Abstract
A stress relief groove is introduced in the R area and the stress is analyzed using a finite element method (FEM). Then the relief of the stress concentration in the vicinity of the pressure vessel is measured based on these results. When designing a stress relief groove, the lever must overhang the groove (L > 0). By introducing a stress relief groove to the R area, maximum stress on the lever guide can be reduced by 10%. This enables the reduction of the maximum stress (Mises stress) to be less than the fatigue strength. Furthermore, the location where maximum stress occurs on the lever guide changes in accordance with the clearance between the lever and lever guide. This identified the need to take into account the deviation factor such as design clearance in modeling process.
Highlights
From the late 1980s, in preparation for the utilization of high-pressure processing in the Japanese domestic food industry, high-pressure processing was first utilized in the commercialization of jam and fruit juice drinks
By introducing a stress relief groove to the R area, maximum stress on the lever guide can be reduced by 10%
This enables the reduction of the maximum stress (Mises stress) to be less than the fatigue strength
Summary
From the late 1980s, in preparation for the utilization of high-pressure processing in the Japanese domestic food industry, high-pressure processing was first utilized in the commercialization of jam and fruit juice drinks. With the conventional seal mechanism for ultra-high pressure equipment, a push-type structure for the cover, similar to that for a press, was used [1]. When this method is used, the structure of the vessel and lid is simple, and the structure is able to withstand ultra-high pressure. In the upper part of the vessel, the lever is inserted into the lever guide that has been processed using a wire cut (EDM) Using this structure, a concentration of stress [2] occurs in the vicinity of the area R because of the contact between the lever and lever guide.
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