Abstract
In this paper the results of experimental research are given for the stress and strain state of a near seam zone. The research is executed on large‐scale model of a zone of vertical cylindrical tank assembly connection with a geometrical imperfection. As a result, the dependence is received between values of the basic stress, which take place in a tank wall of the ideal form, and local stress, which arise in a seam zone. It is proved by experiments that when the ring stress achieves value 100 mPa, then the local stress in a near seam zone achieves the stress of 280–300 mPa. Hence, they exceed three times their major importance. These stress values are coordinated satisfactorily to the data, which are received by a theoretical way.
Highlights
Rolling-on method is often used to construct tanks in Ukraine and some other countries of CIS at present
The research is executed on large-scale model of a zone of vertical cylindrical tank assembly connection with a geometrical imperfection
The dependence is received between values of the basic stress, which take place in a tank wall of the ideal form, and local stress, which arise in a seam zone
Summary
Rolling-on method is often used to construct tanks in Ukraine and some other countries of CIS at present. An analysis of initial data has shown that even the suggested formula does not take into account all structural peculiarities of a wall in a vertical weld zone; the data obtained represent a very approximate estimate of tank cyclic durability. This technique is based on using Prandtle idealised diagram and a simplified technique for detecting a given moment of inertia of an elasticplastic strip under a double-sided yield in a joint zone. Having investigated a number of tanks, we obtained data to study values of a steel yield strength, thickness and an arrow of sinking a field weld.
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