在各向性质相同的岩石中任取一立方体，假想其中存在一个圆球体，当立方体受三向不等力作用发生均匀变形时，在不超过极限的范围内，原来的圆球体即变成三轴不等的椭球体，叫应变椭球体。
主应变的大小和方向可以表示为一个椭球体。
The magnitudes and directions of the main strain are expressed as an ellipsoid.
本文介绍了利用变形椭球体理论，对花岗岩组构(叶理、线理)进行应变分析的方法。
This paper introduces the method for a strain analysis of the fabric (foliation and lineation) of granite by using the theory of the strain ellipsoid.
测区内煤的镜质组反射率椭球体的变形特征属于拉长型应变和压扁型应变。
The ellipsoidal deformation of reflectance in the studied area was characterized by extend type or flaser type strain.
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