|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Designing of ECAP parameters based on strain distribution uniformity | F.Djavanroodi B.Omranpour M.Ebrahimi M.Sedighi | 2012 | Progress in Natural Science:Materials International2012，22，5： | 8 |
| 2 | Severe plastic deformation (SPD) of biodegradable magnesium alloys and composites: A review of developments and prospects显示文摘The use of magnesium in orthopedic and cardiovascular applications has been widely attracted by diminishing the risk of abnormal interaction of the implant with the body tissue and eliminating the second surgery to remove it from the body.Nevertheless,the fast degradation rate and generally inhomogeneous corrosion subsequently caused a decline in the mechanical strength of Mg during the healing period.Numerous researches have been conducted on the influences of various severe plastic deformation(SPD)processes on magnesium bioalloys and biocomposites.This paper strives to summarize the various SPD techniques used to achieve magnesium with an ultrafine-grained(UFG)structure.Moreover,the effects of various severe plastic deformation methods on magnesium microstructure,mechanical properties,and corrosion behavior have been discussed.Overall,this review intends to clarify the different potentials of applying SPD processes to the magnesium alloys and composites to augment their usage in biomedical applications. | M.Kasaeian-Naeini M.Sedighi R.Hashemi | 2022 | Journal of Magnesium and Alloys2022，10，4： | 6 |
| 3 | 纳米Al2O3增强颗粒对热锻AZ31B镁合金单轴及高周疲劳性能的影响显示文摘研究热锻工艺对AZ31B合金和AZ31B/1.5vol.%Al2O3纳米复合材料在静态和循环加载下的显微组织和力学性能的影响。首先将铸态合金和复合材料在450℃下进行均匀化热处理,然后在450℃下进行开式模锻。结果表明,增强颗粒的存在有利于晶粒细化和改善动态再结晶。锻造工艺能更有效地消除铸态合金工件中的孔隙。与铸态和锻态合金试样相比,锻态复合材料的显微硬度分别提高80%和16%。与锻态合金的相似区域相比,锻态复合材料的极限抗拉强度和最大拉伸应变分别提高45%和23%,极限压缩强度和最大压缩强度分别提高50%和37%。复合材料在低应变区的疲劳寿命提高,而在高应变区的疲劳寿命降低。与AZ31B试样不同,复合材料的拉伸、压缩和高周疲劳行为对施加应变的敏感性较低,这与试样在热锻前后的孔隙率有关。 | M.DAREINI A.H.JABBARI M.SEDIGHI | 2020 | Transactions of Nonferrous Metals Society of China2020，30，5： | 3 |
| 4 | DYNAMIC PULL-IN INSTABILITY OF DOUBLE-SIDED ACTUATED NANO-TORSIONAL SWITCHES显示文摘A nonlinear frequency-amplitude relation is developed to investigate the vibrational amplitude effect on the dynamic pull-in instability of double-sided-actuated nano-torsional switches. The governing equation of a nano-electro-mechanical system pre-deformed by an electric field contains the quintic nonlinear term. The influences of basic parameters on the pull-in instability and natural frequency are investigated using a powerful analytical approach called the homotopy perturbation method. It is demonstrated that two terms in series expansion are sufficient to produce an acceptable solution. The numerical results obtained have verified the soundness of the asymptotic procedure. The phase portraits of the double-sided nano-torsionalactuator exhibit periodic, homoclinic and heteroclinic orbits. | Hamid M.Sedighi Kourosh H.Shirazi | 2015 | Acta Mechanica Solida Sinica2015，28，1： | 1 |
| 5 | Effect of stiffeners on crashworthiness of square aluminium columns considering damage evolution显示文摘Combining the optimization and FEM technology,crashworthiness of aluminum extrusions was studied for an automobile safety plan.The effects of longitudinal stiffeners on the crushing of stiffened square columns were studied considering the damage evolution.The numerical analysis was carried out by ABAQUS software.Subsequently,the collapse behavior of aluminum extrusion damage was validated by comparing against solution published in literature.Finally,in order to find more efficient and lighter crush absorber and achieving minimum peak crushing force,response surface methodology(RSM) has been applied for optimizing the aluminum extrusion tube. | H.R.Allahbakhsh M.Shariati M.Sedighi | 2013 | Journal of Central South University2013，20，3： | 1 |
| 6 | Divergence and flutter instability of magneto-thermo-elastic C-BN hetero-nanotubes conveying fluid显示文摘On the basis of finite element analysis,an eigenvalue problem is performed to examine the vibrational characteristics of a hetero-nanotube made of carbon(C)and boron nitride(BN)nanotubes in magnetic and thermal environment.By incorporating the assumption of nonlocal elasticity theory,the size-dependent behavior of the considered structure is also taken into account.The obtained results demonstrate that the onset of the divergence and flutter instabilities may be postponed by exploiting a hetero-nanotube rather than a uniform one composed of carbon nanotube.Moreover,it is exhibited that,in the presence of fluid flow,the mode shape configuration of nanotubes may be different from those of classical modes and therefore the later one should not be utilized in the dynamic analysis of fluid-conveying tubes.Finally,it is shown that,as the temperature decreases,the natural frequencies of the system decrease in high temperature conditions and increase for the case of room temperature. | Hamid M.Sedighi | 2020 | Acta Mechanica Sinica2020，36，2： | 0 |
| 7 | Strain-Rate Dependency of a Unidirectional Filament Wound Composite under Compression显示文摘This article presents the results of experimental studies concerning the dynamic deformation and failure of a unidirectional carbon fiber reinforced plastic(T700/LY113)under compression.The test samples were manufactured through the filament winding of flat plates.To establish the strain rate dependencies of the strength and elastic modulus of the material,dynamic tests were carried out using a drop tower,the Split Hopkinson Pressure Bar method,and standard static tests.The samples were loaded both along and perpendicular to the direction of the reinforcing fiber.The applicability of the obtained samples for static and dynamic tests was confirmed through finite elementmodeling and the high-speed imaging of the deformation and failure of samples during testing.As a result of the conducted experimental studies,static and dynamic stress-strain curves,time dependencies of deformation and the stress and strain rates of the samples during compression were obtained.Based on these results,the strain rate dependencies of the strength and elasticity modulus in the strain rate range of 0.001-6001/s are constructed.It is shown that the strain rate significantly affects the strength and deformation characteristics of the unidirectional carbon fiber composites under compression.An increase in the strain rate by 5 orders of magnitude increased the strength and elastic modulus along the fiber direction by 42%and 50%,respectively.Perpendicular loading resulted in a strength and elastic modulus increase by 58%and 50%,respectively.The average strength along the fibers at the largest studied strain rate was about 1000MPa.The obtained results can be used to design structural elements made of polymer composite materials operating under dynamic shock loads,as well as to build models of mechanical behavior and failure criteria of such materials,taking into account the strain rate effects. | Stepan Konev Victor A.Eremeyev Hamid M.Sedighi Leonid Igumnov Anatoly Bragov Aleksandr Konstantinov Ayaulym Kuanyshova Ivan Sergeichev | 2023 | Computer Modeling in Engineering & Sciences2023，137，12： | 0 |
| 8 | 应变路径对AA1050铝板力学性能、成形极限曲线及织构演化影响的实验研究显示文摘实验研究了应变路径变化对AA1050铝合金力学性能、成形性能和成形极限的影响。讨论了以单向、反向和交叉轧制的三种不同方式的应变路径。对比了三种轧制方式在20%和40%轧制比下的晶粒尺寸、硬度、应力-应变曲线和成形极限。结果表明,交叉轧制试样的晶粒尺寸小于其他方式轧制试样的晶粒尺寸;单向和交叉轧制试样的强度和伸长率均高于反向轧制方式的,单向和交叉轧制试样的硬度等于或大于反向轧制试样的;此外,交叉轧制使试样的各向异性减小,R趋近于1。试样的成形极限在交叉轧制方式下明显提高,在40%轧制比下,交叉轧制的FLC_(0)为0.113,单向轧制的FLC_(0)为0.09,反向轧制的FLC_(0)为0.081。单向和反向轧制的成形极限与加载路径的相关。 | A.ROUZBEH S.M.ATIFEH M.SEDIGHI R.HASHEMI | 2023 | Journal of Central South University2023，30，8： | 0 |
| 9 | 工艺参数对摩擦辅助管应变法加工管组织和力学性能的影响显示文摘研究了摩擦辅助管应变(FATS)法对管材组织和力学性能的影响。采用有限元法分析并进行实验测试。用Taguchi设计(ATD)进行分析,改变转速、进给速率和模具角度来进行数值和实验试验。结果表明,提高进给速率和降低转速提高了Zener-Hollomon参数(Z),减小了平均晶粒尺寸,而对模具角度没有显著影响。增加Z值可以减小晶粒尺寸,增强加工样品的流动应力。实验结果表明,具有最大Z值的样品其晶粒尺寸从初始的40μm细化到8μm,其流动应力增加5倍。 | S.H.HOSSEINI M.SEDIGHI | 2021 | Journal of Central South University2021，28，10： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员