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跨厚比
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  span to depth ratio
     WT5BZ]Flexural properties of C/C composites was investigated at the temperature of 20℃ to 1400℃ It′s found that as the span to depth ratio increases, the bending strength rises but the shear strength reduces When the span to depth ratio is greater than 8, the bending strength tend to be constants The span to depth ratio is independent on temperature in the range of 20℃ to 1400℃
     结果表明 ,在室温下随着跨厚比的增加 ,C/C复合材料层合板的弯曲强度亦增加 ,而剪应力却逐步下降 ; 但当跨厚比≥ 8时 ,C/C复合材料层合板的弯曲强度不再增加 ,剪应力下降逐渐减缓并保持一恒定值 ;
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  “跨厚比”译为未确定词的双语例句
     According to Timoshenko-Mindlin theory of thick plates, strain energy equivalence hypotheses and Boltzmann superposition principle, the nonlinear dynamic equations of viscoelastic laminated plates including the effects of damage and transverse shear deformation are given.
     在数值计算中,粘弹性材料取为标准线性固体,基于Kachanov损伤演化模型,讨论了不同跨厚比、长宽比和边界条件对损伤粘弹性层合中厚板的非线性自由振动幅频响应曲线的影响,以及横向剪切变形和材料参数对损伤粘弹性复合材料层合中厚板的非线性自由振动基频的影响,并与有关文献的结果进行了比较。
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     the ratio between roadway’s span and thickness is the most important factor of critical stress.
     跨厚比是影响临界应力的最重要的因素。
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     The dependence of the measuring conditions for smallsample on the bending strength is discussed and therepeatability of the bending strength obtained bythis method is examined.
     探讨了小试样测试技术条件如跨厚比、应变速率(试验速度)与试样弯曲强度之间的依赖关系。 作为一种材料力学试验方法,考核了小试样弯曲试验强度结果的重复性。
短句来源
     The calcvlatedresults show that when the ratios betweenthe thickness and height are larger than5~8 the thin plate theory has certainaccuracy, but there is a large amount oferror in the solutions by thin plate theoryfor parts with smaller ratios such as gears.
     计算结果表明,当跨厚比大于5~8时,薄板理论有一定的精度,但对于轮齿这类跨厚比较小的机械零件,薄板理论有很大误差。
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     Effects of test pieces' size of bamboo composite board (the ratio of width to thickness and the ratio of test span to thickness) on the test values of MOR and MOE were studied by quadratic orthogonal rotational combination design test.
     采用二次正交旋转组合设计试验,研究了竹材复合板静曲试件的宽厚比、跨厚比对静曲强度及弹性模量测试值的影响。
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     the ratio between roadway’s span and thickness is the most important factor of critical stress.
     厚比是影响临界应力的最重要的因素。
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     界书写
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  span to depth ratio
Furthermore it is shown that the magnitude of shear deflection depends on both the span to depth ratio of the beam and the elastic properties of the species involved.
      
It increases as the effective span to depth ratio of the composite beam decreases and as the core ratio of pure modulus of elasticity to modulus of rigidity increases.
      
Approximate analytical expressions for the second, third, fourth and fifth terms for a TPB with a span to depth ratio of 4 and for a single edge notched beam subjected to pure bending are obtained by fitting the computed data.
      
These approximations are then used to predict the general expressions for coefficients of the higher order terms of a TPB with arbitrary span to depth ratio β.
      
The specimens were of square cross section with a span to depth ratio of 2/5.
      
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Transverse shear effects are important for the bending and vibration of laminated plates. When a laminate is in bending, it is assumed in this paper that the transverse displacement is constant through the plate thickness, and the in-plane displacements vary linearly through each layer, i.e., they are piecewise linear through the plate thickness. The latter means that the transverse shear strains within each layer area assumed to be different each other. There are two methods to relate the transverse shear strains...

Transverse shear effects are important for the bending and vibration of laminated plates. When a laminate is in bending, it is assumed in this paper that the transverse displacement is constant through the plate thickness, and the in-plane displacements vary linearly through each layer, i.e., they are piecewise linear through the plate thickness. The latter means that the transverse shear strains within each layer area assumed to be different each other. There are two methods to relate the transverse shear strains within each layer:(1) Demand the continuity of two shear stress components at all inteifaces. It is equivalent to that transverse shear stresses are constant respectively through the plate thickness.(2) Assume that transverse shear stresses vary parabolically through the plate thickness. These two methods correspond with two models of the displacements of the laminate, called Piecewise (1) and Piecewise (2) schemes respectively in this paper. According to these two schemes, the governing equations for the bending of a specially Orthotiopic laminate under a lateral load are obtained on the basis of the principle of minimum potential energy. The unknown functions are Wom,ψxo and ψyo which are the transverse displacement and rotational angles of normals to the central layer of the laminate respectively. After Wom,ψxo and ψyo have been solved the in-plane displacements and stresses within each layer can be further obtained. Thereafter the transverse shear stresses can be given by integrating the equilibrium equations in elasticity. As for vibration problems, the similar governing equations and the boundary conditions of the laminate are derived from Hamilton's principle. Three examples are calculated. They indicate that a good estimate of displacements, stresses and natural frequencies of laminates can be given in accordance with the two schemes in this paper, even though the span-to-depth ratios of laminates are small. When a laminate is consisted of a large number of layers, the results calculated according to Piecewise(2) scheme may be bettter.

横向剪切变形对复合材料层合板弯曲与振动的影响甚大。在本文的近似分析中,假定板在弯曲时横向位移沿整个板厚为常量。横向剪切应变沿各层厚度方向也分别为常量,但各层不同。文中以特殊正交各向异性层合板为例,采用两种不同的方法建立了各层剪切应变间的关系,推演了层合板横向弯曲与振动的微分方程组及边界条件。算例表明,即使层合板的跨——厚比很小,用本文两种分析方案计算位移、应力及固有频率,都仍具有较高的精度。

The comparable ratio of the bending strengthbetween plastics big and small samples is studied.The dependence of the measuring conditions for smallsample on the bending strength is discussed and therepeatability of the bending strength obtained bythis method is examined.

本文研究了塑料材料大、小试样弯曲强度值之间的可比性。阐明了GB1042—79国家标准试验方法中的二种试样尺寸所测得数据之间的关系及其适用性。探讨了小试样测试技术条件如跨厚比、应变速率(试验速度)与试样弯曲强度之间的依赖关系。作为一种材料力学试验方法,考核了小试样弯曲试验强度结果的重复性。

Basing on the simplifiedRessner's Equations of thick elastic plate,this paper deals with the problem of ben-ding strengsh of gear tooth through ana-lysing the bending problems of a thick canti-lever-plate of infinite length and a halfspace protrusion thick plate. The calcvlatedresults show that when the ratios betweenthe thickness and height are larger than5~8 the thin plate theory has certainaccuracy, but there is a large amount oferror in the solutions by thin plate theoryfor parts with smaller ratios such...

Basing on the simplifiedRessner's Equations of thick elastic plate,this paper deals with the problem of ben-ding strengsh of gear tooth through ana-lysing the bending problems of a thick canti-lever-plate of infinite length and a halfspace protrusion thick plate. The calcvlatedresults show that when the ratios betweenthe thickness and height are larger than5~8 the thin plate theory has certainaccuracy, but there is a large amount oferror in the solutions by thin plate theoryfor parts with smaller ratios such as gears.

本文以Reissner简化理论为基础,进行了无限长悬臂厚板与半空间体外伸厚板的力学分析,这种模型较为符合轮齿的实际情况。计算结果表明,当跨厚比大于5~8时,薄板理论有一定的精度,但对于轮齿这类跨厚比较小的机械零件,薄板理论有很大误差。

 
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