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In the form of crack sealing and cutting machine

Source:   Date:2014-10-28 15:46:34   Views:

In the study of fracture mechanics, the classification is based primarily crack geometric characteristics and mechanical characteristics of two ways. According to the geometric characteristics, cracks can penetrate into cracks, surface cracks, deep crack three kinds; in accordance with the mechanical characteristics can be divided into open-type crack crack, slide-open crack, tear CRACK three.
A crack (ie, the displacement of the crack along the surface normal direction tensile stress) under the action of tensile stress perpendicular to the surface of the crack, the crack opening displacement generated surface formed by: (1) crack open type (I type) . Cracks on the surface of the point of its surface and the lower surface points along the y direction of the displacement components. Not continuous.
Relative sliding at the crack plane and parallel to the shear stress and crack tip line role in the vertical direction, the crack surface along the crack surfaces generated (ie along the direction of shear stress effects) of: (2) slide-open cracks (n-type) and a crack formation. Soil surface point its crack surface and a lower surface points along the x direction displacement component "is not continuous, as shown in Figure 2 an 8b (3) tear CRACK (m-type): in parallel to the crack surface and the crack under the action of shear stress parallel to the direction of the tip of the crack produced along the crack plane surface (i.e., along the direction of action of shear stress) in the formation of a relative sliding cracks cracks on the surface of the point of its surface and a lower surface points along : displacement components' direction is not continuous.
But cracks are generally not separate a crack pattern in the actual production, which is often a combination of two or more of crack patterns, called composite cracks. In the basic form of the crack opening mode crack is relatively common, but also the most dangerous. If the packaging has a clamping device side. Then the material force only compressive stress in the high-speed precision cutting machine cut the seal, the material on the shear stress at cutting edge sealer to complete the formation of shear, the crack formed in this case is n That type of slide-open cracks.