In this paper, the mechanism of stress cracks and the corn stress and strain during vacuum drying were analyzed. The stress within corn grain was simulated. Simulation results show the peak maximum stress difference inside and outside the corn grain has been reduced with the drying
time increases, but the inner peak maximum stress will be increased; the change of drying time has no significant impact on the distribution of the maximum stress; the higher the vacuum, the smaller the peak stress in the grain center. During the vacuum drying, a tempering process was added,
the moisture in the central part of the corn grain gradually spread to the surface. During the tempering process, the moisture content of corn stable, thereby the moisture gradient inside the corn grain and the internal stress were reduced.
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