with subsequent time-to exhaustion. However, following exercise at MLSS + 10 W, only affect was associated with time-to exhaustion. Conclusions: Self efficacy, affect and effort are profoundly affected by physiological state, highlighting the influence of somatic states on perceptions and emotions during exercise. The affective response to exercise appears to be associated with exercise tolerance, indicating that the emotional, as well as physiological, responses should be considered when prescribing exercise training.

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Study of a generalized Langevin equation with nonlocal dissipative force, harmonic potential and a constant load force

The European Physical Journal B ◽

10.1140/epjb/e2008-00344-1 ◽

2008 ◽

Vol 65 (2) ◽

pp. 265-270 ◽

Cited By ~ 5

Author(s):

K. S. Fa

Keyword(s):

Langevin Equation ◽

Constant Load ◽

Dissipative Force ◽

Harmonic Potential ◽

Load Force ◽

Generalized Langevin Equation

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Finite-difference equations of quasistatic motion of the shallow concrete shells in nonlinear setting

Curved and Layered Structures ◽

10.1515/cls-2020-0005 ◽

2020 ◽

Vol 7 (1) ◽

pp. 48-55 ◽

Cited By ~ 1

Author(s):

Bolat Duissenbekov ◽

Abduhalyk Tokmuratov ◽

Nurlan Zhangabay ◽

Zhenis Orazbayev ◽

Baisbay Yerimbetov ◽

...

Keyword(s):

Finite Difference ◽

Differential Equations ◽

Difference Equations ◽

Constant Load ◽

Time Interval ◽

Test Case ◽

Algebraic Equations ◽

Nonlinear Properties ◽

Finite Difference Equations ◽

Concrete Shells

AbstractThe study solves a system of finite difference equations for flexible shallow concrete shells while taking into account the nonlinear deformations. All stiffness properties of the shell are taken as variables, i.e., stiffness surface and through-thickness stiffness. Differential equations under consideration were evaluated in the form of algebraic equations with the finite element method. For a reinforced shell, a system of 98 equations on a 8×8 grid was established, which was next solved with the approximation method from the nonlinear plasticity theory. A test case involved computing a 1×1 shallow shell taking into account the nonlinear properties of concrete. With nonlinear equations for the concrete creep taken as constitutive, equations for the quasi-static shell motion under constant load were derived. The resultant equations were written in a differential form and the problem of solving these differential equations was then reduced to the solving of the Cauchy problem. The numerical solution to this problem allows describing the stress-strain state of the shell at each point of the shell grid within a specified time interval.

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Effects of conform, non-conform, and hybrid conformity toward stress distribution at the glenoid implant and cement: A finite element study

The International Journal of Artificial Organs ◽

10.1177/0391398821999391 ◽

2021 ◽

pp. 039139882199939

Author(s):

Abdul Hadi Abdul Wahab ◽

Nor Aqilah Mohamad Azmi ◽

Mohammed Rafiq Abdul Kadir ◽

Amir Putra Md Saad

Keyword(s):

Stress Distribution ◽

Daily Living ◽

3D Model ◽

Promising Result ◽

High Stress ◽

Constant Load ◽

Posterior Region ◽

Implant Stability ◽

Eccentric Load ◽

Standing Up

Glenoid conformity is one of the important aspects that could contribute to implant stability. However, the optimal conformity is still being debated among the researchers. Therefore, this study aims to analyze the stress distribution of the implant and cement in three types of conformity (conform, non-conform, and hybrid) in three load conditions (central, anterior, and posterior). Glenoid implant and cement were reconstructed using Solidwork software and a 3D model of scapula bone was done using MIMICS software. Constant load, 750 N, was applied at the central, anterior, and posterior region of the glenoid implant which represents average load for daily living activities for elder people, including, walking with a stick and standing up from a chair. The results showed that, during center load, an implant with dual conformity (hybrid) showed the best (Max Stress—3.93 MPa) and well-distributed stress as compared to other conformity (Non-conform—7.21 MPa, Conform—9.38 MPa). While, during eccentric load (anterior and posterior), high stress was located at the anterior and posterior region with respect to the load applied. Cement stress for non-conform and hybrid implant recorded less than 5 MPa, which indicates it had a very low risk to have cement microcracks, whilst, conform implant was exposed to microcrack of the cement. In conclusion, hybrid conformity showed a promising result that could compromise between conform and non-conform implant. However, further enhancement is required for hybrid implants when dealing with eccentric load (anterior and posterior).

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The Effect of RME-1-Butanol Blends on Combustion, Performance and Emission of a Direct Injection Diesel Engine

Energies ◽

10.3390/en14102941 ◽

2021 ◽

Vol 14 (10) ◽

pp. 2941

Author(s):

Wojciech Tutak ◽

Arkadiusz Jamrozik ◽

Karol Grab-Rogaliński

Keyword(s):

Diesel Engine ◽

Heat Release ◽

Direct Injection ◽

Specific Energy Consumption ◽

Combustion Process ◽

Constant Load ◽

Combustion Stability ◽

Performance And Emission ◽

Energy Share ◽

The Stability

The main objective of this study was assessment of the performance, emissions and combustion characteristics of a diesel engine using RME–1-butanol blends. In assessing the combustion process, great importance was placed on evaluating the stability of this process. Not only were the typical COVIMEP indicators assessed, but also the non-burnability of the characteristic combustion stages: ignition delay, time of 50% heat release and the end of combustion. The evaluation of the combustion process based on the analysis of heat release. The tests carried out on a 1-cylinder diesel engine operating at a constant load. Research and evaluation of the combustion process of a mixture of RME and 1-butanol carried out for the entire range of shares of both fuels up to 90% of 1-butanol energetic fraction. The participation of butanol in combustion process with RME increased the in-cylinder peak pressure and the heat release rate. With the increase in the share of butanol there was noted a decrease in specific energy consumption and an increase in engine efficiency. The share of butanol improved the combustion stability. There was also an increase in NOx emissions and decrease in CO and soot emissions. The engine can be power by blend up to 80% energy share of butanol.

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Limitation of Erlang B Traffic Model in Elastic Optical Network for Blocking Probability Estimation

Journal of Optical Communications ◽

10.1515/joc-2018-0055 ◽

2018 ◽

Vol 0 (0) ◽

Author(s):

Ujjwal ◽

Jaisingh Thangaraj

Keyword(s):

Blocking Probability ◽

Optical Network ◽

Constant Load ◽

Traffic Model ◽

Service Rate ◽

Service Provisioning ◽

Connection Request ◽

Elastic Optical Network ◽

Simulation Results ◽

Single Path

Abstract In this paper, an algorithm for multipath connection provisioning in elastic optical network (EON) has been proposed. Initially, the algorithm prefers the single-path routing for service provisioning. But when single-path routing is not adequate to serve a dynamic connection, the algorithm switches to the connection request fragmentation. Its computation is based on the parameters such as capacity_constant and capacity_allowed to fragment the connection request on disjoint paths. Simulation results clearly state that the proposed algorithm performs well in service provisioning as compared to the traditional single-path routing algorithms and improves the average network throughput. Thereafter, we have investigated the limitation of Erlang B traffic model in EON for calculation of link blocking probability using routing and spectrum assignment (RSA) algorithm. It is verified by the following two ways: (i) effect on the blocking probability in case of constant load and (ii) effect of slot width on the blocking probability. Our simulation results indicate that in EON due to dynamic RSA, blocking probability is not constant in case of proportionate varying of call arrival and service rate giving constant load and blocking probability depends on the number of slots per link, but in Erlang B traffic model blocking probability is always constant in case of constant load and it considers wavelength per link instead of slots per link. This is attributed to the fact that Erlang B traffic model fails to calculate blocking probability accurately in EON. We have computed the carried traffic on 14 nodes, 21-link National Science Foundation Network (NSFNET) topology.

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Differences in muscular activation and fatigue for intermittent and constant load

Occupational Ergonomics ◽

10.3233/oer-2005-5105 ◽

2005 ◽

Vol 5 (1) ◽

pp. 43-56

Author(s):

Danuta Roman-Liu ◽

Krzysztof Kȩdzior

Keyword(s):

External Force ◽

Upper Limb ◽

Muscle Activation ◽

Regression Line ◽

Constant Load ◽

Median Frequency ◽

Experimental Conditions ◽

Emg Signal ◽

Limb Posture ◽

Muscular Activation

The aim of this study was to compare the influence of constant or intermittent load on muscle activation and fatigue. The analysis and assessment of muscular activation and fatigue was based on surface EMG measurements from eight muscles (seven muscles of the right upper limb and trapezius muscle). Two EMG signal parameters were analyzed for each of the experimental conditions distinguished by the value of the external force and the character of the load – constant or intermittent. The amplitude related to its maximum (AMP) and the slope of the regression line between time and median frequency (SMF) were the EMG parameters that were analyzed. The results showed that constant load caused higher muscular fatigue than intermittent load despite the lower value of the external force and lower muscle activation. Results suggest that additional external force might influence muscle activation and fatigue more than upper limb posture. The results of the study support the thesis that all biomechanical factors which influence upper limb load and fatigue (upper limb posture, external force and time sequences) should be considered when work stands and work processes are designed. They also indicate that constant load should be especially avoided.

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A Simplified Analysis Method for the Deformation Response of an Existing Tunnel to Ground Surcharge Based on the Pasternak Model

Applied Sciences ◽

10.3390/app11073255 ◽

2021 ◽

Vol 11 (7) ◽

pp. 3255

Author(s):

Zheng Wei ◽

Yusheng Jiang

Keyword(s):

Longitudinal Displacement ◽

Maximum Displacement ◽

Deformation Response ◽

Reaction Coefficient ◽

Element Simulation ◽

Tunnel Model ◽

Calculation Results ◽

Pasternak Model ◽

Boussinesq Solution ◽

Euler Bernoulli Beam

Surface surcharge changes the existing equilibrium stress field of the stratum and adversely affects the existing tunnel. This paper presents a simplified analytical solution for calculating the longitudinal displacement of existing tunnels that are subjected to adjacent surcharge loading. Based on the Boussinesq solution, the distribution of the additional load matrix caused by the surface surcharge on the existing tunnel was obtained. A Euler–Bernoulli beam with a Pasternak foundation was used as a simplified model for tunnel stress analysis. Using the corrected reaction coefficient of the foundation bed, the differential equation of tunnel deformation was established, and the solution matrix of the longitudinal displacement of the tunnel was obtained by using the finite difference method. The reliability and applicability of the proposed method were verified by comparing the results with finite element simulation results, field test data, and the calculation results of three simplified elastic analysis methods with different foundation bed coefficients. On this basis, the parameters of the load–tunnel model were analyzed, and the effects of the buried depth, the size of the load, the relative positions of the load and the tunnel, and the relative stiffness of the tunnel soil on the maximum displacement of the existing tunnel were calculated. An empirical formula is proposed for calculating the maximum longitudinal displacement of the existing tunnel subjected to surface surcharge. The findings of this research can provide a basis for the theoretical verification of the deformation response of an existing tunnel subjected to adjacent surface surcharge.

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