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bar bar     
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  杆杆
     The tensile mechanical behaviors of 1 6Si 1 58Mn 0 19C TRIP steels under high strain rate were studied with a self designed pneumatically actuating tensile impact bar bar tester,and compared to the quasi static tensile behavior.
     在自制气动式间接杆杆型冲击拉伸试验机上对含 1 6Si 1 5 8Mn 0 1 95C的TRIP (Transformation inducedPlasticity)钢在不同应变率下的高速冲击拉伸性能进行了研究 ,并和静态拉伸性能进行了比较。
短句来源
     The experiments on Kevlar49 fibre bundles under quasi static tension and tensile impact were performed in MTS810 and Bar Bar Tensile Impact Apparatus, respectively. The stress strain curves of Kevlar49 fibre bundles were obtained at strain rates ranging from 10 -4 /s to 10 3/s.
     利用MTS810材料试验机及旋转盘式杆杆型冲击拉伸试验装置对Kevlar49纤维束进行了准静态拉伸及冲击拉伸实验研究,首次在应变率为10-4/s~103/s范围内得到了Kevlar49纤维束完整的应力应变曲线。
短句来源
     In this paper,using our design of bar bar tensile impact apparatus,we performed an experimental study of ARALL and ARALL(prestress)in the strain rate range from 200s -1 to 1300s -1 .The complete stress strain curves of composite under tensile impact was obtained.
     利用自行研制的旋转盘式间接杆杆型冲击拉伸试验装置对ARALL材料以及施加预应力的ARALL材料进行了3个应变率(200、500、1300s-1)的冲击拉伸试验,得到了两种材料在不同应变率下的完整的应力应变曲线。
短句来源
     Two Dimensional Axisymmetric Analysis of Bar Bar Tensile Impact Testing Apparatus by Elastoplastic FEM
     杆杆型冲击拉伸试验装置的二维轴对称弹塑性有限元分析
短句来源
     Tensile impact test of a unidirectional Kevlar 49/phenolic composite(KFRP)were carried out in a Bar Bar Tensile Impact Apparatus. Three high strain rates 150s 1 ,400s -1 and 1500s -1 were used in the experiments; complete stress strain relations have been obtained respectively.
     在旋转盘式杆杆型冲击拉伸试验装置上 ,对单向Kevlar 49纤维增强酚醛树脂复合材料(KFRP)进行了冲击拉伸试验 ,得到了应变率为 15 0 ,40 0和 15 0 0s-1下的单向KFRP的完整拉伸应力应变曲线 ;
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  “bar bar”译为未确定词的双语例句
     APPLICATION OF FOURIER ANALYSIS OF THE DISPERSION EFFECT TO SPLIT HOPKINSON PRESSURE TESTING SYSTEM AND BAR BAR TENSILE IMPACT TESTING SYSTEM
     傅立叶弥散分析在冲击拉伸和冲击压缩试验中的应用
短句来源
     Effect of Lycium Bar bar um Polysaccharide on T-lymphocyte Subsets and Dendritic Cells in H_(22)- bearing Mice
     枸杞多糖对荷瘤小鼠淋巴细胞亚群及树突状细胞表达的影响
短句来源
     2.The contact option between bullet and bar ,bar and specimen. Contact stiffness is an important factor in the simulation fidelity.
     2、讨论了子弹、压杆和试样之间接触设置问题,指出接触刚度是影响模拟真实性的一个重要因素,尤其在试样与压杆的接触设置中,接触刚度对接触面应力应变的计算结果比较敏感。
短句来源
     In this paper,the Fourier method and corresponding code (FFTDSP) for dispersion analysis in the bar is applied to the Split Hopkinson Pressure Testing System and the Bar Bar Tensile Impact Testing System.
     将傅立叶弥散分析方法和程序(FFTDSP)应用于冲击拉伸和冲击压缩试验中,分析了输入杆和输出杆中波的弥散效应对试验结果的影响。
短句来源
     Tensile impact tests of aramid (Twaron) fiber bundles are carried out under high strain rates with a wider range of 0 001~1000 s -1 by means of MTS and bar bar tensile impact apparatus.
     用MTS和旋转盘式杆—杆型冲击拉伸试验装置 ,获得 0 0 1~ 10 0 0s- 1 应变率范围内芳纶纤维束的应力应变曲线。
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     M-PARK BAR
     徜徉音乐公园
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     Book Bar
     书吧
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Cracks may occur in the centre of the remainder of a billet during bar- bar combined extrusion if the original height or the remaining height of the billet is short.In this paper,the upper bound method is used to determine the conditions for the formation of central cracking by establishing a kinem- atically admissible velocity field with crack defects and utilizing the minim- um energy principle.The experimental results showed that the increase of de- formation will cause the critical relative thickness...

Cracks may occur in the centre of the remainder of a billet during bar- bar combined extrusion if the original height or the remaining height of the billet is short.In this paper,the upper bound method is used to determine the conditions for the formation of central cracking by establishing a kinem- atically admissible velocity field with crack defects and utilizing the minim- um energy principle.The experimental results showed that the increase of de- formation will cause the critical relative thickness of a billet to dcrease,and that the theoretical analysis is in good agreement with the experimental resu- lts.

在杆杆型复合挤压时,如果坯料原始高度不大或剩余高度较小,则可能在剩余坯料的中部出现开裂。本文利用上限法,通过建立带中部开裂缺陷的运动学容许速度场,并利用最小能量原理,确定了中部开裂的产生条件。变形程度增加,可以使得这种缺陷产生的临界相对余厚减小。实验表明,理论结果与实验结果相当一致。

The papers using upper-bound approach to analyze the forming processesare fairly numerous [1-5, 7-12], however, bar-bar combined extrusion has al-most not been studied systematically up to the present time. A theoreticalwork on axisymmetric bar-bar combined extrusion was presented by Yang etal. [3], who introduced the arbitrarily inclined triangular elements for velocityfield and derived the upper-bound loads on the punch, but it is only appli-cable to the final stage of the process and...

The papers using upper-bound approach to analyze the forming processesare fairly numerous [1-5, 7-12], however, bar-bar combined extrusion has al-most not been studied systematically up to the present time. A theoreticalwork on axisymmetric bar-bar combined extrusion was presented by Yang etal. [3], who introduced the arbitrarily inclined triangular elements for velocityfield and derived the upper-bound loads on the punch, but it is only appli-cable to the final stage of the process and the variety of flow patterns duringthe process is not taken into account. Without distinguishing the deformingstage, and without considering the flow pattern, the results obtained from a-nalyzing and computing the deforming process do not agree with experimentalresults in a number of cases. The problems just mentioned are believed to be solved in this paper. Theauthors' contributions are as follows: (1) The new kinematically admissible velocity fields in the early stageand the final stage are advanced. They are very close to the realistic velocityfields, and the calculated force required for deformation is more accurate. (2) Two stages and three possible flow patterns for bar-bar combinedextrusion are put forward. (3) As a result, from the proposed upper-bound formulation in this pa-per the punch pressures and the dimensions of the deformed billet can bedetermined during any process. Good correlation is found between the theoretical and experimental results.The results presented in the paper can be used for process design.

本文运用上限法分别分析了早期稳定流动阶段及后期非稳定流动阶段的杆杆型轴对称复合挤压过程。在密栅云纹及网格试验的基础上,提出了上述两个阶段的运动学容许速度场,并由此导出变形总功率消耗及平均相对单位压力,同时确定了变形程度和摩擦对单位压力的影响。本文还分析了早期速度场与后期速度场之间的转换关系以及挤压过程中可能出现的三种变形模式。如果正挤变形程度与反挤变形程度相差很大,则可能出现单向流动。在正、反挤压变形程度相等时,正挤部分挤出长度则可能稍大于反挤部分挤出长度。实验表明,理论结果与实验结果相当一致。

The bar-bar tensile impact apparatus was simplified as an axisymmetric linear elastic dynamic system containing several interfaces with physical or geometric discontinuity.Two dimensional finite-difference method and self-designed computing program BBID-Ⅱ were used to obtain the dynamic response of the system. Displacements on the interfaces with physical discontinuity were treated by a new method with two fictitious boundaries.The entire computation scheme was justified by several numerical eaamples.Especially,the...

The bar-bar tensile impact apparatus was simplified as an axisymmetric linear elastic dynamic system containing several interfaces with physical or geometric discontinuity.Two dimensional finite-difference method and self-designed computing program BBID-Ⅱ were used to obtain the dynamic response of the system. Displacements on the interfaces with physical discontinuity were treated by a new method with two fictitious boundaries.The entire computation scheme was justified by several numerical eaamples.Especially,the response of a nonhomogeneous axisymmetric rod with varying cross-section was calculated and compared with the known one-dimensional equivalent solution.According to this numerical analysis,the actual tensile impact process was simulated successfully and the validity of one-dimensional experimental principle for the bar-bar tensile impact apparatus was proved in the frame of linear elasticity.

本文对杆杆型冲击拉伸试验装置建立了简化的含有多个轴向和环向的物理和几何间断面的空间轴对称线弹性动力学系统模型,用二维有限差分法和自编的BBID-Ⅱ程序进行数值分析,并提出双虚边界法来计算物理间断面上的位移。用多种方法,特别是通过将包含内部界面的非均质变截面二维轴对称圆杆的泊松比退化为零,然后求得其差分数值解,再将此差分数值解与一维等效简化变截面非均质圆杆的解比较的方法,对有限差分方法和有限差分程序BBID-Ⅱ进行了较充分的考核。数值分析成功地模拟了弹性应力波作用下的冲击拉伸试验过程,在线弹性的框架内论证了杆杆型冲击拉伸试验装置的试验原理成立的基础和条件

 
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