In Computing, What Is Clobbering?

If several homogeneous soil tests are used as direct shear tests, each test uses a different vertical load. Then the test results of each test are plotted in the vertical stress-shear stress coordinate diagram. The curve passing through the points in the figure is called the "breaking envelope" ^[1] .

The points on the destruction envelope represent the

Add a vertical stress in the bulk material layer

, Assuming

Vertical shear stress

, when

When constant, shear stress

When increasing to the limit no longer increases, the material follows

The active surface slides. This surface is called a sliding surface (a sliding line in a bidirectional stress state). limit

versus

There is a linear relationship like Coulomb's law, so the bulk material with this relationship is called Coulomb material.

Where

Coefficient of internal friction;

Adhesion.

But there are many

versus

Bulk materials that have no linear relationship are called non-Coulomb materials. Coulomb materials are generally expressed by the following formula.

However, Farley and others believe that most bulk materials are applicable to the following formula:

In the formula, nthe index related to fluidity, when n = 1 is Coulomb material, and Tthe pure tensile strength of the bulk material layer can be obtained from the relationship in the above formula.

When sliding

Relationships are the envelopes of Mohr's circles that represent the ultimate stress state, so they are called failure envelopes (abbreviated as YL in English). This is to define the fluidity of bulk materials from the perspective of plastic mechanics.

The ultimate stress state is called the plastic equilibrium state. The above formula is true only in the early stages of sliding or crashing. The particle layer near the sliding surface expands, and the particles in the shear groove move. Usually in this state, the bulk material layer is non-isotropic. Jenike described the continuous sliding state of the bulk material layer while maintaining isotropy as "flow". The relationship at this time is shown in the figure below, passing the end point of each YL through the origin

,

... connected with Moore's destruction circle group. This straight line and

Angle of shaft

Called effective friction angle. It is an important parameter for the fluidity of bulk materials ^[2] .

Damage envelope YL and effective friction angle