Abstract

The regularities of deformation and fracture of sandstone under nonproportional biaxial and triaxial cyclic compression accompanied by the rotation of the Lamé ellipsoid and in situ continuous detection of acoustic emission are investigated experimentally on the “Triaxial Independent Loading Test System” at the Ishlinskii Institute for Problems in Mechanics, Russian Academy of Sciences. It is found that the manifestation of the Kaiser effect in the current cycle of multiaxial nonproportional compression depends on the behavior of the size, shape, and orientation of the Lamé ellipsoid with respect to the previous cycle. The Kaiser effect is observed in the case when the material has already been subjected to active loading corresponding to the set orientation of the stress ellipsoid. The degree of the specified-effect manifestation is determined by the behavior of the shape of the Lamé ellipsoid.

中文翻译：

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砂岩多轴非比例压缩下的Kaiser效应

摘要

在Ishlinskii问题研究所的“三轴独立载荷测试系统”上，通过实验研究了非比例双轴和三轴循环压缩伴随Lamé椭球旋转和原位连续检测声发射的砂岩变形和破裂规律。俄罗斯科学院力学所。已发现，在当前多轴非比例压缩循环中，Kaiser效应的表现取决于Lamé椭球相对于前一循环的大小，形状和取向。在材料已经受到对应于应力椭球设定方向的有效载荷的情况下，会观察到Kaiser效应。