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Fine 2D model
Stress lines 1–7 kN/cm
2
with step 0.1
Model 0
Model 1
Figure 35. Analysis of fractured tooth, stresses 0–37 kN/cm
2
with step 3,
zones which have to be without cracks
Table 14. Percentual distribution of stress and deformation energy
Stress
Zones of the tooth
Normal Shearing
Deformation
energy
Bottom of the tooth
21
11
42
First zone from the side of the tooth,
width 1 cm and height 1.5 cm
31
13
49
Second zone,
width 5 mm and height 14 mm
9
5
6
Third zone,
width 5 mm and height 0 mm
4
2
2
Middle of the tooth-triangle with base
of 26 and height 28
3
1
1
Total
68
32
100
Figure 36. Fine 2D model of five teeth, stress lines 1–7 kN/cm
2
, step 0.1,
zones which have to be without cracks (right)
3.14. Recovery and reconstruction of excavator SchRs800 O&K structure
Substructures of the excavator SchRs800 O&K, operating in power plant Kostolac
Drmno are consisted of: longitudinal shaped plates of the upper platform between top and
bottom platform plate; cross plates and upper platform diaphragm between top and
bottom plate of the upper platform; cylinder on the radial-axial bearing point; bottom
platform plate; top platform plate; “П” column.
It has been proposed to recover and reconstruct the substructure in the following way:
add around the existing cylinder a new one with diameter of 15 mm at distance of 25 mm
from the old one and 240° around the periphery; to fit the curve beam of 40
×
80 mm
cross-section on old cylinder external side and under the new one around the upper and
lower cylinder perimeter and at a given angle; to reinforce part of longitudinal vertical
external and internal plates to both pillar sides (thickness 15 mm) with additional plates
15 mm thick, and the diaphragm between pillar parts and cylinder with additional plates
15 mm thick; to add two diaphragms between the front vertical plate (connection with
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