AD ALTA
JOURNAL OF INTERDISCIPLINARY RESEARCH
Figure 13 Load case 4 - Longitudinal crossection stress, distribution on inner shell (Source: authors)
The obtained values of the maximum stress and the calculated
safety factor are given in Table 6. Coefficient of safety once
again does not fall below the permissible value of 1.5, thus
solved state can be considered suitable.
Part
Equivalent von
Misses stress [MPa]
Safety factor
Inner shell
232,67
1,63
Outer shell
131,4
1,56
Table 6 Load case 4, comparison of calculated values and
allowed values (Source: authors)
6 Conclusion
In all four load states areas with maximum stress were created in
identical locations, in the case of outer shell as in the case of
inner shell. In the outer shell, it was on the front face; the stress
concentrator could be removed using a different type of knob
block. Inner shell has stress concentrator always occur in the
area of the filler neck. With given dimensions of the LNG tanks
is in the construction this area the most loaded part and it is
considered as the most critical point. In the future, it would be
appropriate to optimize the area of filler neck, which means
improved strength conditions while maintaining the smallest
possible thermal transmittance. According to IMO: For each
load, for portable tanks, the safety coefficient for metals having a
clearly defined yield point should be 1.5 in relation to the
determined yield stress. Every case of load suits to standard in
computation of this volume (Table 3-6).
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