Tìm thấy 18+ kết quả cho từ khóa "Numerical simulations"
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Results of the present investigation demonstrate that: (1) friction modeling at the tool-chip interface has a remarkable influence on the numerical simulations of machining. (2) reliability of the friction parameters is substantially interrelated with the choice and reliability of the constitutive model parameters. State-of-the-art review of meshfree cutting simulations. are among the state-of-the-art of SPH models. State-of-the-art review of friction in metal cutting.
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From numerical simulations it is difficult to determine a time for complete oxygen depletion in the cavity (see Figure 3).. Distribution of the current density in unsteady state conditions for iron oxidation.. Distribution of the current density in unsteady state conditions for oxygen reduction.. Experimental and simulated pH profiles obtained in the cavity 1 cm far from the mouth and at 200 µm from the steel surface..
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Four different amplitudes of excitation and three vari- ous boundary conditions in the axial direction has been considered and then numerical simulations with adjusted natural frequency (by Young modulus) and damping factor have been compared.. which describe a smooth change from softening to hardening by increas- ing the stiffness of the spring, are thoroughly confirmed. although in our study the beam has been excited kinematically, not para- metrically.
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Nonetheless, the numerical simulations are carried out assuming the FLS corresponding to a specified number of cycles such as 10 7 follows a normal (Gaussian) distribution.. As in the above simulations for the staircase tests, the mean = 50 and the standard deviation = 5. These simulations amount to nothing more than a numerical evaluation of how many samples have to be obtained to recover the properties of the normal distribution if each sample follows that distribution function statistically.
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The answer is one that annoys the mathematicians: The goal of numerical simulations is not always “accuracy” in a strictly mathematical sense, but sometimes “fidelity” to the underlying physics in a sense that is looser and more pragmatic. ∆x sin k∆x (19.1.28). (1 − cos k∆x So the stability criterion | ξ | 2 ≤ 1 is (again) simply the Courant condition (19.1.17).. Representation of the staggered leapfrog differencing scheme.
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The numerical model was presented to simulate the freezing of water droplets on a cold plate under the influence of the wetting angles o . We consider the temporal evolution of the freezing process and compare with the experiments of Pan et al. The results of the numerical simulations agree well with the experiments.
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To establish a basis for comparison of the dynamic response in the numerical simulations, the steel plates were spray-painted with a speckle pattern ( Fig. The stereovision setup of the two high-speed cameras (Phantom v2511) is illustrated in Fig. Weak coupling using CCFVs in the em- bedded FSI approach: (a) faces in the influence domain, (b) calculation of the pressure drop force 𝐟 Δ𝑝.
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In this implementation, the user will explore the formation of the universe, the generation of astrophysical jets, and the colliding galaxies by means of numerical simulations and VR technology. Numerical simulations will be performed on supercomputers at NCSA and their result- ing data sets will be stored at NCSA.
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For the staircase test simulations, total numbers of tests (N ) of 20, 50, and 100 were used. Their simulations for the staircase test method also showed that the influence of the step size on the mean is only significant if N is very small (<30). A similar observation can be made from the results of the numerical simulations summarized in Table 3.3 where the “true” normal distribution of FLS has a standard deviation of 5.
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This difference can be caused by the contact between the rollers of support and the surface of the concrete, which was not perfectly flat and smooth in the test as compared to that of the numerical model.. In this study, the static and dynamic behaviors of RC beams with and without the strengthening of FRP NSM method performed in experiment and numerical simulations..
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Moreover, the difference in SEA between the numerical and averaged experimental results of model is found to be 6.49%, whereas that of model is 6.96%, thereby validating the accuracy of the numerical simulations. In the following discussions the numerical results will be used to reveal more details.. At stage I with a compression displacement up to 1.3 mm, the structure is predominantly in the elastic range as can be clearly shown from the PEEQ contour.
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If the strain hardening portion of the material properties assumed was different from tile "true". response of the sections of Hasan and Hancock, and Zhao and Hancock, the numerical simulations are likely to produce inaccurate results.
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Using a very crude approximation to the shape of the K res profile from [67] and the K solution for the airfoil, Equations (8.12) and (8.13), some numerical simulations are presented to illustrate the growth/arrest behavior that can occur within a compressive residual stress field. In Figure 8.69 the shape of the applied, residual, and total stress. Figure 8.72.
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Estimates of the fracture resistance of pipelines are typically made using macro- scopic experiments. [30] used 2.5mm diam- eter hemispherical punch with 4 mm die radius to characterize the me- chanical properties of the heat-affected zone. 33] in conjunction with numerical simulations prescribes the alternative technique for characterizing the properties of the welding zone.
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As a major factor seems to be smoke and it contains toxic substances.. 1 shows the geometrical model of the hall, which will be carried out numerical simulations. The figure clearly shows the location of windows, doors, columns and generator of smoke and hazards – teacher desk.. The next step in the realization of the task is so cross-linking of the geometric model. The presence of the grid cell in the geometric volume is a prerequisite for carrying out the computational procedure..
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In order to evaluate the performance of the proposed metric, first, we describe numerical simulations with a spoke target shown in Fig. 1 and the cubic phase mask with mask parameter of a = 30. 20 is computed for numerical simulations of the five arbitrary.
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The DYNA suite of Lagrangian hydrocodes [13] was used in the numerical simulations. In the numerical simulation of an FOD event, each of the elements needs to translate the input energies and velocities into stresses and strains. There also needs to be a physically based means of determining when the material represented in each element fails. accuracy of the overall prediction is dependent upon the accuracy of the constitutive and failure models..
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By this approach, the valid- ity of the failure strain is confined to proportional loading paths. curves from the simulations to those of the experiments. The versatility and effectiveness of the localization analyses were demonstrated by Morin et al. Numerical simulations of the tests were performed, and the failure strains were estimated by com- parison to the experimental data. Localization analyses by use of the imperfection band approach were conducted to predict the onset of lo- calization.
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Numerical Simulations of Transport With the advent of high-speed digital com- puters, it has become possible to carry out numerical simulations with great accuracy for virtually any geometrical configuration in laminar flow. The focus in these solu- tions is on the determination of generalized transport correlations and on the detailed descriptions of the thermal and flow fields. 6.4 HEAT TRANSFER FROM SINGLE OBJECTS IN UNIFORM FLOW 6.4.1 High Reynolds Number Flow over a Wedge.
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Numerical simulations, performed for an elasto-plastic material with micro-cavities, illustrate the scope and benefits of the described computational strategy..