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您的检索式：作者名="A.HOSSEINI"
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| 1 | PTCAP工艺生产的Al 5083薄壁管吸能能力的实验验证和数值计算显示文摘对平行管角挤压(PTCAP)工艺生产的Al5083薄壁管的吸能能力进行评价。研究沿周向和轴向方向的显微结构、力学性能和各向异性系数。结果表明:能量吸收值随加工道次的增加而降低,未处理、第一道次和第二道次处理的样品的能量吸收值分别为167、161.4和160.7J。能量吸收值的数值模拟结果与未处理的、第一和第二道次PTCAP处理后样品之间的误差分别约为5%、10%和13%。吸能能力与各向异性系数和显微结构有关。结果表明,经过一道次和二道次PTCAP处理后,晶粒得到细化,极限抗拉强度和显微硬度均得到提高,但一道次处理后的提高幅度更大。此外,通过PTCAP处理,变形模式发生改变,退火后样品的变形模式非常对称且呈圆形,而第一和第二道次变形样品的变形模式为三叶和双叶钻石形状。退火管和PTCAP处理管变形模式的数值模拟结果与实验结果一致。总之,薄壁管的变形模式取决于其力学性能和PTCAP过程中力学性能的变化。 | A.HOSSEINI D.RAHMATABADI R.HASHEMI H.AKBARI | 2020 | Transactions of Nonferrous Metals Society of China2020，30，5： | 3 |
| 2 | Comparative numerical study of single and two-phase models of nanofluid heat transfer in wavy channel显示文摘The main purpose of this study is to survey numerically comparison of twophase and single phase of heat transfer and flow field of copper-water nanofluid in a wavy channel. The computational fluid dynamics(CFD) prediction is used for heat transfer and flow prediction of the single phase and three different two-phase models(mixture,volume of fluid(VOF), and Eulerian). The heat transfer coefficient, temperature, and velocity distributions are investigated. The results show that the differences between the temperature field in the single phase and two-phase models are greater than those in the hydrodynamic field. Also, it is found that the heat transfer coefficient predicted by the single phase model is enhanced by increasing the volume fraction of nanoparticles for all Reynolds numbers; while for the two-phase models, when the Reynolds number is low,increasing the volume fraction of nanoparticles will enhance the heat transfer coefficient in the front and the middle of the wavy channel, but gradually decrease along the wavy channel. | M.M.RASHIDI A.HOSSEINI I.POP S.KUMAR N.FREIDOONIMEHR | 2014 | Applied Mathematics and Mechanics(English Edition)2014，35，7： | 2 |
| 3 | 查看详情显示文摘 | M.A.Khalilzadeh A.Hosseini A.Pilevar | | 0，，： | 1 |
| 4 | Reproducing fling-step and forward directivity at near source site using of multi-objective particle swarm optimization and multi taper显示文摘This paper presents a technique to reproduce compatible seismograms involving permanent displacement effects at sites close to the fault source.A multi-objective evolutionary algorithm is used to minimize the differences between the response spectra and multi-tapered power spectral densities corresponding to the recorded and simulated waveforms.The multi-taper method is used to reduce the spectral leakage that is inherent in the Fourier transformed form of waveforms,leading to a reduction of variance in power spectral amplitudes,thus permitting the calibration of the two sets of data.The technique is implemented using the 1998-Fandoqa(Iran)earthquake data and the results are compared with the actual observed data.Additionally,a comparison is made with a SAR interferometry study leading to fair agreement with the reported dislocation along the main fault.The simulation procedure and results are discussed and assessed concluding that,although the technique may be associated with uncertainties,it can still be used to reproduce waveforms at near source sites that include permanent dislocation,and can be used for seismic performance evaluation of structures in the region under study. | A.Nicknam A.Hosseini H.Hamidi Jamnani M.A.Barkhordari | 2013 | Earthquake Engineering and Engineering Vibration2013，12，4： | 1 |
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