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轿车白车身有限元模型修正研究 总被引:2,自引:0,他引:2
有限元模型与实际结构的一致性影响着CAE分析的可靠性。以典型点焊薄板件为例,分别采用刚性梁单元和等效板两种方式对结合面连接刚度进行了修正方法研究,并将研究方法成功应用于某轿车白车身的有限元模型上。修正后有限元模型的分析结果与试验结果基本一致。 相似文献
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A. I. Soshnikov K. S. Kravchuk I. I. Maslenikov D. V. Ovchinnikov V. N. Reshetov 《Instruments and Experimental Techniques》2013,56(2):233-239
Methods for measuring the resistivity of materials during elastic and elastoplastic interactions of a current-conducting indenter and a studied sample are described. Analytical methods that describe the dependences of the contact ohmic resistance on the pressure force and the contact stiffness are proposed. The considered models are experimentally tested with a NanoScan scanning nanohardness tester using indenters made of boron-doped diamond single crystals. 相似文献
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S. O. Abetkovskaia S. A. Chizhik V. A. Rudnitsky A. P. Kren 《Journal of Friction and Wear》2010,31(3):180-183
A new method to determine both the modulus of elasticity and the viscosity factor at the micro- and nanoscale based on a nonlinear
model of interaction of an indenter with a viscoelastic material is suggested using static-force spectroscopy of AFM. 相似文献
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落料拉深复合模的凸凹模是模具工作时的主要受力部件.凸凹模零件的强度、刚度以及疲劳寿命校核是模具设计时必须考虑的问题.在拉深件受力分析的基础上,建立了凸凹模的受力模型,通过对凸凹模零件进行有限元分析,计算了该零件的应力、位移分布和疲劳寿命.分析结果显示:凸凹模在工作时,可能出现问题的部位为拉深孔口处,出现的主要问题是凸凹模工作时孔口的磨损;而由于该零件在交变载荷作用下疲劳寿命较大,孔口出现局部剥落的可能性小. 相似文献
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Su-Hai Hsiang Huey-Lin Ho 《The International Journal of Advanced Manufacturing Technology》2005,26(1-2):47-55
During metal forging, warping can easily occur on the edge of the thin flange, causing it to fold, affecting the sustainability of the application of the flange. This investigation proposes a chamfer design for the die and the taper design for the ring gap, to eliminate warping. First, the radial forging process of work-hardened materials is simulated, the phenomenon of flange warping is analyzed, and the accuracy of the simulation is experimentally verified. Secondly, the materials, lubricants and the height of the ring gap of the die are set as fixed parameters, and the analytical results for dies with rounded corner, chamfered and a tapered of the ring gap, are compared. The experiments and simulation confirm that the problem of flange warping can be solved effectively. The results are as follows.When the die has a rounded corner and R=2 mm, serious warping and breaking creases are observed alongs the rim of the flange. When the die is designed with a chamfer, experiments and simulation both demonstrate that warping is reduced slowly as the chamfer value increases. When the die corner has a radius of R=2 mm, and has a taper shape between the rounded corner and the ring gap, experiments and simulation both indicate that warping declines as the tapering increases. However, as the contact area between the raw material and the die increases, its forming load increases with the taper angle. All of these results indicate that the solution to the warping problem proposed herein is feasible and effective, and that the results of this study represent useful references for design dies for radial forging. 相似文献
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WK-10型挖掘机斗杆有限元强度分析 总被引:2,自引:0,他引:2
王创民 《机械工程与自动化》2008,(6)
WK—10型挖掘机斗杆是挖掘机工作装置的主要构件之一,其所受载荷复杂,极易发生断裂失效。结合挖掘机的实际生产工况,对WK-10型挖掘机斗杆在各种不利工况下进行了三维有限元分析,得出了其应力分布,结果表明斗杆最大应力出现在斗杆的变截面处的内侧,此处即斗杆最容易开裂的部位,这一结论与斗杆在矿山使用时的实际情况相吻合。所得的结论对斗杆失效分析、寿命评估及结构优化设计具有一定的参考价值。 相似文献
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A novel method is developed to improve the accuracy in determining the mechanical properties from nanoindentation curves. The key point of this method is the simultaneous statistical treatment of several loading curves to correct the zero point error and identify the material properties considering size effects. The method is applied to four sandblasted aluminum-based specimens with different surface roughness. A linear relationship is obtained between the standard deviation of the initial contact error and the roughness which highlights the effect of the surface roughness on the reproducibility of the indentation curves. Moreover, the smaller standard deviation of the hardness given by the method confirms the importance of considering the initial contact error for an accurate determination of the material properties. 相似文献
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基于有限元分析方法,对由振子(超声换能器、变幅杆和工具)和主轴套筒构成的超声振动内圆磨头的主轴部件进行了结构分析研究,揭示了套筒结构和振子结构对主轴振动模态的影响,特别是对振子输出振动和套简振动的影响规律。基于上述分析提出了主轴的优化结构。 相似文献
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选择SiC基复合材料作为空间摆镜镜体材料,对摆镜的多种轻量化方案,包括不同的筋肋宽度、镜面厚度和斜切角度分别建立了有限元模型,并对其在自重情况下的刚度进行了分析计算,得到了位移场分布和变化;最终确定了满足光学和力学加工工艺前提下的质量最轻的最优化方案。 相似文献
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基于ANSYS的可转位刀片有限元分析 总被引:3,自引:0,他引:3
采用有限元软件ANSYS构建出具有复杂截面几何特性、复杂边界条件的硬质合金可转位刀片三维有限元模型。通过切削力试验测得切削力,在ANSYS中加载求解,进行应力场分析,计算出刀具的最大应力等,利用ANSYS的有限元分析和计算机图形学结合功能,显示三维应力等值线(面)、位移等值线(面)。结果表明该有限元模型更接近硬质合金可转位刀片的真实形状,可方便地进行硬质合金可转位刀具的抗弯强度和抗压强度校核,有利于对切削过程中的力学特性进行深入研究,为硬质合金可转位刀片的优化设计提供基础理论。 相似文献