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   equivalent ellipse 在 地质学 分类中 的翻译结果: 查询用时:0.048秒
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equivalent ellipse
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  equivalent ellipse
Based on threshold value of ΔK below which crack propagation ceases, the critical value of loading stress was determined for different shapes and sizes of pores using an equivalent ellipse concept.
      
Finally, as an engineering application, we provide an accurate formula for the evaluation of the Notch Stress Intensity Factors of a crack, mainly subjected to tensile stress, from the peak stress of the equivalent ellipse under the same loading.
      
The method makes use of elliptic displacement functions which are satisfied by the introduction of an "equivalent ellipse" obtained through first simulating the actual crack surface displacements as a part of a parabola or a hyperbola.
      
A new modified circular microstrip antenna with circular polarization is researched in this paper and a new method named for equivalent ellipse is proposed by authors to calculate the patterns, axial ratio and partial power gain.
      
The equivalent ellipse has the same major and minor axes as the particle, but has no angularity.
      


Finite strain analysis is an important technique of the modern structural geology.This paper presented one new method to describe the arbitrary grains by using the inertia moment ellipses.Based on the theory of inertia moment ellipsoid,the inertia moment ellipses of the arbitrary mineral grains in the rock slice were calculated.Because of the invariable area of the grains,the parameters of these ellipses were normalized.Then the equivalent ellipses corresponding to the moment ellipses...

Finite strain analysis is an important technique of the modern structural geology.This paper presented one new method to describe the arbitrary grains by using the inertia moment ellipses.Based on the theory of inertia moment ellipsoid,the inertia moment ellipses of the arbitrary mineral grains in the rock slice were calculated.Because of the invariable area of the grains,the parameters of these ellipses were normalized.Then the equivalent ellipses corresponding to the moment ellipses were obtained.The equivalent ellipses reflect the preferred orientations and the deformation features.While the finite strain of the deformed rock was gained by the statistical analysis on the equivalent ellipses present in the parameters form of matrix.This new method is very effective and applicabile,especially when the amount of the grains is not sufficient or the distribution is not well proportioned.The analysis process is very convenient by using the computers programs.

提出了利用惯量椭圆对任意形状矿物颗粒进行描述的方法,并利用惯量椭圆理论,计算了岩石薄片中任意形状矿物颗粒的惯量椭圆,通过颗粒面积对椭圆参数进行标准化,得到每一矿物颗粒的等效应变椭圆。等效应变椭圆能够有效地反映对应矿物颗粒的优选方位以及变形特征,进而利用椭圆的矩阵参数形式对等效应变椭圆进行统计分析,获得岩石的有限应变椭圆;同时给出了相应的数值计算方法,编制了软件Straindesk,并得到了成功的应用。该方法克服了先前应变测量中的局限性,方便实现计算机的自动分析,具有较强的有效性和广泛的适用性。

 
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