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Investigation of forces acting on elements built in grain storages

100%

Szabo B., Csapo G.

Zeszyty Problemowe Postępów Nauk Rolniczych

1989

tom 378

In many cases the instruments, gages, ventilation stubs and other elements are installed in grain crop storages.The forces acting on elements of any shape can be determined theoretically in the labour-consuming manner, or sometimes they cannot be determined by any means. Conditions are different when the grain crop is moving and after a certain storing period when the material becomes aggregated. The task can be approached by means of the theory of cohesionless materials as used in the soil mechanics, too. In the course of moving, the grain crop flow can have three types of stress conditions, such as active plastic limiting state in forced movement or elastic state between the limiting states. Force ratio can be 6-8 fold for the two extremes. Theoretical investigation of the limiting states has already been made by many persons with thorough grounding. Most of them, however, delt with plane wall containers. Besides the theoretical work the measurements often give the simplified results, especially in the case with the form of certain instruments, gages, ventilation stubs. To solve the task the sample-experiments were carried out. In the experiments we built cylindrical elements in dry sand. Suspension forces were measured and recorded for various sand movement conditions. Measurements were carried out with stored and deposed sands, and in the case of discharge. Force meters, tensometers and recorders were used in the measurements. In addition to the numerical measures, the method of measuring was investigated, in the interest on future measurements in situ. According to the results, the greatest forces appear after longer storage periods.

Ograniczanie wyników

1 Zeszyty Problemowe Postępów Nauk Rolniczych

1 Csapo G.

1 Szabo B.

1 1989

Wyniki wyszukiwania

Investigation of forces acting on elements built in grain storages